asterix 001 "Transmission of Monoradar Data Target Reports" edition 1.2 date 2011-08-01 preamble Surveillance data exchange. items 010 "Data Source Identifier" definition Identification of the radar station from which the data are received. group SAC "System Area Code" element 8 raw SIC "System Identification Code" element 8 raw remark Note: 1 The defined SACs are listed in Part 1, Table 2. [Ref.2 ] 2 The defined SICs are listed in Part 1, Annex B. [Ref.2 ] 020 "Target Report Descriptor" definition Type and characteristics of the radar data as transmitted by a radar station. extended TYP "" element 1 table 0: Plot 1: Track SIM "" element 1 table 0: Actual plot or track 1: Simulated plot or track SSRPSR "Radar Detection in Last Antenna Scan" element 2 table 0: No detection 1: Sole primary detection 2: Sole secondary detection 3: Combined primary and secondary detection ANT "" element 1 table 0: Target report from antenna 1 1: Target report from antenna 2 SPI "" element 1 table 0: Default 1: Special Position Identification RAB "" element 1 table 0: Default 1: Plot or track from a fixed transponder - TST "" element 1 table 0: Default 1: Test target indicator DS1DS2 "Radar Detection in Last Antenna Scan" element 2 table 0: Default 1: Unlawful interference (code 7500) 2: Radio-communication failure (code 7600) 3: Emergency (code 7700) ME "" element 1 table 0: Default 1: Military emergency MI "" element 1 table 0: Default 1: Military identification spare 2 - remark Note: - Bit-7 (SIM) is used to identify a simulated target report as produced by a traffic simulator. 030 "Warning/Error Conditions" definition Warning/error conditions detected by a radar station for the target report involved. repetitive fx element 7 table 0: No warning nor error condition 1: Garbled reply 2: Reflection 3: Sidelobe reply 4: Split plot 5: Second time around reply 6: Angels 7: Terrestrial vehicles 64: Possible wrong code in Mode-3/A 65: Possible wrong altitude information, transmitted when the Code C credibility check fails together with the Mode-C code in binary notation 66: Possible phantom MSSR plot 80: Fixed PSR plot 81: Slow PSR plot 82: Low quality PSR plot remark Notes: 1. Warning/error condition values 0-63 are reserved for common standard use, whereas the values 64-127 are application dependent. 040 "Measured Position in Polar Co-ordinates" definition Measured position of an aircraft in local polar co-ordinates. group RHO "" element 16 unsigned quantity 1/2^7 "NM" <= 512 THETA "" element 16 unsigned quantity 360/2^16 "°" remark Note: - When expressed in 16 bits, signed or unsigned azimuths have the same value. 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 1/2^6 "NM" >= -512 <= 512 Y "Y-Component" element 16 signed quantity 1/2^6 "NM" >= -512 <= 512 remark Notes: 1. LSB is calculated as :math:`2^{-6+f}`. 2. A default quantisation unit of 1/64 NM is obtained for a value of f = 0. 3. Negative values are expressed in 2's complement form, bit-32 and bit-16 shall be set to 0 for positive values and 1 for negative values. 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: 1. Smoothed Mode-2 data (bit-14 set to one) is used when the plot contains no Mode-2 code or the Mode-2 codes of the plot and track are different. 2. Bits-16/15 have no meaning in the case of a smoothed Mode-2 and are set to 0 for a calculated track. 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 remark Note: - This Data Item is only transmitted if at least one pulse is of low quality. 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: Smoothed Mode-3/A code as provided by a local tracker spare 1 MODE3A "Mode-3/A Reply in Octal Representation" element 12 string octal remark Notes: 1. The detector signals a garbled code (bit-15 set to one) when at least two replies are overlapping. 2. Smoothed Mode-3/A data (bit-14 set to a one) are used in the case of the absence of Mode-3/A code information in the plot, or in the case of a difference between the plot and track Mode-3/A code information. 3. Bits-16/15 have no meaning in the case of a smoothed Mode-3/A and are set to 0 for a calculated track. 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 "Mode-C Code in Binary Representation" definition Mode-C height 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 HGT "Mode-C HEIGHT" element 14 signed quantity 1/2^2 "FL" remark Notes: 1. The detector signals a garbled code when at least two replies are overlapping. 2. The maximum height which can be represented is 204 775 ft. Practically the maximum valid value is 126 750 ft (refer to ICAO Annex 10). 3. Negative values are expressed in 2's complement form, bit-14 is set to 0 for positive values and 1 for negative values. 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 monopulse SSR 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. This Data Item is only transmitted if at least one pulse is of low quality. 2. The detector signals a garbled code when at least two replies are overlapping. 120 "Measured Radial Doppler Speed" definition Radial component of the ground speed as measured by means of Doppler filter banks in radar signal processors. element 8 signed quantity 1/2^8 "NM/s" remark Notes: 1. LSB is calculated as :math:`2^{-14+f}`. 2. A default quantisation unit of 14.0625 kt and a maximum of +/- 1 800 kt is obtained for a value of f = 6. 3. Negative values are expressed in 2's complement form, bit-8 is set to 0 for positive values and 1 for negative values. 130 "Radar Plot Characteristics" definition Additional information on the quality of the target report. repetitive fx element 7 raw remark Notes: - The actual meaning of the bits is application dependent." - This Data Item may contain parameters such as plot runlength (primary and secondary), difference between primary and secondary derived azimuth, pulse amplitude, etc. 131 "Received Power" definition Measurement of the received power. element 8 signed quantity 1 "dBm" remark Notes: 1. POWER is the measured value of the power received on the sum pattern for a plot. 2. Negative values are expressed in 2's complement form, bit-8 is set to 0 for positive values and 1 for negative values. 141 "Truncated Time of Day" definition Absolute time stamping expressed as Coordinated Universal Time (UTC) time. element 16 unsigned quantity 1/2^7 "s" remark Notes: 1. The exchange of this Data Item allows the easy derivation of the correct UTC time value, provided that the clocks at the data source and sink(s) are less than 512 seconds out of synchronisation. Special care has to be taken at the transition of an "all ones" value to an "all zeros" value (every 512 seconds). 2. The time of day value is reset to 0 each day at midnight. 3. For time management in radar transmission applications, refer to Part 1, paragraph 5.4 [Ref. 2]. 150 "Presence of X-Pulse" definition Presence of the X-Pulse for the various modes applied in the interrogation interlace pattern. group XA "" element 1 table 0: Default 1: X-pulse received in Mode-3/A reply spare 1 XC "" element 1 table 0: Default 1: X-pulse received in Mode-C reply spare 2 X2 "" element 1 table 0: Default 1: X-pulse received in Mode-2 reply spare 2 remark Note: - This Data Item is transmitted only if at least one X-pulse has been received in a Mode-A, Mode-2 or Mode-C reply. 161 "Track Plot Number" definition An integer value representing a unique reference to a track/plot record within a particular track/plot file. element 16 raw remark Note: - The differentiation between track and plot number is either implicit or is made via the Target Report Descriptor (Data Item I001/020). 170 "Track Status" definition Status of track derived either from primary and/or secondary radar information. extended CON "" element 1 table 0: Confirmed Track 1: Track in initialisation phase RAD "" element 1 table 0: Primary track 1: SSR/Combined track MAN "" element 1 table 0: Default 1: Aircraft manoeuvring DOU "" element 1 table 0: Default 1: Doubtful plot to track association RDPC "Radar Data Processing Chain" element 1 table 0: RDP Chain 1 1: RDP Chain 2 spare 1 GHO "" element 1 table 0: Default 1: Ghost track - TRE "" element 1 table 0: Default 1: Last report for a track spare 6 - remark Notes: 1. Bit-2 (GHO) is used to signal that the track is suspected to have been generated by a fake target. 2. Bit-4 (RDPC) is used to signal the discontinuity of the track numbers. 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 "°" 210 "Track Quality" definition Relative track quality. repetitive fx element 7 raw remark Note: - Actual bit signification is application dependent. SP "Special Purpose Field" definition Special Purpose Field explicit sp RFS "Random Field Sequencing" definition Random Field Sequencing rfs uaps variations plot 010 020 040 070 090 130 141 050 120 131 080 100 060 030 150 - - - - SP RFS track 010 020 161 040 042 200 070 090 141 130 131 120 170 210 050 080 100 060 030 SP RFS 150 case 020/TYP 0: plot 1: track