European GNSS (Galileo) open service (797926), страница 10
Текст из файла (страница 10)
i-iiOS SIS ICD, Issue 1.2, dd.mm 2014ResE5b-I ContentWord 6(2/2)Res CRC Res25NOdd26NEvenSpare Word (1/2)27NOddSpareRes CRC ResWord (2/2)28NEvenSpare Word (1/2)29NOddSpareRes CRC ResWord (2/2)30N+1EvenWord 1 (1/2)Word 5(2/2)E1-B ContentE1-BPageE1BSubframeIDWord 5 (1/2)EvenNOddNEvenNOddNEvenNOddNRes SAR Spare CRCResSpare Word (1/2)SpareRes SAR Spare CRCWord (2/2)RestionT0E5b E5b-I(GST0 Sub Pagesync.) frame(s)IDSpare Word (1/2)SpareRes SAR Spare CRCWord (2/2)ResltaAFCoTnTable 37. I/Nav Nominal Sub-Frame Structure* The dissemination sequence of Word Types 7, 8, 9 and 10 within a frame is detailed in Table 38.4.3.4.
I/NAV Nominal Frame LayoutSubT0 (s) frameIDDRE5bsuThe I/NAV sub-frames containing almanac data are sequenced in a nominal frameaccording to Table 38.30123904Word 7: Almanac SV 19 (1/2)Word 8: Almanac SV 19 (2/2) + almanacSV 20 (1/2)Word 9: Almanac SV 20 (2/2) + almanacSV 21 (1/2)Word 10: Almanac SV 21 (2/2)Word 7: Almanac SV 22 (1/2)Word 8: Almanac SV 22 (2/2) + almanacSV 23 (1/2)Word 9: Almanac SV 5 (2/2) + almanacSV 6 (1/2)Word 9: Almanac SV 23 (2/2) + almanacSV 24 (1/2)Word 10: Almanac SV 6 (2/2)Word 7: Almanac SV 7 (1/2)Word 8: Almanac SV 7 (2/2) + almanacSV 8 (1/2)Word 9: Almanac SV 8 (2/2) + almanacSV 9 (1/2)Word 10: Almanac SV 9 (2/2)Word 7: Almanac SV 10 (1/2)Word 8: Almanac SV 10 (2/2) + almanacSV 11 (1/2)Word 9: Almanac SV 11 (2/2) + almanacSV 12 (1/2)Word 10: Almanac SV 12 (2/2)Word 7: Almanac SV 13 (1/2)Word 8: Almanac SV 13 (2/2) + almanacSV 14 (1/2)Word 10: Almanac SV 24 (2/2)Word 7: Almanac SV 25 (1/2)Word 8: Almanac SV 25 (2/2) + almanacSV 26 (1/2)Word 9: Almanac SV 26 (2/2) + almanacSV 27 (1/2)Word 10: Almanac SV 27 (2/2)Word 7: Almanac SV 28 (1/2)Word 8: Almanac SV 28 (2/2) + almanacSV 29 (1/2)Word 9: Almanac SV 29 (2/2) + almanacSV 30 (1/2)Word 10: Almanac SV 30 (2/2)Word 7: Almanac SV 31 (1/2)Word 8: Almanac SV 31 (2/2) + almanacSV 32 (1/2)rPub60Word 7: Almanac SV 1 (1/2)Word 8: Almanac SV 1 (2/2) + almanacSV 2 (1/2)Word 9: Almanac SV 2 (2/2) + almanacSV 3 (1/2)Word 10: Almanac SV 3 (2/2)Word 7: Almanac SV 4 (1/2)Word 8: Almanac SV 4 (2/2) + almanacSV 5 (1/2)lic051506Fo120180721082409E1B© European Union 2014Document subject to terms of use and disclaimers p.
i-iiOS SIS ICD, Issue 1.2, dd.mm 201433SubT0 (s) frameID30011330123601339014420154501648017Word 9: Almanac SV 14 (2/2) + almanacSV 15 (1/2)Word 10: Almanac SV 15 (2/2)Word 7: Almanac SV 16 (1/2)Word 8: Almanac SV 16 (2/2) + almanacSV 17 (1/2)Word 9: Almanac SV 17 (2/2) + almanacSV 18 (1/2)Word 10: Almanac SV 18 (2/2)Word 7: Almanac SV 19 (1/2)Word 8: Almanac SV 19 (2/2) + almanacSV 20 (1/2)Word 9: Almanac SV 20 (2/2) + almanacSV 21 (1/2)Word 10: Almanac SV 21 (2/2)Word 7: Almanac SV 22 (1/2)Word 8: Almanac SV 22 (2/2) + almanacSV 23 (1/2)Word 9: Almanac SV 23 (2/2) + almanacSV 24 (1/2)Word 10: Almanac SV 24 (2/2)Word 7: Almanac SV 25 (1/2)Word 8: Almanac SV 25 (2/2) + almanacSV 26 (1/2)Word 9: Almanac SV 26 (2/2) + almanacSV 27 (1/2)Word 10: Almanac SV 27 (2/2)Word 7: Almanac SV 28 (1/2)Word 8: Almanac SV 28 (2/2) + almanacSV 29 (1/2)Word 9: Almanac SV 29 (2/2) + almanacSV 30 (1/2)Word 10: Almanac SV 30 (2/2)Word 9: Almanac SV 32 (2/2) + almanacSV 33 (1/2)Word 10: Almanac SV 33 (2/2)Word 7: Almanac SV 34 (1/2)Word 8: Almanac SV 34 (2/2) + almanacSV 35 (1/2)Word 9: Almanac SV 35 (2/2) + almanacSV 36 (1/2)Word 10: Almanac SV 36 (2/2)Word 7: Almanac SV 1 (1/2)Word 8: Almanac SV 1 (2/2) + almanacSV 2 (1/2)Word 9: Almanac SV 2 (2/2) + almanacSV 3 (1/2)Word 10: Almanac SV 3 (2/2)Word 7: Almanac SV 4 (1/2)Word 8: Almanac SV 4 (2/2) + almanacSV 5 (1/2)Word 9: Almanac SV 5 (2/2) + almanacSV 6 (1/2)Word 10: Almanac SV 6 (2/2)Word 7: Almanac SV 7 (1/2)Word 8: Almanac SV 7 (2/2) + almanacSV 8 (1/2)Word 9: Almanac SV 8 (2/2) + almanacSV 9 (1/2)Word 10: Almanac SV 9 (2/2)Word 7: Almanac SV 10 (1/2)Word 8: Almanac SV 10 (2/2) + almanacSV 11 (1/2)Word 9: Almanac SV 11 (2/2) + almanacSV 12 (1/2)Word 10: Almanac SV 12 (2/2)540195702021ltasuWord 7: Almanac SV 31 (1/2)Word 7: Almanac SV 13 (1/2)Word 8: Almanac SV 31 (2/2) + almanacSV 32 (1/2)Word 9: Almanac SV 32 (2/2) + almanacSV 33 (1/2)Word 10: Almanac SV 33 (2/2)Word 7: Almanac SV 34 (1/2)Word 8: Almanac SV 34 (2/2) + almanacSV 35 (1/2)Word 9: Almanac SV 35 (2/2) + almanacSV 36 (1/2)Word 10: Almanac SV 36 (2/2)Word 8: Almanac SV 13 (2/2) + almanacSV 14 (1/2)Word 9: Almanac SV 14 (2/2) + almanacSV 15 (1/2)Word 10: Almanac SV 15 (2/2)Word 7: Almanac SV 16 (1/2)Word 8: Almanac SV 16 (2/2) + almanacSV 17 (1/2)Word 9: Almanac SV 17 (2/2) + almanacSV 18 (1/2)Word 10: Almanac SV 18 (2/2)rP600ub18licDR5102266023Fo63069024tion10E1BAFCoTn270E5bTable 38.
I/NAV Sub-Frame Sequencing4.3.5. I/NAV Word TypesThe content of the I/NAV word types is stated in the following tables (see Chapter 5 for adescription of the I/NAV word types contents).34© European Union 2014Document subject to terms of use and disclaimers p. i-iiOS SIS ICD, Issue 1.2, dd.mm 2014Word Type 1: Ephemeris (1/4)Type=1IODnavt0eM0eA1/2ReservedEphemeris (1/4)Total(bits)610143232322128Table 39. Bits Allocation for I/NAV Word Type 1iωi0323232lta10●lic AFCoTnIODnav6Ω0Type=2Ephemeris (2/4)14ReservedtionWord Type 2: Ephemeris (2/4)Total(bits)2128suWord Type 3: Ephemeris (3/4) and SISA241616CRS10CRC6CUSCUCΩ∆n●DRIODnavType=3Ephemeris (3/4)161616SISA(E1,E5b)Table 40.
Bits Allocation for I/NAV Word Type 2Total(bits)8128Table 41. Bits Allocation for I/NAV Word Type 3Word Type 4: SVID, Ephemeris (4/4), and Clock correction parametersCist0caf0af1af2Spare161614312162128ubCic10SVIDIODnav6Clock correctionTotal(bits)6rPType=4Ephemeris (4/4)Table 42. Bits Allocation for I/NAV Word Type 4Word Type 5: Ionospheric correction, BGD, signal health and data validity status and GST10 1011Spare2Total(bits)TOW2WN1E1BDVS1E5bDVSRegion 51E1BHSRegion 41GSTE5bHSRegion 31BGD(E1,E5b)Region 211 11 14Region 1ai2ai1ai0Type=56Ionosphericdisturbance flagAzBGD(E1,E5a)FoIonospheric correction12 20 23128Table 43.
Bits Allocation for I/NAV Word Type 5© European Union 2014Document subject to terms of use and disclaimers p. i-iiOS SIS ICD, Issue 1.2, ?????????? 201435Word Type 6: GST-UTC conversion parametersA1∆tLStotWN0tWNLSFDN∆tLSF3224888838SpareA06TOWType=6GST-UTC conversion parametersTotal(bits)203128tionTable 44. Bits Allocation for I/NAV Word Type 6ωδiΩ01311161116Reservede611166128●Spare∆(A1/2)10M0SVID12Total(bits)Ωt0a4Total(bits)111128●ltaAFCoTnWNa6IODaType=7SVSVID1 (1/2)ΩWord Type 7: Almanac for SVID1 (1/2), almanac reference time and almanac referenceweek numbersuTable 45.
Bits Allocation for I/NAV Word Type 7Word Type 8: Almanac for SVID1 (2/2) and SVID2 (1/2))IODaSVSVID2(1/2)E5bHSE1BHSSVID2∆(A1/2)eωδiΩ04af16af0DRType=8SVSVID1(2/2)16132261311161116licTable 46. Bits Allocation for I/NAV Word Type 8Word Type 9: Almanac for SVID2 (2/2) and SVID3 (1/2))E1BHSSVID3∆(A1/2)eωδi10E5bHS2af14af06SVSVID3(1/2)M0t0aubWNaIODarPType=9SVSVID2(2/2)Total(bits)16161322613111611128Table 47.
Bits Allocation for I/NAV Word Type 9af0af1E5bHSE1BHSA0GA1Gt0GWN0G16M04ΩIODa6GST-GPS conversionparametersSVSVID3(2/2)Ω0Type=10FoWord type 10: Almanac for SVID3 (2/2) and GST-GPS conversion parameters1116161322161286●Table 48. Bits Allocation for I/NAV Word Type 1036© European Union 2014Document subject to terms of use and disclaimers p. i-iiOS SIS ICD, Issue 1.2, ?????????? 2014Total(bits)128Word Type 0: I/NAV Spare Word6288TOWTimeSpareWNType=0GST1220Total(bits)128Table 49. Bits Allocation for Spare WordtionWhen the field ‘Time’ is not set to ‘10’, the fields WN and TOW do not contain valid data.4.3.6. I/NAV Dummy Message LayoutltaAFCoTnIn case no valid I/NAV data is to be transmitted, the satellite generates and downlinksthe dummy message on E5b-I and E1-B components replacing the pages in the nominalsequencing, according to the Dummy pages layout defined in Table 50.6120CRCSpareTailTotal (bits)12080Dummy data (1/2)Total (bits)Spare861Tail2481111126120suTotal (bits)80licPage Type1CRCEven/odd=11Dummydata(2/2)24Page Type120Dummydata(2/2)Page Type6Even/odd=1Total (bits)112E1-BEven/odd=0Tail1TailPage Type1Dummy data (1/2)DREven/odd=0E5b-ITable 50.
I/NAV Dummy Page with Bits AllocationubThe parameters for the dummy page have the following meaning and related values:Even/Odd (1 bit) to indicate the part of the page (0=even/1=odd) that is broadcast●●Page Type (1 bit) equal to 0 to indicate the nominal page type●●Dummy Data (192 bits = 80 bits + 112 bits)●●CRC (24 bits): computed on the Even/odd fields, Type fields and Dummy data fields(1/2 and 2/2) for the Even/Odd page of the same frequency (“vertical CRC”), andthe CRC is always broadcast on the second part of the “vertical page”ForP●●●●Spare (8 bits).
This field is not protected by the CRC●●Tail bits (2*6 bits) as defined in 4.3.2.2. These fields are not protected by the CRCThe dummy data word is formatted according to Table 51, with●●Word Type (6 bits) to indicate the word type dummy message, which is definedas type 63●●The dummy sequence (186 bits) is an arbitrary sequence© European Union 2014Document subject to terms of use and disclaimers p. i-iiOS SIS ICD, Issue 1.2, ?????????? 201437Type = 63Dummy Sequence6186Total(bits)192Dummy Data (1/2)(112 bits)Dummy Data (2/2)(80 bits)tionTable 51. Dummy Word with Bits Allocation4.3.7.
SAR Field StructureIn the nominal mode the SAR RLM is transmitted only in the E1-B component. The SAR fieldstructure for the E1-B component in nominal mode is formatted according to the valuesstated in Table 52. When an alert is present, the SAR data will not be transmittedAFCoTnSAR Data11TotalltaStart BitShort/Long RLMIdentifierSAR RLM Data(bits)2022suTable 52.
SAR Field Bit StructureThe RLM identifier bit is described in the following table.DRRLM Identifier ValueDescription0Short RLM1Long RLMlicTable 53. RLM Identifier DescriptionSAR data in Nominal ModeubIn nominal mode, 22 bits are allocated to SAR data in one E1-B I/NAV page. The SARmessages are formatted according to the values and structure stated in Table 54 andTable 55 respectively for the short RLM and the long RLM. This structure allows the downlinkof a short RLM within 8 seconds and of a long RLM within 16 seconds.
![](https://s.studizba.com/z.php?f=/templates/si/i/noavatar.png&w=100&h=100&t=1"){kind=avatar}
