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-88 Technical Provisions for Mode S Services and Extended Squitter C.5.2.2.3 Movement Notes.— 1. The quantization in the Movement subfield conveyed in Version Two (2) Surface Position Messages is different than the Movement subfield contained in Version Zero (0). The encoding of the Version Zero (0) Movement subfield is contained in §A.2.3.3.1. 2. Note.— ADS-B Applications must use the version number to properly decode the Movement subfield. C.5.2.2.4 ADS-B Version Number Note.— The format of the Aircraft Operational Status Message substantially differs between the ADS-B Version Zero (0) ADS-B Message format shown in Figure A-2-101 and the ADS-B Version Two (2) ADS-B Message format specified in §C.2.3.10 of this Manual. The ADS-B Version Two (2) Aircraft Operational Status Message format includes an explicit ADS-B Version Number subfield (ME bits 41-43). For a ADS-B Version Zero (0) ADS-B Aircraft Operational Status Message, these same bits were unassigned reserved and were expected to be set to a value of ZERO (0). An ADS-B Version Two (2) Receiving Subsystem willshall, as a default, assume the received messages are using ADS-B Version Zero (0) ADS-B Message format unless, or until, an Aircraft Operational Status Message is received and the ADS-B Version Number is confirmed to be other than Zero (0). However, inIn the case of a ADS-B Version Two (2) ADS-B Subsystem’s reception of an Aircraft Operational Status Message, the ADS-B Receiving Subsystem will shall decode “ME” bits 41-43 and determine if the target aircraft is broadcasting messages that are ADS-B Version Zero (0), or Version One (1), or Version Two (2), and then decode the remainder of the message in accordance with the message format applicable to that ADS-B Version Number. Note.— The ADS-B Version Number determined from the decoding of the ADS-B Version Number subfield of the Aircraft Operational Status Message must be retained and associated with the specific target since it is used in determining the applicable formats to be used for the decoding of the other message types. C.5.2.2.5 Emitter Category The ADS-B Report Assembly Function will shall extract “TYPE” and “ADS-B Emitter Category” from the Aircraft Identification and Category Message (Table A-2-8) and encode the “Emitter Category” field. The Emitter Category conveyed in the Aircraft Identification and Category Message is shall be mapped into the ADS-B Report, Emitter Category field as specified by Table A-2-8. However, it must be noted that in Draft Note.—In the ADS-B Version Zero (0) Aircraft Identification and Category Message, the Emitter Category subfield conveys a subset of the Emitter Categories allowed by the ADS-B Report. C.5.2.2.6 A/V Length and Width Code The A/V Length and Width Code is not conveyed by ADS-B Version Zero (0) 1090 MHz ADS-B Messages. This parameter is only included in the ADS-B Report when reporting on an aircraft or vehicle that is on the airport surface. When no A/V Length and Width Code is available, as is the case for target A/V that are broadcasting ADS-B Version Zero (0) ADS-B Messages, the A/V Length and Width Code parameter will shall not be included in the ADS-B Report. 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-89 C.5.2.2.7 Emergency/Priority Status The Emergency/Priority Status conveyed in the Aircraft Status Message (Table A-2-97) will shall be directly mapped into the ADS-B Report, Emergency/Priority Status field as specified in §C.2.3.7.3. However, it must be noted that in the Note.— In the ADS-B Version Zero (0) Aircraft Extended Squitter Status Message, the Emergency/Priority Status subfield conveys a subset of the Emergency/Priority Status categories allowed by an ADS-B Report. C.5.2.2.8 Capability Codes The ADS-B Version Zero (0) Operational Status Message (Table A-2-101) conveys Control Codes with information limited to TCAS and CDTI capabilities, as shown in Table C-42. The ADS-B Version Zero (0) Aircraft Operational Status Message format specifies coding only for the case of CC-4 (En Route Operational Capabilities). Therefore the CC-1, CC-2 and CC-3 subfields, as specified in Table A-2-101, are toshall be considered reserved and not used for ADS-B Version Zero (0) ADS-B Messages. For the case of CC-4, this 4-bit (bits 9-12) subfield will shall be mapped to the Capability Code field of the ADS-B Report as shown in Table C-42. The remaining bits within the ADS-B Report Capability Code field will shall be set to Zero (0). If no Aircraft Operational Status Message has been received, then the Capability Code field may shall be omitted from the ADS-B Report. Table C-42. En-Route Operational Capabilities Encoding CC-4 Encoding: En Route Operational Capabilities CC-4 Coding Mapping to ADS-B Report (Version Zero (0) Meaning Capability Code field Messages) (Version Zero (0) Messages) Bit 9,10 Bit 11,12 CC Field Bits 11, 12 0 0 TCAS Operational or unknown; CDTI not Operational or unknown 10 0 0 0 1 TCAS Operational or unknown; CDTI Operational 11 1 0 TCAS not Operational; CDTI not Operational or unknown 00 1 1 TCAS not Operational; CDTI Operational 01 Draft C.5.2.2.9 Operational Modes ADS-B Version Zero (0) messages conformant to formats in Appendix A, do not define coding for the Operational Mode subfield of the Operational Status Message (Table A-2-101). Therefore the OM-1, OM-2, OM-3 and OM-4 subfields, as shown in Table A-2-101, are toshall be considered reserved and not used for ADS-B Version Zero (0) Messages. ADS-B Reports for target aircraft/vehicles broadcasting ADS-B Version Zero (0) ADS-B Messages will shall not include the Operational Mode field in the report. C.5.2.2.10 Navigation Accuracy Category for Position (NACP) The ADS-B Version Zero (0) ADS-B Surface and Airborne Position Messages have associated with each specific TYPE code a corresponding Horizontal Protection Limit and a 95% Containment Radius (i.e., position error). For a ADS-B Version Two (2) Receiving Subsystem, the TYPE codes of the received ADS-B Version Zero (0) Messages will shall be mapped into the value of the Navigation Accuracy Category for Position (NAC P) as shown in Table C-43 for the purpose of generating the ADS-B Report. DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
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Msg Bit # “ME” Bit # Appendix C
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