Asterix category 009 - Composite Weather Reports
category: 009
edition: 2.1
date: 2014-10-22
Preamble
Surveillance data exchange.
Description of standard data items
I009/000 - 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 transaction.
Structure:
8 bits [
........]values:
2: Cartesian vector
253: Intermediate-update-step message
254: Start-of-picture message
255: End-of-picture message
I009/010 - Data Source Identifier
Definition: Identification of the radar station from which the data are received.
Structure:
I009/010/SAC - System Area Code
- 8 bits [
........]- raw value
I009/010/SIC - System Identification Code
- 8 bits [
........]- raw value
- Note:
-
The defined SACs are on the EUROCONTROL ASTERIX website (www.eurocontrol.int/asterix)
I009/020 - Vector Qualifier
Definition: This Data Item defines the orientation of the following sequence of Cartesian vectors, their intensity level and the relevant coordinate system.
Structure:
Extended item.
I009/020/ORG
1 bit [
.]values:
0: Local Coordinates
1: System CoordinatesI009/020/I - Intensity Level
- 3 bits [
...]- unsigned integer
I009/020/S - Shading Orientation with Respect to North
3 bits [
...]values:
0: 0°
1: 22.5°
2: 45°
3: 67.5°
4: 90°
5: 112.5°
6: 135°
7: 157.5°
(FX)
extension bit
0: End of data item
1: Extension into next extent
For polar vectors “S-bits” are meaningless and shall be set to zero.
I009/030 - Sequence of Cartesian Vectors
Definition: Sequence of weather vectors in local or system Cartesian coordinates.
Structure:
Repetitive item, repetition factor 8 bits.
I009/030/X - X-coordinate
16 bits [
................]signed quantity
unit: “(NM)”
LSB = 1/26 (NM) ≈ 1.56e − 2 (NM)
- remark
Adjust with scaling factor ‘080/F’
I009/030/Y - Y-coordinate
16 bits [
................]signed quantity
unit: “(NM)”
LSB = 1/26 (NM) ≈ 1.56e − 2 (NM)
- remark
Adjust with scaling factor ‘080/F’
I009/030/L - Vector Length
16 bits [
................]unsigned quantity
unit: “(NM)”
LSB = 1/26 (NM) ≈ 1.56e − 2 (NM)
- remark
Adjust with scaling factor ‘080/F’
‘F’ shall be incorporated as a parameter in the SOP message.
I009/060 - Synchronisation/Control Signal
Definition: This Data Item provides the serial Step Number.
Structure:
Extended item.
I009/060/SN - Step Number
- 6 bits [
......]- unsigned integer
I009/060/(spare)
- 1 bit [
.]
(FX)
extension bit
0: End of data item
1: Extension into next extent
I009/070 - Time of Day
Definition: Absolute time stamping expressed as UTC time.
Structure:
- 24 bits [
........................] - unsigned quantity
- unit: “s”
- LSB = 1/27 s ≈ 7.81e − 3 s
The time of day value is reset to zero each day at midnight.
I009/080 - Processing Status
Definition: Processing status of the Track Server.
Structure:
Extended item.
I009/080/F - Scaling Factor
- 5 bits [
.....]- signed integer
I009/080/R - Current Reduction Stage in Use
- 3 bits [
...]- raw value
I009/080/Q - Processing Parameters
- 15 bits [
...............]- raw value
(FX)
extension bit
0: End of data item
1: Extension into next extent
I009/090 - Radar Configuration and Status
Definition: Current radar configuration and status of all operational radars.
Structure:
Repetitive item, repetition factor 8 bits.
I009/090/SAC - SAC of Radar Concerned
- 8 bits [
........]- raw value
I009/090/SIC - SIC of Radar Concerned
- 8 bits [
........]- raw value
I009/090/(spare)
- 3 bits [
...]I009/090/CP - Circular Polarisation
- 1 bit [
.]- raw value
I009/090/WO - Weather Channel Overload
- 1 bit [
.]- raw value
I009/090/R - Reduction Step in Use By Radar Concerned
- 3 bits [
...]- raw value
I009/100 - Vector Count
Definition: Total number of vectors defining a complete weather picture.
Structure:
- 16 bits [
................] - unsigned integer
User Application Profile for Category 009
I009/010- Data Source Identifier
I009/000- Message Type
I009/020- Vector Qualifier
I009/030- Sequence of Cartesian Vectors
I009/060- Synchronisation/Control Signal
I009/070- Time of Day
I009/080- Processing Status
(FX)- Field extension indicatorI009/090- Radar Configuration and Status
I009/100- Vector Count
(spare)
(spare)
(spare)
(spare)
(spare)
(FX)- Field extension indicator