Asterix category 034 - Transmission of Monoradar Service Messages
category: 034
edition: 1.28
date: 2021-03-02
Preamble
Surveillance data exchange.
Description of standard data items
I034/000 - 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:
1: North marker message
2: Sector crossing message
3: Geographical filtering message
4: Jamming strobe message
5: Solar Storm Message
Notes:
In applications where transactions of various types are exchanged, the Message Type Data Item facilitates the proper message handling at the receiver side.
All Message Type values are reserved for common standard use.
The list of items present for the four message types is defined in the following table.
M stands for mandatory, O for optional, X for never present.
TODO: message types table
I034/010 - Data Source Identifier
Definition: Identification of the radar station from which the data are received.
Structure:
I034/010/SAC - System Area Code
- 8 bits [
........
]- raw value
I034/010/SIC - System Identification Code
- 8 bits [
........
]- raw value
- Note:
-
- The up-to-date list of SACs is published on the EUROCONTROL Web Site (http://www.eurocontrol.int/asterix).
I034/020 - Sector Number
Definition: Eight most significant bits of the antenna azimuth defining a particular azimuth sector.
Structure:
- 8 bits [
........
] - unsigned quantity
- unit: “°”
- LSB = 360/28 ° ≈ 1.41 °
I034/030 - 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
Notes:
- The time of day value is reset to zero each day at midnight.
I034/041 - Antenna Rotation Speed
Definition: Antenna rotation period as measured between two consecutive North crossings or as averaged during a period of time.
Structure:
- 16 bits [
................
] - unsigned quantity
- unit: “s”
- LSB = 1/27 s ≈ 7.81e − 3 s
Notes:
- This item represents the antenna rotation period as measured by the radar station between two consecutive North crossings, or a calculated antenna rotation speed as averaged during a period of time, or during a number of antenna rotation scans.
I034/050 - System Configuration and Status
Definition: Information concerning the configuration and status of a System.
Structure:
Compound item (FX)
I034/050/COM - Common Part
I034/050/COM/NOGO - Operational Release Status of the System
1 bit [
.
]values:
0: System is released for operational use
1: Operational use of System is inhibited, i.e. the data shall be discarded by an operational SDPSI034/050/COM/RDPC - Radar Data Processor Chain Selection Status
1 bit [
.
]values:
0: RDPC-1 selected
1: RDPC-2 selectedI034/050/COM/RDPR - Event to Signal a Reset/restart of the Selected Radar Data Processor Chain, I.e. Expect a New Assignment of Track Numbers
1 bit [
.
]values:
0: Default situation
1: Reset of RDPCI034/050/COM/OVLRDP - Radar Data Processor Overload Indicator
1 bit [
.
]values:
0: Default, no overload
1: Overload in RDPI034/050/COM/OVLXMT - Transmission Subsystem Overload Status
1 bit [
.
]values:
0: Default, no overload
1: Overload in transmission subsystemI034/050/COM/MSC - Monitoring System Connected Status
1 bit [
.
]values:
0: Monitoring system connected
1: Monitoring system disconnectedI034/050/COM/TSV - Time Source Validity
1 bit [
.
]values:
0: Valid
1: InvalidI034/050/COM/(spare)
- 1 bit [
.
]
(empty subitem)
(empty subitem)
I034/050/PSR - Specific Status Information for a PSR Sensor
I034/050/PSR/ANT - Selected Antenna
1 bit [
.
]values:
0: Antenna 1
1: Antenna 2I034/050/PSR/CHAB - Channel A/B Selection Status
2 bits [
..
]values:
0: No channel selected
1: Channel A only selected
2: Channel B only selected
3: Diversity mode ; Channel A and B selectedI034/050/PSR/OVL - Overload Condition
1 bit [
.
]values:
0: No overload
1: OverloadI034/050/PSR/MSC - Monitoring System Connected Status
1 bit [
.
]values:
0: Monitoring system connected
1: Monitoring system disconnectedI034/050/PSR/(spare)
- 3 bits [
...
]I034/050/SSR - Specific Status Information for a SSR Sensor
I034/050/SSR/ANT - Selected Antenna
1 bit [
.
]values:
0: Antenna 1
1: Antenna 2I034/050/SSR/CHAB - Channel A/B Selection Status
2 bits [
..
]values:
0: No channel selected
1: Channel A only selected
2: Channel B only selected
3: Invalid combinationI034/050/SSR/OVL - Overload Condition
1 bit [
.
]values:
0: No overload
1: OverloadI034/050/SSR/MSC - Monitoring System Connected Status:
1 bit [
.
]values:
0: Monitoring system connected
1: Monitoring system disconnectedI034/050/SSR/(spare)
- 3 bits [
...
]I034/050/MDS - Specific Status Information for a Mode S Sensor
I034/050/MDS/ANT - Selected Antenna
1 bit [
.
]values:
0: Antenna 1
1: Antenna 2I034/050/MDS/CHAB - Channel A/B Selection Status
2 bits [
..
]values:
0: No channel selected
1: Channel A only selected
2: Channel B only selected
3: Illegal combinationI034/050/MDS/OVLSUR - Overload Condition
1 bit [
.
]values:
0: No overload
1: OverloadI034/050/MDS/MSC - Monitoring System Connected Status:
1 bit [
.
]values:
0: Monitoring system connected
1: Monitoring system disconnectedI034/050/MDS/SCF - Channel A/B Selection Status for Surveillance Co-ordination Function
1 bit [
.
]values:
0: Channel A in use
1: Channel B in useI034/050/MDS/DLF - Channel A/B Selection Status for Data Link Function
1 bit [
.
]values:
0: Channel A in use
1: Channel B in useI034/050/MDS/OVLSCF - Overload in Surveillance Co-ordination Function
1 bit [
.
]values:
0: No overload
1: OverloadI034/050/MDS/OVLDLF - Overload in Data Link Function
1 bit [
.
]values:
0: No overload
1: OverloadI034/050/MDS/(spare)
- 7 bits [
.......
]
I034/060 - System Processing Mode
Definition: Status concerning the processing options, in use during the last antenna revolution, for the various Sensors, composing the System.
Structure:
Compound item (FX)
I034/060/COM - Common Part
I034/060/COM/(spare)
- 1 bit [
.
]I034/060/COM/REDRDP - Reduction Steps in Use for An Overload of the RDP
3 bits [
...
]values:
0: No reduction active
1: Reduction step 1 active
2: Reduction step 2 active
3: Reduction step 3 active
4: Reduction step 4 active
5: Reduction step 5 active
6: Reduction step 6 active
7: Reduction step 7 activeI034/060/COM/REDXMT - Reduction Steps in Use for An Overload of the Transmission Subsystem
3 bits [
...
]values:
0: No reduction active
1: Reduction step 1 active
2: Reduction step 2 active
3: Reduction step 3 active
4: Reduction step 4 active
5: Reduction step 5 active
6: Reduction step 6 active
7: Reduction step 7 activeI034/060/COM/(spare)
- 1 bit [
.
]
(empty subitem)
(empty subitem)
I034/060/PSR - Specific Processing Mode Information for a PSR Sensor
I034/060/PSR/POL - Polarization in Use by PSR
1 bit [
.
]values:
0: Linear polarization
1: Circular polarizationI034/060/PSR/REDRAD - Reduction Steps in Use as Result of An Overload Within the PSR Subsystem
3 bits [
...
]values:
0: No reduction active
1: Reduction step 1 active
2: Reduction step 2 active
3: Reduction step 3 active
4: Reduction step 4 active
5: Reduction step 5 active
6: Reduction step 6 active
7: Reduction step 7 activeI034/060/PSR/STC - Sensitivity Time Control Map in Use
2 bits [
..
]values:
0: STC Map-1
1: STC Map-2
2: STC Map-3
3: STC Map-4I034/060/PSR/(spare)
- 2 bits [
..
]I034/060/SSR - Specific Processing Mode Information for a SSR Sensor
I034/060/SSR/REDRAD - Reduction Steps in Use as Result of An Overload Within the SSR Subsystem
3 bits [
...
]values:
0: No reduction active
1: Reduction step 1 active
2: Reduction step 2 active
3: Reduction step 3 active
4: Reduction step 4 active
5: Reduction step 5 active
6: Reduction step 6 active
7: Reduction step 7 activeI034/060/SSR/(spare)
- 5 bits [
.....
]I034/060/MDS - Specific Processing Mode Information for a Mode S Sensor
I034/060/MDS/REDRAD - Reduction Steps in Use as Result of An Overload Within the Mode S Subsystem
3 bits [
...
]values:
0: No reduction active
1: Reduction step 1 active
2: Reduction step 2 active
3: Reduction step 3 active
4: Reduction step 4 active
5: Reduction step 5 active
6: Reduction step 6 active
7: Reduction step 7 activeI034/060/MDS/CLU - Cluster State
1 bit [
.
]values:
0: Autonomous
1: Not autonomousI034/060/MDS/(spare)
- 4 bits [
....
]
Notes:
- Applicable to all defined secondary subfields. The actual mapping between the up to seven data reduction steps and their associated data reduction measures is not subject to standardisation.
I034/070 - Message Count Values
Definition: Message Count values, according the various types of messages, for the last completed antenna revolution, counted between two North crossings
Structure:
Repetitive item, repetition factor 8 bits.
I034/070/TYP - Type of Message Counter
5 bits [
.....
]values:
0: No detection (number of misses)
1: Single PSR target reports
2: Single SSR target reports (Non-Mode S)
3: SSR+PSR target reports (Non-Mode S)
4: Single All-Call target reports (Mode S)
5: Single Roll-Call target reports (Mode S)
6: All-Call + PSR (Mode S) target reports
7: Roll-Call + PSR (Mode S) target reports
8: Filter for Weather data
9: Filter for Jamming Strobe
10: Filter for PSR data
11: Filter for SSR/Mode S data
12: Filter for SSR/Mode S+PSR data
13: Filter for Enhanced Surveillance data
14: Filter for PSR+Enhanced Surveillance
15: Filter for PSR+Enhanced Surveillance + SSR/Mode S data not in Area of Prime Interest
16: Filter for PSR+Enhanced Surveillance + all SSR/Mode S data
17: Re-Interrogations (per sector)
18: BDS Swap and wrong DF replies(per sector)
19: Mode A/C FRUIT (per sector)
20: Mode S FRUIT (per sector)I034/070/COUNT - COUNTER
- 11 bits [
...........
]- unsigned integer
I034/090 - Collimation Error
Definition: Averaged difference in range and in azimuth for the primary target position with respect to the SSR target position as calculated by the radar station.
Structure:
I034/090/RNG - Range Error
- 8 bits [
........
]- signed quantity
- unit: “NM”
- LSB = 1/27 NM ≈ 7.81e − 3 NM
I034/090/AZM - Azimuth Error
- 8 bits [
........
]- signed quantity
- unit: “°”
- LSB = 360/214 ° ≈ 2.20e − 2 °
Notes:
- Negative values are coded in two’s complement form.
I034/100 - Generic Polar Window
Definition: Geographical window defined in polar co-ordinates.
Structure:
I034/100/RHOST - Rho Start
- 16 bits [
................
]- unsigned quantity
- unit: “NM”
- LSB = 1/28 NM ≈ 3.91e − 3 NM
- value < = 256 NM
I034/100/RHOEND - Rho End
- 16 bits [
................
]- unsigned quantity
- unit: “NM”
- LSB = 1/28 NM ≈ 3.91e − 3 NM
- value < = 256 NM
I034/100/THETAST - Theta Start
- 16 bits [
................
]- unsigned quantity
- unit: “°”
- LSB = 360/216 ° ≈ 5.49e − 3 °
I034/100/THETAEND - Theta End
- 16 bits [
................
]- unsigned quantity
- unit: “°”
- LSB = 360/216 ° ≈ 5.49e − 3 °
I034/110 - Data Filter
Definition: Data Filter, which allows suppression of individual data types.
Structure:
8 bits [
........
]values:
0: Invalid value
1: Filter for Weather data
2: Filter for Jamming Strobe
3: Filter for PSR data
4: Filter for SSR/Mode S data
5: Filter for SSR/Mode S + PSR data
6: Enhanced Surveillance data
7: Filter for PSR+Enhanced Surveillance data
8: Filter for PSR+Enhanced Surveillance + SSR/Mode S data not in Area of Prime Interest
9: Filter for PSR+Enhanced Surveillance + all SSR/Mode S data
Notes:
- This Data Item is often used in conjunction with I034/100 and represents a Data Filter for a specific geographical subarea. A Data Source may have zero, one or multiple data filters active at any time.
- If I034/110 is not accompanied with I034/100, then the Data Filter is valid throughout the total area of coverage.
I034/120 - 3D-Position Of Data Source
Definition: 3D-Position of Data Source in WGS 84 Co-ordinates
Structure:
I034/120/HGT - Height of Data Source
- 16 bits [
................
]- signed quantity
- unit: “m”
- LSB = 1 m
I034/120/LAT - Latitude
- 24 bits [
........................
]- signed quantity
- unit: “°”
- LSB = 180/223 ° ≈ 2.15e − 5 °
- value > = − 90 °
- value < = 90 °
I034/120/LON - Longitude
- 24 bits [
........................
]- signed quantity
- unit: “°”
- LSB = 180/223 ° ≈ 2.15e − 5 °
- value > = − 180 °
- value < = 180 °
I034/RE - Reserved Expansion Field
Definition: Expansion
Structure:
Explicit item (RE)
I034/SP - Special Purpose Field
Definition: Special Purpose Field
Structure:
Explicit item (SP)
User Application Profile for Category 034
I034/010
- Data Source Identifier
I034/000
- Message Type
I034/030
- Time of Day
I034/020
- Sector Number
I034/041
- Antenna Rotation Speed
I034/050
- System Configuration and Status
I034/060
- System Processing Mode
(FX)
- Field extension indicatorI034/070
- Message Count Values
I034/100
- Generic Polar Window
I034/110
- Data Filter
I034/120
- 3D-Position Of Data Source
I034/090
- Collimation Error
I034/RE
- Reserved Expansion Field
I034/SP
- Special Purpose Field
(FX)
- Field extension indicator