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-16 Technical Provisions for Mode S Services and Extended Squitter The supersonic version of the velocity coding shall be used if either the East-West OR North-South velocities exceed 1022 knots. A switch to the normal velocity coding shall be made if both the East-West AND North- South velocities drop below 1000 knots. C.2.3.5.2 Subtypes 3 and 4 Subtypes 3 and 4 of the Airborne Velocity format shall be used when the transmitting aircraft's velocity over ground is not known. These Subtypes shall substitute Airspeed and Heading for the velocity over ground. Subtype 3 shall be used at subsonic velocities, while Subtype 4 shall be reserved for Airspeeds in excess of 1000 knots. The Air Referenced Velocity is contained in the Airborne Velocity Subtypes 3 and 4, and the velocity information is required from only certain classes of ADS-B equipped aircraft. Note.— Air Referenced Velocity Messages may be received from airborne aircraft that are also broadcasting messages containing ground referenced velocity information. ADS-B Receiving Subsystems conformant to this Manual are required to receive and process ground referenced and Air Referenced Velocity Messages from the same aircraft and output the corresponding reports. Although not required in this Manual, future versions of this Manual will specify under what conditions both ground referenced and air referenced velocity would be transmitted. This is intended to provide compatibility with anticipated future requirements for the transmission of both types of velocity information. This Airborne Velocity Message shall not be broadcast if the only valid data is the Intent Change flag (§C.2.3.5.3). After initialization, broadcast shall be suppressed by loading Register 0916 with ALL ZEROs and then discontinuing updating the register until data input is available again. The supersonic version of the Velocity Message coding shall be used if the Airspeed exceeds 1022 knots. A switch to the normal velocity coding shall be made if the Airspeed drops below 1000 knots. C.2.3.5.3 Intent Change Flag in Airborne Velocity Messages An Intent Change event shall be triggered 4 seconds after the detection of new information being inserted in Registers 4016 to 4216. The code shall remain set for 18 ±1 seconds following an intent change. Intent Change Flag coding: 0 = no change in intent 1 = intent change Notes.— Draft 1. Register 43 16 is not included since it contains dynamic data that will be continuously changing. 2. A four-second delay is required to provide for settling time for intent data derived from manually set devices. C.2.3.5.4 Navigation Accuracy Category for Velocity (NACV) This 3-bit (“ME” bits 11-13, Message bits 43-45) subfield shall indicate the Navigation Accuracy Category for Velocity (NACV) as specified in Table C-5. The ADS-B Transmitting Subsystem shall accept, via an appropriate data interface, data from which the own-vehicle Navigation Accuracy Category for Velocity (NACV) may be determined, and it shall use such data to establish the NACV subfields in transmitted ADS-B Airborne Velocity Messages. If the external data source provides 95% accuracy figures of merit for horizontal velocity, then the ADS-B Transmitting Subsystem shall determine the value of the NAC V field in the Airborne Velocity Messages, Subtypes 1, 2, 3 and 4 according to Table C-5. 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-17 Table C-5. Determining NACV Based on Position Source Declared Horizontal Velocity Error Navigation Accuracy Category for Velocity Coding (Binary) (Decimal) Horizontal Velocity Error 000 0 > 10 m/s 001 1 < 10 m/s 010 2 < 3 m/s 011 3 < 1 m/s 100 4 < 0.3 m/s Note.— A non-excluded satellite failure requires that the NACV parameter be set to ZERO (binary 000) along with RC being set to Unknown to indicate that the velocity error is ≥10 m/s (see §C.2.3.1.1.3 and §C.2.3.1.2.4). C.2.3.5.5 Heading in Airborne Velocity Messages C.2.3.5.5.1 Heading Status This one bit (“ME” bit 14, Message bit 46) subfield in Airborne Velocity Messages, Subtype 3 or 4 shall define the availability of the Heading value. Coding for this field will be: 0=not available and 1=available. C.2.3.5.5.2 Heading Value This 10-bit (“ME” bits 15 – 24, Message bits 47 – 56) subfield in Airborne Velocity Messages, Subtype 3 or 4 shall give the Aircraft Heading (in degrees clockwise from true or magnetic north) when velocity over ground is not available. The Heading shall be encoded as an unsigned Angular Weighted Binary numeral with an MSB of 180 degrees and an LSB of 360/1024 degrees, with ALL ZEROs (binary 00 0000 0000) indicating a value of ZERO degrees. The data in the field shall be rounded to the nearest multiple of 360/1024 degrees. Note.— The reference direction for Heading (whether True North or Magnetic North) is indicated in the Horizontal Reference Direction (HRD) field of the Aircraft Operational Status Message (§C.2.3.10.13). C.2.3.5.6 Difference from Baro Altitude in Airborne Velocity Messages Draft This 8-bit (“ME” bits 49 – 56, Message bits 81 – 88) subfield shall give the signed difference between barometric and GNSS altitude. Coding for this field shall be as indicated in Figure C-5 and Figure C-6. If Airborne Position is being reported using Format TYPE Codes 9 or 10, only GNSS HAE shall be used. For Format TYPE Codes 9 or 10, if GNSS HAE is not available, the field shall be coded with ALL ZEROs. For Format TYPE Codes 11 through 18, either GNSS HAE or altitude MSL shall be used. The basis for the Baro Altitude difference (either GNSS HAE or altitude MSL) shall be used consistently for the reported difference. Note.— The difference between Baro Altitude and GNSS height above ellipsoid (HAE) is preferred. However, GNSS altitude (MSL) may be used when Airborne Position is being reported using Format TYPE Codes 11 through 18. DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
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Appendix A A-7 TYPE Code Format Hor
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Appendix A A-13 The supersonic vers
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Appendix A A-15 The transponder sha
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Appendix A A-97 a) the PI sends a T
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Appendix A A-99 This subfield shall
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Appendix A A-101 These channels hav
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Appendix A A-109 A.4. MODE S BROADC
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Appendix A A-111 Note 1.— This st
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Appendix B B-3 TYPE code Subtype co
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Appendix C C-69 Register 6516 DRAFT
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Appendix C C-71 Table C-37. CF Fiel
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Appendix CD CD-3 ACTIONS EVENTS DRA
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Appendix CD CD-7 too many broadcast
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Appendix CD CD-13 CD.2.4.4.1.2 Poss
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Appendix CD CD-15 D.2.4.4.2.1.2 A32
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Appendix CD CD-17 AP/FD mode V/S-FP
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Appendix CD CD-23 CD.2.4.7.5 BINARY
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Appendix CD CD-27 Zone no. DRAFT -
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Appendix CD CD-31 CD.4 IMPLEMENTATI
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Appendix DE DE-7 c. for GNSS, the p
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Appendix DE DE-11 MB FIELD DRAFT -
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Technical Provisions for Mode S Services and Extended Squitter

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