asterix 020 "Multilateration Target Reports" edition 1.10 date 2021-02-19 preamble Surveillance data exchange. items 010 "Data Source Identifier" definition Identification of the system from which the data are received group SAC "System Area Code" element 8 raw SIC "System Identification Code" element 8 raw remark Note: - The up-to-date list of SACs is published on the EUROCONTROL Web Site (http://www.eurocontrol.int/asterix). 020 "Target Report Descriptor" definition Type and characteristics of the data as transmitted by a system. extended SSR "" element 1 table 0: Non-Mode S 1090MHz multilateration 1: No Non-Mode S 1090MHz multilat MS "" element 1 table 0: Mode-S 1090 MHz multilateration 1: No Mode-S 1090 MHz multilateration HF "" element 1 table 0: HF multilateration 1: No HF multilateration VDL4 "" element 1 table 0: VDL Mode 4 multilateration 1: No VDL Mode 4 multilateration UAT "" element 1 table 0: UAT multilateration 1: No UAT multilateration DME "" element 1 table 0: DME/TACAN multilateration 1: No DME/TACAN multilateration OT "" element 1 table 0: Other Technology Multilateration 1: No Other Technology Multilateration - RAB "" element 1 table 0: Report from target transponder 1: Report from field monitor (element transponder) SPI "" element 1 table 0: Absence of SPI 1: Special Position Identification CHN "" element 1 table 0: Chain 1 1: Chain 2 GBS "" element 1 table 0: Transponder Ground bit not set 1: Transponder Ground bit set CRT "" element 1 table 0: No Corrupted reply in multilateration 1: Corrupted replies in multilateration SIM "" element 1 table 0: Actual target report 1: Simulated target report TST "" element 1 table 0: Default 1: Test Target - 030 "Warning/Error Conditions" definition Warning/error conditions detected by a system for the target report involved. repetitive fx element 7 table 0: Not defined; never used 1: Multipath Reply (Reflection) 3: Split plot 10: Phantom SSR plot 11: Non-Matching Mode-3/A Code 12: Mode C code / Mode S altitude code abnormal value compared to the track 15: Transponder anomaly detected 16: Duplicated or Illegal Mode S Aircraft Address 17: Mode S error correction applied 18: Undecodable Mode C code / Mode S altitude code remark Notes: 1. It has to be stressed that a series of one or more W/E conditions can be reported per target report. 2. Data conveyed in this item are of secondary importance, and can generally also be derived from the processing of mandatory items. 3. Definitions can be found in SUR.ET1.ST03.1000-STD-01-01 Radar Sensor Performance Analysis. 4. The coding of Warning/Errors is kept consistent with category 048. 041 "Position In WGS-84 Coordinates" definition Position of a target in WGS-84 Coordinates. group LAT "Latitude" element 32 signed quantity 180/2^25 "°" >= -90 <= 90 LON "Longitude" element 32 signed quantity 180/2^25 "°" >= -180 < 180 042 "Position in Cartesian Coordinates" definition Calculated position in Cartesian Coordinates, in two’s complement representation. group X "X-coordinate" element 24 signed quantity 1/2 "m" >= -4194300 <= 4194300 Y "Y-coordinate" element 24 signed quantity 1/2 "m" >= -4194300 <= 4194300 050 "Mode-2 Code in Octal Representation" definition Mode-2 code converted into octal representation. group V "Validated" element 1 table 0: Code validated 1: Code not validated G "Garbled" element 1 table 0: Default 1: Garbled code L "" element 1 table 0: Mode-2 code derived from the reply of the transponder 1: Smoothed Mode-2 code as provided by a local tracker n spare 1 MODE2 "Mode-2 Reply in Octal Representation" element 12 string octal 055 "Mode-1 Code in Octal Representation" definition Mode-1 code converted into octal representation. group V "Validated" element 1 table 0: Code validated 1: Code not validated G "Garbled" element 1 table 0: Default 1: Garbled code L "" element 1 table 0: Mode-1 code derived from the reply of the transponder 1: Smoothed Mode-1 code as provided by a local tracker MODE1 "Mode-1 Code in Octal Representation" element 5 raw 070 "Mode-3/A Code in Octal Representation" definition Mode-3/A code converted into octal representation. group V "Validated" element 1 table 0: Code validated 1: Code not validated G "Garbled" element 1 table 0: Default 1: Garbled code L "" element 1 table 0: Mode-3/A code derived from the reply of the transponder 1: Mode-3/A code not extracted during the last update period spare 1 MODE3A "Mode-3/A Reply in Octal Representation" element 12 string octal remark Notes: 1. Bit 15 (G) is set to one when an error correction has been attempted. 2. Bit 16 (V) is normally set to zero, but can exceptionally be set to one to indicate a non-validated Mode-3/A code (e.g. alert condition detected, but new Mode-3/A code not successfully extracted). 090 "Flight Level in Binary Representation" definition Flight Level (Mode S Altitude) converted into binary two's complement representation. group V "Validated" element 1 table 0: Code validated 1: Code not validated G "Garbled" element 1 table 0: Default 1: Garbled code FL "Flight Level" element 14 signed quantity 1/2^2 "FL" remark Notes: 1. When Mode C code / Mode S altitude code is present but not decodable, the “Undecodable Mode C code / Mode S altitude code” Warning/Error should be sent in I020/030. 2. When local tracking is applied and the received Mode S altitude code corresponds to an abnormal value (i.e: the difference in altitude between the current and the previous plot exceeds a predefined system threshold), the “Mode C code / Mode S altitude code abnormal value compared to the track“ Warning/Error should be sent in I020/030. 3. The value shall be within the range described by ICAO Annex 10 4. For Mode S, bit 15 (G) is set to one when an error correction has been attempted. 100 "Mode C Code" definition Mode-C height in Gray notation as received from the transponder together with the confidence level for each reply bit as provided by a MSSR/Mode-S station. group V "Validated" element 1 table 0: Code validated 1: Code not validated G "Garbled" element 1 table 0: Default 1: Garbled code spare 2 MODEC "Mode-C Reply in Gray Notation" element 12 raw spare 4 QC1 "Quality Pulse C1" element 1 table 0: High quality pulse C1 1: Low quality pulse C1 QA1 "Quality Pulse A1" element 1 table 0: High quality pulse A1 1: Low quality pulse A1 QC2 "Quality Pulse C2" element 1 table 0: High quality pulse C2 1: Low quality pulse C2 QA2 "Quality Pulse A2" element 1 table 0: High quality pulse A2 1: Low quality pulse A2 QC4 "Quality Pulse C4" element 1 table 0: High quality pulse C4 1: Low quality pulse C4 QA4 "Quality Pulse A4" element 1 table 0: High quality pulse A4 1: Low quality pulse A4 QB1 "Quality Pulse B1" element 1 table 0: High quality pulse B1 1: Low quality pulse B1 QD1 "Quality Pulse D1" element 1 table 0: High quality pulse D1 1: Low quality pulse D1 QB2 "Quality Pulse B2" element 1 table 0: High quality pulse B2 1: Low quality pulse B2 QD2 "Quality Pulse D2" element 1 table 0: High quality pulse B2 1: Low quality pulse B2 QB4 "Quality Pulse B4" element 1 table 0: High quality pulse B4 1: Low quality pulse B4 QD4 "Quality Pulse D4" element 1 table 0: High quality pulse D4 1: Low quality pulse D4 remark Notes: 1. For Mode S, bit 31 (G) is set to one when an error correction has been attempted. 2. For Mode S, D1 is also designated as Q, and is used to denote either 25ft or 100ft reporting. 105 "Geometric Height (WGS-84)" 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. element 16 signed quantity 25/2^2 "ft" >= -204800 <= 204800 110 "Measured Height (Local Cartesian Coordinates)" definition Height above local 2D co-ordinate system in reference to the MLT System Reference Point as defined in item I019/610, in two’s complement form, based on a direct measurement not related to barometric pressure. element 16 signed quantity 25/2^2 "ft" >= -204800 <= 204800 140 "Time of Day" definition Absolute time stamping expressed as UTC. element 24 unsigned quantity 1/2^7 "s" 161 "Track Number" definition An integer value representing a unique reference to a track record within a particular track file. group spare 4 TRN "Track Number" element 12 raw 170 "Track Status" definition Status of a track. extended CNF "" element 1 table 0: Confirmed track 1: Track in initiation phase TRE "" element 1 table 0: Default 1: Last report for a track CST "" element 1 table 0: Not Coasted 1: Coasted CDM "" element 2 table 0: Maintaining 1: Climbing 2: Descending 3: Invalid MAH "" element 1 table 0: Default 1: Horizontal manoeuvre STH "" element 1 table 0: Measured position 1: Smoothed position - GHO "" element 1 table 0: Default 1: Ghost track spare 6 - remark Notes: 1. Bit-8 (GHO) is used to signal that the track is suspected to have been generated by a fake target. 202 "Calculated Track Velocity in Cartesian Coordinates" definition Calculated track velocity expressed in Cartesian Coordinates, in two’s complement representation. group VX "" element 16 signed quantity 1/2^2 "m/s" >= -8192 <= 8192 VY "" element 16 signed quantity 1/2^2 "m/s" >= -8192 <= 8192 210 "Calculated Acceleration" definition Calculated Acceleration of the target, in two’s complement form. group AX "" element 8 signed quantity 1/2^2 "m/s²" >= -31 <= 31 AY "" element 8 signed quantity 1/2^2 "m/s²" >= -31 <= 31 remark Notes: 1. Maximum value means "maximum value or above" 220 "Target Address" definition Target address (24-bit address) assigned to each Target. element 24 raw remark Note: The type of address (ICAO or non-ICAO address, type of message) is defined by the CF-indication in Data Item I020/020, second extension, bits 8/7. 230 "Communications/ACAS Capability and Flight Status" definition Communications capability of the transponder, capability of the on-board ACAS equipment and flight status. group COM "Communications Capability of the Transponder" element 3 table 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: Not assigned 6: Not assigned 7: Not assigned STAT "Flight Status" element 3 table 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 assigned 7: Information not yet extracted spare 2 MSSC "Mode-S Specific Service Capability" element 1 table 0: No 1: Yes ARC "Altitude Reporting Capability" element 1 table 0: 100 ft resolution 1: 25 ft resolution AIC "Aircraft Identification Capability" element 1 table 0: No 1: Yes B1A "BDS 1,0 Bit 16" element 1 raw B1B "BDS 1,0 Bits 37/40" element 4 raw 245 "Target Identification" definition Target (aircraft or vehicle) identification in 8 characters. group STI "" element 2 table 0: Callsign or registration not downlinked from transponder 1: Registration downlinked from transponder 2: Callsign downlinked from transponder 3: Not defined spare 6 CHR "Characters 1-8 (coded on 6 Bits Each) Defining Target Identification" element 48 string icao remark Notes: 1. See ICAO document Annex 10, Volume IV, section 3.1.2.9 for the coding rules. 250 "BDS Register Data" definition Mode S Comm B data as extracted from the aircraft transponder. repetitive 8 group MBDATA "56-bit Message Conveying Mode S Comm B Message Data" element 56 raw BDS1 "Comm B Data Buffer Store 1 Address" element 4 raw BDS2 "Comm B Data Buffer Store 2 Address" element 4 raw remark Notes: 1. For the transmission of BDS20, item I020/245 is used. 2. For the transmission of BDS30, item I020/260 is used. 260 "ACAS Resolution Advisory Report" definition Currently active Resolution Advisory (RA), if any, generated by the ACAS associated with the transponder transmitting the report and threat identity data. element 56 raw remark Notes: Refer to ICAO Draft SARPs for ACAS for detailed explanations. 300 "Vehicle Fleet Identification" definition Vehicle fleet identification number. element 8 table 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) 310 "Pre-programmed Message" definition Number related to a pre-programmed message that can be transmitted by a vehicle. group TRB "" element 1 table 0: Default 1: In Trouble MSG "" element 7 table 1: Towing aircraft 2: FOLLOW-ME operation 3: Runway check 4: Emergency operation (fire, medical...) 5: Work in progress (maintenance, birds scarer, sweepers...) 400 "Contributing Devices" definition Overview of Receiver Units, which have contributed to the Target Detection. repetitive 8 group BIT1 "TU1/RU1 Contribution" element 1 table 0: TU1/RU1 has NOT contributed to the target detection 1: TU1/RU1 has contributed to the target detection BIT2 "TU2/RU2 Contribution" element 1 table 0: TU2/RU2 has NOT contributed to the target detection 1: TU2/RU2 has contributed to the target detection BIT3 "TU3/RU3 Contribution" element 1 table 0: TU3/RU3 has NOT contributed to the target detection 1: TU3/RU3 has contributed to the target detection BIT4 "TU4/RU4 Contribution" element 1 table 0: TU4/RU4 has NOT contributed to the target detection 1: TU4/RU4 has contributed to the target detection BIT5 "TU5/RU5 Contribution" element 1 table 0: TU5/RU5 has NOT contributed to the target detection 1: TU5/RU5 has contributed to the target detection BIT6 "TU6/RU6 Contribution" element 1 table 0: TU6/RU6 has NOT contributed to the target detection 1: TU6/RU6 has contributed to the target detection BIT7 "TU7/RU7 Contribution" element 1 table 0: TU7/RU7 has NOT contributed to the target detection 1: TU7/RU7 has contributed to the target detection BIT8 "TU8/RU8 Contribution" element 1 table 0: TU8/RU8 has NOT contributed to the target detection 1: TU8/RU8 has contributed to the target detection remark Note: In case of more than 8 devices connected to the system, the numbering of the field "RUx Contribution" follows the standard ASTERIX rule: bits are numbered from right to left. The example below shows the case of a maximum of 16 devices with devices 1, 7 and 14 contributing to the target: 500 "Position Accuracy" definition Standard Deviation of Position compound DOP "DOP of Position" group X "DOP (X-Component)" element 16 unsigned quantity 1/2^2 "" Y "DOP (Y-Component)" element 16 unsigned quantity 1/2^2 "" XY "DOP (Correlation XY)" element 16 unsigned quantity 1/2^2 "" SDP "Standard Deviation of Position" group X "SDP (X-Component)" element 16 unsigned quantity 1/2^2 "m" Y "SDP (Y-Component)" element 16 unsigned quantity 1/2^2 "m" XY "SDP (Correlation XY)" element 16 unsigned quantity 1/2^2 "" SDH "Standard Deviation of Geometric Height (WGS 84)" element 16 unsigned quantity 1/2 "m" remark Note: 1. There is now a new Item for the Position Accuracy defined in the Reserved Expansion Field (REF), more complete (includes a Standard Deviation of Position in WGS-84) and is based on a different calculation method (covariance instead of correlation). It is recommended to use the new definition. Nevertheless, Item I020/500 is kept in order to prevent a full incompatibility with previous releases of ASTERIX Cat. 020 already implemented. RE "Reserved Expansion Field" definition Expansion explicit re SP "Special Purpose Field" definition Special Purpose Field explicit sp uap 010 020 140 041 042 161 170 070 202 090 100 220 245 110 105 210 300 310 500 400 250 230 260 030 055 050 RE SP