Technical Provisions for Mode S Services and Extended Squitter

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C-70 Technical Provisions for Mode S Services and Extended Squitter C.3 Traffic Information Services – Broadcast (TIS-B) Formats and Coding Notes.— DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris C.3.1 INTRODUCTION 1. This section defines the formats and coding for a Traffic Information Service Broadcast (TIS-B) based on the same 112-bit 1090 MHz signal transmission that is used for ADS-B on 1090 MHz. 2. TIS-B complements the operation of ADS-B by providing ground-to-air broadcast of surveillance data on aircraft that are not equipped for 1090 MHz ADS-B. The basis for this ground surveillance data may be an ATC Mode S radar, a surface or approach multi-lateration system or a multi-sensor data processing system. The TIS-B ground-to-air transmissions use the same signal formats as 1090 MHz ADS-B and can therefore be accepted by a 1090 MHz ADS-B receiver. 3. TIS-B data content on the 1090 MHz signal does not include all of the parameters, such as the System Design Assurance (SDA) and the SIL Supplement, which are normally associated with ADS-B transmissions from aircraft. Those parameters that are not broadcast will need to be provided by the TIS-B Service Provider. 4. TIS-B service is the means for providing a complete surveillance picture to 1090 MHz ADS-B users during a transition period. After transition, it also provides a means to cope with a user that has lost its 1090 MHz ADS-B capability, or is broadcasting incorrect information. C.3.2 TIS-B FORMAT DEFINITION TIS-B information shall be broadcast using the 112-bit Mode S DF=18 format as shown below in Figure C- 11. TIS-B Format Definition Bit # 1 ----- 5 6 --- 8 9 ----- 32 33 --------------------------- 88 89 ---- 112 DF=18 DF CF AA “ME” PI Field [5] [3] [24] [56] [24] Names 10010 MSB MSB MSB MSB MSB LSB LSB LSB LSB LSB Draft Figure C-11. TIS-B Format Definition C.3.3 CONTROL FIELD ALLOCATION The content of the DF=18 transmission shall be defined by the value of the control field, as specified in Table C-37. DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
Appendix C C-71 Table C-37. CF Field Code Definitions in DF=18 ADS-B and TIS-B Messages CF Value ICAO/Mode A Flag (IMF) Meaning 0 N/A ADS-B Message from a non-transponder device, AA field holds 24-bit ICAO aircraft address 1 N/A Reserved for ADS-B Message in which the AA field holds anonymous address or ground vehicle address or fixed obstruction address 0 Fine TIS-B Message, AA field contains the 24-bit ICAO aircraft address 2 Fine TIS-B Message, 1 AA field contains the 12-bit Mode A code followed by a 12-bit track file number 0 Coarse TIS-B Airborne Position and Velocity Message, AA field contains the 24-bit ICAO aircraft address 3 Coarse TIS-B Airborne Position and Velocity Message, 1 AA field contains the 12-bit Mode A code followed by a 12-bit track file number. 4 N/A TIS-B and ADS-R Management Message AA field contains TIS-B/ADS-R management information. 5 0 Fine TIS-B Message AA field contains a non-ICAO 24-bit address 1 Reserved 0 Rebroadcast of ADS-B Message from an alternate data link AA field holds 24-bit ICAO aircraft address 6 Rebroadcast of ADS-B Message from an alternate data link 1 AA field holds anonymous address or ground vehicle address or fixed obstruction address 7 N/A Reserved C.3.4 TIS-B SURVEILLANCE MESSAGE DEFINITION C.3.4.1 TIS-B FINE AIRBORNE POSITION MESSAGE The TIS-B fine airborne position “ME” field shall be formatted as specified in Figure C-12, and described in the following paragraphs. Draft C.3.4.1.1 ICAO/Mode A Flag (IMF) This one-bit field (bit 8) shall indicate the type of identity associated with the aircraft data reported in the TIS- B message. IMF equal to ZERO (0) shall indicate that the TIS-B data is identified by an ICAO 24-bit address. IMF equal to ONE (1) shall indicate that the TIS-B data is identified by a “Mode A” code. A TIS-B report on a primary radar target shall indicate a “Mode A” code of ALL ZEROs. Notes.— DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris 1. The AA field is coded differently for 24-bit addresses and Mode A codes as specified in Table C-24. 2. A target with a ZERO “Mode A” code and a reported altitude is an SSR target. C.3.4.1.2 Pressure Altitude This 12-bit field shall provide the aircraft pressure altitude. This field shall contain barometric altitude encoded in 25 or 100-foot increments (as indicated by the Q Bit). ALL ZEROs in this field shall indicate that there is no altitude data. DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
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Appendix A A-7 TYPE Code Format Hor
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Appendix A A-97 a) the PI sends a T
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Appendix A A-99 This subfield shall
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Appendix A A-109 A.4. MODE S BROADC
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Appendix A A-111 Note 1.— This st
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Appendix B B-3 TYPE code Subtype co
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Appendix B B-17 Coding (Binary) (De
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Appendix B B-19 a) ACAS operational
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Appendix B B-21 Subfield Coding: DR
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Appendix B B-41 CF value ICAO/Mode
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Appendix C C-5 Table C-2. “TYPE
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Technical Provisions for Mode S Services and Extended Squitter

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