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 A-32 Technical Provisions for Mode S Services and Extended Squitter e) XZi (the X-coordinate within the Zone) is then computed from lon and Dloni using separate equations: For Nb=17 encoding: For Nb=19 encoding: For Nb=14 encoding: For Nb=12 encoding: ( lon Dlon ) ⎛ 17 MOD , i 1 ⎞ XZi = floor ⎜ 2 ⋅ + ⎟ Dloni 2 ⎟ ⎝ ⎠ ( lon Dlon ) ⎛ 19 MOD , i 1 ⎞ XZi = floor ⎜ 2 ⋅ + ⎟ Dloni 2 ⎟ ⎝ ⎠ XZ 0 ( lon Dlon ) ⎛ 14 MOD , 0 1 ⎞ = floor ⎜ 2 ⋅ + ⎟ Dlon 2 ⎟ ⎝ 0 ⎠ ( lon Dlon ) ⎛ 12 MOD , i 1 ⎞ XZi = floor ⎜ 2 ⋅ + ⎟ Dloni 2 ⎟ ⎝ ⎠ f) Finally, limit the values of XZi and YZi to fit in the 17-bit or 14-bit field allotted to each coordinate: For Nb=17 encoding: For Nb=19 encoding: 17 ( ) 17 ( ) YZ = MOD YZ ,2 , i i XZ = MOD XZ ,2 i i 17 ( ) 17 ( ) YZ = MOD YZ ,2 , i i XZ = MOD XZ ,2 i i For Nb=14 encoding: 14 YZ0 = MOD ( YZ0,2) , 14 XZ0 = MOD ( XZ0,2) For Nb=12 encoding: 12 YZi = MOD ( YZi,2) , 12 XZi = MOD ( XZi,2) Draft A.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 (see §A.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 XZi and YZi 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 §A.2.6.5 for the airborne intent and TIS-B format types and in §A.2.6.6 for the surface format type. A.2.6.5 LOCALLY UNAMBIGUOUS AIRBORNE POSITION DECODING The following computations shall be performed to obtain the locally ambiguous decoded latitude/longitude for the airborne intent and TIS-B message formats. For the intent format, i will always be set to 0 (even encoding), whereas the 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 A A-33 airborne format shall use both even (i = 0) and odd (i = 1) encoding. For the airborne and fine TIS-B formats, Nb shall equal 17, for the intent format, Nb shall equal 14 and for the coarse TIS-B format, Nb shall equal 12. a) Dlati is computed from the equation: 360° Dlati = 4 ⋅ NZ − i b) The latitude zone index number, j, is then computed from the values of lats, Dlati and YZi using the equation: ( lat Dlat ) ⎛ lat ⎞ ⎛1MOD s, s i YZ ⎞ i j = floor ⎜ ⎟+ floor ⎜ Nb Dlat ⎜ + − ⎟ i 2 Dlati 2 ⎟ ⎝ ⎠ ⎝ ⎠ c) The decoded position latitude, Rlati, is then computed from the values of j, Dlati, and YZi using the equation: ⎛ YZi ⎞ Rlati = Dlati ⋅ ⎜ j + Nb ⎟ ⎝ 2 ⎠ d) Dloni (the longitude zone size in the E-W direction) is then computed from Rlati using the equation: ⎧ 360° ⎪ , when NL ( Rlati ) − i > 0 ⎪NL ( Rlati ) − i Dloni = ⎨ ⎪ 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 §A.2.6.2.f. e) The longitude zone coordinate m is then computed from the values of lons, Dloni, and XZi using the equation: ( lon Dlon ) ⎛ lon ⎞ ⎛1MOD s, s i XZ ⎞ i m = floor ⎜ ⎟+ floor ⎜ Nb Dlon ⎜ + − ⎟ i 2 Dloni 2 ⎟ ⎝ ⎠ ⎝ ⎠ Draft f) The decoded position longitude, Rloni, is then computed from the values of m, XZi, and Dloni using the equation: ⎛ XZi ⎞ Rloni = Dloni ⋅ ⎜m+ Nb ⎟ ⎝ 2 ⎠ A.2.6.6 LOCALLY UNAMBIGUOUS SURFACE POSITION DECODING The following computations shall be performed to obtain the decoded latitude and longitude for the surface position format. a) Dlati is computed from the equation: 90° Dlati = 4 ⋅ NZ − i b) The latitude zone index, j, is then computed from the values of lats, Dlati and YZi using the equation: ( lat Dlat ) ⎛ lat ⎞ ⎛1MOD , s s i YZ ⎞ i j = floor ⎜ ⎟+ floor ⎜ 17 Dlat ⎜ + − ⎟ i 2 Dlati 2 ⎟ ⎝ ⎠ ⎝ ⎠ DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
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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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Msg Bit # “ME” Bit # Appendix C
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Appendix C C-57 B Reports to have k
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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-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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