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-72 Technical Provisions for Mode S Services and Extended Squitter C.3.4.1.3 Compact Position Reporting (CPR) Format (F) This field shall be set as specified in §C.2.3.2.1. C.3.4.1.4 Latitude/Longitude The Latitude/Longitude fields in the TIS-B fine Airborne Position Message shall be set as specified in §C.2.3.2.3. C.3.4.2 TIS-B SURFACE POSITION MESSAGE The TIS-B surface position “ME” field shall be formatted as specified in Figure C-13, and described in the following paragraphs. This field shall be set as specified in §C.2.3.3.1. This field shall be set as specified in §C.2.3.3.2.1. This field shall be set as specified in §C.2.3.3.2.2. C.3.4.2.1 Movement C.3.4.2.1.1 Ground Track (True) C.3.4.2.1.1.1 Ground Track Status C.3.4.2.1.1.2 Ground Track Angle C.3.4.2.1.2 ICAO/Mode A Flag (IMF) This one-bit field (bit 21) shall indicate the type of identity associated with the aircraft data reported in the TIS-B message. Coding is specified in §C.3.4.1.1. C.3.4.2.1.3 Compact Position Reporting (CPR) Format (F) This field shall be set as specified in §C.2.3.3.3. Draft C.3.4.2.1.4 Latitude/Longitude The Latitude/Longitude fields in the TIS-B Fine Surface Position Message shall be set as specified in §C.2.3.3.5. C.3.4.3 IDENTIFICATION AND CATEGORY MESSAGE The TIS-B Identification and Category “ME” field shall be formatted as specified in Figure C-14, and described in the following paragraphs. This message shall only be used for aircraft identified with an ICAO 24-bit address. This field shall be set as specified in §C.2.3.4.1. C.3.4.3.1 Aircraft Identification Coding 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-73 C.3.4.4 VELOCITY MESSAGE The TIS-B Velocity “ME” field shall be formatted as specified in the Figure C-15, and described in the following paragraphs, for Subtypes 1 and 2, and in Figure C-16 for Subtypes 3 and 4. C.3.4.4.1 Subtype Field Subtypes 1 through 4 shall be used for the TIS-B Velocity Message. Subtype 1 shall be used for velocities over ground under 1000 knots and Subtype 2 shall be used for aircraft capable of supersonic flight when the velocity over ground might exceed 1022 knots. 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. Subtypes 3 and 4 shall be used when Airspeed and Heading are substituted for velocity over ground. Subtype 3 shall be used at subsonic airspeeds, while Subtype 4 shall be used for aircraft capable of supersonic flight when the Airspeed might exceed 1022 knots. The supersonic version of the Airspeed coding shall be used if the Airspeed exceeds 1022 knots. A switch to the normal Airspeed coding shall be made if the Airspeed drops below 1000 knots. C.3.4.4.2 ICAO/Mode A Flag (IMF) This one-bit field (bit 9) shall indicate the type of identity associated with the aircraft data reported in the TIS- B message. Coding is specified in §C.3.4.1.1. C.3.4.5 COARSE AIRBORNE POSITION MESSAGE The TIS-B coarse airborne position “ME” field shall be formatted as specified in Figure C-17, and described in the following paragraphs. Note.— This message is used if the surveillance source for TIS-B is not of high enough quality to justify the use of the fine formats. An example of such a source is a scanning beam Mode S interrogator. C.3.4.5.1 ICAO/Mode A Flag (IMF) Draft This one-bit field (bit 1) shall indicate the type of identity associated with the aircraft data reported in the TIS- B message. Coding is specified in §C.3.4.1.1. C.3.4.5.2 Service Volume ID (SVID) The 4-bit SVID field shall identify the TIS-B site that delivered the surveillance data. Note.— In the case where TIS-B messages are being received from more than one TIS-B ground stations, the SVID can be used to select coarse messages from a single source. This will prevent the TIS-B track from wandering due to the different error biases associated with different sources. C.3.4.5.3 Pressure Altitude This 12-bit field shall provide the aircraft pressure altitude. This field shall contain barometric altitude encoded in 25 or 100-foot increments (as indicated by the Q Bit). C.3.4.5.4 Ground Track Status This one bit (“ME” bit 20) field shall define the validity of the ground track value. Coding for this field shall be as follows: 0=not valid and 1= valid. 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-109 A.4. MODE S BROADC
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Appendix B B-3 TYPE code Subtype co
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Appendix B B-17 Coding (Binary) (De
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Appendix B B-19 a) ACAS operational
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Appendix B B-21 Subfield Coding: DR
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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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Technical Provisions for Mode S Services and Extended Squitter

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