Galileo OS SIS ICD (797928), страница 2
Текст из файла (страница 2)
247.1.1.2 Modulation Type............................................................................................... 257.1.2 E6 Signal.................................................................................................................. 287.1.2.1 Modulation Scheme .......................................................................................... 287.1.2.2 Modulation Type............................................................................................... 307.1.3 E1 Signal..................................................................................................................
307.1.3.1 Modulation Scheme .......................................................................................... 307.1.3.2 Modulation Type............................................................................................... 317.2Logic Levels .................................................................................................................. 317.3Transmitted Signal Phase noise .................................................................................. 327.4Transmitted signal code/data coherency....................................................................
327.5Payload and component reception losses ................................................................... 32©, 2006, European Space Agency / Galileo Joint UndertakingDocument subject to terms of use and disclaimers p. 2-4.Reference:Issue:Revision:Date:GAL OS SIS ICD/D.0Draft023/05/2006Page78.GALILEO SPREADING CODES CHARACTERISTICS..................................
338.1Code Lengths ................................................................................................................ 338.2 Spreading codes generation......................................................................................... 338.2.1 Spreading codes generation for long codes ............................................................. 338.2.2 Generation of truncated and combined M-sequences for primary codes ................ 348.3 Primary Codes ..............................................................................................................
378.3.1 E5 Primary Codes.................................................................................................... 378.3.1.1 Base register 2 start value for E5a-I.................................................................. 388.3.1.2 Base register 2 start value for E5a-Q ................................................................
398.3.1.3 Base register 2 start value for E5b-I ................................................................. 408.3.1.4 Base register 2 start value for E5b-Q................................................................ 418.3.2 E1-B and E1-C Primary Codes................................................................................ 418.4 Secondary Codes .......................................................................................................... 428.4.1 Definition of secondary codes ................................................................................. 428.4.2 Secondary codes assignment ................................................................................... 448.5Code Assignments to Satellites....................................................................................
459.GALILEO MESSAGE STRUCTURE............................................................... 469.1 general Message Format Specification....................................................................... 469.1.1 General Navigation Message Content ..................................................................... 469.1.2 General Navigation Message structure.................................................................... 469.1.2.1 Message Data Frames ....................................................................................... 469.1.2.2 Page Structure ...................................................................................................
469.1.3 Bit and byte ordering criteria................................................................................... 479.1.4 FEC Coding and Interleaving Parameters ............................................................... 479.1.4.1 FEC encoding and Viterbi decoding................................................................. 479.1.4.2 Interleaving .......................................................................................................
489.1.5 Page processing sequence at reception.................................................................... 489.1.6 Frame Timing .......................................................................................................... 499.2 F/NAV message description......................................................................................... 499.2.1 General description of the F/NAV message ............................................................ 499.2.2 F/NAV Page Layout ................................................................................................
499.2.2.1 Tail bits ............................................................................................................. 509.2.2.2 F/NAV Word .................................................................................................... 509.2.3 F/NAV Frame Layout.............................................................................................. 509.2.4 F/NAV Page Contents ............................................................................................. 549.2.4.1 F/NAV E5a page type 1.................................................................................... 549.2.4.2 F/NAV E5a page type 2 and 3 ..........................................................................
549.2.4.3 F/NAV E5a page type 4.................................................................................... 55©, 2006, European Space Agency / Galileo Joint UndertakingDocument subject to terms of use and disclaimers p. 2-4.9.2.4.4Reference:Issue:Revision:Date:GAL OS SIS ICD/D.0Draft023/05/2006Page8F/NAV E5a-I Page Type 5 and 6...................................................................... 559.3 I/NAV message description .........................................................................................
569.3.1 General description of the I/NAV message............................................................. 569.3.1.1 General Page Layout......................................................................................... 569.3.1.2 Nominal Sub-Frame Layout ............................................................................. 589.3.1.3 Nominal Frame Layout ..................................................................................... 589.3.1.4 Page Contents.................................................................................................... 6010.MESSAGE DATA CONTENTS .......................................................................
6510.1Navigation Data......................................................................................................... 6510.1.1Ephemeris............................................................................................................. 6510.1.2Time Correction and Clock Correction Parameters ............................................. 6710.1.2.1 Satellite time correction data ............................................................................ 6710.1.2.2 Galileo System Time (GST) .............................................................................
6810.1.2.3 Clock Correction............................................................................................... 6810.1.2.4 Broadcast Group Delay .................................................................................... 6910.1.2.5 Ionospheric correction ...................................................................................... 7110.1.2.6 UTC Conversion............................................................................................... 7210.1.2.7 GPS to Galileo System Time............................................................................ 7410.1.3Service parameters ...............................................................................................
7410.1.3.1 Satellite ID........................................................................................................ 7410.1.3.2 Issue Of Data and Reference Time................................................................... 7410.1.3.3 Navigation Data Validity and Signal Health Status in F/NAV ........................ 7510.1.3.4 Checksum ......................................................................................................... 7610.1.4Almanac ............................................................................................................... 7711.ANNEX 1 – RANDOMLY GENERATED CODESP ........................................... 79270H11.1Hexadecimal coding Convention .............................................................................
![](https://s.studizba.com/z.php?f=/templates/si/i/noavatar.png&w=100&h=100&t=1"){kind=avatar}
