Technical Provisions for Mode S Services and Extended Squitter

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B-6 Technical Provisions for Mode S Services and Extended Squitter B.2.3.1.2 SURFACE POSITION MESSAGE TYPE CODE B.2.3.1.2.1 Surface position message TYPE Code if containment radius is available If RC (horizontal containment radius) information is available from the navigation data source, then the ADS-B Transmitting Subsystem shall use RC to determine the TYPE Code used in the Surface Position Message in accordance with the table of §B.2.3.1. Note.— If the position information comes from a GNSS receiver that conforms to the ARINC 743A characteristic, a suitable source of information for the containment radius (RC), is ARINC 429 label 130 from that GNSS receiver. B.2.3.1.2.2 Surface position message TYPE Code if containment radius is not available If RC (horizontal containment radius) information is not available from the navigation data source, then the ADS-B Transmitting Subsystem shall indicate NIC=0 by selecting a TYPE Code of 0 or 8 in the Surface Position Messages, as follows: a) the ADS-B Transmitting Subsystem shall set the TYPE subfield to ZERO if valid horizontal position information is not available; and b) the ADS-B Transmitting Subsystem shall set the TYPE subfield to 8 if valid horizontal position information is available. (This TYPE code indicates that containment radius, RC, is either unknown or greater than or equal to 0.1 NM.) B.2.3.1.3 TYPE CODE BASED ON HORIZONTAL PROTECTION LEVEL If valid horizontal position information is available, then the “TYPE” code in the Surface Position Message shall be set in the range from “5” to “8.” Draft a) If RC (Horizontal Containment Radius) information is available from the navigation data source, the “TYPE” coding shall be selected according to the RC value, in accordance with the table of §B.2.3.1. b) If RC is not available from the navigation data source, then the “TYPE” coding shall be set to 8. B.2.3.2 AIRBORNE POSITION FORMAT The airborne position squitter shall be formatted as specified in §A.2.3.2. B.2.3.3 SURFACE POSITION FORMAT The surface position squitter shall be formatted as specified in the definition of register number 0616 and in the following paragraphs. B.2.3.3.1 MOVEMENT DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris The movement field shall be formatted as specified in §A.2.3.3.1. 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 B B-7 B.2.3.3.2 HEADING/GROUND TRACK B.2.3.3.2.1 Heading/ground track status This 1-bit field shall define the validity of the heading/ground track value. Coding for this field shall be as follows: 0=invalid and 1=valid. Note.— If a source of A/V heading is not available to the ADS-B transmitting subsystem, but a source of ground track angle is available, then ground track angle may be used instead of heading, provided that the status bit for heading subfield is set to ZERO (0) whenever the ground track angle is not a reliable indication of the A/V’s Heading. (The ground track angle is not a reliable indication of the A/V’s heading when the A/V’s ground speed is low.) B.2.3.3.2.2 Heading/ground track value This 7-bit (14-20) field shall define the direction (in degrees clockwise from true or magnetic north) of aircraft motion on the surface. The value shall be encoded as an unsigned angular weighted binary numeral, with an MSB of 180 degrees and an LSB of 360/128 degrees, with zero indicating true north. The data in the field shall be rounded to the nearest multiple of 360/128 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 (see §B.2.3.10.13). B.2.3.3.3 COMPACT POSITION REPORTING (CPR) FORMAT (F) The CPR format field shall be formatted as specified in §A.2.3.3.3. B.2.3.3.4 TIME SYNCHRONIZATION (T) Draft The time synchronization field shall be formatted as specified in §A.2.3.3.4. B.2.3.3.5 LATITUDE/LONGITUDE The latitude/longitude field shall be formatted as specified in §A.2.3.3.5. B.2.3.4 IDENTIFICATION AND CATEGORY FORMAT The identification and category squitter shall be formatted as specified in §A.2.3.4. B.2.3.5 AIRBORNE VELOCITY FORMAT The airborne velocity squitter shall be formatted as specified in the definition of register number 0916 and in the following paragraphs. 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 C C-5 Table C-2. “TYPE
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Appendix C C-11 C.2.3.2.2 Time Sync
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Appendix C C-25 Notes.— DRAFT - W
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Msg Bit # “ME” Bit # Appendix C
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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-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-23 CD.2.4.7.5 BINARY
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Technical Provisions for Mode S Services and Extended Squitter

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