asterix 048 "Monoradar Target Reports" edition 1.29 date 2021-08-10 preamble Surveillance data exchange. items 010 "Data Source Identifier" definition Identification of the radar station from which the data is 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 properties of the target report. extended TYP "" element 3 table 0: No detection 1: Single PSR detection 2: Single SSR detection 3: SSR + PSR detection 4: Single ModeS All-Call 5: Single ModeS Roll-Call 6: ModeS All-Call + PSR 7: ModeS Roll-Call +PSR SIM "" element 1 table 0: Actual target report 1: Simulated target report RDP "" element 1 table 0: Report from RDP Chain 1 1: Report from RDP Chain 2 SPI "" element 1 table 0: Absence of SPI 1: Special Position Identification RAB "" element 1 table 0: Report from aircraft transponder 1: Report from field monitor (fixed transponder) - TST "" element 1 table 0: Real target report 1: Test target report ERR "" element 1 table 0: No Extended Range 1: Extended Range present XPP "" element 1 table 0: No X-Pulse present 1: X-Pulse present ME "" element 1 table 0: No military emergency 1: Military emergency MI "" element 1 table 0: No military identification 1: Military identification FOEFRI "" element 2 table 0: No Mode 4 interrogation 1: Friendly target 2: Unknown target 3: No reply - remark Notes: 1. For Mode S aircraft, the SPI information is also contained in I048/230. 2. To bits 3/2 (FOE/FRI): IFF interrogators supporting a three level classification of the processing of the Mode 4 interrogation result shall encode the detailed response information in data item M4E of the Reserved Expansion Field of category 048. In this case the value for FOE/FRI in I048/020 shall be set to “00”. However, even those interrogators shall use I048/020 to encode the information “No reply”. 3. To bit 6 (XPP): This bit shall always be set when the X-pulse has been extracted, independent from the Mode it was extracted with. 4. To bit 7 (ERR): This bit set to “1” indicates that the range of the target is beyond the maximum range in data item I048/040.In this case – and this case only - the ERR Data Item in the Reserved Expansion Field shall provide the range value of the Measured Position in Polar Coordinates. 030 "Warning/Error Conditions and Target Classification" definition Warning/error conditions detected by a radar station for the target report involved. Target Classification information for the target involved. repetitive fx element 7 table 0: Not defined; never used 1: Multipath Reply (Reflection) 2: Reply due to sidelobe interrogation/reception 3: Split plot 4: Second time around reply 5: Angel 6: Slow moving target correlated with road infrastructure (terrestrial vehicle) 7: Fixed PSR plot 8: Slow PSR target 9: Low quality PSR 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 13: Target in Clutter Area 14: Maximum Doppler Response in Zero Filter 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 19: Birds 20: Flock of Birds 21: Mode-1 was present in original reply 22: Mode-2 was present in original reply 23: Plot potentially caused by Wind Turbine 24: Helicopter 25: Maximum number of re-interrogations reached (surveillance information) 26: Maximum number of re-interrogations reached (BDS Extractions) 27: BDS Overlay Incoherence 28: Potential BDS Swap Detected 29: Track Update in the Zenithal Gap 30: Mode S Track re-acquired 31: Duplicated Mode 5 Pair NO/PIN detected 32: Wrong DF reply format detected 33: Transponder anomaly (MS XPD replies with Mode A/C to Mode A/C-only all-call) 34: Transponder anomaly (SI capability report wrong) remark Notes: 1. It has to be stressed that a series of one or more codes 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. Values 25 to 30 have been defined to comply with the updated European Mode S Specification (EMS) and to provide the possibility to report the following information: - Code 25: the maximum number of permitted re-interrogations to acquire the surveillance information has been reached; - Code 26: the maximum number of permitted re-interrogations to extract BDS Registers has been reached; - Code 27: inconsistency detected between the contents of the message and the BDS register overlayed; - Code 28: a BDS swap has been detected and the respective information has been discarded; - Code 29: the track has been updated while being in the zenithal gap (also referred to as “Cone of Silence”); - Code 30: the radar had lost track of an aircraft and subsequently re-acquired it. 040 "Measured Position in Polar Co-ordinates" definition Measured position of an aircraft in local polar co-ordinates. group RHO "" element 16 unsigned quantity 1/2^8 "NM" < 256 THETA "" element 16 unsigned quantity 360/2^16 "°" remark Notes: 1. In case of no detection, the extrapolated position expressed in slant polar co-ordinates may be sent, except for a track cancellation message. No detection is signalled by the TYP field set to zero in I048/020 Target Report Descriptor. 2. This item represents the measured target position of the plot, even if associated with a track, for the present antenna scan. It is expressed in polar co-ordinates in the local reference system, centred on the radar station. 3. In case of combined detection by a PSR and an SSR, then the SSR position is sent. 4. For targets having a range beyond the maximum range the data item “Extended Range Report” has been added to the Reserved Expansion Field of category 048. The presence of this data item is indicated by the ERR bit set to one in data item I048/020, first extension. The ERR data item shall only be sent if the value of RHO is equal to or greater than 256NM. Please note that if this data item is used, the Encoding Rule to data item I048/040 still applies, meaning that the extra item in the Reserved Expansion Field shall be transmitted in addition to data item I048/040. If the Extended Range Report item in the Reserved Expansion Field is used, it is recommended to set the value of RHO in data item I048/040 to its maximum, meaning bits 32/17 all set to 1. 042 "Calculated Position in Cartesian Co-ordinates" definition Calculated position of an aircraft in Cartesian co-ordinates. group X "X-Component" element 16 signed quantity 1/2^7 "NM" >= -256 <= 256 Y "X-Component" element 16 signed quantity 1/2^7 "NM" >= -256 <= 256 050 "Mode-2 Code in Octal Representation" definition Reply to Mode-2 interrogation. group V "" element 1 table 0: Code validated 1: Code not validated G "" element 1 table 0: Default 1: Garbled code L "" element 1 table 0: Mode-2 code as derived from the reply of the transponder 1: Smoothed Mode-2 code as provided by a local tracker spare 1 MODE2 "Mode-2 Code in Octal Representation" element 12 string octal remark Notes: - Bit 15 has no meaning in the case of a smoothed Mode-2 and is set to 0 for a calculated track. 055 "Mode-1 Code in Octal Representation" definition Reply to Mode-1 interrogation. group V "" element 1 table 0: Code validated 1: Code not validated G "" element 1 table 0: Default 1: Garbled code L "" element 1 table 0: Mode-1 code as derived from the reply of the transponder 1: Smoothed Mode-1 code as provided by a local tracker MODE1 "Mode-1 Code" element 5 raw remark Notes: 1. Bit 7 has no meaning in the case of a smoothed Mode-1 and is set to 0 for a calculated track. 2. The values of the bits for V, G, L, A4, A2, A1, B2 and B1 shall be identical to the values of the corresponding bits in subfield #5 of data item “MD5 – Mode 5 Reports” and in subfield #5 of data item “MD5 – Mode 5 Reports, New Format” in the Reserved Expansion Field. 060 "Mode-2 Code Confidence Indicator" definition Confidence level for each bit of a Mode-2 reply as provided by a monopulse SSR station. group spare 4 QA4 "" element 1 table 0: High quality pulse A4 1: Low quality pulse A4 QA2 "" element 1 table 0: High quality pulse A2 1: Low quality pulse A2 QA1 "" element 1 table 0: High quality pulse A1 1: Low quality pulse A1 QB4 "" element 1 table 0: High quality pulse B4 1: Low quality pulse B4 QB2 "" element 1 table 0: High quality pulse B2 1: Low quality pulse B2 QB1 "" element 1 table 0: High quality pulse B1 1: Low quality pulse B1 QC4 "" element 1 table 0: High quality pulse C4 1: Low quality pulse C4 QC2 "" element 1 table 0: High quality pulse C2 1: Low quality pulse C2 QC1 "" element 1 table 0: High quality pulse C1 1: Low quality pulse C1 QD4 "" element 1 table 0: High quality pulse D4 1: Low quality pulse D4 QD2 "" element 1 table 0: High quality pulse D2 1: Low quality pulse D2 QD1 "" element 1 table 0: High quality pulse D1 1: Low quality pulse D1 065 "Mode-1 Code Confidence Indicator" definition Confidence level for each bit of a Mode-1 reply as provided by a monopulse SSR station. group spare 3 QA4 "" element 1 table 0: High quality pulse A4 1: Low quality pulse A4 QA2 "" element 1 table 0: High quality pulse A2 1: Low quality pulse A2 QA1 "" element 1 table 0: High quality pulse A1 1: Low quality pulse A1 QB2 "" element 1 table 0: High quality pulse B2 1: Low quality pulse B2 QB1 "" element 1 table 0: High quality pulse B1 1: Low quality pulse B1 070 "Mode-3/A Code in Octal Representation" definition Mode-3/A code converted into octal representation. group V "" element 1 table 0: Code validated 1: Code not validated G "" 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 scan spare 1 MODE3A "Mode-3/A Reply in Octal Representation" element 12 string octal remark Notes: 1. Bit 15 has no meaning in the case of a smoothed Mode-3/A code and is set to 0 for a calculated track. For Mode S, it is set to one when an error correction has been attempted. 2. For Mode S, bit 16 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). 080 "Mode-3/A Code Confidence Indicator" definition Confidence level for each bit of a Mode-3/A reply as provided by a monopulse SSR station. group spare 4 QA4 "" element 1 table 0: High quality pulse A4 1: Low quality pulse A4 QA2 "" element 1 table 0: High quality pulse A2 1: Low quality pulse A2 QA1 "" element 1 table 0: High quality pulse A1 1: Low quality pulse A1 QB4 "" element 1 table 0: High quality pulse B4 1: Low quality pulse B4 QB2 "" element 1 table 0: High quality pulse B2 1: Low quality pulse B2 QB1 "" element 1 table 0: High quality pulse B1 1: Low quality pulse B1 QC4 "" element 1 table 0: High quality pulse C4 1: Low quality pulse C4 QC2 "" element 1 table 0: High quality pulse C2 1: Low quality pulse C2 QC1 "" element 1 table 0: High quality pulse C1 1: Low quality pulse C1 QD4 "" element 1 table 0: High quality pulse D4 1: Low quality pulse D4 QD2 "" element 1 table 0: High quality pulse D2 1: Low quality pulse D2 QD1 "" element 1 table 0: High quality pulse D1 1: Low quality pulse D1 090 "Flight Level in Binary Representation" definition Flight Level converted into binary representation. group V "" element 1 table 0: Code validated 1: Code not validated G "" element 1 table 0: Default 1: Garbled code FL "" element 14 unsigned 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 I048/030. 2. When local tracking is applied and the received Mode C code / Mode S altitude code corresponds to an abnormal value (the variation with the previous plot is estimated too important by the tracker), the “Mode C code / Mode S altitude code abnormal value compared to the track“ Warning/Error should be sent in I048/030. 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 and Code Confidence Indicator" 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 "" element 1 table 0: Code validated 1: Code not validated G "" element 1 table 0: Default 1: Garbled code spare 2 MODEC "Mode-C Reply in Gray Notation" element 12 raw spare 4 QC1 "" element 1 table 0: High quality pulse C1 1: Low quality pulse C1 QA1 "" element 1 table 0: High quality pulse A1 1: Low quality pulse A1 QC2 "" element 1 table 0: High quality pulse C2 1: Low quality pulse C2 QA2 "" element 1 table 0: High quality pulse A2 1: Low quality pulse A2 QC4 "" element 1 table 0: High quality pulse C4 1: Low quality pulse C4 QA4 "" element 1 table 0: High quality pulse A4 1: Low quality pulse A4 QB1 "" element 1 table 0: High quality pulse B1 1: Low quality pulse B1 QD1 "" element 1 table 0: High quality pulse D1 1: Low quality pulse D1 QB2 "" element 1 table 0: High quality pulse B2 1: Low quality pulse B2 QD2 "" element 1 table 0: High quality pulse D2 1: Low quality pulse D2 QB4 "" element 1 table 0: High quality pulse B4 1: Low quality pulse B4 QD4 "" element 1 table 0: High quality pulse D4 1: Low quality pulse D4 remark Notes: 1. For Mode S, D1 is also designated as Q, and is used to denote either 25ft or 100ft reporting. 2. For Mode S, bit-31 (G) is set when an error correction has been attempted. 110 "Height Measured by a 3D Radar" definition Height of a target as measured by a 3D radar. The height shall use mean sea level as the zero reference level. group spare 2 3DH "3D Height, in Binary Notation. Negative Values Are Expressed in Two's Complement" element 14 signed quantity 25 "ft" 120 "Radial Doppler Speed" definition Information on the Doppler Speed of the target report. compound CAL "Calculated Doppler Speed" group D "" element 1 table 0: Doppler speed is valid 1: Doppler speed is doubtful spare 5 CAL "Calculated Doppler Speed, Coded in Two's Complement" element 10 signed quantity 1 "m/s" RDS "Raw Doppler Speed" repetitive 8 group DOP "Doppler Speed" element 16 unsigned quantity 1 "m/s" AMB "Ambiguity Range" element 16 unsigned quantity 1 "m/s" FRQ "Transmitter Frequency" element 16 unsigned quantity 1 "MHz" 130 "Radar Plot Characteristics" definition Additional information on the quality of the target report. compound SRL "SSR Plot Runlength" description SSR plot runlength, expressed as a positive binary value. element 8 unsigned quantity 360/2^13 "°" SRR "Number of Received Replies for (M)SSR" description Number of Received Replies for (M)SSR element 8 unsigned integer SAM "Amplitude of (M)SSR Reply" description Amplitude of (M)SSR Reply element 8 signed quantity 1 "dBm" PRL "Primary Plot Runlength" description Primary Plot Runlength, expressed as positive binary value element 8 unsigned quantity 360/2^13 "°" PAM "Amplitude of Primary Plot" description Amplitude of Primary Plot element 8 signed quantity 1 "dBm" RPD "Difference in Range Between PSR and SSR Plot" description Range (PSR-SSR) element 8 signed quantity 1/2^8 "NM" APD "Difference in Azimuth Between PSR and SSR Plot" description Azimuth (PSR-SSR) element 8 signed quantity 360/2^14 "°" remark Notes: 1. The total range covered is therefore from 0 to 11.21 °. 2. Negative values are coded in two's complement form. 3. The total range covered is therefore from 0 to 11.21 °. 4. Negative values are coded in two's complement form. 5. Negative values are coded in two's complement form. 6. The covered range difference is +/- 0.5 NM. 7. Sending the maximum value means that the difference in range is equal or greater than the maximum value. 8. Negative values are coded in two's complement form. 9. The covered azimuth difference is +/-360/2 7 = +/- 2.8125 °. 10. Sending the maximum value means that the difference in range is equal or greater than the maximum value. 140 "Time of Day" definition Absolute time stamping expressed as Co-ordinated Universal Time (UTC). element 24 unsigned quantity 1/2^7 "s" < 86400 remark Notes: 1. The time of day value is reset to 0 each day at midnight. 2. Every radar station using ASTERIX should be equipped with at least one synchronised time source 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 monoradar track (PSR and/or SSR updated). extended CNF "Confirmed Vs. Tentative Track" element 1 table 0: Confirmed Track 1: Tentative Track RAD "Type of Sensor(s) Maintaining Track" element 2 table 0: Combined Track 1: PSR Track 2: SSR/Mode S Track 3: Invalid DOU "Signals Level of Confidence in Plot to Track Association Process" element 1 table 0: Normal confidence 1: Low confidence in plot to track association MAH "Manoeuvre Detection in Horizontal Sense" element 1 table 0: No horizontal man.sensed 1: Horizontal man. sensed CDM "Climbing / Descending Mode" element 2 table 0: Maintaining 1: Climbing 2: Descending 3: Unknown - TRE "Signal for End_of_Track" element 1 table 0: Track still alive 1: End of track lifetime(last report for this track) GHO "Ghost Vs. True Target" element 1 table 0: True target track 1: Ghost target track SUP "Track Maintained with Track Information from Neighbouring Node B on the Cluster, or Network" element 1 table 0: No 1: Yes TCC "Type of Plot Coordinate Transformation Mechanism:" element 1 table 0: Tracking performed in so-called 'Radar Plane', i.e. neither slant range correction nor stereographical projection was applied 1: Slant range correction and a suitable projection technique are used to track in a 2D.reference plane, tangential to the earth model at the Radar Site co-ordinates spare 3 - 200 "Calculated Track Velocity in Polar Co-ordinates" definition Calculated track velocity expressed in polar co-ordinates. group GSP "Calculated Groundspeed" element 16 unsigned quantity 1/2^14 "NM/s" HDG "Calculated Heading" element 16 unsigned quantity 360/2^16 "°" remark Notes: - The calculated heading is related to the geographical North at the aircraft position. 210 "Track Quality" definition Track quality in the form of a vector of standard deviations. group SIGX "Sigma (X)) Standard Deviation on the Horizontal Axis of the Local Grid System" element 8 unsigned quantity 1/2^7 "NM" SIGY "Sigma (Y)) Standard Deviation on the Vertical Axis of the Local Grid System" element 8 unsigned quantity 1/2^7 "NM" SIGV "Sigma (V)) Standard Deviation on the Groundspeed Within the Local Grid System" element 8 unsigned quantity 1/2^14 "NM/s" SIGH "Sigma (H)) Standard Deviation on the Heading Within the Local Grid System" element 8 unsigned quantity 360/2^12 "°" remark Notes: 1. The standard deviation is per definition a positive value, hence the range covered is : 0<= Sigma(X)<2 NM 2. The standard deviation is per definition a positive value, hence the range covered is : 0<= Sigma(Y)<2 NM 3. The standard deviation is per definition a positive value, hence the range covered is: 0<=Sigma (V)<56.25 Kt 4. The standard deviation is per definition a positive value; hence the range covered is: 0 <= sigma (H) < 22.5 degrees. 220 "Aircraft Address" definition Aircraft address (24-bits Mode S address) assigned uniquely to each aircraft. element 24 raw 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 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 7: Unknown SI "SI/II Transponder Capability" element 1 table 0: SI-Code Capable 1: II-Code Capable spare 1 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 240 "Aircraft Identification" definition Aircraft identification (in 8 characters) obtained from an aircraft equipped with a Mode S transponder. element 48 string icao remark Notes: - This data item contains the flight identification as available in the respective Mode S transponder registers. 250 "BDS Register Data" definition BDS Register Data as extracted from the aircraft transponder. repetitive 8 group MBDATA "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 240 is used. 2. For the transmission of BDS30, item 260 is used. In case of ACAS Xu (as defined in [3]), the Resolution Advisory consists of two parts (BDS30 and BDS31). BDS31 will be transmitted using Data Item I048/250. For the detailed definition of BDS30 and BDS31 refer to [2] Tables B-3-48a and B-3-49. 3. In case of data extracted via Comm-B broadcast, all bits of fields BDS1 and BDS2 are set to 0; in case of data extracted via GICB requests, the fields BDS1 and BDS2 correspond to the GICB register number. 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: 1. Refer to ICAO Draft SARPs for ACAS for detailed explanations. 2. In case of ACAS Xu, the Resolution Advisory consists of two parts (BDS30 and BDS31). BDS31 will be transmitted using item 250. RE "Reserved Expansion Field" definition Expansion explicit re SP "Special Purpose Field" definition Special Purpose Field explicit sp uap 010 140 020 040 070 090 130 220 240 250 161 042 200 170 210 030 080 100 110 120 230 260 055 050 065 060 SP RE