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 B-18 Technical Provisions for Mode S Services and Extended Squitter B.2.3.9.15 CAPABILITY/MODE CODES This 2-bit (ME bits 52 — 53, Message bits 84 — 85) subfield shall be used to indicate the current operational status of TCAS/ACAS systems/functions. This subfield shall be encoded as specified in the following table. If an update has not been received from an on-board data source for a Capability/Mode Code data element within the past 2 seconds, then that data element shall be encoded with a value of zero (0). Coding Meaning ME bit 52 = 0 TCAS/ACAS operational or unknown ME bit 52 = 1 TCAS/ACAS not operational ME bit 53 = 0 No TCAS/ACAS Resolution Advisory active ME bit 53 = 1 TCAS/ACAS Resolution Advisory active B.2.3.9.16 EMERGENCY/PRIORITY STATUS This 3-bit (ME bits 54 — 56, message bits 86 — 88) subfield shall be used to provide additional information regarding aircraft status. The Emergency/Priority Status subfield shall be encoded as specified in the following table. If an update has not been received from an on-board data source for the Emergency/Priority Status within the past 5 seconds, then the emergency/priority status subfield shall be encoded with a value indicating no emergency. Coding (Binary) (Decimal) Meaning 000 0 No emergency 001 1 General emergency 010 2 Lifeguard/medical emergency 011 3 Minimum fuel Draft 100 4 No communications 101 5 Unlawful interference 110 6 Downed aircraft 111 7 Reserved B.2.3.10 AIRCRAFT OPERATIONAL STATUS The aircraft operational status message squitter shall be formatted as specified in the definition of register number 6516 and in the following paragraphs. B.2.3.10.1 TRANSMISSION RATE The aircraft operational status (type = 31 and subtype=0, for airborne participants) ADS-B message shall be broadcast at random intervals that are uniformly distributed over the range of 0.7 to 0.9 seconds when the target state and status message (type=29 and subtype=0) is not being broadcast and there has been a change within the past 24 ±1 seconds for the value of any of the following message parameters: DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
Appendix B B-19 a) ACAS operational; b) ACAS resolution advisory active; c) NACP; d) SIL. Otherwise the aircraft operational status (type = 31 and subtype = 0, for airborne participants) ADS-B message shall be broadcast at random intervals that are uniformly distributed over the range of 2.4 to 2.6 seconds. B.2.3.10.2 MESSAGE DELIVERY Message delivery shall be accomplished using the event-driven protocol (see §B.2.3.7). B.2.3.10.3 CAPABILITY CLASS (CC) CODES This 16-bit (ME bits 9–24, Message bits 41–56) subfield in the airborne aircraft operational status message (subtype=0) or 12-bit (ME bits 9–20, message bits 41–52) subfield in the surface aircraft operational status message (subtype=1) shall be used to report the operational capability of the aircraft. Encoding of the CC subfield shall be defined as specified in the following tables. For an ADS-B transmitting subsystem compliant with this appendix, if an update has not been received from an onboard data source within the past 5 seconds for any data element of the capability class codes subfield, then the data associated with that data element shall be considered invalid and so reflected in the encoding of that message element to reflect no capability or unknown capability. Airborne Capability Class (CC) Code for Version 1 Systems Msg Bit # 41 42 43 44 45 46 47 48 49 50 51 – 56 Draft “ME” Bit # 9 10 11 12 13 14 15 16 17 18 19 – 24 Content Subfield Coding: DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris Service level MSBs = 0 0 Not-ACAS CDTI 1. Not-ACAS (Airborne Collision Avoidance System Status) 0 = ACAS operational or unknown 1 = ACAS not installed or not operational 2. CDTI (Cockpit Display of Traffic Information Status) 0 = Traffic display not operational 1 = Traffic display operational Service level LSBs = 0 0 3. ARV (Air-Referenced Velocity Report Capability) 0 = No capability for sending messages to support Air-Referenced Velocity Reports 1 = Capability of sending messages to support Air-Referenced Velocity Reports ARV TS TC Reserved 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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Appendix C C-33 Msg Bit # "ME” Bi
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Appendix C C-59 Register 0516 DRAFT
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Appendix CD CD-3 ACTIONS EVENTS DRA
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Appendix CD CD-13 CD.2.4.4.1.2 Poss
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Appendix CD CD-23 CD.2.4.7.5 BINARY
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Technical Provisions for Mode S Services and Extended Squitter

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