asterix specification

Asterix category 019 - Multilateration System Status Messages

category: 019

edition: 1.3

date: 2010-12-01

Preamble

Surveillance data exchange.

Description of standard data items

I019/000 - Message Type

definition: This Data Item allows for a more convenient handling of the messages at the receiver side by further defining the type of information.

Element

bit size: 8

Values:

1:
Start of Update Cycle
2:
Periodic Status Message
3:
Event-triggered Status Message
NOTES:
  1. In applications where data of various types is exchanged, the Message Type Data Item facilitates the proper message handling at the receiver side.
  2. All Message Type values are reserved for common standard use.

I019/010 - Data Source Identifier

definition: Identification of the system from which the data is received.

Group

I019/010/SAC - System Area Code

Element

bit size: 8

Raw Content

I019/010/SIC - System Identification Code

Element

bit size: 8

Raw Content

Note:

I019/140 - 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"

Note:

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

I019/550 - System Status

definition: Information concerning the configuration and status of a System.

Group

I019/550/NOGO - Operational Release Status of the System

Element

bit size: 2

Values:

0:
Operational
1:
Degraded
2:
NOGO
3:
Undefined

I019/550/OVL - Overload Indicator

Element

bit size: 1

Values:

0:
No overload
1:
Overload

I019/550/TSV - Time Source Validity

Element

bit size: 1

Values:

0:
Valid
1:
Invalid

I019/550/TTF - Test Target

Element

bit size: 1

Values:

0:
Test Target Operative
1:
Test Target Failure

Spare bits: 3

Note:

A time source is considered as valid when either externally synchronised or running on a local oscillator within the required accuracy of UTC.

I019/551 - Tracking Processor Detailed Status

definition: Information concerning the configuration and status of the Tracking processors.

Group

I019/551/TP1A

Element

bit size: 1

Values:

0:
Standby
1:
Exec

I019/551/TP1B

Element

bit size: 1

Values:

0:
Faulted
1:
Good

I019/551/TP2A

Element

bit size: 1

Values:

0:
Standby
1:
Exec

I019/551/TP2B

Element

bit size: 1

Values:

0:
Faulted
1:
Good

I019/551/TP3A

Element

bit size: 1

Values:

0:
Standby
1:
Exec

I019/551/TP3B

Element

bit size: 1

Values:

0:
Faulted
1:
Good

I019/551/TP4A

Element

bit size: 1

Values:

0:
Standby
1:
Exec

I019/551/TP4B

Element

bit size: 1

Values:

0:
Faulted
1:
Good

Note:

Both Bits of one TP set to zero means, that this TP is not used in the system.

I019/552 - Remote Sensor Detailed Status

definition: Information concerning the configuration and status of the Remote Sensors (RS)

Repetitive

Regular, 1 byte(s) REP field size.

Group

I019/552/RSI - 8-bit Identification Number of RS

Element

bit size: 8

Raw Content

Spare bits: 1

I019/552/RS1090 - Receiver 1090 MHz

Element

bit size: 1

Values:

0:
Not present
1:
Present

I019/552/TX1030 - Transmitter 1030 MHz

Element

bit size: 1

Values:

0:
Not present
1:
Present

I019/552/TX1090 - Transmitter 1090 MHz

Element

bit size: 1

Values:

0:
Not present
1:
Present

I019/552/RSS - RS Status

Element

bit size: 1

Values:

0:
Faulted
1:
Good

I019/552/RSO - RS Operational

Element

bit size: 1

Values:

0:
Offline
1:
Online

Spare bits: 2

I019/553 - Reference Transponder Detailed Status

definition: Information concerning the configuration and status of the Reference Transponder.

Extended

I019/553/REFTR1 - Ref Trans 1 Status

Element

bit size: 2

Values:

1:
Warning
2:
Faulted
3:
Good

Spare bits: 2

I019/553/REFTR2 - Ref Trans 2 Status

Element

bit size: 2

Values:

1:
Warning
2:
Faulted
3:
Good

Spare bits: 1

(FX) - extension bit

I019/553/REFTR3 - Ref Trans 3 Status

Element

bit size: 2

Values:

1:
Warning
2:
Faulted
3:
Good

Spare bits: 2

I019/553/REFTR4 - Ref Trans 4 Status

Element

bit size: 2

Values:

1:
Warning
2:
Faulted
3:
Good

Spare bits: 1

(FX) - extension bit

I019/600 - Position of the MLT System Reference Point

definition: Position of the MLT reference point in WGS-84 Coordinates.

Group

I019/600/LAT - Latitude

Element

bit size: 32

Signed quantity

LSB = 180/230 ° ≈ 1.676380634307861328125e − 7 °

unit: "°"

>= −90.0

<= 90.0

I019/600/LON - Longitude

Element

bit size: 32

Signed quantity

LSB = 180/230 ° ≈ 1.676380634307861328125e − 7 °

unit: "°"

>= −180.0

< 180.0

I019/610 - Height of the MLT System Reference Point

definition: Height of the MLT system reference point in two’s complement form. The height shall use mean sea level as the zero reference level.

Element

bit size: 16

Signed quantity

LSB = 1/22 m ≈ 0.25 m

unit: "m"

>= −8192.0

<= 8192.0

I019/620 - WGS-84 Undulation

definition: WGS-84 undulation value of the MLT system reference point, in meters. Geoid undulation value is the difference between the ellipsoidal height and the height above mean sea level

Element

bit size: 8

Signed quantity

LSB = 1 m ≈ 1.0 m

unit: "m"

I019/RE - Reserved Expansion Field

definition: Expansion

Explicit (ReservedExpansion)

I019/SP - Special Purpose Field

definition: Special Purpose Field

Explicit (SpecialPurpose)

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