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-2 Technical Provisions for Mode S Services and Extended Squitter Register number Assignment Maximum update interval 0516 Extended Squitter Airborne Position 0.2 s 0616 Extended Squitter Surface Position 0.2 s 0716 Extended Squitter Status 1.0 s 0816 Extended Squitter Identification and Category 15.0 s 0916 Extended Squitter Airborne Velocity 1.3 s 0A16 Extended Squitter Event-Driven Information variable 6116 Extended Squitter Aircraft Status 1.0 s 6216 Target State and Status Information 0.5 s 6316-6416 Reserved for Extended Squitter 6516 Extended Squitter Aircraft Operational Status 2.5 s 6616-6F16 Reserved for Extended Squitter Notes.– 1. The term “minimum update rate” is used in the document. The minimum update rate is obtained when data is loaded in one register field once every maximum update interval. 2. Register 0A16 is not to be used for GICB or ACAS crosslink readout. 3. If Extended Squitter is implemented, then Register 0816 is not cleared or ZEROed once either Flight Identification or Aircraft Registration data has been loaded into the Register during the current power-on cycle. Register 0816 is not cleared since it provides information that is fundamental to track file management in the ADS-B environment. Refer to §C.2.4.3.3 for implementation guidelines regarding Register 0816. 4. These registers define version 1 extended squitters. B.2.2 GENERAL CONVENTIONS ON DATA FORMATS General conventions on data formats shall be as specified in §A.2.2. B.2.3 EXTENDED SQUITTER FORMATS Draft This section defines the formats and coding that shall be used for extended squitter ADS-B messages. When the extended squitter capability is implemented as an extended squitter/non-transponder device (ES/NT, Annex 10, Volume IV, §3.1.2.8.7), the convention for register numbering shall not be required. However, the data content and the transmit times for any ES/NT device shall be the same as specified for the transponder case. B.2.3.1 FORMAT TYPE CODES The first 5-bit (“ME” bits 1–5, Message bits 33–37) field in every Mode S extended squitter message shall contain the format TYPE. The format TYPE shall differentiate the messages into several classes: Airborne Position, Airborne Velocity, Surface Position, Identification, Aircraft Intent, Aircraft State, etc. In addition, the format TYPE shall also encode the Navigation Integrity Category (NIC) of the source used for the position report. The format TYPE shall also differentiate the Airborne Messages as to the TYPE of their altitude measurements: barometric pressure-altitude or GNSS height (HAE). The 5-bit encoding for format TYPE shall conform to the definition contained in the following table: DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
Appendix B B-3 TYPE code Subtype code 0 Not present NIC supplement Not applicable Format (message type) No position information(airborne or surface position) Horizontal containment radius limit (RC) Navigation integrity category (NIC) RC unknown NIC = 0 Barometric altitude or no altitude information Altitude type Notes 1 Category set D 2 Not Not Aircraft identification Not Not Not Category set C 3 present applicable and category(§B.2.3.4) applicable applicable applicable Category set B 4 5 Not 0 Surface RC < 7.5 m NIC = 11 6 present 0 position(§B.2.3.3) RC < 25 m NIC = 10 7 8 1 RC < 75 m NIC = 9 0 RC < 0.1 NM (185.2 m) NIC = 8 0 RC > 0.1 NM (185.2 m) or unknown NIC = 0 No altitude information 1, 2, 3 Category set A 9 Not 0 Airborne position RC < 7.5 m and VPL < 11 m NIC = 11 5 10 present 0 (§B.2.3.2) RC < 25 m and VPL < 37.5 m NIC = 10 5 11 1 RC < 75 m and VPL < 112 m NIC = 9 0 RC < 0.1 NM (185.2 m) NIC = 8 12 0 RC < 0.2 NM (370.4 m) NIC = 7 13 1 RC < 0.6 NM (1111.2 m) 0 RC < 0.5 NM (926 m) NIC = 6 14 0 RC < 1.0 NM (1852 m) NIC = 5 15 0 RC < 2 NM (3.704 km) NIC = 4 16 1 RC < 4 NM (7.408 km) NIC = 3 0 RC < 8 NM (14.816 km) NIC = 2 17 0 RC < 20 NM (37.04 km) NIC = 1 18 19 0 0 Not Reserved 1 — 4 applicable Airborne velocity (§B.2.3.5) 5 — 7 Reserved RC > 20 NM (37.04 km) or unknown NIC = 0 Not applicable Not applicable Barometric altitude Difference between “barometric altitude” and “GNSS height (HAE)” Draft 20 Not 0 Airborne RC < 7.5 m and VPL < 11 m NIC = 11 GNSS height 2, 5 21 present 0 position(§B.2.3.2) RC < 25 m and VPL < 37.5 m NIC = 10 (HAE) 2, 5 22 23 24 DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris 0 0 Not Test message 1 — 6 applicable Reserved 7 Allocated for national use 0 Reserved for surface system status RC > 25 m or VPL > 37.5 m or RC or VPL are unknown 1 Surface System Status (Allocated for National Use) 2 – 7 Reserved 25 26 Reserved 27 Reserved for trajectory change 28 0 Reserved 1 Emergency/priority status (§B.2.3.8) 2 ACAS RA broadcast 3 — 7 Reserved NIC = 0 DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris 6 5, 6 7 2
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Appendix C C-5 Table C-2. “TYPE
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Msg Bit # “ME” Bit # Appendix C
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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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