Интерфейсный документ GPS, страница 19
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Message Type 32 - Clock & EOPIS-GPS-200D7 Dec 2004145211591PRN6BITS8 BITS6BITSMESSAGETOW COUNT*top17 BITS11 BITS5BITStoca f0-n11 BITS26 BITSa f1-n – 3 MSBsURA oc INDEX"ALERT" FLAG - 1 BITMSB FIRSTDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS101128118a f1-na f2-n17 LSBs10 BITS144157164214WNLSF13 BITS218172188A 0-nA 1-nA 2-n∆tLStotWNot16 BITS13 BITS7 BITS8 BITS16 BITS13 BITSDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS2019872URA oc2 INDEX - 3 BITSURA oc1 INDEX - 3 BITSMESSAGE TYPE IDPREAMBLEMSB FIRSTDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS385055 58 6139MSB FIRST277226DN∆tLSFRESERVEDCRC4BITS8 BITS51 BITS24 BITS* MESSAGE TOW COUNT = 17 MSB OF ACTUAL TOW COUNT AT START OF NEXT 12-SECOND MESSAGEFigure 30-6. Message Type 33 - Clock & UTCIS-GPS-200D7 Dec 2004146121159PRN8 BITS6BITS6BITSMESSAGETOW COUNT*top17 BITS11 BITS5BITS128118a f1-na f2-n17 LSBs10 BITStoca f0-n11 BITS26 BITSa f1-n – 3 MSBsURA oc INDEX"ALERT" FLAG - 1 BIT1019872URA oc2 INDEX - 3 BITSURA oc1 INDEX - 3 BITSMESSAGE TYPE IDPREAMBLEMSB FIRSTDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS385055 58 6139DIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS150151139top-D11 BITSMSB FIRST185tODCDCEDC11 BITS34 BITS16 MSBsDC DATA TYPE – 1 BITDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS277201*MSB FIRSTEDCCRC76 LSBs24 BITSMESSAGE TOW COUNT = 17 MSB OF ACTUAL TOW COUNT AT START OF NEXT 12-SECOND MESSAGECDC = Clock Differential CorrectionEDC = Ephemeris Differential CorrectionFigure 30-7.
Message Type 34 - Clock & Differential CorrectionIS-GPS-200D7 Dec 2004147121159PRN6BITS8 BITS6BITSMESSAGETOW COUNT*top17 BITS11 BITS5BITStoca f0-n11 BITS26 BITSa f1-n – 3 MSBsURA oc INDEX"ALERT" FLAG - 1 BITDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS128118101a f1-na f2-n17 LSBs10 BITS9872URA oc2 INDEX - 3 BITSURA oc1 INDEX - 3 BITSMESSAGE TYPE IDPREAMBLEMSB FIRSTDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS385055 58 6139142155 158MSB FIRST187174t0GGTOWNGGTOA 0GGTO14 BITS13 BITS16 BITSA 1GGTO13 BITS7 BITS 7 BITSRESERVEDGNSS ID – 3 BITSDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS194A 2GGTOMSB FIRST277201RESERVEDCRC76 BITS24 BITS* MESSAGE TOW COUNT = 17 MSB OF ACTUAL TOW COUNT AT START OF NEXT 12-SECOND MESSAGEFigure 30-8.
Message Type 35 - Clock & GGTOIS-GPS-200D7 Dec 2004148121159PRN6BITS8 BITS6BITSMESSAGETOW COUNT*top17 BITS11 BITS5BITStoca f0-n11 BITS26 BITSa f1-n – 3 MSBsURA oc INDEX"ALERT" FLAG - 1 BITMSB FIRSTDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS1019872URA oc2 INDEX - 3 BITSURA oc1 INDEX - 3 BITSMESSAGE TYPE IDPREAMBLEMSB FIRSTDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS385055 58 6139128118a f1-na f2-n17 LSBs10 BITSTEXT MESSAGE (18 8-BIT CHAR)73 MSBsMSB FIRSTDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS272201276277TEXT MESSAGE (18 8-BIT CHAR)CRC4BITS71 LSBsTEXT PAGE24 BITSRESERVED – 1 BIT* MESSAGE TOW COUNT = 17 MSB OF ACTUAL TOW COUNT AT START OF NEXT 12-SECOND MESSAGEFigure 30-9.
Message Type 36 - Clock & TextIS-GPS-200D7 Dec 2004149121159PRN6BITS8 BITS6BITSMESSAGETOW COUNT*top17 BITS11 BITS5BITStoca f0-n11 BITS26 BITSa f1-n – 3 MSBsURA oc INDEX"ALERT" FLAG - 1 BITMSB FIRSTDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS1019872URA oc2 INDEX - 3 BITSURA oc1 INDEX - 3 BITSMESSAGE TYPE IDPREAMBLEMSB FIRSTDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS3855 58 615039128118141a f1-na f2-nWNa-n17 LSBs10 BITS13 BITStoa149155 15818011 BITS11 BITS191•ΩA11 BITS10 MSBsδiePRN a8 BITS 6 BITS169L1 HEALTH – 1 BITL2 HEALTH – 1 BITL5 HEALTH – 1 BITMSB FIRSTDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS201A7 LSBsΩ016 BITS256240224208277267ωM0a f0a f1CRC16 BITS16 BITS11 BITS10 BITS24 BITS* MESSAGE TOW COUNT = 17 MSB OF ACTUAL TOW COUNT AT START OF NEXT 12-SECOND MESSAGEFigure 30-10.
Message Type 37 - Clock & Midi AlmanacIS-GPS-200D7 Dec 20041501159PRN8 BITS6BITS6BITS21MESSAGETOW COUNT*toa8 BITS31 BITSWNa-n13 BITS17 BITS91Reduced AlmanacPacket 110 MSBsReduced Almanac Packet 2MESSAGE TYPE IDPREAMBLEMSB FIRSTDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS38605239"ALERT" FLAG - 1 BITDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS122101Reduced AlmanacPacket 221 LSBs153184Reduced AlmanacPacket 4Reduced AlmanacPacket 3215Reduced AlmanacPacket 531 BITS31 BITSDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS201MSB FIRST17 MSBsMSB FIRST277246Reduced AlmanacPacket 5Reduced AlmanacPacket 6Reduced AlmanacPacket 7CRC14 LSBs31 BITS31 BITS24 BITS* MESSAGE TOW COUNT = 17 MSB OF ACTUAL TOW COUNT AT START OF NEXT 12-SECOND MESSAGEFigure 30-11.
Message Type 12 - Reduced AlmanacIS-GPS-200D7 Dec 2004151121159MESSAGETOW COUNT*PRN8 BITS6BITS6BITStop-D11 BITS17 BITS9697CDCtODMESSAGE TYPE IDPREAMBLEMSB FIRSTDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS613850623911 BITS34 BITSDC DATA TYPE – 1 BITDC DATA TYPE – 1 BITCDC - 4 MSBs"ALERT" FLAG - 1 BITMSB FIRSTDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS166131167132101CDCCDCCDC30 LSBs34 BITS34 BITSDC DATA TYPE – 1 BITDC DATA TYPE – 1 BITDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS236237201202CDCCDC34 BITS34 BITSDC DATA TYPE – 1 BITDC DATA TYPE – 1 BITMSB FIRST2712776BITSCRC24 BITSRESERVED* MESSAGE TOW COUNT = 17 MSB OF ACTUAL TOW COUNT AT START OF NEXT 12-SECOND MESSAGECDC = Clock Differential CorrectionFigure 30-12.
Message Type 13 – Clock Differential CorrectionIS-GPS-200D7 Dec 2004152121159PRN8 BITS6BITSDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS61385062396BITSMESSAGETOW COUNT*17 BITStop-D11 BITSMESSAGE TYPE IDPREAMBLEEDCtOD11 BITSMSB FIRST39 MSBsDC DATA TYPE – 1 BIT"ALERT" FLAG - 1 BITDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS154155101MSB FIRSTEDCEDC53 LSBs46 MSBsDC DATA TYPE – 1 BITDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS247201MSB FIRST277EDCRESERVEDCRC46 LSBs30 BITS24 BITS* MESSAGE TOW COUNT = 17 MSB OF ACTUAL TOW COUNT AT START OF NEXT 12-SECOND MESSAGEEDC = Ephemeris Differential CorrectionFigure 30-13.
Message Type 14 – Ephemeris Differential CorrectionIS-GPS-200D7 Dec 20041531159PRN8 BITS6BITS6BITSMSB FIRSTDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS383921MESSAGETOW COUNT*TEXT MESSAGE (29 8-BIT CHAR)62 MSBs17 BITSMESSAGE TYPE IDPREAMBLE"ALERT" FLAG - 1 BITMSB FIRSTDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS101TEXT MESSAGE (29 8-BIT CHAR)BITS 63-162MSB FIRSTDIRECTION OF DATA FLOW FROM SV100 BITS4 SECONDS271201275277TEXT MESSAGE (29 8-BIT CHAR)CRC4BITS70 LSBsTEXT PAGE24 BITSRESERVED – 2 BITS* MESSAGE TOW COUNT = 17 MSB OF ACTUAL TOW COUNT AT START OF NEXT 12-SECOND MESSAGEFigure 30-14. Message Type 15 - TextIS-GPS-200D7 Dec 200415430.3.3.1 Message Type 10 and 11 Ephemeris and Health Parameters.30.3.3.1.1 Message Type 10 and 11 Ephemeris and Health Parameter Content.
The contents of the SV health,ephemeris representation and accuracy parameters in message types 10 and 11 are defined below, followed bymaterial pertinent to the use of the data. Message type 10 in conjunction with message type 11, provide users withthe requisite data to calculate SV position. The general format of message types 10 and 11 consist of data fields forreference time tags, a set of gravitational harmonic correction terms, rates and rate corrections to quasi-Keplerianelements, and an accuracy indicator for ephemeris-related data.The ephemeris parameters in the message type 10 and type 11 describe the orbit of the transmitting SV during thecurve fit interval of three hours.
The nominal transmission interval is two hours, and shall coincide with the firsttwo hours of the curve fit interval. The period of applicability for ephemeris data coincides with the entire threehour curve fit interval. Table 30-I gives the definition of the orbital parameters using terminology typical ofKeplerian orbital parameters; it is noted, however, that the transmitted parameter values are expressed such thatthey provide the best trajectory fit in Earth-Centered, Earth-Fixed (ECEF) coordinates for each specific fit interval.The user shall not interpret intermediate coordinate values as pertaining to any conventional coordinate system.Any change in the Message Type 10 and 11 ephemeris data will be accomplished with a simultaneous change in thetoe value.
