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-48 Technical Provisions for Mode S Services and Extended Squitter b. YZi (the Y-coordinate within the Zone) is then computed from Dlati and lat using separate equations: ( ) For Nb = 17: YZi = floor 2 17 ⋅ MOD lat, Dlat ⎛ i ⎜ ⎝ Dlat i ( ) For Nb = 19: YZi = floor 2 19 ⋅ MOD lat, Dlat ⎛ i ⎜ ⎝ Dlat i ( ) For Nb = 14: YZ0 = floor 2 14 ⋅ MOD lat, Dlat ⎛ 0 ⎜ ⎝ Dlat0 ⎛ 12 MOD( lat, Dlat ) For Nb = 12: i YZ i = floor ⎜ ⎜2 ⎝ ⋅ Dlat + 1⎞ ⎟ 2 ⎟ ⎠ + 1⎞ ⎟ 2 ⎟ ⎠ + 1⎞ ⎟ 2 ⎟ ⎠ 1 ⎞ + ⎟ 2 ⎠ c. Rlati (the latitude that a receiving ADS-B system will extract from the transmitted message) is then computed from lat, YZi, and Dlati using separate equations: For Nb = 17: Rlati = Dlati ⋅ YZ ⎛ ⎛ ⎜ i ⎜ 17 + floor ⎜ ⎝ 2 ⎝ For Nb = 19: Rlati = Dlati ⋅ YZ ⎛ ⎛ ⎜ i ⎜ 19 + floor ⎜ ⎝ 2 ⎝ For Nb = 14: For Nb = 12 Rlat 0 Draft i lat Dlat i lat Dlat i ⎞ ⎞ ⎟ ⎟ ⎟ ⎟ ⎠ ⎠ ⎞ ⎞ ⎟ ⎟ ⎟ ⎟ ⎠ ⎠ ⎛ YZ ⎛ ⎞⎞ ⎜ 0 lat = Dlat ⎟ 0 ⋅ ⎜ + floor ⎜ ⎟ 14 ⎟ ⎝ 2 ⎝ Dlat0 ⎠⎠ ⎛ YZ ⎛ ⎞⎞ ⎜ i lat Rlat ⎟ i = Dlati ⋅ ⎜ + floor ⎜ ⎟ ⎟ ⎝ 2 ⎝ Dlati ⎠⎠ 12 d. Dloni (the longitude zone size in the E-W direction) is then computed from Rlati using the equation: 360° NL( Rlati )−i Dloni = , when NL Rlat ⎧ ⎪ ( i )−i > 0 ⎪ ⎨ ⎪ 360°, when NL( Rlati )−i = 0 ⎩ ⎪ Note.— When performing the NL function, the encoding process must ensure that the NL value is established in accordance with Note 5 of §C.2.6.2.d. 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-49 e. XZi (the X-coordinate within the Zone) is then computed from lon and Dloni using separate equations: ( ) For Nb = 17: XZi = floor 2 17 ⋅ MOD lon, Dlon ⎛ i ⎜ ⎝ Dlon i ( ) For Nb = 19: XZi = floor 2 19 ⋅ MOD lon, Dlon ⎛ i ⎜ ⎝ Dlon i ( ) For Nb = 14: XZ0 = floor 2 14 ⋅ MOD lon, Dlon ⎛ 0 ⎜ ⎝ Dlon0 ⎛ 12 MOD( lon, Dlon ) For Nb = 12: i XZ i = floor ⎜ ⎜2 ⎝ ⋅ Dlon + 1⎞ ⎟ 2⎠ + 1⎞ ⎟ 2⎠ + 1⎞ ⎟ 2⎠ 1 ⎞ + ⎟ 2 ⎠ f. Finally, limit the values of XZi and YZi to fit in the 17-bit, 14-bit or 12-bit field allotted to each coordinate: For Nb = 17: YZi = MOD YZi,2 17 ( ), XZi = MOD XZi,2 17 For Nb = 19: For Nb = 14: For Nb = 12: ( ) YZi = MOD YZi,2 17 ( ), XZi = MOD XZi,2 17 ( ) ( ), YZ0 = MOD YZ0 ,2 14 XZ0 = MOD XZ 0,2 14 ( ) YZi = MOD YZi,2 12 ( ), XZi = MOD XZi,2 12 ( ) Draft C.2.6.4 LOCALLY UNAMBIGUOUS CPR DECODING The CPR algorithm shall decode a geographic position (latitude, Rlati, and longitude, Rloni,) that is locally unambiguous with respect to a reference point (lats, lons) known to be within 180 NM of the true airborne position (or within 45 NM for a surface message). Note.— This reference point may be a previously tracked position that has been confirmed by global decoding (§C.2.6.7) or it may be the own aircraft position, which would be used for decoding a new tentative position report. The encoded position coordinates XZ i and YZ i and the CPR encoding type i (0 for the even encoding and 1 for the odd encoding) contained in a Mode S Extended Squitter message shall be decoded by performing the sequence of computations given in §C.2.6.5 for the airborne and intent format types and in §C.2.6.6 for the surface format type. DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris i
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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 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-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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