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-30 Technical Provisions for Mode S Services and Extended Squitter d) The notation |x| denotes the absolute value of x, which is defined as the value x when x>0 and the value –x when x +87 degrees, NL = 1 For lat < -87 degrees, NL = 1 Draft Note 5.— This equation for NL( ) is impractical for real-time implementation. A table of transition latitudes can be pre-computed using the following equation: ⎛ ⎛ π ⎞ ⎞ ⎜ 1−cos⎜ ⎟ ⎟ 180° ⎜ ⎝2⋅NZ lat = ⋅arccos ⎠ ⎟ for NL = 2 to 4⋅NZ –1 π ⎜ ⎛ 2π ⎞ ⎟ ⎜ 1−cos ⎜ ⎜ ⎟ ⎟ ⎝ ⎠ ⎟ ⎝ NL ⎠ and a table search procedure used to obtain the return value for NL( ). The table value for NL = 1 is 90 degrees. When using the look-up table established by using the equation above, the NL value is not expected to change to the next lower NL value until the boundary (latitude established by the above equation) has actually been crossed when moving from the equator towards the pole. A.2.6.3 CPR ENCODING PROCESS The CPR encoding process shall calculate the encoded position values XZi and YZi for either airborne, surface intent or TIS-B latitude and longitude fields from the global position lat (latitude in degrees), lon (longitude in degrees), and 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-31 CPR encoding type i (0 for even format and 1 for odd format), by performing the following sequence of computations. The CPR encoding for intent shall always use the even format (i = 0), whereas the airborne, surface and TIS-B encoding shall use both even (i = 0) and odd (i = 1) formats. a) Dlati (the latitude zone size in the N-S direction) is computed from the equation: 360° Dlati = 4 ⋅ NZ − i b) YZi (the Y-coordinate within the Zone) is then computed from Dlati and lat using separate equations: For Nb=17 encoding: For Nb=19 encoding: For Nb=14 encoding: For Nb=12 encoding: ( lat Dlat ) ⎛ 17 MOD , i 1 ⎞ YZi = floor ⎜ 2 ⋅ + ⎟ Dlati 2 ⎟ ⎝ ⎠ ( lat Dlat ) ⎛ 19 MOD , i 1 ⎞ YZi = floor ⎜ 2 ⋅ + ⎟ Dlati 2 ⎟ ⎝ ⎠ YZ 0 ( lat Dlat ) ⎛ 14 MOD , 0 1 ⎞ = floor ⎜ 2 ⋅ + ⎟ Dlat 2 ⎟ ⎝ 0 ⎠ ( lat Dlat ) ⎛ 12 MOD , i 1 ⎞ YZi = floor ⎜ 2 ⋅ + ⎟ Dlati 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: ⎛YZ ⎛ i lat ⎞⎞ For Nb=17 encoding: Rlati = Dlati ⋅ ⎜ + floor ⎜ 17 ⎜ ⎟⎟ 2 Dlat ⎟ ⎝ ⎝ i ⎠⎠ ⎛YZ ⎛ i lat ⎞⎞ For Nb=19 encoding: Rlati = Dlati ⋅ ⎜ + floor ⎜ 19 ⎜ ⎟⎟ 2 Dlat ⎟ ⎝ ⎝ i ⎠⎠ Draft ⎛YZ ⎛ 0 lat ⎞⎞ For Nb=14 encoding: Rlat0 = Dlat0⋅ ⎜ + floor ⎜ 14 ⎜ ⎟⎟ 2 Dlat ⎟ ⎝ ⎝ 0 ⎠⎠ ⎛YZ ⎛ i lat ⎞⎞ For Nb=12 encoding Rlati = Dlati ⋅ ⎜ + floor ⎜ 12 ⎜ ⎟⎟ 2 Dlat ⎟ ⎝ ⎝ i ⎠⎠ 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. 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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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-23 CD.2.4.7.5 BINARY
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Technical Provisions for Mode S Services and Extended Squitter

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