Eurocontrol. Спецификация для обмена данными наблюдения

EUROCONTROL Спецификация для
Обмена Данными Наблюдения
ASTERIX Часть 9 Категория 062 SDPS Отслеживание сообщений
ИДЕНТИФИКАТОР ДОКУМЕНТА: EUROCONTROL-SPEC-0149-9
Версия :
Дата Выпуска :
Стадия :
Предназначен для :
Категория :
1.19
11/12/2020
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Общий Доступ Спецификация EUROCONTROL

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ХАРАКТЕРИСТИКИ ДОКУМЕНТА
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УТВЕЖДЕНИЕ ДОКУМЕНТА
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Этот документ был одобрен Группой Технического Обслуживания ASTERIX (AMG)
Для утверждения руководством полного комплекта документации ASTERIX см. Часть 1

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ИСТОРИЯ ИЗМЕНЕНИЙ ДОУМЕНТА
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В следующей таблице записана полная история последующих изданий настоящего документа.

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Publications EUROCONTROL Headquarters 96 Rue de la Fusée
B-1130 BRUSSELS
Tel: [phone]
Fax: [phone]
E-mail:
[email protected]

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СОДЕРЖАНИЕ
ХАРАКТЕРИСТИКА ДОКУМЕНТА.........................................................................................i
УТВЕРЖДЕНИЕ ДОКУМЕНТА..............................................................................................iii
ИСТОРИЯ ИЗМЕНЕНИЯ ДОКУМЕНТА................................................................................iv
1. ВВЕДЕНИЕ.......................................................................................................1
1.1 Область применения.................................................................................................1
2. Рекомендации................................................................................................2
2.1 Общие сведения........................................................................................................2
2.2 Справочные документы..........................................................................................2
3. Определения, Сокращения и Аббревиатуры..........................................3
3.1 Определения.............................................................................................................3
3.2 Сокращения и Аббревиатуры................................................................................4
4. ОБЩИЕ ПРИНЦИПЫ.....................................................................................6
4.1 Общие.........................................................................................................................6
4.2 Тайм менеджмент.....................................................................................................6
4.3 Системы Проекций и Географические Координаты..........................................6
4.3.1 Измеренное положение.............................................................................................6
4.3.2 Рассчитанная позиция...............................................................................................6
4.4 Обязательные пункты.............................................................................................6
4.5 Неиспользуемые биты в элементах данных......................................................6
4.6 Профиль приложения пользователя и блоки данных.......................................7
4.7 Состав сообщений...................................................................................................7
4.8 Элементы данных, зависящие от реализации......................................................7
5. СТРУКТУРА ОТЧЕТОВ..................................................................................8
5.1 Стандартные Элементы Данных...........................................................................8
5.2 Описание стандартных элементов данных.........................................................9
5.2.1 Элемент данных I062/010, Идентификатор источника Данных................................9
5.2.2 Элемент данных I062/015, Идентификация службы..................................................9
5.2.3 Элемент данных I062/040, Номер трека..................................................................10
5.2.4 Элемент данных I062/060, Режим трека 3/A Code...................................................10
5.2.5 Элемент данных I062/070, Информация о времени слежения.............................11
5.2.6 Элемент данных I062/080, Статус трека................................................................12
5.2.7 Элемент данных I062/100, Расчётная позиция трека (Cartesian) ........................21
5.2.8 Элемент данных I062/105, Расчётная позиция трека (WGS-84)...........................22
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5.2.9 Элемент данных I062/110, Отчеты о данных режима 5 и расш. код режима 1.........23
5.2.10 Элемент данных I062/120, Режим трека 2 Код........................................................33
5.2.11 Элемент данных I062/130, Расчетная геометрическая высота трека.................34
5.2.12 Элемент данных I062/135, Расчетная барометрическая высота трека...............35
5.2.13 Элемент данных I062/136, Измеренная высота полета.........................................36
5.2.14 Элемент данных I062/185, Рассчитанная скорость трека(Cartesian)......................37
5.2.15 Элемент данных I062/200, Режим движения..........................................................38
5.2.16 Элемент данных I062/210, Расчётное ускорение (Cartesian) ..............................39
5.2.17 Элемент данных I062/220, Расчётная скорость подъема/спуска..........................40
5.2.18 Элемент данных I062/245, Идентификация цели.....................................................41
5.2.19 Элемент данных I062/270, Размер и ориентация цели..........................................43
5.2.20 Элемент данных I062/290, Период обновления системного трека........................45
5.2.21 Элемент данных I062/295, Отслеживание периода данных.................................52
5.2.22 Элемент данных I062/300, Идентификация парка транспортных средств...........69
5.2.23 Элемент данных I062/340, Измеренные данные....................................................70
5.2.24 Элемент данных I062/380, Данные полученные с самолета................................75
5.2.25 Элемент данных I062/390, Данные связанные с планом полета.......................100
5.2.26 Элемент данных I062/500, Оценочная точность..................................................118
5.2.27 Элемент данных I062/510, Составленный трек-номер.....................................124
5.3 Передача сообщений отчета о прогнозе обслуживания.................................126
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ВВЕДЕНИЕ
1.1 Область применения
1.1.1 В этом документе описывается структура сообщений для передачи через Систему Отслеживания данных для пользователя.
1.1.2 В настоящем документе определены данные из категории 062.

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РЕКОМЕНДАЦИИ
2.1 Общие сведения
Следующие документы и стандарты содержат положения, которые, посредством ссылок в этом тексте, представляют собой положения документации EUROCONTROL.
На момент публикации данной документации EUROCONTROL, редакции, указанные для справочных документов и стандартов, были действительны.
Любое изменение указанных документов ИКАО должны быть немедленно приняты во внимание при пересмотре документации EUROCONTROL.
Изменения других документов не должны входить в положения настоящей документации EUROCONTROL, пока они не будут официально рассмотрены и включены в настоящую документацию EUROCONTROL.
В случае противоречий между требованиями настоящей документации EUROCONTROL и содержанием других документов, на которые имеются ссылки, эта документация EUROCONTROL имеет приоритет.
2.2 Справочные документы
Спецификация EUROCONTROL SPEC-0149, версия 2.4, 24 октября 2016 “Спецификация EUROCONTROL для обмена данными наблюдения – часть 1 многоцелевой структурированный обмен информацией наблюдения EUROCONTROL – ASTERIX”.
Приложение 10 ICAO, Том. IV
Документ ICAO 4444
Приложение 14 ICAO

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ОПРЕДЕЛЕНИЯ, СОКРАЩЕНИЯ И АББРЕВИАТУРЫ
3.1 Определения
В настоящем документе EUROCONTROL, применены следующие термины с соответствующими определениями:

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3.2. Сокращения и аббревиатуры
В настоящем стандарте EUROCONTROL применены следующие обозначения и сокращения:
Градус (угол)
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ОБЩИЕ ПРИНЦИПЫ
4.1
Общие
Передача данных системного слежения требует передачи одного типа сообщений, т.е. донесений о цели и данных плана полета.
4.2
Тайм менеджмент
Временная маркировка должна соответствовать приложению 5 ИКАО
4.3
Системы проекций и географические координаты
4.3.1
Измеренное положение
Измеренное положение передается с поправкой на смещение.
4.3.2
Рассчитанная позиция
Если экспортируемое расчетное положение выражено в двухмерной декартовой системе координат, выполняется проекция на плоскость, касательную к эллипсоиду WGS-84 в месте расположения опорной точки. Ось Y указывает на географический север в этом месте. Ось X перпендикулярна оси Y и направлена на восток. Координаты X, Y рассчитываются с использованием метода проекции, подходящего для окончательного преобразования 3D в 2D (например, стереографическая проекция). Она корректируется по наклонной дальности, источник высоты указан в I062/080 Track Status, Octet 1, бит 6 (MRH). Если этот бит указывает на "Geometric Altitude more reliable", источник информации для расчета Geometric Altitude указывается в I062/080 Track Status, Octet 1, bits-5/3 (SRC).
4.4
Обязательные пункты
Правила кодирования содержатся в таблице 1 в главе 5.1 и в каждом элементе данных.
4.5
Неиспользуемые биты в элементах данных
Декодеры данных ASTERIX никогда не должны предполагать и полагаться на конкретные настройки запасных или неиспользуемых битов. Однако для улучшения читаемости двоичных дампов записей ASTERIX рекомендуется установить все свободные биты в ноль.

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Профиль приложения пользователя и блоки данных
Определен единый профиль приложения пользователя (UAP), который должен использоваться для сообщений данных системного трека.
Блоки данных должны иметь следующую структуру.
где:
Категория данных (CAT) = 062, представляет собой одно октетное поле, указывающее, что блок данных содержит данные системного трека;
Индикатор длины (LEN) - двух октетное поле, указывающее общую длину в октетах блока данных, включая поля CAT и LEN;
FSPEC - это спецификация поля.
4.7
Состав сообщений
Сообщения должны состоять из элементов данных, собранных в порядке, определенном справочным номером поля (FRN) в соответствующем UAP.
При отправке элементы всегда должны передаваться в Записи с соответствующими битами FSPEC, установленными на единицу.
4.8
Элементы данных, зависящие от реализации
Для предотвращения неоднозначности интерпретации, содержание и кодировка элементов данных определяется как можно точнее. Однако существуют условия, которые не допускают такого строгого определения и в которых могут быть различия в реализации в зависимости от системы. Такой элемент данных будет помечен в примечании как "зависящий от реализации". Точное значение элемента данных должно быть описано в документе управления интерфейсом (ICD) соответствующей системы. В этом случае положения ICD будут отражать фактическую реализацию элемента данных. В данной спецификации следующие элементы данных отмечены как "зависящие от реализации":I062/080 (Статус трека), пятое расширение, бит-5 (SFC) I062/340 (Измеренная информация)

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СТРУКТУРА ОТЧЕТОВ
5.1
Стандартные элементы данных
Стандартизированные элементы данных, которые должны использоваться для передачи данных системного трека, определены в таблице 1 и описаны на следующих страницах. В колонке "Правило кодировки" указано, какие элементы являются обязательными (О) или необязательными (Н) в записи ASTERIX Cat 062.
Таблица 1 - Элементы данных категории 062

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Описание стандартных элементов данных
5.2.1
Элемент данных I062/010, Идентификатор источника данных
Определение : Формат : Структура:
Идентификация системы, отправляющей данные
Два октета элемента данных фиксированной длины
Октет №1
Октет №2
ПРИМЕЧАНИЕ -
Актуальный список SAC публикуется на веб-сайте EUROCONTROL (http://www.eurocontrol.int/asterix).
Правило кодировки :
Этот элемент должен присутствовать в каждой записи ASTERIX
5.2.2
Элемент данных I062/015, Идентификация службы
Определение :
Формат : Структура:
Идентификация услуги, предоставляемой одному или нескольким пользователям.
Одно октетный элемент данных фиксированной длины.
Октет №1
bits8/1 Идентификация службы
идентификатор услуги присваивается системой
ПРИМЕЧАНИЕ -
Правило кодировки :
Этот элемент является необязательным

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Элемент данных I062/040, Номер трека
Определение : Формат : Структура:
Идентификация трека
Два октета элемента данных фиксированной длины
Октет №1
Октет №2
bits 16/1
Правило кодировки :
Номер трека
Этот элемент должен присутствовать в каждой записи ASTERIX
5.2.4
Элемент данных I062/060, Режим слежения 3/А Код
Определение : Формат : Структура:
Код Mode-3/A, преобразованный в восьмеричное представление. Два октета элемента данных фиксированной длины
Октет №1
Октет №2
bit-13 bits-12/1
Запасные биты установлены в 0
Ответ в режиме 3/A в восьмеричном представлении
Правило кодировки :
Этот элемент является необязательным

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Элемент данных I062/070, Информация о времени слежения
Определение :
Отметка абсолютного времени информации, представленной в сообщении трека, в виде прошедшего времени с последней полуночи, выраженного в формате UTC.
Трех октетный элемент данных фиксированной длины.
Формат : Структура:
Октет №1
Октет №2
Октет №3
bit-16
(LSB)
=
2-7 s
= 1/128 s
ПРИМЕЧАНИЕ
Это время состояния вектора трека.
Время обнуляется в каждую полночь.
Правило кодировки :
Этот элемент должен присутствовать в каждой записи ASTERIX

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Элемент данных I062/080, Статус трека
Определение : Формат :
Статус трека.
Элемент данных переменной длины, состоящий из первой части в один октет, за которой при необходимости следуют продолжения в 1-октет.
Структура:
Октет №1
Правило кодировки :
Этот элемент должен присутствовать в каждой записи ASTERIX.
ПРИМЕЧАНИЕ -
I062/080 (SRC) может быть отправлен независимо от наличия или отсутствия элемента данных I062/130.

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ПРИМЕЧАНИЕ -
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Если I062/080 (MRH) указывает "Барометрическая высота (Режим C) более надежный", и передается расчетная высота, она должна передаваться с помощью элемента данных I062/135 "Расчетная барометрическая высота трека".
Если I062/080 (MRH) указывает "Геометрическая высота более надежна", и передается рассчитанная высота, она должна быть передана с помощью элемента данных I062/130 "Рассчитанная геометрическая высота трека". В этом случае источник для I062/130 указывается I062/080 (SRC).
Элементы данных I062/130, I062/135 и I062/136 могут передаваться параллельно при наличии соответствующей информации. Это не зависит от значения, передаваемого в I062/080 (MRH).
ПРИМЕЧАНИЕ -
ПРИМЕЧАНИЕ -

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I062/080 Статус трека
Структура первого экстента:
Октет №1
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I062/080 Статус трека
Структура второго экстента :
Октет №1
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I062/080 Статус трека
Структура третьего экстента :
Октет №1
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Тип трека и движения также могут быть получены из I062/290 Период обновления системного трека
Если система поддерживает технологию, то значение по умолчанию (0) означает, что технология была использована для создания отчета
Если система не поддерживает данную технологию, то значение по умолчанию не имеет смысла.

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I062/080 Статус трека
Структура четвертого экстента:
Октет №1
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bits-8/7
(SDS)
Статус данных наблюдения
= 00 Объединенный
= 01 Только совместный
= 10 Только несовместный
= 11 Не определен
bits-6/4
(EMS)
Индикация аварийного статуса
ПРИМЕЧАНИЕ -
Bits-6/4 (EMS): кроме подполя #11 элемента данных I062/380, эти биты позволяют SDPS установить аварийную индикацию, полученную из других источников, кроме АЗН-В (например, на основе кода Mode 3/A).
Bit-3 (PFT): с помощью этого SDPS может указать, что внутренняя обработка указывает на то, что трек является потенциально ложным. Подробности внутренней обработки зависят от системы. Для повышения безопасности целей, предоставляемых АЗН-В, в наземной области АЗН-В были разработаны многочисленные функции проверок. Если какая-либо из этих функций покажет потенциально ложную цель, бит PFT будет использоваться для передачи этой информации в CWP. Если и как эта информация обрабатывается и отображается на CWP, то это вопрос местного значения и не является предметом спецификации категории 062.
ПРИМЕЧАНИЕ -

System Track Messages
EUROCONTROL-SPEC-0149-9
ПРИМЕЧАНИЕ -
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Bit 2 (FPLT): этот бит - если он установлен - указывает на то, что информация, содержащаяся в отчете о цели, была обновлена данными, связанными с планом полета, поскольку данные наблюдения за целью отсутствовали, или были созданы на основе данных, связанных с планом полета в районах, где наблюдение отсутствует.

System Track Messages
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I062/080 Статус трека
Структура пятого экстента :
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Bit 8 (DUPT) устанавливается в 1, если корреляция между отчетом о цели и планом полета невозможна, поскольку код режима 3/A, указанный в плане полета, встречается в данных наблюдения более одного раза.
Bit 7 (DUPF) устанавливается в 1, когда для конкретной цели наблюдения существует более одного плана полета, что делает корреляцию невозможной.
Bit 6 (DUPM) установлен в 1, если цель была соотнесена вручную, но также существует обычный план полета.
Все треки, для которых bits 8, 7 или 6 установлены в 1, отмечены на CWP.
Bit 5 (SFC) установлен в 1, когда SDPS считает, что цель находится на поверхности (фактическое значение зависит от реализации - см. главу 4.8. выше)

System Track Messages
EUROCONTROL-SPEC-0149-9
Bit 4 (IDD) устанавливается в 1, если идентификатор рейса присутствует в зоне наблюдения более одного раза.
Bit 3 (IEC) устанавливается в 1, если сравнение между различными источниками выявило несоответствие в информации, содержащейся о кодах аварийных ситуаций.
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5.2.7
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Элемент данных I062/100, Расчетная позиция трека. (Cartesian)
Определение :
Расчетная позиция в декартовых координатах с разрешением 0,5 м, в форме двух дополнений.
Шести октетный элемент данных фиксированной длины.
Формат : Структура:
Октет №1
Октет №2
Октет №3
Октет №4
Октет №5
Октет №6
Правило кодировки:
Этот элемент является необязательным

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5.2.8
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Элемент данных I062/105, Расчетная позиция в координатах WGS-84
Определение :
Расчетная позиция в координатах WGS-84 с разрешением 180/225 градусов.
Восьми октетный элемент данных фиксированной длины.
Формат : Структура:
Октет №1
Октет №2
Октет №3
Октет №4
Октет №5
Октет №6
Октет №7
Октет №8
ПРИМЕЧАНИЕ - LSB обеспечивает разрешение по крайней мере лучше, чем 0,6 м.
Правило кодировки:
Этот элемент является необязательным

System Track Messages
EUROCONTROL-SPEC-0149-9
5.2.9
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Элемент данных I062/110, Отчеты о данных режима 5 и расширенный код режима 1
Определение : Формат :
Отчеты о данных режима 5 и расширенный код режима 1
Составной элемент данных, состоящий из основного подполя в один октет, за которым следуют указанные подполя.
Структура первичного подполя :
Октет №1
bit-7
(PMN)
Subfield #2: Mode 5 PIN/ National
Origin/Mission Code
= 0
= 1
Absence of Subfield # 2 Presence of Subfield #2
bit-6
(POS)
Subfield #3: Mode 5 Reported Position
= 0
= 1
Absence of Subfield #3 Presence of Subfield #3
bit-5
(GA)
Subfield #4: Mode 5 GNSS-derived Altitude
= 0
= 1
Absence of Subfield #4 Presence of Subfield #4
bit-4
(EM1)
Subfield #5: Extended Mode 1 Code in Octal Representation
= 0
= 1
Absence of Subfield #5 Presence of Subfield #5
bit-3
(TOS)
Subfield #6: Time Offset for POS and GA.
= 0
= 1
Absence of Subfield #6 Presence of Subfield #6

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bit-1
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(FX)
Extension Indicator no extension extension
= 0
= 1
Правило кодировки :
Этот элемент является необязательным

System Track Messages
EUROCONTROL-SPEC-0149-9
Item I062/110 Mode 5 Data reports & Extended Mode 1 Code
Structure of Subfield #1: Mode 5 Summary:
Octet no. 1
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bit-1
(X) X-pulse from Mode 5 Data reply or Report.
= 0 X-pulse set to zero or no
authenticated Data reply or Report received.
= 1 X-pulse set to one.
NOTES
1. The flags M2, M3, MC refer to the contents of data items I062/120, I062/060 and I062/135 respectively. The flag M1 refers to the contents of the Subfield

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#5 (Extended Mode 1 Code in Octal Representation).
If an authenticated Mode 5 reply is received with the Emergency bit set, then the Military Emergency bit (ME) in Data Item I062/080, Track Status, shall be set.
If an authenticated Mode 5 reply is received with the Identification of Position bit set, then the Special Position Identification bit (SPI) in Data Item I062/080, Track Status, shall be set.
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Item I062/110 Mode 5 Data reports & Extended Mode 1 Code
Structure of Subfield #2:
Mode 5 PIN /National Origin/ Mission Code
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Octet no. 1
Octet no. 2
Octet no. 3
Octet no. 4

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Item I062/110 Mode 5 Data reports & Extended Mode 1 Code
Structure of Subfield #3: Mode 5 Reported Position
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Octet no. 1
Octet no. 2
Octet no. 3
Octet no. 4
Octet no. 5
Octet no. 6
NOTE -
The resolution implied by the LSB is better than the resolution with which Mode 5 position reports are transmitted from aircraft transponders using currently defined formats.

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Item I062/110 Mode 5 Data reports & Extended Mode 1 Code
Structure of Subfield #4:
Mode 5 GNSS-derived Altitude
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Octet no. 1
Octet no. 2
GA is coded as a 14-bit two’s complement binary number with an LSB of 25 ft. irrespective of the setting of RES.
The minimum value of GA that can be reported is -1000 ft.

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Item I062/110 Mode 5 Data reports & Extended Mode 1 Code
Structure of Subfield #5:
Extended Mode 1 Code in Octal Representation
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Octet 1
Octet 2
bit 16/13
Spare bits set to 0
bits-12/1
(EM1)
Extended Mode 1 Code in octal representation
NOTE -
If Subfield #1 is present, the M1 bit in Subfield #1 indicates whether the Extended Mode 1 Code is from a Mode 5 reply or a Mode 1 reply. If Subfield #1 is not present, the Extended Mode 1 Code is from a Mode 1 reply.

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Item I062/110 Mode 5 Data reports & Extended Mode 1 Code
Structure of Subfield #6:
Time Offset for POS and GA
Octet no. 1
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bits-8/1
(TOS)
Time Offset coded as a twos complement number with an LSB of 1/128 s. The time at which the Mode 5 Reported Position (Subfield #3) and Mode 5 GNSS-derived Altitude (Subfield #4) are valid is given by Time of Day (I048/140) plus Time Offset.
Note:
TOS shall be assumed to be zero if Subfield #6 is not present.

System Track Messages
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Item I062/110 Mode 5 Data reports & Extended Mode 1 Code
Structure of Subfield #7:
X Pulse Presence
Octet no. 1
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bits-8/6
spare bits set to zero
bit-5
(X5)
X-pulse from Mode 5 Data reply or Report.
= 0 X-pulse set to zero or no authenticated Data reply or Report received.
= 1 X-pulse set to one (present).
bit-4
(XC)
X-pulse from Mode C reply
= 0 X-pulse set to zero or no Mode C reply
= 1 X-pulse set to one (present)
bit-3
(X3)
X-pulse from Mode 3/A reply
= 0 X-pulse set to zero or no Mode 3/A reply
= 1 X-pulse set to one (present)
bit-2
(X2)
X-pulse from Mode 2 reply
= 0 X-pulse set to zero or no Mode 2 reply
= 1 X-pulse set to one (present)
bit-1
(X1)
X-pulse from Mode 1 reply
= 0 X-pulse set to zero or no Mode 1 reply
= 1 X-pulse set to one (present)

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5.2.10
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Data Item I062/120, Track Mode 2 Code
Definition : Format : Structure:
Mode 2 code associated to the track Two-Octet fixed length data item.
Octet no. 1
Octet no. 2
bits-16/13 bits-12/1
Spare bits set to zero
Mode-2 code in octal representation
Encoding Rule :
This Item is optional

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EUROCONTROL-SPEC-0149-9
5.2.11
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Data Item I062/130, Calculated Track Geometric Altitude
Definition :
Vertical distance between the target and the projection of its position on the earth’s ellipsoid, as defined by WGS84, in two’s complement form.
Two-Octet fixed length data item.
Format : Structure:
Octet no. 1
Octet no. 2
bits- 16/1
(LSB)
Vmin Vmax
Altitude
= 6.25 ft
= -1500 ft
= 150000 ft
NOTES
LSB is required to be less than 10 ft by ICAO
The source of altitude is identified in bits (SRC) of item I062/080 Track Status
Encoding Rule :
This Item is optional

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5.2.12
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Data Item I062/135, Calculated Track Barometric Altitude
Definition :
Calculated Barometric Altitude of the track, in two’s complement form.
Two-Octet fixed length data item.
Format : Structure:
Octet no. 1
Octet no. 2
bit-16
(QNH) = 0 No QNH correction applied
= 1 QNH correction applied
Calculated Track Barometric Altitude (LSB) = 1/4 FL = 25 ft
Vmin = -15 FL Vmax = 1500 FL
bits-15/1
NOTE -
ICAO specifies a range between –10 FL and 1267 FL for Mode C
Encoding Rule :
This Item is optional

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5.2.13
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Data Item I062/136, Measured Flight Level
Definition :
Last valid and credible flight level used to update the track, in two’s complement form.
Two-Octet fixed length data item.
Structure:
Structure:
Octet no. 1
Octet no. 2
bits- 16/1
(LSB)
Vmin Vmax
Measured Flight Level
= 1/4 FL
= -15 FL
= 1500 FL
NOTES
The criteria to determine the credibility of the flight level are Tracker dependent.
Credible means: within reasonable range of change with respect to the previous detection.
ICAO specifies a range between –10 FL and 1267 FL for Mode C
This item includes the barometric altitude received from ADS-B
Encoding Rule :
This Item is optional

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5.2.14
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Data Item I062/185, Calculated Track Velocity (Cartesian)
Definition:
Calculated track velocity expressed in Cartesian co-ordinates, in two’s complement form.
Four-octet fixed length Data Item.
Format: Structure:
Octet no. 1
Octet no. 2
Octet no. 3
Octet no. 4
bits-32/17
Vx
(LSB) = 0.25 m/s
-8192m/s ≤ Vx ≤ 8191.75m/s Vy
(LSB) = 0.25 m/s
-8192m/s ≤ Vy ≤ 8191.75m/s
bits-16/1
NOTE -
The y-axis points to the Geographical North at the location of the target.
Encoding Rule :
This Item is optional

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EUROCONTROL-SPEC-0149-9
5.2.15
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Data Item I062/200, Mode of Movement
Definition : Format : Structure:
Calculated Mode of Movement of a target. One-Octet fixed length data item.
Octet no. 1
bits 8/7
(TRANS)
Transversal Acceleration
bits 6/5
(LONG)
Longitudinal Acceleration
= 00 Constant Groundspeed
= 01 Increasing Groundspeed
= 10 Decreasing Groundspeed
= 11 Undetermined
bits 4/3
(VERT)
Vertical Rate
= 00 Level
= 01 Climb
= 10 Descent
= 11 Undetermined
bit 2
(ADF)
Altitude Discrepancy Flag
= 0
= 1
No altitude discrepancy Altitude discrepancy
bit 1 Spare bit set to zero
NOTE: The ADF, if set, indicates that a difference has been detected in the altitude information derived from radar as compared to other technologies (such as ADS-B).
Encoding Rule :
This Item is optional

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5.2.16
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Data Item I062/210, Calculated Acceleration (Cartesian)
Definition :
Calculated Acceleration of the target expressed in Cartesian co- ordinates, in two’s complement form.
Two-octet fixed length Data Item.
Format: Structure:
Octet no. 1
Octet no. 2
bits-16/9
Ax
(LSB) = 0.25 m/s2
bits-8/1
Ay
(LSB) = 0.25 m/s2
NOTES
The y-axis points to the Geographical North at the location of the target.
Maximum value means maximum value or above.
Encoding Rule :
This Item is optional

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EUROCONTROL-SPEC-0149-9
5.2.17
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Data Item I062/220, Calculated Rate Of Climb/Descent
Definition :
Calculated rate of Climb/Descent of an aircraft in two’s complement form.
Two-Octet fixed length data item.
Format : Structure:
Octet no. 1
Octet no. 2
bit 16/1
Rate of Climb/Descent (LSB) = 6.25 feet/minute
NOTE -
A positive value indicates a climb, whereas a negative value indicates a descent.
Encoding Rule :
This Item is optional

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5.2.18
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Data Item I062/245, Target Identification
Target (aircraft or vehicle) identification in 8 characters. Seven-octet fixed length Data Item.
Definition: Format: Structure:
Octet no. 1
Octet no. 2
Octet no. 3
Octet no. 4
Octet no. 5
Octet no. 6
Octet no. 7
bits-54/49
Spare bits set to zero
bits-48/1
Characters 1-8 (coded on 6 bits each) defining target identification
NOTES
For coding, see section 3.1.2.9 of [Ref.3]
As the Callsign of the target can already be transmitted (in I062/380 Subfield #2 if downlinked from the aircraft or in I062/390 Subfield #2 if the target is correlated

System Track Messages
EUROCONTROL-SPEC-0149-9
to a flight plan), and in order to avoid confusion at end user’s side, this item SHALL not be used.
Encoding Rule :
This Item is optional
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5.2.19
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Data Item I062/270, Target Size & Orientation
Definition:
Target size defined as length and width of the detected target, and orientation.
Variable length Data Item comprising a first part of one octet, followed by one-octet extents as necessary.
Format:
Structure
of First Part:
Octet no. 1
bit-2 bit-1
(LSB)
(FX)
= 1 m
= 0 End of Data Item
= 1 Extension into first extent
Structure
of First Extent:
Octet no. 1

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I062/270, Target Size & Orientation
Structure of Second Extent:
Octet no. 1
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NOTES
The orientation gives the direction which the target nose is pointing to, relative to the Geographical North.
When the length only is sent, the largest dimension is provided.
Encoding Rule :
This Item is optional

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5.2.20
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Data Item I062/290, System Track Update Ages
Definition : Ages of the last plot/local track/target report update for each sensor type.
Format :
Compound Data Item, comprising a primary subfield of up to two octets, followed by the indicated subfields.
Structure of Primary Subfield:
Octet no. 1
Octet no. 2

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Structure of Subfield # 1: Track Age
Octet no. 1
bits-8/1
(TRK)
Actual track age since first occurence
= 1/4 s
Maximum value =63.75s
bit-1
(LSB)

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Item I062/290, System Track Update Ages
Structure of Subfield # 2: PSR Age
Octet no. 1
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bits-8/1
(PSR)
Age of the last primary detection used to update the track
= 1/4 s
Maximum value =63.75s
bit-1
(LSB)
Structure of Subfield # 3: SSR Age
Octet no. 1
bits-8/1
(SSR)
Age of the last secondary detection used to update the track
= 1/4 s
Maximum value = 63.75s
bit-1
(LSB)

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Item I062/290, System Track Update Ages
Structure of Subfield # 4: Mode S Age
Octet no. 1
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bits-8/1
(MDS)
Age of the last Mode S detection used to update the track
= 1/4 s
Maximum value = 63.75s
bit-1
(LSB)
Structure of Subfield # 5: ADS-C Age
Octet no. 1
Octet no. 2
bits-8/1
(ADS)
Age of the last ADS-C report used to update the track
= 1/4 s
Max. value = 16383.75s (> 4 hours)
bit-1
(LSB)

System Track Messages
EUROCONTROL-SPEC-0149-9
Item I062/290, System Track Update Ages
Structure of Subfield # 6: ES Age
Octet no. 1
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Maximum value = 63.75s
Structure of Subfield # 7: VDL Age
Octet no. 1
bits-8/1
(VDL)
Age of the last VDL Mode 4 ADS- B report used to update the track
= 1/4 s
Maximum value = 63.75s
bit-1
(LSB)

System Track Messages
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Item I062/290, System Track Update Ages
Structure of Subfield # 8: UAT Age
Octet no. 1
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Maximum value = 63.75s
Structure of Subfield # 9: Loop Age
Octet no. 1
bits-8/1
(LOP)
Age of the last magnetic loop detection
= 1/4 s
Maximum value = 63.75s
bit-1
(LSB)
Structure of Subfield # 10: Multilateration Age
Octet no. 1
bits-8/1 bit-1
(MLT)
(LSB)
Age of the last MLT detection
= 1/4 s
Maximum value = 63.75s

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EUROCONTROL-SPEC-0149-9
NOTES
Except for Track Age, the ages are counted from Data Item I062/070, Time Of Track Information, using the following formula:
Age = Time of track information - Time of last detection used to update the track
The time of last detection is derived from monosensor category time of day
If the data has never been received, then the corresponding subfield is not sent.
Maximum value means maximum value or above.
Encoding Rule :
This Item is optional
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5.2.21
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Data Item I062/295, Track Data Ages
Definition : Ages of the data provided.
Format :
Compound Data Item, comprising a primary subfield of up to five octets, followed by the indicated subfields.
Structure of Primary Subfield:
Octet no. 1
Octet no. 2
Octet no. 3
Octet no. 4
Octet no. 5

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bit-5/2 bit-1
spare bits set to zero
FX
Extension indicator
= 0 no extension
= 1 extension
NOTE -
Despite there are now two subfields (#29 and #30) reporting the ages of, respectively, the Indicated Airspeed track data and the Mach Number track data, the subfield #8 (and so its presence bit , bit-32) is kept free in order to prevent a full incompatibility with previous releases of ASTERIX Cat. 062 already implemented.
Item I062/295, Track Data Ages
Structure of Subfield # 1: Measured Flight Level Age
Octet no. 1
Maximum value =63.75s

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Item I062/295, Track Data Ages
Structure of Subfield # 2: Mode 1 Age
Octet no. 1
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Structure of Subfield # 3: Mode 2 Age
Octet no. 1

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Item I062/295, Track Data Ages
Structure of Subfield # 4: Mode 3/A Age
Octet no. 1
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Structure of Subfield # 5: Mode 4 Age
Octet no. 1

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Item I062/295, Track Data Ages
Structure of Subfield # 6: Mode 5 Age
Octet no. 1
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Structure of Subfield # 7 Magnetic Heading Age
Octet no. 1
bits-8/1
(MHG)
Age of the DAP “Magnetic Heading” in item 062/380 (Subfield #3)
= 1/4 s
Maximum value =63.75s
bit-1
(LSB)

System Track Messages
EUROCONTROL-SPEC-0149-9
Item I062/295, Track Data Ages
Structure of Subfield # 8 Indicated Airspeed / Mach Nb age
Octet no. 1
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Maximum value =63.75s
Despite there are now two subfields (#29 and #30) reporting the ages of, respectively, the Indicated Airspeed track data and the Mach Number track data, this former subfield is kept free in order to prevent a full incompatibility with previous releases of ASTERIX Cat. 062 already implemented.
NOTE -
Structure of Subfield # 9: True Airspeed Age
Octet no. 1

System Track Messages
EUROCONTROL-SPEC-0149-9
Item I062/295, Track Data Ages
Structure of Subfield # 10 Selected Altitude Age
Octet no. 1
Edition:1.19
Released Edition
Page 60
Structure of Subfield # 11:
Final State Selected Altitude Age
Octet no. 1

System Track Messages
EUROCONTROL-SPEC-0149-9
Item I062/295, Track Data Ages
Structure of Subfield # 12: Trajectory Intent Age
Octet no. 1
Edition:1.19
Released Edition
Page 61
Structure of Subfield # 13:
Communication/ACAS Capability and Flight Status Age
Octet no. 1

System Track Messages
EUROCONTROL-SPEC-0149-9
Item I062/295, Track Data Ages
Structure of Subfield # 14: Status Reported by ADS-B Age
Octet no. 1
Edition:1.19
Released Edition
Page 62
Structure of Subfield # 15:
ACAS Resolution Advisory Report Age
Octet no. 1

System Track Messages
EUROCONTROL-SPEC-0149-9
Item I062/295, Track Data Ages
Structure of Subfield # 16: Barometric Vertical Rate Age
Octet no. 1
Edition:1.19
Released Edition
Page 63
Structure of Subfield # 17: Geometrical Vertical Rate Age
Octet no. 1

System Track Messages
EUROCONTROL-SPEC-0149-9
Item I062/295, Track Data Ages
Structure of Subfield # 18: Roll Angle Age
Octet no. 1
Edition:1.19
Released Edition
Page 64
Structure of Subfield # 19: Track Angle Rate Age
Octet no. 1
Structure of Subfield # 20: Track Angle Age
Octet no. 1

System Track Messages
EUROCONTROL-SPEC-0149-9
Item I062/295, Track Data Ages
Structure of Subfield # 21: Ground Speed Age
Octet no. 1
Edition:1.19
Released Edition
Page 65
Structure of Subfield # 22: Velocity Uncertainty Age
Octet no. 1
Structure Subfield # 23: Meteorological Data Age
Octet no. 1

System Track Messages
EUROCONTROL-SPEC-0149-9
Item I062/295, Track Data Ages
Structure of Subfield # 24: Emitter Category Age
Octet no. 1
Edition:1.19
Released Edition
Page 66
Structure of Subfield # 25: Position Age
Octet no. 1
Structure of Subfield # 26: Geometric Altitude Age
Octet no. 1

System Track Messages
EUROCONTROL-SPEC-0149-9
Item I062/295, Track Data Ages
Structure of Subfield # 27: Position Uncertainty Age
Octet no. 1
Edition:1.19
Released Edition
Page 67
Structure of Subfield # 28: Mode S MB Data Age
Octet no. 1

System Track Messages
EUROCONTROL-SPEC-0149-9
Item I062/295, Track Data Ages
Structure of Subfield # 29: Indicated Airspeed Data Age
Octet no. 1
Edition:1.19
Released Edition
Page 68
Structure of Subfield # 30: Mach Number Data Age
Octet no. 1
Structure of Subfield # 31:
Barometric Pressure Setting Data Age
Octet no. 1
NOTE -
In all the subfields, the age is the time delay since the value was measured
Encoding Rule :
This Item is optional

System Track Messages
EUROCONTROL-SPEC-0149-9
5.2.22
Edition:1.19
Released Edition
Page 69
Data Item I062/300, Vehicle Fleet Identification
Vehicle fleet identification number. One octet fixed length Data Item.
Definition: Format: Structure:
Octet no. 1
bits 8-1
(VFI)
= 0 Unknown
= 1 ATC equipment maintenance
= 2 Airport maintenance
= 3 Fire
= 4 Bird scarer
= 5 Snow plough
= 6 Runway sweeper
= 7 Emergency
= 8 Police
= 9 Bus
= 10 Tug (push/tow)
= 11 Grass cutter
= 12 Fuel
= 13 Baggage
= 14 Catering
= 15 Aircraft maintenance
= 16 Flyco (follow me)
Encoding Rule :
This Item is optional

System Track Messages
EUROCONTROL-SPEC-0149-9
5.2.23
Data Item I062/340, Measured Information
Definition : All measured data related to the last report used to update the track.
Format :
Compound Data Item, comprising a primary subfield of one octet, followed by the indicated subfields.
Structure of Primary Subfield:
Octet no. 1
bit-8
(SID)
Subfield #1: Sensor Identification
= 0 Absence of Subfield #1
= 1 Presence of Subfield #1
bit-7
(POS)
Subfield #2: Measured Position
= 0 Absence of Subfield #2
= 1 Presence of Subfield #2
bit-6
(HEI)
Subfield #3: Measured 3-D Height
= 0 Absence of Subfield #3
= 1 Presence of Subfield #3
= 0 Absence of Subfield #5
= 1 Presence of Subfield #5
bit-3
(TYP)
Subfield #6: Report Type
= 0 Absence of Subfield #6
= 1 Presence of Subfield #6
bit-2 bit-1
(spare) FX
Spare bit set to zero Extension indicator
= 0 no extension
= 1 extension
NOTE -
The availability of the various data items differs depending on the surveillance technology used and is implementation dependent.
The term “last report” may refer to the “latest used” or “latest measured”. The actual meaning is implementation dependent and needs to be described in the ICD of the SDPS – please refer to chapter
4.8 above.
NOTE -
Edition:1.19
Released Edition
Page 70

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/340, Measured Information
Structure of Subfield # 1: Sensor Identification
Octet no. 1
Edition:1.19
Released Edition
Page 71
Octet no. 2
NOTE -
The up-to-date list of SACs is published on the EUROCONTROL Web Site (http://www.eurocontrol.int).
Structure of Subfield # 2: Measured Position
Octet no. 1
Octet no. 2
Octet no. 3
Octet no. 4
bits 32/17 bit 17
(RHO)
(LSB)
Measured distance:
= 1/256 NM
Maximum value = 256 NM
NOTE -
The measured position is:
In case of a plot, the measured bias-corrected polar co-ordinates;
In case of a sensor local track, the measured bias-corrected polar co-ordinates of the plot associated to the track;
In case of a local track without detection, the extrapolated bias- corrected polar co-ordinates.

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/340, Measured Information
Structure of Subfield # 3:
Measured 3-D Height in Two’s Complement
Octet no. 1
Edition:1.19
Released Edition
Page 72
Octet no. 2
bits-16/1
Height
(LSB) = 25 feet
NOTE -
The reference level for this height information is the same as the reference level applied by the sensor system providing this information.
Structure of Subfield # 4: Last Measured Mode C Code
Octet no. 1
Octet no. 2
bit 14/1
Last Measured Mode C Code, in two’s complement form
(LSB)
Vmin Vmax
= 1/4 FL
= -12 FL
= 1270 FL

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/340, Measured Information
Structure of Subfield # 5:
Last Measured Mode 3/A Code
Octet no. 1
Edition:1.19
Released Edition
Page 73
Octet no. 2
bit 13 bits 12/1
Spare bit set to zero
Mode 3/A reply under the form of 4 digits in octal representation
NOTE -
Smoothed MODE 3/A data (L = 1) will be used in case of absence of MODE 3/A code information in the plot or in case of difference between plot and sensor local track MODE 3/A code information.

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/340, Measured Information
Structure of Subfield # 6: Report Type
Octet no. 1
Edition:1.19
Released Edition
Page 74
bits-2/1
Spare bits set to zero
Encoding Rule :
This Item is optional

System Track Messages
EUROCONTROL-SPEC-0149-9
5.2.24
Edition:1.19
Released Edition
Page 75
Data Item I062/380, Aircraft Derived Data
Definition : Data derived directly by the aircraft.
Format :
Compound Data Item, comprising a primary subfield of up to four octets, followed by the indicated subfields.
Structure of Primary Subfield:
Octet no. 1
Octet no. 2
Octet no. 3
Octet no. 4
bit-32
(ADR)
Subfield #1: Target Address
= 0 Absence of Subfield #1
= 1 Presence of Subfield #1
bit-31
(ID)
Subfield #2: Target Identification
= 0 Absence of Subfield #2
= 1 Presence of Subfield #2
bit-30
(MHG)
Subfield #3: Magnetic Heading
= 0 Absence of Subfield #3
= 1 Presence of Subfield #3

System Track Messages
EUROCONTROL-SPEC-0149-9
bit-29
Edition:1.19
Released Edition
Page 76
(IAS)
Subfield #4: Indicated Airspeed/
Mach Number
= 0 Absence of Subfield #4
= 1 Presence of Subfield #4
bit-28
(TAS)
Subfield #5: True Airspeed
= 0 Absence of Subfield #5
= 1 Presence of Subfield #5
bit-27
(SAL)
Subfield #6: Selected Altitude
= 0 Absence of Subfield #6
= 1 Presence of Subfield #6
bit-26
(FSS)
Subfield #7: Final State Selected Altitude
= 0 Absence of Subfield #7
= 1 Presence of Subfield #7
bit-25
FX
Extension indicator
= 0 no extension
= 1 extension
bit-24
(TIS)
Subfield #8: Trajectory Intent Status
= 0 Absence of Subfield #8
= 1 Presence of Subfield #8
bit-23
(TID)
Subfield #9: Trajectory Intent Data
= 0 Absence of Subfield #9
= 1 Presence of Subfield #9
bit-22
(COM)
Subfield #10: Communications / ACAS Capability and Flight Status
= 0 Absence of Subfield #10
= 1 Presence of Subfield #10
bit-21
(SAB)
Subfield #11: Status reported by ADS-B
= 0 Absence of Subfield #11
= 1 Presence of Subfield #11
bit-20
(ACS)
Subfield #12: ACAS Resolution Advisory Report
= 0 Absence of Subfield #12
= 1 Presence of Subfield #12
bit-19
(BVR)
Subfield #13: Barometric Vertical Rate
= 0 Absence of Subfield #13
= 1 Presence of Subfield #13
bit-18
(GVR)
Subfield #14: Geometric Vertical Rate
= 0 Absence of Subfield #14
= 1 Presence of Subfield #14
bit-17
FX
Extension indicator
= 0 no extension
= 1 extension
bit-16
(RAN)
Subfield #15: Roll Angle
Absence of Subfield #15
= 0
= 1 Presence of Subfield #15

System Track Messages
EUROCONTROL-SPEC-0149-9
bit-15
Edition:1.19
Released Edition
Page 77
(TAR)
Subfield #16: Track Angle Rate
= 0 Absence of Subfield #16
= 1 Presence of Subfield #16
bit-14
(TAN)
Subfield #17: Track Angle
= 0 Absence of Subfield #17
= 1 Presence of Subfield #17
bit-13
(GSP)
Subfield #18: Ground Speed
= 0 Absence of Subfield #18
= 1 Presence of Subfield #18
bit-12
(VUN)
Subfield #19: Velocity Uncertainty
= 0 Absence of Subfield #19
= 1 Presence of Subfield #19
bit-11
(MET)
Subfield #20: Meteorological Data
= 0 Absence of Subfield #20
= 1 Presence of Subfield #20
bit-10
(EMC)
Subfield #21: Emitter Category
= 0 Absence of Subfield #21
= 1 Presence of Subfield #21
bit-9
FX
Extension indicator
= 0 no extension
= 1 extension
bit-8
(POS)
Subfield #22: Position Data
= 0 Absence of Subfield #22
= 1 Presence of Subfield #22
bit-7
(GAL)
Subfield #23: Geometric Altitude Data
= 0 Absence of Subfield #23
= 1 Presence of Subfield #23
bit-6
(PUN)
Subfield #24: Position Uncertainty Data
= 0 Absence of Subfield #24
= 1 Presence of Subfield #24
bit-5
(MB)
Subfield #25: Mode S MB Data
= 0 Absence of Subfield #25
= 1 Presence of Subfield #25
bit-4
(IAR)
Subfield #26: Indicated Airspeed
= 0 Absence of Subfield #26
= 1 Presence of Subfield #26
bit-3
(MAC)
Subfield #27: Mach Number
= 0 Absence of Subfield #27
= 1 Presence of Subfield #27
bit-2
(BPS)
Subfield #28: Barometric Pressure Setting.
= 0 Absence of Subfield #28
= 1 Presence of Subfield #28
bit-1
FX
Extension indicator
= 0 no extension
= 1 extension

System Track Messages
EUROCONTROL-SPEC-0149-9
NOTE -
Edition:1.19
Released Edition
Page 78
Despite there are now two subfields (#26 and #27) reporting , respectively, the Indicated Airspeed track data and the Mach Number track data, the former subfield #4 (and its presence bit, bit-37) is kept in order to prevent a full incompatibility with previous releases of ASTERIX Cat. 062 already implemented.
Data Item I062/380, Aircraft Derived Data
Structure of Subfield # 1: Target Address
Octet no. 1
Octet no. 2
Octet no. 3
bits 24/1
24 bits Target Address, A23 to A0

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/380, Aircraft Derived Data
Structure of Subfield # 2: Target Identification
Octet no. 1
Edition:1.19
Released Edition
Page 79
Octet no. 2
Octet no. 3
Octet no. 4
Octet no. 5
Octet no. 6
bits 48/1
Characters 1-8 (coded on 6 bits each) defining a target identification when flight plan is available or the registration marking when no flight plan is available.
Coding rules are provided in [3] Section 3.1.2.9.1.2 and Table 3-9
Structure of Subfield # 3: Magnetic Heading
Octet no. 1
Octet no. 2
bits-16/1
Magnetic Heading
(LSB) = 360° / 216 ≅ 0.0055°

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/380, Aircraft Derived Data
Structure of Subfield # 4: Indicated Airspeed / Mach No
Edition:1.19
Released Edition
Page 80
Octet no. 1
Octet no. 2
bit-16
bits-15/1
(IM) = 0 Air Speed = IAS, LSB (Bit-1) = 2-14 NM/s
= 1 Air Speed = Mach, LSB (Bit-1) = 0.001
Air Speed (IAS or Mach)
NOTE -
Despite there are now two subfields (#26 and #27) reporting, respectively, the Indicated Airspeed track data and the Mach Number track data, this former subfield is kept free in order to prevent a full incompatibility with previous releases of ASTERIX Cat. 062 already implemented.
Structure of Subfield # 5: True Airspeed
Octet no. 1
Octet no. 2
bits-16/1
True Air Speed (LSB) = 1 knot
0 ≤ True Air Speed ≤ 2046 knots

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/380, Aircraft Derived Data
Structure of Subfield # 6: Selected Altitude
Edition:1.19
Released Edition
Page 81
Definition :
The short-term vertical intent as described by either the FMS selected altitude, the Altitude Control Panel Selected Altitude (FCU/MCP), or the current aircraft altitude according to the aircraft's mode of flight.
Octet no. 1 Octet no. 2
bit-16
(SAS)
= 0 No source information provided
= 1 Source Information provided

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/380, Aircraft Derived Data
Structure of Subfield # 7: Final State Selected Altitude
Edition:1.19
Released Edition
Page 82
Definition :
The vertical intent value that corresponds with the ATC cleared altitude, as derived from the Altitude Control Panel (FCU/MCP).
Octet no. 1
Octet no. 2
bit-15
(AH)
Altitude Hold
= 0 Not active
= 1 Active
bit-14
(AM)
Approach Mode
= 0 Not active
= 1 Active
bits- 13/1
(Altitude)
Altitude in two’s complement form LSB=25ft
-1300ft ≤ Altitude ≤ 100000ft

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/380, Aircraft Derived Data
Structure of Subfield #8: Trajectory Intent Status
Edition:1.19
Released Edition
Page 83
bits-6/2
Spare Bits set to zero

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/380, Aircraft Derived Data
Structure of Subfield # 9: Trajectory Intent Data
Edition:1.19
Released Edition
Page 84
Format:
Repetitive Data Item starting with a one-octet Field Repetition Indicator (REP) followed by at least one Trajectory Intent Point comprising fifteen octets
Octet no. 1
Octet no. 2
Octet no. 3
Octet no. 4
Octet no. 5
Octet no. 6
Octet no. 7
Octet no. 8
Octet no. 9
Octet no. 10
Octet no. 11
Octet no. 12
Octet no. 13
Octet no. 14
Octet no. 15
Octet no. 16

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/380, Aircraft Derived Data, Subfield #9: Trajectory Intent Data
Edition:1.19
Released Edition
Page 85

System Track Messages
EUROCONTROL-SPEC-0149-9
NOTES
NC is set to one when the aircraft will not fly the path described by the TCP data.
TCP numbers start from zero.
LT = Lateral Type
VT = Vertical Type
TOV gives the estimated time before reaching the point. It is defined as the absolute time from midnight.
TOV is meaningful only if TOA is set to 0
Edition:1.19
Released Edition
Page 86

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/380, Aircraft Derived Data
Structure of Subfield # 10:
Communications/ACAS Capability and Flight Status reported by Mode-S
Octet no. 1 Octet no. 2
Edition:1.19
Released Edition
Page 87
bits-16/14
(COM)
Communications capability of the transponder
= 0 No communications capability (surveillance only)
= 1 Comm. A and Comm. B
capability
= 2 Comm. A, Comm. B and Uplink ELM
= 3 Comm. A, Comm. B, Uplink ELM and Downlink ELM
= 4 Level 5 Transponder capability 5 to 7Not assigned
bits-13/11
(STAT)
Flight Status
= 0 No alert, no SPI, aircraft airborne
= 1 No alert, no SPI, aircraft on ground
= 2 Alert, no SPI, aircraft airborne
= 3 Alert, no SPI, aircraft on
ground
= 4 Alert, SPI, aircraft airborne or on ground
= 5 No alert, SPI, aircraft airborne or on ground
= 6 Not defined
= 7 Unknown or not yet extracted
bit-10/9
Spare bit set to zero
bit-8
(SSC) Specific service capability
= 0 No
= 1 Yes
bit-7
(ARC)
Altitude reporting capability
= 0 100 ft resolution
= 1 25 ft resolution
bit-6
(AIC)
Aircraft identification capability
= 0 No
= 1 Yes

System Track Messages
EUROCONTROL-SPEC-0149-9
Edition:1.19
Released Edition
Page 88

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/380, Aircraft Derived Data
Structure of Subfield # 11: Status reported by ADS-B
Octet no. 1
Edition:1.19
Released Edition
Page 89
Octet no. 2
bits-9/4 spare bits set to zero
bits-3/1 (STAT) Flight Status
= 0 No emergency
= 1 General emergency
= 2 Lifeguard / medical
= 3 Minimum fuel
= 4 No communications
= 5 Unlawful interference
= 6 “Downed” Aircraft
= 7 Unknown

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/380, Aircraft Derived Data
Structure of Subfield # 12:
ACAS Resolution Advisory Report
Edition:1.19
Released Edition
Page 90
Definition :
Currently active Resolution Advisory (RA), if any, generated by the ACAS associated with the transponder transmitting the report and threat identity data.
Seven-octet fixed length Data Item.
Octet no. 1 Octet no. 2
Format :
Octet no. 3
Octet no. 4
Octet no. 5
Octet no. 6
Octet 7
bits-56/1
(MB Data)
56-bit message conveying Mode S Comm B message data of BDS Register 3,0
NOTE -
Refer to ICAO Draft SARPs for ACAS for detailed explanations.

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/380, Aircraft Derived Data
Structure of Subfield # 13: Barometric Vertical Rate
Edition:1.19
Released Edition
Page 91
Octet no. 1
Octet no. 2
bits-16/1
Barometric Vertical Rate in two’s complement form
(LSB) =
6.25 feet/minute
Structure of Subfield # 14: Geometric Vertical Rate
Octet no. 1
Octet no. 2
bits-16/1
Geometric Vertical Rate in two’s complement form
(LSB) =
6.25 feet/minute

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/380, Aircraft Derived Data
Structure of Subfield # 15: Roll Angle
Edition:1.19
Released Edition
Page 92
Octet no. 1
Octet no. 2
bits-16/1
Roll Angle in two’s complement form
(LSB) = 0.01 degree
-180 ≤ Roll Angle ≤ 180
Structure of Subfield # 16: Track Angle Rate
Octet no. 1
Octet no. 2
bits-16/15 (TI)
Turn Indicator
00 = Not available 01 = Left
10 = Right
11 = Straight
spare bits set to zero
Rate of Turn in two’s complement form (LSB) = 2-2 °/s = 1/4 °/s
-15 °/s ≤ Rate of Turn ≤ 15 °/s
spare bit set to zero
bits-14/9 bits-8/2
bit 1
NOTES
A positive value represents a right turn, whereas a negative value represents a left turn.
Value 15 means 15°/s or above.

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/380, Aircraft Derived Data
Edition:1.19
Released Edition
Page 93
Structure of Subfield # 17: Track Angle
Octet no. 1
Octet no. 2
bits-16/1 (LSB) =
Track Angle
360° / 216 = approx. 0.0055°
Structure of Subfield # 18: Ground Speed
Octet no. 1
Octet no. 2
bits-16/1
Ground Speed in two's complement form referenced to WGS84
(LSB) = 2-14 NM/s ≅ 0.22 kt
-2 NM/s ≤ Ground Speed < 2 NM/s
Structure of Subfield # 19: Velocity Uncertainty
Octet no. 1
NOTE - Velocity uncertainty category of the least accurate velocity component

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/380, Aircraft Derived Data
Structure of Subfield # 20: Met Data
Octet no. 1
Edition:1.19
Released Edition
Page 94
Octet no. 2
Octet no. 3
Octet no. 4
Octet no. 5
Octet no. 6
Octet no. 7
Octet no. 8

System Track Messages
EUROCONTROL-SPEC-0149-9
(LSB) = 0.25 °C
-100 °C ≤ Temperature ≤ 100 °C
Edition:1.19
Released Edition
Page 95
bits-8/1
Turbulence
Integer between 0 and 15 inclusive
Data Item I062/380, Aircraft Derived Data
Structure of Subfield # 21: Emitter Category
Octet no. 1
bits-8/1
(ECAT)
1 = light aircraft ≤ 7000 kg 2 = reserved
3 = 7000 kg < medium aircraft < 136000 kg 4 = reserved
5 = 136000 kg ≤ heavy aircraft
6 = highly manoeuvrable (5g acceleration capability) and high speed (>400 knots cruise)
7 to 9 = reserved
10 = rotocraft
11 = glider / sailplane 12 = lighter-than-air
13 = unmanned aerial vehicle
14 = space / transatmospheric vehicle 15 = ultralight / handglider / paraglider
16 = parachutist / skydiver 17 to 19 = reserved
20 = surface emergency vehicle 21 = surface service vehicle
22 = fixed ground or tethered obstruction 23 to 24 = reserved

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/380, Aircraft Derived Data
Structure of Subfield # 22: Position
Octet no. 1
Edition:1.19
Released Edition
Page 96
Octet no. 2
Octet no. 3
Octet no. 4
Octet no. 5
Octet no. 6
bits-48/25
(Latitude)
In WGS.84 in two’s complement form. Range -90 ≤ latitude ≤ 90 deg.
LSB = 180/223 degrees
= 2.145767 * 10-05 degrees.
This corresponds to a resolution of at least 2.4 meters
In WGS.84 in two’s complement form. Range -180 ≤ longitude < 180 deg.
LSB = 180/223 degrees
= 2.145767 * 10-05 degrees.
This corresponds to a resolution of at least 2.4 meters.
bits-24/1
(Longitude)
NOTE -
Positive longitude indicates East. Positive latitude indicates North.

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/380, Aircraft Derived Data
Structure of Subfield # 23: Geometric Altitude
Octet no. 1
Edition:1.19
Released Edition
Page 97
Octet no. 2
bit 16/1
(Altitude)
Altitude in two’s complement form
-1500 ft ≤ Altitude ≤ 150000 ft (LSB) = 6.25 ft
NOTE - LSB is required to be less than 10 ft by ICAO
Structure of Subfield # 24: Position Uncertainty
Octet no. 1
bits-8/5 bits-4/1
Spare bits set to zero (PUN) Position Uncertainty

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/380, Aircraft Derived Data
Structure of Subfield # 25: MODE S MB DATA
Format :
Repetitive starting with an one-octet Field Repetition Indicator (REP) followed by at least one BDS report comprising one seven octet BDS register and one octet BDS code.
Structure:
Octet no. 1
Octet no. 2
Octet no. 3
Octet no. 4
Octet no. 5
MB Data (56 bits)
Octet no. 6
Octet no.7
Octet no. 8
Edition:1.19
Released Edition
Page 98
Octet no. 9
NOTE - Only DAPs that cannot be encoded into other subfields of this item should be sent using subfield #25

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/380, Aircraft Derived Data
Structure of Subfield # 26: Indicated Airspeed
Edition:1.19
Released Edition
Page 99
Octet no. 1
Octet no. 2
bit 16/1
0 Kt ≤ Indicated Airspeed ≤ 1100 Kt (LSB) = 1 Kt
Structure of Subfield # 27 Mach Number
Octet no. 1
Octet no. 2
bit 16/1
0 ≤ Mach Number ≤ 4.096 (LSB) = Mach 0.008

System Track Messages
EUROCONTROL-SPEC-0149-9
Structure of Subfield # 28: Barometric Pressure Setting
Edition:1.19
Released Edition
Page 100
Octet no. 1
Octet no. 2
bit-16/13
bits- 12/1 (BPS)
Spare bits set to 0. LSB=0.1mb
-0mb ≤ BPS ≤ 409.5 mb
BPS is the barometric pressure setting of the aircraft minus 800 mb.
As of Edition 1.19 the note “(derived from Mode S BDS 4,0)” has been removed to allow transmission of BPS received via ADS-B.
NOTE - NOTE -
Encoding Rule :
This Item is optional
5.2.25
Data Item I062/390, Flight Plan Related Data
Definition : All flight plan related information, provided by ground-based systems.
Format :
Compound Data Item, comprising a primary subfield of up to three octets, followed by the indicated subfields.
Structure of Primary Subfield:
Octet no. 1
Octet no. 2
Octet no. 3

System Track Messages
EUROCONTROL-SPEC-0149-9
Edition:1.19
Released Edition
Page 101

System Track Messages
EUROCONTROL-SPEC-0149-9
Edition:1.19
Released Edition
Page 102
Data Item I062/390, Flight Plan Related Data
Structure of Subfield # 1: FPPS Identification Tag
Octet no. 1
Octet no. 2
NOTE -
The up-to-date list of SACs is published on the EUROCONTROL Web Site (http://www.eurocontrol.int).

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/390, Flight Plan Related Data
Structure of Subfield # 2: Callsign
Octet no. 1
Edition:1.19
Released Edition
Page 103
Octet no. 2
Octet no. 3
Octet no. 4
Octet no. 5
Octet no. 6
Octet no. 7
NOTE -
Each one of the seven Octets contains an ASCII Character. The Callsign is always left adjusted. It contains up to seven upper-case alphanumeric characters, the remaining character positions (if any) are padded with space characters.

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/390, Flight Plan Related Data
Structure of Subfield # 3: IFPS_FLIGHT_ID
Octet no. 1
Edition:1.19
Released Edition
Page 104
Octet no. 2
Octet no. 3
Octet no. 4
bits-32/31
(TYP) = 00 Plan Number
= 01 Unit 1 internal flight number
= 10 Unit 2 internal flight number
= 11 Unit 3 internal flight number
bits-30/28 bits-27/1
spare bits set to zero
(NBR) Number from 0 to 99 999 999

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/390, Flight Plan Related Data
Structure of Subfield # 4: Flight Category
Octet no. 1
Edition:1.19
Released Edition
Page 105
bit 1
Spare bit set to zero

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/390, Flight Plan Related Data
Structure of Subfield # 5: Type of Aircraft
Octet no. 1
Edition:1.19
Released Edition
Page 106
Octet no. 2
Octet no. 3
Octet no. 4
NOTES
Each one of the four Octets composing the type of an aircraft contains an ASCII Character (upper-case alphanumeric characters with trailing spaces).
The types of aircraft are defined in [Ref.4]
Structure of Subfield # 6: Wake Turbulence Category
Octet no. 1
bits 8/1
Wake Turbulence Category is an ASCII character code which should be one of the following values:
L = Light
M = Medium H = Heavy
J = “Super”

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/390, Flight Plan Related Data
Structure of Subfield # 7: Departure Airport
Octet no. 1
Edition:1.19
Released Edition
Page 107
Octet no. 2
Octet no. 3
Octet no.4
NOTES
Each one of the four Octets composing the name of an airport contains an ASCII Character (upper case alphabetic).
The Airport Names are indicated in the ICAO Location Indicators book.
Structure of Subfield # 8 Destination Airport
Octet no. 1
Octet no. 2
Octet no. 3
Octet no. 4
NOTES
Each one of the four Octets composing the name of an airport contains an ASCII Character (upper case alphabetic).
The Airport Names are indicated in the ICAO Location Indicators book.

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/390, Flight Plan Related Data
Structure of Subfield # 9: Runway Designation
Octet no. 1
Edition:1.19
Released Edition
Page 108
Octet no. 2
Octet no. 3
NU1, NU2 and LTR each contain an ASCII character
For details refer to.[5] Section 5
Structure of Subfield # 10: Current Cleared Flight Level
Octet no. 1
Octet no. 2
bits 16/1
(CFL)
LSB = 1/4 FL
Range: 0 ≤ CFL ≤ 1500FL

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/390, Flight Plan Related Data
Structure of Subfield # 11: Current Control Position
Octet no. 1
Edition:1.19
Released Edition
Page 109
Octet no. 2
NOTE -
The centre and the control position identification codes have to be defined between communication partners.

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/390, Flight Plan Related Data
Structure of Subfield # 12: Time of Departure / Arrival
Octet no. 1
Edition:1.19
Released Edition
Page 110
Octet no. 2
Octet no. 3
Octet no. 4
Octet no. 5
bits-40/33
(REP)
Repetition Factor

System Track Messages
EUROCONTROL-SPEC-0149-9
bits-27/26
Edition:1.19
Released Edition
Page 111
(DAY)
= 00 Today
= 01 Yesterday
= 10 Tomorrow
= 11 Invalid
bits-25/22 bits-21/17 bits-16/15 bits-14/9 bit-8
spare bits set to zero (HOR) Hours, from 0 to 23 spare bits set to zero
(MIN) Minutes, from 0 to 59 (AVS)
= 0 Seconds available
= 1 Seconds not available
bit-7 spare bits set to zero
bits-6/1 (SEC) Seconds, from 0 to 59
NOTE - Estimated times are derived from flight plan systems. Predicted times are derived by the fusion system, based on surveillance data. For definitions, see [Ref.4]

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/390, Flight Plan Related Data
Structure of Subfield # 13: Aircraft Stand
Octet no. 1
Edition:1.19
Released Edition
Page 112
Octet no. 2
Octet no. 3
Octet no. 4
Octet no. 5
Octet no. 6
NOTE -
Each one of the six Octets contains an ASCII Character. The Aircraft Stand identification is always left adjusted. It contains up to six upper- case alphanumeric characters, the remaining character positions (if any) are padded with space characters.

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/390, Flight Plan Related Data
Structure of Subfield # 14: Stand Status
Octet no. 1
Edition:1.19
Released Edition
Page 113

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/390, Flight Plan Related Data
Structure of Subfield # 15: Standard Instrument Departure
Octet no. 1
Edition:1.19
Released Edition
Page 114
Octet no. 2
Octet no. 3
Octet no. 4
Octet no. 5
Octet no. 6
Octet no. 7
NOTE - Each one of the seven Octets contains an ASCII Character. The SID is always left adjusted. It contains up to seven alphanumeric characters, the remaining character positions (if any) are padded with space characters.

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/390, Flight Plan Related Data
Structure of Subfield # 16: Standard Instrument Arrival
Octet no. 1
Edition:1.19
Released Edition
Page 115
Octet no. 2
Octet no. 3
Octet no. 4
Octet no. 5
Octet no. 6
Octet no. 7
NOTE - Each one of the seven Octets contains an ASCII Character. The STAR is always left adjusted. It contains up to seven alphanumeric characters, the remaining character positions (if any) are padded with space characters.
Encoding Rule :
This Item is optional

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/390, Flight Plan Related Data
Structure of Subfield # 17: Pre-Emergency Mode 3/A
Edition:1.19
Released Edition
Page 116
Octet no. 1
Octet no. 2
This subfield is used only when the aircraft is transmitting an emergency Mode 3/A code
If VA = 0, the content of bits 12/1 is meaningless

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/390, Flight Plan Related Data
Structure of Subfield # 18: Pre-Emergency Callsign
Octet no. 1
Edition:1.19
Released Edition
Page 117
Octet no. 2
Octet no. 3
Octet no. 4
Octet no. 5
Octet no. 6
Octet no. 7
NOTES
Each one of the seven Octets contains an ASCII Character. The Callsign is always left adjusted. It contains up to seven upper-case alphanumeric characters, the remaining character positions (if any) are padded with space characters
This subfield is used only when an emergency Mode 3/A is associated with the track (I062/390 Subfield #17)

System Track Messages
EUROCONTROL-SPEC-0149-9
5.2.26
Edition:1.19
Released Edition
Page 118
Data Item I062/500, Estimated Accuracies
Definition : Overview of all important accuracies
Format :
Compound Data Item, comprising a primary subfield of up to two octets, followed by the indicated subfields.
Structure of Primary Subfield:
Octet no. 1
Octet no. 2
Altitude
= 0 Absence of subfield #4
= 1 Presence of subfield #4
Subfield #5: Estimated Accuracy Of Calculated Track Barometric Altitude
bit 12
(ABA)

System Track Messages
EUROCONTROL-SPEC-0149-9
Edition:1.19
Released Edition
Page 119

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/500, Estimated Accuracies
Structure of Subfield # 1:
Estimated Accuracy Of Track Position (Cartesian)
Edition:1.19
Released Edition
Page 120
Octet no. 1
Octet no. 2
Octet no. 3
Octet no. 4
NOTE - Maximum value means maximum value or above.
Structure of Subfield # 2:
XY covariance component
Octet no. 1 Octet no. 2
bits 16/1
(COV)
bits 1 (LSB)
XY Covariance Component in two’s complement form
= 0.5m
Notes:
XY covariance component = sign {Cov(X,Y)} * sqrt {abs [Cov (X,Y)]}
The maximum value for the (unsigned) XY covariance component is 16.383 km.

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/500, Estimated Accuracies
Structure of Subfield #3:
Estimated Accuracy Of Track Position (WGS-84)
Octet no. 1
Edition:1.19
Released Edition
Page 121
Octet no. 2
Octet no. 3
Octet no. 4
NOTE -
Maximum value means maximum value or above.
Structure of Subfield #4:
Estimated Accuracy Of Calculated Track Geometric Altitude
Octet no. 1
NOTE -
Maximum value means maximum value or above.

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/500, Estimated Accuracies
Structure of Subfield #5:
Estimated Accuracy Of Calculated Track Barometric Altitude
Octet no. 1
Edition:1.19
Released Edition
Page 122
NOTE -
Maximum value means maximum value or above.
Structure of Subfield #6:
Estimated Accuracy Of Track Velocity (Cartesian)
Octet no. 1
Octet no. 2
bits 16/1
(ATV)
Estimated accuracy
(i.e. standard deviation) of the calculated track velocity
in Cartesian co-ordinates.
bits 9 and 1 (LSB) = 0.25m/s
Maximum value means maximum value or above.
NOTE -

System Track Messages
EUROCONTROL-SPEC-0149-9
Data Item I062/500, Estimated Accuracies
Structure of Subfield #7:
Estimated Accuracy Of Acceleration (Cartesian)
Octet no. 1
Edition:1.19
Released Edition
Page 123
Octet no. 2
NOTE - Maximum value means maximum value or above.
Structure of Subfield #8:
Estimated Accuracy Of Rate Of Climb/Descent
Octet no. 1
NOTE - Maximum value means maximum value or above.
Encoding Rule :This Item is optional

System Track Messages
EUROCONTROL-SPEC-0149-9
5.2.27
Edition:1.19
Released Edition
Page 124
Data Item I062/510, Composed Track Number
Definition : Structure:
Identification of a system track
Extendible data item, comprising a first part of three octets (Master Track Number), followed by three-octet extents (Slave Tracks Numbers).
Structure of First Part:
Octet no. 1
Octet no. 2
Octet no. 3
bits 24/17
(SYSTEM UNIT IDENTIFICATION)
(SYSTEM TRACK NUMBER)
= 0 end of data item
= 1 extension into next extent
bits 16/2 bit 1
(FX) =

System Track Messages
EUROCONTROL-SPEC-0149-9
Structure of next Extents:
Octet no. 1
Edition:1.19
Released Edition
Page 125
Octet no. 2
Octet no. 3
bits 24/17
(SYSTEM UNIT IDENTIFICATION)
(SYSTEM TRACK NUMBER)
= 0 end of data item
= 1 extension into next extent
bits 16/2
bit 1 (FX) =
NOTE -
The composed track number is used by co-operating units to uniquely identify a track. It consists of the unit identifier and system track number for each unit involved in the co-operation. The first unit identification identifies the unit that is responsible for the track amalgamation.
Encoding Rule :
This Item is optional

System Track Messages
EUROCONTROL-SPEC-0149-9
5.3 Transmission of Service Prediction Report Messages
The following User Application Profile shall be used for the transmission of System Track Data.
Table 2 – Track Information UAP
Edition:1.19
Released Edition
Page 126

System Track Messages
EUROCONTROL-SPEC-0149-9
Edition:1.19
Released Edition
Page 127
NOTE -
The Field Reference Number #2 is kept free in order to prevent a full incompatibility with previous releases of ASTERIX Cat. 062 already implemented.
In the above table
the first column indicates the Field Reference Number (FRN) associated to each Data Item used in the UAP;
the fourth column gives the format and the length of each item, a stand-alone figure indicates the octet-count of a fixed-length Data Item, 1+ indicates a variable-length Data Item comprising a first part of 1 octet followed by n- octets extents as necessary.