asterix specification

Asterix category 247 - Version Number Exchange

category: 247

edition: 1.3

date: 2021-08-31

Preamble

Surveillance data exchange.

Description of standard data items

I247/010 - Data Source Identifier

definition: Identification of the radar station from which the data are received.

Group

I247/010/SAC - System Area Code

Element

bit size: 8

Raw Content

I247/010/SIC - System Identification Code

Element

bit size: 8

Raw Content

Note:

The defined SACs are on the EUROCONTROL ASTERIX website (www.eurocontrol.int/asterix)

I247/015 - Service Identification

definition: Identification of the service provided to one or more users.

Element

bit size: 8

Raw Content

The service identification is allocated by the system.

I247/140 - Time of Day

definition: Absolute time stamping expressed as UTC.

Element

bit size: 24

Unsigned quantity

LSB = 1/27 s ≈ 7.8125e − 3 s

unit: "s"

The time of day value is reset to zero each day at midnight.

I247/550 - Category Version Number Report

definition: Version number of Categories used.

Repetitive

Regular, 1 byte(s) REP field size.

Group

I247/550/CAT - Category

Element

bit size: 8

Unsigned integer

I247/550/MAIN - Main Version Number

Element

bit size: 8

Unsigned integer

I247/550/SUB - Sub Version Number

Element

bit size: 8

Unsigned integer

Notes:

  1. The Version Number corresponds to the Edition of the ASTERIX Category specification
  2. The version number(s) corresponding to the Edition of the ASTERIX Category Reserved Expansion Field(s) can be specified in the REF.
  3. The version number(s) corresponding to the Edition of the ASTERIX Category Special Purpose Field(s) may be specified in the SPF.

I247/RE - Reserved Expansion Field

definition: Expansion

Explicit (ReservedExpansion)

I247/SP - Special Purpose Field

definition: Special Purpose Field

Explicit (SpecialPurpose)

User Application Profile