Technical Provisions for Mode S Services and Extended Squitter

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DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris C-82 Technical Provisions for Mode S Services and Extended Squitter C.4 ADS-B Rebroadcast Service – Formats and Coding C.4.1 INTRODUCTION The TIS-B MASPS, RTCA/DO-286B defines an “ADS-B Rebroadcast Service”, as a “Fundamental TIS-B Service,” that may be provided. The Messages of the ADS-B Rebroadcast Service are not transmitted by aircraft, but by ADS-B ground stations. Notes.— 1. This section of Appendix A defines the formats and coding for an ADS-B Rebroadcast Service (see the TIS-B MASPS, RTCA/DO-286B, §1.4.1) based on the same 112-bit 1090 MHz Extended Squitter signal transmission that is used for DF=17 ADS-B Messages on 1090 MHz. 2. The ADS-B Rebroadcast Service complements the operation of ADS-B and the Fundamental TIS-B Service (see the TIS-B MASPS, RTCA/DO-286B, §1.4.1) by providing ground-to-air rebroadcast of ADS-B data about aircraft that are not equipped for 1090 MHz Extended Squitter ADS-B, but are equipped with an alternate form of ADS-B (e.g., Universal Access Transceiver (UAT)). The basis for the ADS-B Rebroadcast transmission is the ADS-B Report received at the ground station using a receiver compatible with the alternate ADS-B data link. 3. The ADS-B Rebroadcast ground-to-air transmissions use the same signal formats as the DF=17 1090 MHz Extended Squitter ADS-B and can therefore be accepted by a 1090 MHz ADS-B Receiving Subsystem, with the exceptions identified in the following sections. C.4.2 ADS-B REBROADCAST FORMAT DEFINITION ADS-B Rebroadcast information is transmitted using the 112-bit Mode S DF=18 format specified in Figure C- 11. C.4.3 CONTROL FIELD ALLOCATION The content of the DF=18 transmission is defined by the value of the Control Field (CF). As specified in Table C-37, ADS-B Rebroadcasts (i.e., ADS-R) transmissions shall use CF=6 and ADS-R Management information transmissions (i.e., defining ADS-R Service Volume and service availability) shall use CF=4. Draft C.4.4 ADS-B REBROADCAST SURVEILLANCE MESSAGE DEFINITIONS The Rebroadcast of ADS-B information on the 1090 MHz Extended Squitter data link is accomplished by utilizing the same ADS-B Message formats defined in Figure C-1 through Figure C-10, with the exception of the need to transmit an indication to the 1090 MHz Receiving Subsystem as to the type of identity associated with the aircraft data being reported in the ADS-B Rebroadcast Message. This identification is performed using the ICAO/Mode A Flag (IMF), which was previously discussed in §C.3.4.1.1 for the TIS-B transmissions. The insertion of this one bit into the ADS-B Messages identified below allows the ADS-B Receiving Subsystem to interpret the Address Field (AF) in the following manner: IMF = 0 indicates that the ADS-B Rebroadcast data is identified by an ICAO 24-bit Address IMF = 1 indicates that the ADS-B Rebroadcast data is identified by an anonymous 24-bit Address C.4.4.1 REBROADCAST OF ADS-B AIRBORNE POSITION MESSAGES The ADS-B Receiving Subsystem receives, decodes and processes the “ME” Field of the ADS-R Airborne Position Messages, and updates and maintains ADS-R Reports with the decoded data in accordance with §C.3.5. The format is identical to the Airborne Position Message specified in section §C.2.3.2 and Figure C- 1, except that “ME” bit 8 is redefined to be the ICAO/Mode A Flag (IMF). DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris Appendix C C-83 C.4.4.2 ADS-R SURFACE POSITION MESSAGE The ADS-B Receiving Subsystem receives, decodes and processes the “ME” Field of the ADS-R Surface Position Messages, and updates and maintains ADS-R Reports with the decoded data in accordance with §C.3.5. The format is identical to the ADS-B Surface Position Message specified in section §C.2.3.3 and Figure C-2, except that “ME” bit 21 is redefined to be the ICAO/Mode A Flag (IMF). C.4.4.3 ADS-R AIRCRAFT IDENTIFICATION AND CATEGORY MESSAGE The ADS-B Receiving Subsystem receives, decodes and processes the “ME” Field of the ADS-R Aircraft Identification and Category Messages, and updates and maintains ADS-R Reports with the decoded data in accordance with §C.3.5. The format is as specified in section §C.2.3.4 and Figure C-4. Note.— Any Rebroadcast Aircraft Identification and Category Message does not contain the IMF bit since aircraft using an anonymous 24-bit address will not provide identity and category information. C.4.4.4 ADS-R AIRBORNE VELOCITY MESSAGE The ADS-B Receiving Subsystem receives, decodes and processes the “ME” Field of the ADS-R Airborne Velocity Messages, and updates and maintains ADS-R Reports with the decoded data in accordance with §C.3.5. The formats are identical to the ADS-B Airborne Velocity Messages specified in section §C.2.3.5.1 and Figure C-5 for Subtype 1 & 2 Messages, and in section §C.2.3.5.2 and Figure C-6 for Subtype 3 & 4 Messages, except that “ME” bit 9 is redefined to be the ICAO/Mode A Flag (IMF).. Note.— Bit 10 of the “ME” field in ADS-B Version One (1) is the IFR Capability Flag which is not conveyed in ADS-B Version Two (2) ADS-B Transmitting Subsystems. C.4.4.5 ADS-R EXTENDED SQUITTER AIRCRAFT STATUS MESSAGE The ADS-B Receiving Subsystem receives, decodes and processes the “ME” Field of the ADS-R Extended Squitter Aircraft Status Messages, and updates and maintains ADS-R Reports with the decoded data in accordance with §C.3.5. The format is identical to the Aircraft Emergency/Priority Status Message specified in section §C.2.3.7.3 and Figure C-8a, except that “ME” bit 56 is redefined to be the ICAO/Mode A Flag (IMF). Draft C.4.4.6 ADS-R TARGET STATE AND STATUS MESSAGE The ADS-B Receiving Subsystem receives, decodes and processes the “ME” Field of the Rebroadcast Target State and Status Messages, and updates and maintains ADS-R Reports with the decoded data in accordance with §C.3.5. The format is identical to the ADS-B Target State and Status Message (Subtype=1) in section §C.2.3.9 and Figure C-9, except that “ME” bit 51 is redefined to be the ICAO/Mode A Flag (IMF). C.4.4.7 ADS-R AIRCRAFT OPERATIONAL STATUS MESSAGE The ADS-B Receiving Subsystem receives, decodes and processes the “ME” Field of the Rebroadcast Aircraft Operational Status Messages, and updates and maintains ADS-R Reports with the decoded data in accordance with §C.3.5. The format is identical to the ADS-B Aircraft Operational Status Message specified in section §C.2.3.10 and Figure C-10, except that “ME” bit 56 is redefined to be the ICAO/Mode A Flag (IMF) and bit 20 of the Capability Class Code conveys the NIC Supplement-B. 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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