asterix 205 "Radio Direction Finder Reports" edition 1.0 date 2020-03-17 preamble Surveillance data exchange. items 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. element 8 table 1: System Position Report 2: System Bearing Report 3: System Position Report of conflicting transmission 4: System Detection End Report 5: Sensor Data Report 010 "Data Source Identifier" definition Identification of the Radio Direction Finder System or Sensor from which the report 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). 015 "Service Identification" definition Identification of the service provided to one or more users. element 8 raw remark Note: The service identification is allocated by the system. 030 "Time of Day" definition UTC time of transmission of this ASTERIX message. element 24 unsigned quantity 1/2^7 "s" remark Note: The TOD value is reset to zero at every midnight UTC. 040 "Report Number" definition Sequential and cyclic number of position detection reports. element 8 raw remark Note: The number is incremented if there is a new position or bearing detected, independent from the respective channel. The report number shall also be incremented if, during the ongoing position or bearing detection, the position or bearing value is deviating by a system-defined threshold from the previous one. If the message type (I205/000) changes to another Detection Report, the report number is incremented as well. to detect lost messages. 050 "Position in WGS-84 Coordinates" definition Calculated position in WGS-84 Coordinates. group LAT "Latitude in WGS-84" element 32 signed quantity 180/2^25 "°" >= -90 <= 90 LON "Longitude in WGS-84" element 32 signed quantity 180/2^25 "°" >= -180 < 180 remark Note: The LSB provides a resolution at least better than 0.6 meters. For reports of Message Type 001 and 003, the item shall contain the estimated position of the transmitting aircraft. For reports of Message Type 002, the item shall contain the position of the bearing starting point, i.e. the position of the respective RDF sensor. 060 "Position in Cartesian Coordinates" definition Calculated position in Cartesian Coordinates. 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 remark Note: The Cartesian coordinates are relative to an agreed System Reference Point. The System Reference Point may be communicated in ASTERIX category 025, item 600. For reports of Message Type 001 and 003, the item shall contain the estimated position of the transmitting aircraft. For reports of Message Type 002, the item shall contain the position of the bearing starting point, i.e. the position of the respective RDF sensor. 070 "Local Bearing" definition Bearing of the detected radio transmission, starting at the position contained in I205/050 and given relative to this position. element 16 unsigned quantity 1/100 "°" >= 0 <= 360 remark Note: The angle is given in degrees, in clock-wise notation, starting with 0 degrees for the geographical North. 080 "System Bearing" definition Bearing of the detected radio transmission, starting at the position contained in I205/060, projected to the Cartesian Coordinate System relative to the System Reference Point (as used for I205/ 060). element 16 unsigned quantity 1/100 "°" >= 0 <= 360 remark Note: The angle is given in degrees, in clock-wise notation, starting with 0 degrees for the geographical North. 090 "Radio Channel Name" definition Name of the channel the radio transmission is detected on. element 56 string ascii remark Note: NU1 till NU7 contain digits or a decimal point in ASCII representation, specifying the name of the radio channel. Channel names that could be provided with less than 6 digits shall be filled with trailing zeroes (e.g. 121.100). This channel name is not identical with the actual physical frequency. 100 "Quality of Measurement" definition Quality of the measurement provided by the Radio Direction Finder system. element 8 raw remark Note: The actual meanings of the bits are application dependent. 110 "Estimated Uncertainty" definition Uncertainty estimation of the RDF System. The transmitter is expected to be within the provided radius around the calculated position. element 8 unsigned quantity 100 "m" >= 0 <= 25500 120 "Contributing Sensors" definition The identification of the RDF sensors that contributed to the detection of the radio transmitter. repetitive 8 element 8 raw remark Note: The actual identification of the receivers is application dependent. 130 "Conflicting Transmitter Position in WGS-84 Coordinates" definition Calculated position in WGS-84 Coordinates. This is the position of a second transmitter on the same frequency and overlapping in time with the transmitter position communicated in data item I205/050. group LAT "Latitude in WGS-84" element 32 signed quantity 180/2^25 "°" >= -90 <= 90 LON "Longitude in WGS-84" element 32 signed quantity 180/2^25 "°" >= -180 < 180 remark Note: The LSB provides a resolution at least better than 0.6 meters. 140 "Conflicting Transmitter Position in Cartesian Coordinates" definition Calculated position in Cartesian Coordinates. This is the position of a second transmitter on the same frequency and overlapping in time with the transmitter position communicated in data item I205/060. 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 remark Note: The Cartesian coordinates are relative to an agreed System Reference Point. The System Reference Point may be communicated in ASTERIX category 025, item 600. 150 "Conflicting Transmitter Estimated Uncertainty" definition Range uncertainty estimation of the RDF System for the Conflicting Transmitter, i.e. a transmitter on the same frequency and with a timely overlapping transmission. The transmitter is estimated to be within the provided radius around the detected position. element 8 unsigned quantity 100 "m" >= 0 <= 25500 160 "Track Number" definition Unique identification of a track at the calculated RDF position. element 16 raw 170 "Sensor Identification" definition Unique identification of an RDF sensor. element 8 raw remark Note: For Message Type 5 (Sensor Data Report) in I205/000, the item has to be used if there is no unique SAC/SIC defined for each RDF Sensor. The actual identification number is application dependent 180 "Signal Level" definition The level of the signal received by an RDF sensor. element 16 signed quantity 1/100 "dBµV" 190 "Signal Quality" definition Relative quality of the received signal as estimated by the RDF sensor. element 8 raw remark Note: 255 corresponds to the best quality, 0 to the worst quality 200 "Signal Elevation" definition The elevation of the signal received by an RDF sensor. element 16 signed quantity 1/100 "°" >= -90 <= 90 SP "Special Purpose Field" definition Special Purpose Field explicit sp uap 010 015 000 030 040 090 050 060 070 080 100 110 120 130 140 150 160 170 180 190 200 SP