IS-GPS-800A - US Coast Guard Navigation Center

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where, ISC L1CD is provided to the user as subframe 2 data.The values of ISC L1CP and ISC L1CD are measured values that represent the mean SV group delay differential betweenthe L1 P(Y)-code and the L1C P -code or L1C D -code respectively as follows,ISC L1CP = t L1P(Y) - t L1CPISC L1CD = t L1P(Y) - t L1CD ,where t L1x is the GPS time of the L1 frequency x signal (a specific epoch of the signal) transmitted from the SVantenna phase center.3.5.3.9.2 L1/L2 Ionospheric CorrectionThe two frequency (L1C P and L2C) user shall correct for the group delay and ionospheric effects by applying therelationship(PR L2C 12 PR L1CP ) c (ISC L2C PR 12 ISC L1CP ) c T1 GD .12The two frequency (L1C D and L2C) user shall correct for the group delay and ionospheric effects by applying therelationship(PR L2C 12 PR L1CD ) c (ISC L2C PR 12 ISC L1CD ) c T1 GD .12For the preceding equations, the following definitions apply:PR = pseudorange corrected for ionospheric effects,PR i = pseudorange measured on the channel indicated by the subscript,ISC i = inter-signal correction for the channel indicated by the subscript (see paragraph3.5.3.9.1, see paragraph 30.3.3.3.1.1 of IS-GPS-200 for ISC L2C ),T GD = see paragraph 20.3.3.3.3.2 of IS-GPS-200,c = speed of light,and, denoting the nominal center frequencies of L1 and L2 as f L1 and f L2 respectively, 12 = (f L1 /f L2 ) 2 = (1575.42/1227.6) 2 = (77/60) 2 .50 IS-GPS-800A8 June 2010
3.5.3.9.3 L1/L5 Ionospheric CorrectionThe two frequency (L1C P and L5 Q5) user shall correct for the group delay and ionospheric effects by applying therelationship(PRL5Q5 15PRL1CP) c (ISCL5Q5 15ISCL1CP)PR c T1 GD.15The two frequency (L1C D and L5 Q5) user shall correct for the group delay and ionospheric effects by applying therelationship(PRL5Q5 15PRL1CD) c (ISCL5Q5 15ISCL1CD)PR c T1 GD.15The two frequency (L1C P and L5 I5) user shall correct for the group delay and ionospheric effects by applying therelationship(PRL5I5 15PRL1CP) c (ISCL5I5 15ISCL1CP)PR c T .1 GD15The two frequency (L1C D and L5 I5) user shall correct for the group delay and ionospheric effects by applying therelationship(PRL5I5 15PRL1CD) c (ISCL5I5 15ISCL1CD)PR c T .1 GD15For the preceding equations, the following definitions apply:PR = pseudorange corrected for ionospheric effects,PR i = pseudorange measured on the channel indicated by the subscript,ISC i = inter-signal correction for the channel indicated by the subscript (see paragraph 3.5.3.9.1,see paragraph 20.3.3.3.1.2.1 of IS-GPS-705 for ISC L5Q5 and ISC L5I5 ),T GD = see paragraph 20.3.3.3.3.2 of IS-GPS-200,c = speed of light,and, denoting the nominal center frequencies of L1 and L5 as f L1 and f L5 respectively, 15 = (f L1 /f L5 ) 2 = (1575.42/1176.45) 2 = (154/115) 2 .3.5.3.10 Integrity AssuranceThe L1C message will contain information that allows users to operate when integrity is assured. This isaccomplished using an integrity assured URA value in conjunction with an integrity status flag. The URA value isthe RSS of URAoe and URAoc; URA is integrity assured to the enhanced level only when the integrity status flag is“1”.51 IS-GPS-800A8 June 2010
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IS-GPS-800A8 June 2010GLOBAL POSITI
Page 3 and 4:
REVISION RECORDLTR DESCRIPTION DATE
Page 5 and 6:
3.2.3.3 Cyclic Redundancy Check ...
Page 7 and 8: LIST OF FIGURESFigure 3.2-1. Genera
Page 9 and 10: 1. INTRODUCTION1.1 ScopeThis Interf
Page 11 and 12: 3. SIGNAL REQUIREMENTSThe requireme
Page 13 and 14: Carriers of the two L1C components
Page 15 and 16: 3.2.2 PRN Code CharacteristicsThe c
Page 17 and 18: The overlay codes are derived from
Page 19 and 20: 3.2-2 L1C Ranging Codes Parameter A
Page 21 and 22: GPS PRNSignal No.3.2-3 L1C O Overla
Page 23 and 24: FIXED LENGTH-10223 LEGENDRE SEQUENC
Page 25 and 26: 3.2.2.2 Non-Standard CodesThe non-s
Page 27 and 28: corresponding to MSB = 0. (A SV tra
Page 29 and 30: This code has the following charact
Page 31 and 32: 3.2.3.5 InterleavingThe 1748 encode
Page 33 and 34: 3.3 Signal ModulationThe signals mo
Page 35 and 36: Bit valueL1C DbitstreamSubcarrier s
Page 37 and 38: 3.5 Message DefinitionAs shown in F
Page 40 and 41: DIRECTION OF DATA FLOW FROM SV100 B
Page 46 and 47: 3.5.3 Subframe 2Subframe 2 provides
Page 48 and 49: Table 3.5-1. Subframe 2 Parameters
Page 50 and 51: 3.5.3.1 Transmission Week NumberBit
Page 52 and 53: 3.5.3.6 Ephemeris Parameter Charact
Page 54 and 55: Table 3.5-2. Elements of Coordinate
Page 56 and 57: The user shall use the broadcast UR
Page 60 and 61: 3.5.3.10.1 Integrity Status Flag (I
Page 62 and 63: The ionospheric data shall be updat
Page 64 and 65: 3.5.4.2.3 User Algorithm for Applic
Page 66 and 67: transmitted by the SVs will degrade
Page 68 and 69: Table 3.5-7.Midi Almanac Parameters
Page 70 and 71: MSBCDC = Clock Differential Correct
Page 72 and 73: 3.5.4.5 Subframe 3, Page 6 - TextSu
Page 74 and 75: 5. RESERVED66 IS-GPS-800A8 June 201
Page 76 and 77: LSF - Leap Seconds FutureL1C - Comm
Page 78 and 79: Table 6.2-1.Legendre Sequence (Octa
Page 80 and 81: Table 6.2-2 LDPC Submatrix A for Su
Page 90 and 91: Table 6.2-3. LDPC Submatrix B for S
Page 92 and 93: Table 6.2-7. LDPC Submatrix T for s
Page 94 and 95: Table 6.2-7. LDPC Submatrix T for s
Page 96 and 97: Table 6.2-8. LDPC Submatrix A for s
Page 98 and 99: Table 6.2-8. LDPC Submatrix A for s
Page 100 and 101: Table 6.2-9. LDPC Submatrix B for S
Page 102 and 103: Table 6.2-13. LDPC Submatrix T for
Page 104 and 105: Table 6.2-16. Number of 1’s in LD
Page 106 and 107: 6.3 Supporting Material6.3.1 Additi
Page 108 and 109:
Table 6.3-1 Additional L1C Ranging
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Page 114 and 115:
PRNSignalNo.Table 6.3-2. Additional
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PRNSignalNo.Table 6.3-2 Additional
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IS-GPS-800A - US Coast Guard Navigation Center

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