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asterix_cat001_1_3.xml
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asterix_cat001_1_3.xml
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE Category SYSTEM "asterix.dtd">
<!--
Asterix Category 001 v1.3 definition
Do not edit this file!
This file is auto-generated from json specs file.
sha1sum of concatenated json input(s): 817a9cc056850f867a774fa1d794e09133877d55
See asterix-specs-converter/README.md for details.
-->
<Category id="1" name="Transmission of Monoradar Data Target Reports" ver="1.3">
<DataItem id="010">
<DataItemName>Data Source Identifier</DataItemName>
<DataItemDefinition>
Identification of the radar station from which the data are received.
</DataItemDefinition>
<DataItemFormat desc="2-octet fixed length data item.">
<Fixed length="2">
<Bits from="16" to="9">
<BitsShortName>SAC</BitsShortName>
<BitsName>System Area Code</BitsName>
</Bits>
<Bits from="8" to="1">
<BitsShortName>SIC</BitsShortName>
<BitsName>System Identification Code</BitsName>
</Bits>
</Fixed>
</DataItemFormat>
<DataItemNote>
Note:
The defined SACs are on the EUROCONTROL ASTERIX website
(www.eurocontrol.int/asterix)
</DataItemNote>
</DataItem>
<DataItem id="020">
<DataItemName>Target Report Descriptor</DataItemName>
<DataItemDefinition>
Type and characteristics of the radar data as transmitted by a radar station.
</DataItemDefinition>
<DataItemFormat desc="Variable data item.">
<Variable>
<Fixed length="1">
<Bits bit="8">
<BitsShortName>TYP</BitsShortName>
<BitsValue val="0">Plot</BitsValue>
<BitsValue val="1">Track</BitsValue>
</Bits>
<Bits bit="7">
<BitsShortName>SIM</BitsShortName>
<BitsValue val="0">Actual plot or track</BitsValue>
<BitsValue val="1">Simulated plot or track</BitsValue>
</Bits>
<Bits from="6" to="5">
<BitsShortName>SSRPSR</BitsShortName>
<BitsName>Radar Detection in Last Antenna Scan</BitsName>
<BitsValue val="0">No detection</BitsValue>
<BitsValue val="1">Sole primary detection</BitsValue>
<BitsValue val="2">Sole secondary detection</BitsValue>
<BitsValue val="3">Combined primary and secondary detection</BitsValue>
</Bits>
<Bits bit="4">
<BitsShortName>ANT</BitsShortName>
<BitsValue val="0">Target report from antenna 1</BitsValue>
<BitsValue val="1">Target report from antenna 2</BitsValue>
</Bits>
<Bits bit="3">
<BitsShortName>SPI</BitsShortName>
<BitsValue val="0">Default</BitsValue>
<BitsValue val="1">Special Position Identification</BitsValue>
</Bits>
<Bits bit="2">
<BitsShortName>RAB</BitsShortName>
<BitsValue val="0">Default</BitsValue>
<BitsValue val="1">Plot or track from a fixed transponder</BitsValue>
</Bits>
<Bits bit="1" fx="1">
<BitsShortName>FX</BitsShortName>
<BitsName>Extension Indicator</BitsName>
<BitsValue val="0">End of Data Item</BitsValue>
<BitsValue val="1">Extension</BitsValue>
</Bits>
</Fixed>
<Fixed length="1">
<Bits bit="8">
<BitsShortName>TST</BitsShortName>
<BitsValue val="0">Default</BitsValue>
<BitsValue val="1">Test target indicator</BitsValue>
</Bits>
<Bits from="7" to="6">
<BitsShortName>DS1DS2</BitsShortName>
<BitsName>Radar Detection in Last Antenna Scan</BitsName>
<BitsValue val="0">Default</BitsValue>
<BitsValue val="1">Unlawful interference (code 7500)</BitsValue>
<BitsValue val="2">Radio-communication failure (code 7600)</BitsValue>
<BitsValue val="3">Emergency (code 7700)</BitsValue>
</Bits>
<Bits bit="5">
<BitsShortName>ME</BitsShortName>
<BitsValue val="0">Default</BitsValue>
<BitsValue val="1">Military emergency</BitsValue>
</Bits>
<Bits bit="4">
<BitsShortName>MI</BitsShortName>
<BitsValue val="0">Default</BitsValue>
<BitsValue val="1">Military identification</BitsValue>
</Bits>
<Bits from="3" to="2">
<BitsShortName>spare</BitsShortName>
<BitsName>Spare bit(s) set to 0</BitsName>
<BitsConst>0</BitsConst>
</Bits>
<Bits bit="1" fx="1">
<BitsShortName>FX</BitsShortName>
<BitsName>Extension Indicator</BitsName>
<BitsValue val="0">End of Data Item</BitsValue>
<BitsValue val="1">Extension</BitsValue>
</Bits>
</Fixed>
</Variable>
</DataItemFormat>
<DataItemNote>
Note:
- Bit-7 (SIM) is used to identify a simulated target report as produced by a traffic simulator.
</DataItemNote>
</DataItem>
<DataItem id="030">
<DataItemName>Warning/Error Conditions</DataItemName>
<DataItemDefinition>
Warning/error conditions detected by a radar station for the target
report involved.
</DataItemDefinition>
<DataItemFormat desc="Variable data item.">
<Variable>
<Fixed length="1">
<Bits from="8" to="2">
<BitsShortName>WE</BitsShortName>
<BitsName>WEVALUE</BitsName>
<BitsValue val="0">No warning nor error condition</BitsValue>
<BitsValue val="1">Garbled reply</BitsValue>
<BitsValue val="2">Reflection</BitsValue>
<BitsValue val="3">Sidelobe reply</BitsValue>
<BitsValue val="4">Split plot</BitsValue>
<BitsValue val="5">Second time around reply</BitsValue>
<BitsValue val="6">Angels</BitsValue>
<BitsValue val="7">Terrestrial vehicles</BitsValue>
<BitsValue val="64">Possible wrong code in Mode-3/A</BitsValue>
<BitsValue val="65">Possible wrong altitude information, transmitted when the Code C credibility check fails together with the Mode-C code in binary notation</BitsValue>
<BitsValue val="66">Possible phantom MSSR plot</BitsValue>
<BitsValue val="80">Fixed PSR plot</BitsValue>
<BitsValue val="81">Slow PSR plot</BitsValue>
<BitsValue val="82">Low quality PSR plot</BitsValue>
</Bits>
<Bits bit="1" fx="1">
<BitsShortName>FX</BitsShortName>
<BitsName>Extension Indicator</BitsName>
<BitsValue val="0">End of Data Item</BitsValue>
<BitsValue val="1">Extension</BitsValue>
</Bits>
</Fixed>
</Variable>
</DataItemFormat>
<DataItemNote>
Notes:
1. Warning/error condition values 0-63 are reserved for common
standard use, whereas the values 64-127 are application dependent.
</DataItemNote>
</DataItem>
<DataItem id="040">
<DataItemName>Measured Position in Polar Co-ordinates</DataItemName>
<DataItemDefinition>
Measured position of an aircraft in local polar co-ordinates.
</DataItemDefinition>
<DataItemFormat desc="4-octet fixed length data item.">
<Fixed length="4">
<Bits from="32" to="17" encode="unsigned">
<BitsShortName>RHO</BitsShortName>
<BitsUnit scale="0.0078125" max="512">NM</BitsUnit>
</Bits>
<Bits from="16" to="1" encode="unsigned">
<BitsShortName>THETA</BitsShortName>
<BitsUnit scale="0.0054931640625">deg</BitsUnit>
</Bits>
</Fixed>
</DataItemFormat>
<DataItemNote>
Note:
- When expressed in 16 bits, signed or unsigned azimuths have the same value.
</DataItemNote>
</DataItem>
<DataItem id="042">
<DataItemName>Calculated Position in Cartesian Co-ordinates</DataItemName>
<DataItemDefinition>
Calculated position of an aircraft in Cartesian co-ordinates.
</DataItemDefinition>
<DataItemFormat desc="4-octet fixed length data item.">
<Fixed length="4">
<Bits from="32" to="17" encode="signed">
<BitsShortName>X</BitsShortName>
<BitsName>X-Component</BitsName>
<BitsUnit scale="0.015625" min="-512" max="512">NM</BitsUnit>
</Bits>
<Bits from="16" to="1" encode="signed">
<BitsShortName>Y</BitsShortName>
<BitsName>Y-Component</BitsName>
<BitsUnit scale="0.015625" min="-512" max="512">NM</BitsUnit>
</Bits>
</Fixed>
</DataItemFormat>
<DataItemNote>
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.
</DataItemNote>
</DataItem>
<DataItem id="050">
<DataItemName>Mode-2 Code in Octal Representation</DataItemName>
<DataItemDefinition>
Reply to Mode-2 interrogation.
</DataItemDefinition>
<DataItemFormat desc="2-octet fixed length data item.">
<Fixed length="2">
<Bits bit="16">
<BitsShortName>V</BitsShortName>
<BitsValue val="0">Code validated</BitsValue>
<BitsValue val="1">Code not validated</BitsValue>
</Bits>
<Bits bit="15">
<BitsShortName>G</BitsShortName>
<BitsValue val="0">Default</BitsValue>
<BitsValue val="1">Garbled code</BitsValue>
</Bits>
<Bits bit="14">
<BitsShortName>L</BitsShortName>
<BitsValue val="0">Mode-2 code as derived from the reply of the transponder</BitsValue>
<BitsValue val="1">Smoothed Mode-2 code as provided by a local tracker</BitsValue>
</Bits>
<Bits bit="13">
<BitsShortName>spare</BitsShortName>
<BitsName>Spare bit(s) set to 0</BitsName>
<BitsConst>0</BitsConst>
</Bits>
<Bits from="12" to="1" encode="octal">
<BitsShortName>MODE2</BitsShortName>
<BitsName>Mode-2 Code in Octal Representation</BitsName>
</Bits>
</Fixed>
</DataItemFormat>
<DataItemNote>
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.
</DataItemNote>
</DataItem>
<DataItem id="060">
<DataItemName>Mode-2 Code Confidence Indicator</DataItemName>
<DataItemDefinition>
Confidence level for each bit of a Mode-2 reply as provided by a monopulse SSR station.
</DataItemDefinition>
<DataItemFormat desc="2-octet fixed length data item.">
<Fixed length="2">
<Bits from="16" to="13">
<BitsShortName>spare</BitsShortName>
<BitsName>Spare bit(s) set to 0</BitsName>
<BitsConst>0</BitsConst>
</Bits>
<Bits bit="12">
<BitsShortName>QA4</BitsShortName>
<BitsValue val="0">High quality pulse A4</BitsValue>
<BitsValue val="1">Low quality pulse A4</BitsValue>
</Bits>
<Bits bit="11">
<BitsShortName>QA2</BitsShortName>
<BitsValue val="0">High quality pulse A2</BitsValue>
<BitsValue val="1">Low quality pulse A2</BitsValue>
</Bits>
<Bits bit="10">
<BitsShortName>QA1</BitsShortName>
<BitsValue val="0">High quality pulse A1</BitsValue>
<BitsValue val="1">Low quality pulse A1</BitsValue>
</Bits>
<Bits bit="9">
<BitsShortName>QB4</BitsShortName>
<BitsValue val="0">High quality pulse B4</BitsValue>
<BitsValue val="1">Low quality pulse B4</BitsValue>
</Bits>
<Bits bit="8">
<BitsShortName>QB2</BitsShortName>
<BitsValue val="0">High quality pulse B2</BitsValue>
<BitsValue val="1">Low quality pulse B2</BitsValue>
</Bits>
<Bits bit="7">
<BitsShortName>QB1</BitsShortName>
<BitsValue val="0">High quality pulse B1</BitsValue>
<BitsValue val="1">Low quality pulse B1</BitsValue>
</Bits>
<Bits bit="6">
<BitsShortName>QC4</BitsShortName>
<BitsValue val="0">High quality pulse C4</BitsValue>
<BitsValue val="1">Low quality pulse C4</BitsValue>
</Bits>
<Bits bit="5">
<BitsShortName>QC2</BitsShortName>
<BitsValue val="0">High quality pulse C2</BitsValue>
<BitsValue val="1">Low quality pulse C2</BitsValue>
</Bits>
<Bits bit="4">
<BitsShortName>QC1</BitsShortName>
<BitsValue val="0">High quality pulse C1</BitsValue>
<BitsValue val="1">Low quality pulse C1</BitsValue>
</Bits>
<Bits bit="3">
<BitsShortName>QD4</BitsShortName>
<BitsValue val="0">High quality pulse D4</BitsValue>
<BitsValue val="1">Low quality pulse D4</BitsValue>
</Bits>
<Bits bit="2">
<BitsShortName>QD2</BitsShortName>
<BitsValue val="0">High quality pulse D2</BitsValue>
<BitsValue val="1">Low quality pulse D2</BitsValue>
</Bits>
<Bits bit="1">
<BitsShortName>QD1</BitsShortName>
<BitsValue val="0">High quality pulse D1</BitsValue>
<BitsValue val="1">Low quality pulse D1</BitsValue>
</Bits>
</Fixed>
</DataItemFormat>
<DataItemNote>
Note:
- This Data Item is only transmitted if at least one pulse is of low quality.
</DataItemNote>
</DataItem>
<DataItem id="070">
<DataItemName>Mode-3/A Code in Octal Representation</DataItemName>
<DataItemDefinition>
Mode-3/A code converted into octal representation.
</DataItemDefinition>
<DataItemFormat desc="2-octet fixed length data item.">
<Fixed length="2">
<Bits bit="16">
<BitsShortName>V</BitsShortName>
<BitsValue val="0">Code validated</BitsValue>
<BitsValue val="1">Code not validated</BitsValue>
</Bits>
<Bits bit="15">
<BitsShortName>G</BitsShortName>
<BitsValue val="0">Default</BitsValue>
<BitsValue val="1">Garbled code</BitsValue>
</Bits>
<Bits bit="14">
<BitsShortName>L</BitsShortName>
<BitsValue val="0">Mode-3/A code derived from the reply of the transponder</BitsValue>
<BitsValue val="1">Smoothed Mode-3/A code as provided by a local tracker</BitsValue>
</Bits>
<Bits bit="13">
<BitsShortName>spare</BitsShortName>
<BitsName>Spare bit(s) set to 0</BitsName>
<BitsConst>0</BitsConst>
</Bits>
<Bits from="12" to="1" encode="octal">
<BitsShortName>MODE3A</BitsShortName>
<BitsName>Mode-3/A Reply in Octal Representation</BitsName>
</Bits>
</Fixed>
</DataItemFormat>
<DataItemNote>
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.
</DataItemNote>
</DataItem>
<DataItem id="080">
<DataItemName>Mode-3/A Code Confidence Indicator</DataItemName>
<DataItemDefinition>
Confidence level for each bit of a Mode-3/A reply as provided by a monopulse SSR station.
</DataItemDefinition>
<DataItemFormat desc="2-octet fixed length data item.">
<Fixed length="2">
<Bits from="16" to="13">
<BitsShortName>spare</BitsShortName>
<BitsName>Spare bit(s) set to 0</BitsName>
<BitsConst>0</BitsConst>
</Bits>
<Bits bit="12">
<BitsShortName>QA4</BitsShortName>
<BitsValue val="0">High quality pulse A4</BitsValue>
<BitsValue val="1">Low quality pulse A4</BitsValue>
</Bits>
<Bits bit="11">
<BitsShortName>QA2</BitsShortName>
<BitsValue val="0">High quality pulse A2</BitsValue>
<BitsValue val="1">Low quality pulse A2</BitsValue>
</Bits>
<Bits bit="10">
<BitsShortName>QA1</BitsShortName>
<BitsValue val="0">High quality pulse A1</BitsValue>
<BitsValue val="1">Low quality pulse A1</BitsValue>
</Bits>
<Bits bit="9">
<BitsShortName>QB4</BitsShortName>
<BitsValue val="0">High quality pulse B4</BitsValue>
<BitsValue val="1">Low quality pulse B4</BitsValue>
</Bits>
<Bits bit="8">
<BitsShortName>QB2</BitsShortName>
<BitsValue val="0">High quality pulse B2</BitsValue>
<BitsValue val="1">Low quality pulse B2</BitsValue>
</Bits>
<Bits bit="7">
<BitsShortName>QB1</BitsShortName>
<BitsValue val="0">High quality pulse B1</BitsValue>
<BitsValue val="1">Low quality pulse B1</BitsValue>
</Bits>
<Bits bit="6">
<BitsShortName>QC4</BitsShortName>
<BitsValue val="0">High quality pulse C4</BitsValue>
<BitsValue val="1">Low quality pulse C4</BitsValue>
</Bits>
<Bits bit="5">
<BitsShortName>QC2</BitsShortName>
<BitsValue val="0">High quality pulse C2</BitsValue>
<BitsValue val="1">Low quality pulse C2</BitsValue>
</Bits>
<Bits bit="4">
<BitsShortName>QC1</BitsShortName>
<BitsValue val="0">High quality pulse C1</BitsValue>
<BitsValue val="1">Low quality pulse C1</BitsValue>
</Bits>
<Bits bit="3">
<BitsShortName>QD4</BitsShortName>
<BitsValue val="0">High quality pulse D4</BitsValue>
<BitsValue val="1">Low quality pulse D4</BitsValue>
</Bits>
<Bits bit="2">
<BitsShortName>QD2</BitsShortName>
<BitsValue val="0">High quality pulse D2</BitsValue>
<BitsValue val="1">Low quality pulse D2</BitsValue>
</Bits>
<Bits bit="1">
<BitsShortName>QD1</BitsShortName>
<BitsValue val="0">High quality pulse D1</BitsValue>
<BitsValue val="1">Low quality pulse D1</BitsValue>
</Bits>
</Fixed>
</DataItemFormat>
</DataItem>
<DataItem id="090">
<DataItemName>Mode-C Code in Binary Representation</DataItemName>
<DataItemDefinition>
Mode-C height converted into binary representation.
</DataItemDefinition>
<DataItemFormat desc="2-octet fixed length data item.">
<Fixed length="2">
<Bits bit="16">
<BitsShortName>V</BitsShortName>
<BitsValue val="0">Code validated</BitsValue>
<BitsValue val="1">Code not validated</BitsValue>
</Bits>
<Bits bit="15">
<BitsShortName>G</BitsShortName>
<BitsValue val="0">Default</BitsValue>
<BitsValue val="1">Garbled code</BitsValue>
</Bits>
<Bits from="14" to="1" encode="signed">
<BitsShortName>HGT</BitsShortName>
<BitsName>Mode-C HEIGHT</BitsName>
<BitsUnit scale="0.25">FL</BitsUnit>
</Bits>
</Fixed>
</DataItemFormat>
<DataItemNote>
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.
</DataItemNote>
</DataItem>
<DataItem id="100">
<DataItemName>Mode-C Code and Code Confidence Indicator</DataItemName>
<DataItemDefinition>
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.
</DataItemDefinition>
<DataItemFormat desc="4-octet fixed length data item.">
<Fixed length="4">
<Bits bit="32">
<BitsShortName>V</BitsShortName>
<BitsValue val="0">Code validated</BitsValue>
<BitsValue val="1">Code not validated</BitsValue>
</Bits>
<Bits bit="31">
<BitsShortName>G</BitsShortName>
<BitsValue val="0">Default</BitsValue>
<BitsValue val="1">Garbled code</BitsValue>
</Bits>
<Bits from="30" to="29">
<BitsShortName>spare</BitsShortName>
<BitsName>Spare bit(s) set to 0</BitsName>
<BitsConst>0</BitsConst>
</Bits>
<Bits from="28" to="17">
<BitsShortName>MODEC</BitsShortName>
<BitsName>Mode-C Reply in Gray Notation</BitsName>
</Bits>
<Bits from="16" to="13">
<BitsShortName>spare</BitsShortName>
<BitsName>Spare bit(s) set to 0</BitsName>
<BitsConst>0</BitsConst>
</Bits>
<Bits bit="12">
<BitsShortName>QC1</BitsShortName>
<BitsValue val="0">High quality pulse C1</BitsValue>
<BitsValue val="1">Low quality pulse C1</BitsValue>
</Bits>
<Bits bit="11">
<BitsShortName>QA1</BitsShortName>
<BitsValue val="0">High quality pulse A1</BitsValue>
<BitsValue val="1">Low quality pulse A1</BitsValue>
</Bits>
<Bits bit="10">
<BitsShortName>QC2</BitsShortName>
<BitsValue val="0">High quality pulse C2</BitsValue>
<BitsValue val="1">Low quality pulse C2</BitsValue>
</Bits>
<Bits bit="9">
<BitsShortName>QA2</BitsShortName>
<BitsValue val="0">High quality pulse A2</BitsValue>
<BitsValue val="1">Low quality pulse A2</BitsValue>
</Bits>
<Bits bit="8">
<BitsShortName>QC4</BitsShortName>
<BitsValue val="0">High quality pulse C4</BitsValue>
<BitsValue val="1">Low quality pulse C4</BitsValue>
</Bits>
<Bits bit="7">
<BitsShortName>QA4</BitsShortName>
<BitsValue val="0">High quality pulse A4</BitsValue>
<BitsValue val="1">Low quality pulse A4</BitsValue>
</Bits>
<Bits bit="6">
<BitsShortName>QB1</BitsShortName>
<BitsValue val="0">High quality pulse B1</BitsValue>
<BitsValue val="1">Low quality pulse B1</BitsValue>
</Bits>
<Bits bit="5">
<BitsShortName>QD1</BitsShortName>
<BitsValue val="0">High quality pulse D1</BitsValue>
<BitsValue val="1">Low quality pulse D1</BitsValue>
</Bits>
<Bits bit="4">
<BitsShortName>QB2</BitsShortName>
<BitsValue val="0">High quality pulse B2</BitsValue>
<BitsValue val="1">Low quality pulse B2</BitsValue>
</Bits>
<Bits bit="3">
<BitsShortName>QD2</BitsShortName>
<BitsValue val="0">High quality pulse D2</BitsValue>
<BitsValue val="1">Low quality pulse D2</BitsValue>
</Bits>
<Bits bit="2">
<BitsShortName>QB4</BitsShortName>
<BitsValue val="0">High quality pulse B4</BitsValue>
<BitsValue val="1">Low quality pulse B4</BitsValue>
</Bits>
<Bits bit="1">
<BitsShortName>QD4</BitsShortName>
<BitsValue val="0">High quality pulse D4</BitsValue>
<BitsValue val="1">Low quality pulse D4</BitsValue>
</Bits>
</Fixed>
</DataItemFormat>
<DataItemNote>
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.
</DataItemNote>
</DataItem>
<DataItem id="120">
<DataItemName>Measured Radial Doppler Speed</DataItemName>
<DataItemDefinition>
Radial component of the ground speed as measured by means of Doppler filter banks in radar signal processors.
</DataItemDefinition>
<DataItemFormat desc="1-octet fixed length data item.">
<Fixed length="1">
<Bits from="8" to="1" encode="signed">
<BitsShortName>MRDS</BitsShortName>
<BitsName>Measured Radial Doppler Speed</BitsName>
<BitsUnit scale="0.00390625">NM/s</BitsUnit>
</Bits>
</Fixed>
</DataItemFormat>
<DataItemNote>
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.
</DataItemNote>
</DataItem>
<DataItem id="130">
<DataItemName>Radar Plot Characteristics</DataItemName>
<DataItemDefinition>
Additional information on the quality of the target report.
</DataItemDefinition>
<DataItemFormat desc="Variable data item.">
<Variable>
<Fixed length="1">
<Bits from="8" to="2">
<BitsShortName>IND</BitsShortName>
<BitsName>Indicator</BitsName>
</Bits>
<Bits bit="1" fx="1">
<BitsShortName>FX</BitsShortName>
<BitsName>Extension Indicator</BitsName>
<BitsValue val="0">End of Data Item</BitsValue>
<BitsValue val="1">Extension</BitsValue>
</Bits>
</Fixed>
</Variable>
</DataItemFormat>
<DataItemNote>
Notes:
- The actual meaning of the bits is application dependent.&quot;
- This Data Item may contain parameters such as plot runlength
(primary and secondary), difference between primary and secondary
derived azimuth, pulse amplitude, etc.
</DataItemNote>
</DataItem>
<DataItem id="131">
<DataItemName>Received Power</DataItemName>
<DataItemDefinition>
Measurement of the received power.
</DataItemDefinition>
<DataItemFormat desc="1-octet fixed length data item.">
<Fixed length="1">
<Bits from="8" to="1" encode="signed">
<BitsShortName>RP</BitsShortName>
<BitsName>Received Power</BitsName>
<BitsUnit scale="1.0">dBm</BitsUnit>
</Bits>
</Fixed>
</DataItemFormat>
<DataItemNote>
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.
</DataItemNote>
</DataItem>
<DataItem id="141">
<DataItemName>Truncated Time of Day</DataItemName>
<DataItemDefinition>
Absolute time stamping expressed as Coordinated Universal Time (UTC) time.
</DataItemDefinition>
<DataItemFormat desc="2-octet fixed length data item.">
<Fixed length="2">
<Bits from="16" to="1" encode="unsigned">
<BitsShortName>TToD</BitsShortName>
<BitsName>Truncated Time of Day</BitsName>
<BitsUnit scale="0.0078125">s</BitsUnit>
</Bits>
</Fixed>
</DataItemFormat>
<DataItemNote>
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 &quot;all ones&quot;
value to an &quot;all zeros&quot; 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].
</DataItemNote>
</DataItem>
<DataItem id="150">
<DataItemName>Presence of X-Pulse</DataItemName>
<DataItemDefinition>
Presence of the X-Pulse for the various modes applied in the interrogation interlace pattern.
</DataItemDefinition>
<DataItemFormat desc="1-octet fixed length data item.">
<Fixed length="1">
<Bits bit="8">
<BitsShortName>XA</BitsShortName>
<BitsValue val="0">Default</BitsValue>
<BitsValue val="1">X-pulse received in Mode-3/A reply</BitsValue>
</Bits>
<Bits bit="7">
<BitsShortName>spare</BitsShortName>
<BitsName>Spare bit(s) set to 0</BitsName>
<BitsConst>0</BitsConst>
</Bits>
<Bits bit="6">
<BitsShortName>XC</BitsShortName>
<BitsValue val="0">Default</BitsValue>
<BitsValue val="1">X-pulse received in Mode-C reply</BitsValue>
</Bits>
<Bits from="5" to="4">
<BitsShortName>spare</BitsShortName>
<BitsName>Spare bit(s) set to 0</BitsName>
<BitsConst>0</BitsConst>
</Bits>
<Bits bit="3">
<BitsShortName>X2</BitsShortName>
<BitsValue val="0">Default</BitsValue>
<BitsValue val="1">X-pulse received in Mode-2 reply</BitsValue>
</Bits>
<Bits from="2" to="1">
<BitsShortName>spare</BitsShortName>
<BitsName>Spare bit(s) set to 0</BitsName>
<BitsConst>0</BitsConst>
</Bits>
</Fixed>
</DataItemFormat>
<DataItemNote>
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.
</DataItemNote>
</DataItem>
<DataItem id="161">
<DataItemName>Track Plot Number</DataItemName>
<DataItemDefinition>
An integer value representing a unique reference to a track/plot record within a particular track/plot file.
</DataItemDefinition>
<DataItemFormat desc="2-octet fixed length data item.">
<Fixed length="2">
<Bits from="16" to="1">
<BitsShortName>TPN</BitsShortName>
<BitsName>Track Plot Number</BitsName>
</Bits>
</Fixed>
</DataItemFormat>
<DataItemNote>
Note:
- The differentiation between track and plot number is either implicit
or is made via the Target Report Descriptor (Data Item I001/020).
</DataItemNote>
</DataItem>
<DataItem id="170">
<DataItemName>Track Status</DataItemName>
<DataItemDefinition>
Status of track derived either from primary and/or secondary radar information.
</DataItemDefinition>
<DataItemFormat desc="Variable data item.">
<Variable>
<Fixed length="1">
<Bits bit="8">
<BitsShortName>CON</BitsShortName>
<BitsValue val="0">Confirmed Track</BitsValue>
<BitsValue val="1">Track in initialisation phase</BitsValue>
</Bits>
<Bits bit="7">
<BitsShortName>RAD</BitsShortName>
<BitsValue val="0">Primary track</BitsValue>
<BitsValue val="1">SSR/Combined track</BitsValue>
</Bits>
<Bits bit="6">
<BitsShortName>MAN</BitsShortName>
<BitsValue val="0">Default</BitsValue>
<BitsValue val="1">Aircraft manoeuvring</BitsValue>
</Bits>
<Bits bit="5">
<BitsShortName>DOU</BitsShortName>
<BitsValue val="0">Default</BitsValue>
<BitsValue val="1">Doubtful plot to track association</BitsValue>
</Bits>
<Bits bit="4">
<BitsShortName>RDPC</BitsShortName>
<BitsName>Radar Data Processing Chain</BitsName>
<BitsValue val="0">RDP Chain 1</BitsValue>
<BitsValue val="1">RDP Chain 2</BitsValue>
</Bits>
<Bits bit="3">
<BitsShortName>spare</BitsShortName>
<BitsName>Spare bit(s) set to 0</BitsName>
<BitsConst>0</BitsConst>
</Bits>
<Bits bit="2">
<BitsShortName>GHO</BitsShortName>
<BitsValue val="0">Default</BitsValue>
<BitsValue val="1">Ghost track</BitsValue>
</Bits>
<Bits bit="1" fx="1">
<BitsShortName>FX</BitsShortName>
<BitsName>Extension Indicator</BitsName>
<BitsValue val="0">End of Data Item</BitsValue>
<BitsValue val="1">Extension</BitsValue>
</Bits>
</Fixed>
<Fixed length="1">
<Bits bit="8">
<BitsShortName>TRE</BitsShortName>
<BitsValue val="0">Default</BitsValue>
<BitsValue val="1">Last report for a track</BitsValue>
</Bits>
<Bits from="7" to="2">
<BitsShortName>spare</BitsShortName>
<BitsName>Spare bit(s) set to 0</BitsName>
<BitsConst>0</BitsConst>
</Bits>
<Bits bit="1" fx="1">
<BitsShortName>FX</BitsShortName>
<BitsName>Extension Indicator</BitsName>
<BitsValue val="0">End of Data Item</BitsValue>
<BitsValue val="1">Extension</BitsValue>
</Bits>
</Fixed>
</Variable>
</DataItemFormat>
<DataItemNote>
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.
</DataItemNote>
</DataItem>
<DataItem id="200">
<DataItemName>Calculated Track Velocity in Polar Co-ordinates</DataItemName>
<DataItemDefinition>
Calculated track velocity expressed in polar co-ordinates.
</DataItemDefinition>
<DataItemFormat desc="4-octet fixed length data item.">
<Fixed length="4">
<Bits from="32" to="17" encode="unsigned">
<BitsShortName>GSP</BitsShortName>
<BitsName>Calculated Groundspeed</BitsName>
<BitsUnit scale="0.00006103515625">NM/s</BitsUnit>
</Bits>
<Bits from="16" to="1" encode="unsigned">
<BitsShortName>HDG</BitsShortName>
<BitsName>Calculated Heading</BitsName>
<BitsUnit scale="0.0054931640625">deg</BitsUnit>
</Bits>
</Fixed>
</DataItemFormat>
</DataItem>
<DataItem id="210">
<DataItemName>Track Quality</DataItemName>
<DataItemDefinition>
Relative track quality.
</DataItemDefinition>
<DataItemFormat desc="Variable data item.">
<Variable>
<Fixed length="1">
<Bits from="8" to="2">
<BitsShortName>QI</BitsShortName>
<BitsName>Relative Track Quality</BitsName>
</Bits>
<Bits bit="1" fx="1">
<BitsShortName>FX</BitsShortName>
<BitsName>Extension Indicator</BitsName>
<BitsValue val="0">End of Data Item</BitsValue>
<BitsValue val="1">Extension</BitsValue>
</Bits>
</Fixed>
</Variable>
</DataItemFormat>
<DataItemNote>
Note:
- Actual bit signification is application dependent.
</DataItemNote>
</DataItem>
<DataItem id="SP">
<DataItemName>Special Purpose Field</DataItemName>
<DataItemDefinition>
Special Purpose Field
</DataItemDefinition>
<DataItemFormat desc="Explicit data item.">
<Explicit>
<Fixed length="1">
<Bits from="8" to="1">
<BitsShortName>VAL</BitsShortName>
</Bits>
</Fixed>
</Explicit>
</DataItemFormat>
</DataItem>
<DataItem id="RFS">
<DataItemName>Random Field Sequencing</DataItemName>
<DataItemDefinition>
Random Field Sequencing
</DataItemDefinition>
<DataItemFormat desc="Explicit data item.">
<Explicit>
<Fixed length="1">
<Bits from="8" to="1">
<BitsShortName>VAL</BitsShortName>
</Bits>
</Fixed>
</Explicit>
</DataItemFormat>
</DataItem>
<UAP>
<UAPItem bit="0" frn="1">010</UAPItem>
<UAPItem bit="1" frn="2">020</UAPItem>
<UAPItem bit="2" frn="3">040</UAPItem>
<UAPItem bit="3" frn="4">070</UAPItem>
<UAPItem bit="4" frn="5">090</UAPItem>
<UAPItem bit="5" frn="6">130</UAPItem>
<UAPItem bit="6" frn="7">141</UAPItem>
<UAPItem bit="7" frn="FX" len="-">-</UAPItem>
<UAPItem bit="8" frn="8">050</UAPItem>
<UAPItem bit="9" frn="9">120</UAPItem>
<UAPItem bit="10" frn="10">131</UAPItem>
<UAPItem bit="11" frn="11">080</UAPItem>
<UAPItem bit="12" frn="12">100</UAPItem>
<UAPItem bit="13" frn="13">060</UAPItem>
<UAPItem bit="14" frn="14">030</UAPItem>
<UAPItem bit="15" frn="FX" len="-">-</UAPItem>
<UAPItem bit="16" frn="15">150</UAPItem>
<UAPItem bit="17" frn="16">-</UAPItem>
<UAPItem bit="18" frn="17">-</UAPItem>
<UAPItem bit="19" frn="18">-</UAPItem>
<UAPItem bit="20" frn="19">-</UAPItem>
<UAPItem bit="21" frn="20">SP</UAPItem>
<UAPItem bit="22" frn="21">RFS</UAPItem>
<UAPItem bit="23" frn="FX" len="-">-</UAPItem>
</UAP>
<UAP>
<UAPItem bit="0" frn="1">010</UAPItem>
<UAPItem bit="1" frn="2">020</UAPItem>
<UAPItem bit="2" frn="3">161</UAPItem>
<UAPItem bit="3" frn="4">040</UAPItem>
<UAPItem bit="4" frn="5">042</UAPItem>
<UAPItem bit="5" frn="6">200</UAPItem>
<UAPItem bit="6" frn="7">070</UAPItem>
<UAPItem bit="7" frn="FX" len="-">-</UAPItem>
<UAPItem bit="8" frn="8">090</UAPItem>
<UAPItem bit="9" frn="9">141</UAPItem>
<UAPItem bit="10" frn="10">130</UAPItem>
<UAPItem bit="11" frn="11">131</UAPItem>
<UAPItem bit="12" frn="12">120</UAPItem>
<UAPItem bit="13" frn="13">170</UAPItem>
<UAPItem bit="14" frn="14">210</UAPItem>
<UAPItem bit="15" frn="FX" len="-">-</UAPItem>
<UAPItem bit="16" frn="15">050</UAPItem>
<UAPItem bit="17" frn="16">080</UAPItem>
<UAPItem bit="18" frn="17">100</UAPItem>
<UAPItem bit="19" frn="18">060</UAPItem>
<UAPItem bit="20" frn="19">030</UAPItem>
<UAPItem bit="21" frn="20">SP</UAPItem>