Technical Provisions for Mode S Services and Extended Squitter

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B-40 Technical Provisions for Mode S Services and Extended Squitter B.3. CF FIELD CODE DEFINITIONS IN DF=18 ADS-B AND TIS-B MESSAGES B.3.1 INTRODUCTION Note 1.— This section defines the formats and coding for a traffic information service broadcast (TIS-B) service based on the same 112-bit 1 090 MHz signal transmission that is used for ADS-B on 1 090 MHz. Note 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 1 090 MHz ADS-B as an aid to transition to a full ADS-B environment. The basis for this ground surveillance data may be ATC Mode S radar, a surface or approach multilateration system or a multi-sensor data processing system. The TIS-B ground-to-air transmissions use the same signal formats as 1 090 MHz ADS-B and can therefore be accepted by a 1 090 MHz ADS-B receiver. Note 3.— TIS-B service is intended to provide a complete surveillance picture to 1 090 MHz ADS-B users during a transition period. After transition, it also provides a means to cope with a user that has lost its 1 090 MHz ADS-B capability, or is broadcasting incorrect information. B.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 the following table. TIS-B Format Definition Bit # 1 ---- 5 6 --- 8 9 ----- 32 33 ------------------------- 88 89 ---- 112 DF=18Field Names DF[5] CF[3] AA[24] ME[56] PI[24] 10010 MSB MSB MSB MSB MSB LSB LSB LSB LSB LSB Draft B.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 the following table. CF value 2 3 DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris CF Field Code Definitions in DF=18 ADS-B and TIS-B Messages ICAO/Mode A Flag (IMF) Meaning 0 Fine TIS-B message, AA field contains the 24-bit ICAO aircraft address 1 0 1 Fine TIS-B message, AA field contains the 12-bit Mode A code followed by a 12-bit track file number Coarse TIS-B airborne position and velocity message, AA field contains the 24-bit ICAO aircraft address Coarse TIS-B airborne position and velocity message, AA field contains the 12-bit Mode A code followed by a 12-bit track file number. DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
Appendix B B-41 CF value ICAO/Mode A Flag (IMF) 4 N/A 5 6 DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris 0 1 Reserved 0 1 Meaning Reserved for TIS-B management message AA field contains TIS-B/ADS-R management information TIS-B messages that relay ADS-B Messages using anonymous 24-bit addresses ADS-B rebroadcast using the same TYPE Codes and message formats as defined for DF=17 ADS-B messages AA field contains the 24-bit ICAO aircraft address ADS-B rebroadcast using the same TYPE Codes and message formats as defined for DF=17 ADS-B messages AA field contains a 24-bit anonymous aircraft address B.3.4 TIS-B SURVEILLANCE MESSAGE DEFINITION B.3.4.1 TIS-B FINE AIRBORNE POSITION MESSAGE The TIS-B fine airborne position ME field shall be formatted as specified in Table B-3-1. B.3.4.1.1 ICAO/MODE A FLAG (IMF) FOR THE AIRBORNE POSITION MESSAGE 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. Draft Note.— The AA field is coded differently for 24-bit addresses and Mode A codes as specified in §B.3.3. B.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). Note.— All zeros in this field indicate that there is no altitude data. B.3.4.1.3 COMPACT POSITION REPORTING (CPR) FORMAT (F) This field shall be set as specified in 2.3.2.1 of Appendix A. B.3.4.1.4 LATITUDE/LONGITUDE The Latitude/Longitude fields in the TIS-B fine Airborne Position Message shall be set as specified in §A.2.3.2.3. DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
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Technical Provisions for Mode S Services and Extended Squitter

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