ref 048 "Monoradar Target Reports Appendix A: Reserved Expansion Field" edition 1.11 date 2022-12-07 compound 8 MD5 "Mode 5 Reports" definition Mode 5 Data/Reports, Extended Mode 1 Code and X pulse. compound SUM "Mode 5 Summary" group M5 "" element 1 table 0: No Mode 5 interrogation 1: Mode 5 interrogation ID "" element 1 table 0: No authenticated Mode 5 ID reply/report 1: Authenticated Mode 5 ID reply/report DA "" element 1 table 0: No authenticated Mode 5 Data reply/report 1: Authenticated Mode 5 Data reply/report (i.e any valid Mode 5 reply type other than ID) M1 "" element 1 table 0: Mode 1 code not present or not from Mode 5 reply/report 1: Mode 1 code from Mode 5 reply/report M2 "" element 1 table 0: Mode 2 code not present or not from Mode 5 reply/report 1: Mode 2 code from Mode 5 reply/report M3 "" element 1 table 0: Mode 3 code not present or not from Mode 5 reply/report 1: Mode 3 code from Mode 5 reply/report MC "" element 1 table 0: Mode C altitude not present or not from Mode 5 reply/report 1: Mode C altitude from Mode 5 reply/report spare 1 remark Notes: 1. The flags M2, M3, MC refer to the contents of data items I048/050, I048/070 and I048/090 respectively. The flag M1 refers to the contents of data item I048/055, Mode 1 Code in Octal Representation, and to the contents of the Subitem #5 (Extended Mode 1 Code in Octal Representation). 2. If an authenticated Mode 5 reply/report is received with the Emergency bit set, then the Military Emergency bit (ME) in Data Item I048/020, Target Report Descriptor, shall be set. 3. If an authenticated Mode 5 reply/report is received with the Identification of Position bit set, then the Special Position Identification bit (SPI) in Data Item I048/020, Target Report Descriptor, shall be set. PMN "PIN/ National Origin/Mission Code" group spare 2 PIN "PIN Code" element 14 raw spare 2 NAV "Validity of NAT" element 1 table 0: National Origin is valid 1: National Origin is invalid NAT "National Origin" element 5 raw spare 2 MIS "Mission Code" element 6 raw remark Note: Bit 14 (NAV) is set to 1 if the value for National Origin is not known or invalid. Under certain conditions PIN is available but NAT is not available. NAV then indicates that the NAT field was not actively populated. POS "Mode 5 Reported Position" group LAT "Latitude in WGS 84" element 24 signed quantity 180/2^23 "°" >= -90/1 <= 90/1 LON "Longitude in WGS 84" element 24 signed quantity 180/2^23 "°" >= -180/1 <= 180/1 remark Notes: Latitude in WGS 84 is expressed as a 24-bit two’s complement number. Range -90° ≤ latitude ≤ 90°. Sign convention: North is positive. LSB = 180/223 degrees = 2.145767*10-05 degrees. Longitude in WGS 84 is expressed as a 24-bit two’s complement number. Range -180° ≤ longitude < 180°. Sign convention: East is positive. LSB = 180/223 degrees = 2.145767*10-05 degrees. The resolution implied by the LSB is better than the resolution with which Mode 5 position reports are transmitted from aircraft transponders using currently defined formats. GA "Mode 5 GNSS-derived Altitude" group spare 1 RES "" description "Resolution with which the GNSS-derived Altitude (GA) is reported" element 1 table 0: GA reported in 100 ft increments 1: GA reported in 25 ft increments GA "" description "GNSS-derived Altitude of target, expressed as height above WGS 84 ellipsoid" element 14 signed quantity 25 "ft" >= -1000 EM1 "Extended Mode 1 Code in Octal Representation" group V "" element 1 table 0: Code not validated 1: Code validated G "" element 1 table 0: Default 1: Garbled code L "" element 1 table 0: Mode 1 Code derived from the reply of the transponder 1: Mode 1 Code not extracted during the last scan spare 1 EM1 "Extended Mode 1 Code in Octal Representation" element 12 string octal remark Notes: 1. If Subitem #1 is present, the M1 bit in Subitem #1 indicates whether the Extended Mode 1 Code is from a Mode 5 reply or a Mode 1 reply. If Subitem #1 is not present, the Extended Mode 1 Code is from a Mode 1 reply. 2. For reasons of backwards compatibility the logic for the setting of the V-bit was inverted compared to other similar data items. 3. 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 data item I048/055. TOS "Time Offset for POS and GA" element 8 unsigned quantity 1/2^7 "s" remark Note: TOS shall be assumed to be zero if Subitem #6 is not present. XP "X Pulse Presence" group spare 2 XP "X-pulse from Mode 5 PIN Reply/Report" element 1 table 0: X-Pulse not present 1: X-pulse present X5 "X-pulse from Mode 5 Data Reply or Report" element 1 table 0: X-pulse set to zero or no authenticated Data reply or Report received 1: X-pulse set to one (present) XC "X-pulse from Mode C Reply" element 1 table 0: X-pulse set to zero or no Mode C reply 1: X-pulse set to one (present) X3 "X-pulse from Mode 3/A Reply" element 1 table 0: X-pulse set to zero or no Mode 3/A reply 1: X-pulse set to one (present) X2 "X-pulse from Mode 2 Reply" element 1 table 0: X-pulse set to zero or no Mode 2 reply 1: X-pulse set to one (present) X1 "X-pulse from Mode 1 Reply" element 1 table 0: X-pulse set to zero or no Mode 1 reply 1: X-pulse set to one (present) remark Note: Within Mode 5 replies/reports, the X-Pulse can be set for the following cases: 1. In a combined Mode 1 and Mode 2 reply/report: in this case the X5 bit and the X2 bit shall be set; 2. In a combined Mode 3 and Mode C reply/report: in this case the X5 bit and the X3 bit shall be set; 3. In a Mode 5 PIN data reply/report: in this case the X5 bit and the XP bit shall be set. The X1 bit and the XC bit are meaningless as in Mode 1 and Mode C replies/reports the X Pulse is not defined. They are kept for compatibility reasons. remark Note: In 2011 NATO has modified the format of the National Origin information available in subitem 2 of the Mode 5 data item in this Reserved Expansion Field. The information for National Origin and Mission Code were combined into a 11-bit long field. In order to maintain backwards compatibility and to ease the use of the new layout, the original Mode 5 data item was copied and the layout of subitem #2 adapted. The new layout is reflected in the data item M5N and shall be used by equipment prepared for the new National Origin system. Equipment certified to the previous encoding shall continue to use the data item MD5 corresponding to the 5-bit National Origin / 6-bit Mission Code. M5N "Mode 5 Reports, New Format" definition Mode 5 Data/Reports, Extended Mode 1 Code and X pulse following the updated NATO format for the National Origin code compound SUM "Mode 5 Summary" group M5 "" element 1 table 0: No Mode 5 interrogation 1: Mode 5 interrogation ID "" element 1 table 0: No authenticated Mode 5 ID reply/report 1: Authenticated Mode 5 ID reply/report DA "" element 1 table 0: No authenticated Mode 5 Data reply/report 1: Authenticated Mode 5 Data reply/report (i.e any valid Mode 5 reply type other than ID) M1 "" element 1 table 0: Mode 1 code not present or not from Mode 5 reply/report 1: Mode 1 code from Mode 5 reply/report M2 "" element 1 table 0: Mode 2 code not present or not from Mode 5 reply/report 1: Mode 2 code from Mode 5 reply/report M3 "" element 1 table 0: Mode 3 code not present or not from Mode 5 reply/report 1: Mode 3 code from Mode 5 reply/report MC "" element 1 table 0: Mode C altitude not present or not from Mode 5 reply/report 1: Mode C altitude from Mode 5 reply/report spare 1 remark Notes: 4. The flags M2, M3, MC refer to the contents of data items I048/050, I048/070 and I048/090 respectively. The flag M1 refers to the contents of data item I048/055, Mode 1 Code in Octal Representation, and to the contents of the Subitem #5 (Extended Mode 1 Code in Octal Representation). 5. If an authenticated Mode 5 reply/report is received with the Emergency bit set, then the Military Emergency bit (ME) in Data Item I048/020, Target Report Descriptor, shall be set. 6. If an authenticated Mode 5 reply/report is received with the Identification of Position bit set, then the Special Position Identification bit (SPI) in Data Item I048/020, Target Report Descriptor, shall be set. PMN "PIN/ National Origin/Mission Code" group spare 2 PIN "PIN Code" element 14 raw spare 4 NOV "Validity of NO" element 1 table 0: National Origin is valid 1: National Origin is invalid NO "National Origin" element 11 raw remark Note: Bit 12 (NOV) is set to 1 if the value for National Origin is not known or invalid. Under certain conditions PIN is available but NO is not available. NOV then indicates that the NO field was not actively populated. POS "Mode 5 Reported Position" group LAT "Latitude in WGS 84" element 24 signed quantity 180/2^23 "°" >= -90/1 <= 90/1 LON "Longitude in WGS 84" element 24 signed quantity 180/2^23 "°" >= -180/1 <= 180/1 remark Notes: Latitude in WGS 84 is expressed as a 24-bit two’s complement number. Range -90° ≤ latitude ≤ 90°. Sign convention: North is positive. LSB = 180/223 degrees = 2.145767*10-05 degrees Longitude in WGS 84 is expressed as a 24-bit two’s complement number. Range -180° ≤ longitude < 180°. Sign convention: East is positive. LSB = 180/223 degrees = 2.145767*10-05 degrees The resolution implied by the LSB is better than the resolution with which Mode 5 position reports are transmitted from aircraft transponders using currently defined formats. GA "Mode 5 GNSS-derived Altitude" group spare 1 RES "" description Resolution with which the GNSS-derived Altitude (GA) is reported element 1 table 0: GA reported in 100 ft increments 1: GA reported in 25 ft increments GA "" description GNSS-derived Altitude of target, expressed as height above WGS 84 ellipsoid element 14 signed quantity 25 "ft" >= -1000 EM1 "Extended Mode 1 Code in Octal Representation" group V "" element 1 table 0: Code not validated 1: Code validated G "" element 1 table 0: Default 1: Garbled code L "" element 1 table 0: Mode 1 Code derived from the reply of the transponder 1: Mode 1 Code not extracted during the last scan spare 1 EM1 "Extended Mode 1 Code in Octal Representation" element 12 string octal remark Notes: 1. If Subitem #1 is present, the M1 bit in Subitem #1 indicates whether the Extended Mode 1 Code is from a Mode 5 reply or a Mode 1 reply. If Subitem #1 is not present, the Extended Mode 1 Code is from a Mode 1 reply. 2. For reasons of backwards compatibility the logic for the setting of the V-bit was inverted compared to other similar data items. 3. 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 data item I048/055. TOS "Time Offset for POS and GA" element 8 unsigned quantity 1/2^7 "s" remark Note: TOS shall be assumed to be zero if Subitem #6 is not present. XP "X Pulse Presence" group spare 2 XP "X-pulse from Mode 5 PIN Reply/Report" element 1 table 0: X-Pulse not present 1: X-pulse present X5 "X-pulse from Mode 5 Data Reply or Report" element 1 table 0: X-pulse set to zero or no authenticated Data reply or Report received 1: X-pulse set to one (present) XC "X-pulse from Mode C Reply" element 1 table 0: X-pulse set to zero or no Mode C reply 1: X-pulse set to one (present) X3 "X-pulse from Mode 3/A Reply" element 1 table 0: X-pulse set to zero or no Mode 3/A reply 1: X-pulse set to one (present) X2 "X-pulse from Mode 2 Reply" element 1 table 0: X-pulse set to zero or no Mode 2 reply 1: X-pulse set to one (present) X1 "X-pulse from Mode 1 Reply" element 1 table 0: X-pulse set to zero or no Mode 1 reply 1: X-pulse set to one (present) remark Note: Within Mode 5 replies/reports, the X-Pulse can be set for the following cases: 1. In a combined Mode 1 and Mode 2 reply/report: in this case the X5 bit and the X2 bit shall be set; 2. In a combined Mode 3 and Mode C reply/report: in this case the X5 bit and the X3 bit shall be set; 3. In a Mode 5 PIN data reply/report: in this case the X5 bit and the XP bit shall be set. The X1 bit and the XC bit are meaningless as in Mode 1 and Mode C replies/reports the X Pulse is not defined. They are kept for compatibility reasons. FOM "Figure of Merit" group spare 3 FOM "" description Figure of Merit. Position Accuracy as extracted and provided by a Mode 5 transponder. element 5 raw remark Note: In 2011 NATO has modified the format of the National Origin information available in subitem 2 of the Mode 5 data item in this Reserved Expansion Field. The information for National Origin and Mission Code were combined into a 11-bit long field. In order to maintain backwards compatibility and to ease the use of the new layout, the original Mode 5 data item was copied and the layout of subitem #2 adapted. The new layout is reflected in the data item M5N and shall be used by equipment prepared for the new National Origin system. Equipment certified to the previous encoding shall continue to use the data item MD5 corresponding to the 5-bit National Origin / 6-bit Mission Code. M4E "Extended Mode 4 Report" definition Extended encoding of the Mode 4 interrogation result extended spare 5 FOEFRI "Indication Foe/Friend (Mode4)" element 2 table 0: No Mode 4 interrogation 1: Possibly friendly target 2: Probably friendly target 3: Friendly target - RPC "Radar Plot Characteristics" definition Extension to data item I048/130 for primary reports compound SCO "Score" description The score describes the number of raw responses used to create the plot. element 8 unsigned integer SRC "Signal/Clutter Ratio" description The Signal / Clutter Ratio describes the difference in signal strength between the signal constituting the raw plot and the signal of the clutter. element 16 unsigned quantity 1/10 "dB" >= 1/10 <= 2550 RW "Range Width" description The Range Width defines the difference in range between the closest proximity to the radar of the raw response and the point farthest away from the radar. element 16 unsigned quantity 1/2^8 "NM" <= 256/1 AR "Ambiguous Range" description The Ambiguous Range describes the Pulse Repetition Interval of the radar in range. element 16 unsigned quantity 1/2^8 "NM" <= 256/1 ERR "Extended Range Report" definition Adaptation of data item I048/040 to extended range radars for provision of the measured range of an aircraft in local polar coordinates when the range is equal to or greater than 256NM element 24 unsigned quantity 1/2^8 "NM" <= 65535 remark Notes: 1. For radars with an operational range beyond 256 NM data item I048/040 is insufficient. These radars may use this extension to provide the target position equal to or beyond 256 NM. In such cases, data item I048/040 shall be transmitted in addition to this extension. In this case it is recommended to set bits 32/17 in data item I048/040 to “1”. 2. The Encoding Rule for data item I048/040 still applies. 3. 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. 4. In case of combined detection by a PSR and an SSR, then the SSR position is sent. 5. Before migrating an ASTERIX encoder to Edition 1.10 of this specification, care has to be taken that receiving decoders allow the presence of the value 256 NM in the record. Systems applying a range check may otherwise suppress the record. RTC "Radar Track Characteristics" definition Additional Track Characteristics compound PTL "Plot/Track Link" description Providing link between a track and its associated plot. group spare 3 SCN "Track / SCN Association" element 1 table 0: Track is not associated with an SCN Plot 1: Track is associated with an SCN Plot RC "Roll Call Component" element 1 table 0: Associated Plot does not contain a Roll Call component 1: Associated Plot contains at least a Roll Call component AC "All Call Component" element 1 table 0: Associated Plot does not contain an All Call component 1: Associated Plot contains at least an All Call component SSR "SSR Component" element 1 table 0: Associated Plot does not contain an SSR component 1: Associated Plot contains at least an SSR component PSR "PSR Component" element 1 table 0: Associated Plot does not contain a PSR component 1: Associated Plot contains at least a PSR component PLOTNR "" description Unique reference to the associated plot record element 16 raw remark Notes: 1. (to bits-16/1): If SCN = 0, PLOTNR shall be set to 0. 2. (to bit-21): If SCN = 1, I048/020/SCN#VAL – if implemented - shall be set to “1”. ATL "ADS-B/Track Link" description Providing link between a track and its associated ADS-B Report. repetitive 8 element 16 raw remark Note: The presence of this information shall be communicated in Data Item I048/020 by setting I048/020/ADSB#VAL – if implemented - = 1. TRN "Turn State" description Turn State with probability with regards to track evolution hypothesis (Circular model). element 8 unsigned quantity 1 "%" <= 100 NPP "Next Predicted Position" description Next predicted position for a track update at the next expected antenna rotation in reference to the current track update. group PREDRHO "Predicted Range" element 16 unsigned quantity 1/2^7 "NM" PREDTHETA "Predicted Azimuth" element 16 unsigned quantity 360/2^16 "°" EVOLRHOSTART "Predicted Closest Range" element 16 unsigned quantity 1/2^7 "NM" EVOLRHOEND "Predicted Largest Range" element 16 unsigned quantity 1/2^7 "NM" EVOLTHETASTART "Predicted Smallest Azimuth" element 16 unsigned quantity 360/2^16 "°" EVOLTHETAEND "Predicted Largest Azimuth" element 16 unsigned quantity 360/2^16 "°" NOISERHOSTART "Predicted Closest Range" element 16 unsigned quantity 1/2^7 "NM" NOISERHOEND "Predicted Largest Range" element 16 unsigned quantity 1/2^7 "NM" NOISETHETASTART "Predicted Smallest Azimuth" element 16 unsigned quantity 360/2^16 "°" NOISETHETAEND "Predicted Largest Azimuth" element 16 unsigned quantity 360/2^16 "°" PREDTIME "Predicted Detection Time" element 16 unsigned quantity 1/2^7 "s" remark Notes: 1. When the area crosses North, THETASTART is larger than THETAEND. 2. Next detection = Time of Day of current track record + PREDTIME. DLK "Data Link Characteristics" description Active message list for the aircraft for the current scan. repetitive 8 group TYPE "" description Type of Message Protocol element 4 table 0: Surveillance Mode A (alert bit or periodic) 1: Comm-A 2: Ground Initiated Comm-B 3: Air Initiated Comm-B 4: Broadcast Comm-B 5: Comm-C 6: Comm-D 7: Reserved for future use 8: Reserved for future use 9: Reserved for future use 10: Reserved for future use 11: Reserved for future use 12: Reserved for future use 13: Reserved for future use 14: Reserved for future use 15: Reserved for future use ORIGIN "" description Frame Detection element 2 table 0: From previous scan 1: New in current scan 2: Requested in the beam by transponder 3: Invalid ASTERIX value STATE "" description Frame state at aircraft release element 2 table 0: In progress 1: Completed 2: Cancelled 3: Invalid ASTERIX value LCK "Lockout Characteristics" description Lockout State and remaining Lockout Time group LS "Lockout State" element 1 table 0: Target not locked out by this radar 1: Target locked out by this radar LOCTIM "Lockout Time" element 15 unsigned quantity 1 "ms" TC "Transition Code" description Indication and Counter of Transition Codes for Modes 1, 2, and 3 group spare 7 TCOUNT1 "" description Number of scans with transient Mode 1 Code element 4 unsigned integer TCODE1 "" description Transient Mode 1 Code element 5 raw TCOUNT2 "" description Number of scans with transient Mode 2 Code element 4 unsigned integer TCODE2 "" description Transient Mode 2 Code element 12 string octal TCOUNT3 "" description Number of scans with transient Mode 3 Code element 4 unsigned integer TCODE3 "" description Transient Mode 3 Code element 12 string octal remark Notes: 1. This item indicates a difference in the value for TCODEX between the code in the track file and the code from the latest plot updating the track. 2. If TCOUNTX is set to 0 then TCODEX is meaningless and all bits shall be set to 0. 3. The meaning of the individual bits in TCODEX is described in ICAO Annex 10 Volume 4 Chapter 3.1.1.6.2. TLC "Track Life Cycle" description Acquisition Status of the Track and Track Life Cycle Counters group ACQI "" description Acquisition Status Indicator element 2 table 0: Tentative Track with One Plot 1: Tentative Track with at least Two Plots 2: Pre-Confirmed Track 3: Confirmed Track TRKUPDCTR "" description Track Update Counter element 14 unsigned integer LASTTRKUPD "" description Time since last Track Update element 16 unsigned quantity 1 "ms" remark Notes: 1. When Subitem #8 is included, each element shall be properly populated. 2. The setting of bits 32/31 is implementation dependent and shall be described in the ICD of the system generating the ASTERIX record. 3. The TRKUPDCTR is initiated with a value of 1 and it is incremented by 1 each time a track is updated. 4. The LASTTRKUPD is set to 0 each time a track is updated. ASI "Adjacent Sensor Information" description Adjacent Sensor information (received via SCN) for the respective Mode S address repetitive 8 group SACADJS "SAC of the Adjacent Sensor" element 8 raw SICADJS "SIC of the Adjacent Sensor" element 8 raw TIMEOFDAYSCN "Absolute Timestamp in UTC Provided by the SCN" element 16 unsigned quantity 1/2^7 "s" DATAUSE "Use of Adjacent Sensor Data" element 7 table 0: Data used by Tracker 1: Data not used by Tracker 2: 2-127: Reserved for future use DRNA "DRN Availability" element 1 table 0: DRN not available 1: DRN available DRN "" description Duplicate Address Reference Number uniquely identifying the aircraft in case of a duplicate Mode S Address element 16 raw TES "Track Extrapolation Source" description Source for the extrapolation of the track information element 8 table 0: Radar tracker calculation 1: Integrated ADS-B 2: External ADS-B 3: SCN IR "Identity Requested" description Information whether during latest scan the Mode 3/A Code was requested group IR "" description Identity Requested during latest scan element 1 table 0: Identity not requested 1: Identity requested M3A "Age of Mode 3/A Code (I048/070)" element 7 unsigned quantity 1 "s" CPC "Common and Plot Characteristics" definition Plot Characteristics and Common Characteristics for Plots and Tracks compound PNB "Plot Number" description Unique reference to a Plot Record element 16 raw RPL "Replies/Plot Link" description Link between a Plot and its Replies repetitive 8 group TYPE "Reply Type" element 8 table 0: PSR Echo 1: SSR Reply 2: All Call Reply 3: Roll Call Reply REPLYNBR "" description Unique reference to a plot record element 16 raw SNB "Scan Number" description Scan Number element 8 unsigned integer remark Note: The Scan Number ranges from 1 to 127 and is incremented when the radar passes North. Once SCANNBR reached 127 it will restarted at 1 with the next scan. DATE "Common and Plot Characteristics Date" description Current Date in the form YYYYMMDD group Y1 "" description First digit of year element 4 unsigned integer >= 0 <= 10 Y2 "" description Second digit of year element 4 unsigned integer >= 0 <= 10 Y3 "" description Third digit of year element 4 unsigned integer >= 0 <= 10 Y4 "" description Fourth digit of year element 4 unsigned integer >= 0 <= 10 M1 "" description First digit of month element 4 unsigned integer >= 0 <= 1 M2 "" description Second digit of month element 4 unsigned integer >= 0 <= 10 D1 "" description First digit of day element 4 unsigned integer >= 0 <= 3 D2 "" description Second digit of day element 4 unsigned integer >= 0 <= 10 remark Note: The day is incremented at midnight UTC.