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

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3.5.4.2.3 User Algorithm for Application of the EOP.................................................................... 563.5.4.3 Subframe 3, Page 3 & Page 4 – Almanac ................................................................................. 573.5.4.3.1 Almanac Reference Week ............................................................................................... 573.5.4.3.2 Almanac Reference Time ................................................................................................ 573.5.4.3.3 SV PRN Number ............................................................................................................. 573.5.4.3.4 Signal Health (L1/L2/L5)................................................................................................ 573.5.4.3.5 Reduced Almanac Data ................................................................................................... 573.5.4.3.5.1 Reduced Almanac Packet ...................................................................................... 583.5.4.3.6 Midi Almanac Parameter Content ................................................................................... 593.5.4.4 Subframe 3, Page 5 – Differential Correction ........................................................................... 603.5.4.4.1 Differential Correction Parameter Content ..................................................................... 603.5.4.4.2 Differential Correction Data Predict Time of Week ....................................................... 613.5.4.4.3 Time of Differential Correction Data .............................................................................. 613.5.4.4.4 DC Data Packet ............................................................................................................... 613.5.4.4.4.1 SV PRN Identification .......................................................................................... 613.5.4.4.4.2 Application of DC Data ........................................................................................ 613.5.4.5 Subframe 3, Page 6 – Text ........................................................................................................ 643.5.4.6 Subframe 3, Page 7 – (Reserved) .............................................................................................. 643.5.5 Timing Relationships .......................................................................................................................... 643.5.5.1 Paging and Cutovers .................................................................................................................. 644. NOT APPLICABLE ............................................................................................................................................. 655. RESERVED ........................................................................................................................................................... 666. NOTES ................................................................................................................................................................... 676.1 Acronyms ...................................................................................................................................................... 676.2 Definitions ..................................................................................................................................................... 686.2.1 User Range Accuracy .......................................................................................................................... 686.2.1.1 Integrity Assured URA .............................................................................................................. 696.2.1.2 User Differential Range Accuracy ............................................................................................ 696.2.2 GPS Week Number ............................................................................................................................. 696.2.3 Legendre Sequence .............................................................................................................................. 696.2.4 LDPC Submatrices .............................................................................................................................. 696.3 Supporting Material ....................................................................................................................................... 986.3.1 Additional PRN Sequences ................................................................................................................. 986.3.1.1 Additional L1C Ranging Code Sequences ................................................................................ 986.3.1.2 Additional L1C Overlay Code Sequences ............................................................................... 1056.3.2 Pre-Operational Use .......................................................................................................................... 113viIS-GPS-800A8 June 2010
LIST OF FIGURESFigure 3.2-1. Generation of L1C P -/L1C D -Codes .................................................................................................. 15Figure 3.2-2. L1C O -Code Generator Configuration .............................................................................................. 16Figure 3.2-3. L1C Message Structure ................................................................................................................... 18Figure 3.2-4. BCH (51, 8) Code Generator .......................................................................................................... 19Figure 3.2-5. Parity Check Matrix H for LDPC Code .......................................................................................... 22Figure 3.2-6. Conceptual Block Interleaver .......................................................................................................... 24Figure 3.3-1. L1CP-/L1CD-/L1CO-Code Timing Relationships ......................................................................... 26Figure 3.3-2. Subcarrier Polarity Mapping ........................................................................................................... 27Figure 3.5-1. Subframe 2 – Clock, Ephemeris, ITOW ......................................................................................... 30Figure 3.5-2. Subframe 3, Page 1 – UTC & IONO .............................................................................................. 31Figure 3.5-3. Subframe 3, Page 2 – GGTO & EOP .............................................................................................. 32Figure 3.5-4. Subframe 3, Page 3 – Reduced Almanac ........................................................................................ 33Figure 3.5-5. Subframe 3, Page 4 – Midi Almanac .............................................................................................. 34Figure 3.5-6. Subframe 3, Page 5 – Differential Correction ................................................................................. 35Figure 3.5-7. Subframe 3, Page 6 – Text .............................................................................................................. 36Figure 3.5-8. Subframe 3, Page 7 – (Reserved).................................................................................................... 37Figure 3.5-9. Reduced Almanac Packet Content .................................................................................................. 58Figure 3.5-10. Differential Correction Data Packet ................................................................................................ 62viiIS-GPS-800A8 June 2010
Page 1 and 2: IS-GPS-800A8 June 2010GLOBAL POSITI
Page 3 and 4: REVISION RECORDLTR DESCRIPTION DATE
Page 5: 3.2.3.3 Cyclic Redundancy Check ...
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 58 and 59:
where, ISC L1CD is provided to the
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3.5.3.10.1 Integrity Status Flag (I
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The ionospheric data shall be updat
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3.5.4.2.3 User Algorithm for Applic
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transmitted by the SVs will degrade
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Table 3.5-7.Midi Almanac Parameters
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MSBCDC = Clock Differential Correct
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3.5.4.5 Subframe 3, Page 6 - TextSu
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5. RESERVED66 IS-GPS-800A8 June 201
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LSF - Leap Seconds FutureL1C - Comm
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Table 6.2-1.Legendre Sequence (Octa
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Table 6.2-2 LDPC Submatrix A for Su
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Table 6.2-3. LDPC Submatrix B for S
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Table 6.2-7. LDPC Submatrix T for s
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Table 6.2-7. LDPC Submatrix T for s
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Table 6.2-8. LDPC Submatrix A for s
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Table 6.2-8. LDPC Submatrix A for s
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Table 6.2-9. LDPC Submatrix B for S
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Table 6.2-13. LDPC Submatrix T for
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Table 6.2-16. Number of 1’s in LD
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6.3 Supporting Material6.3.1 Additi
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Table 6.3-1 Additional L1C Ranging
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Page 112 and 113:
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PRNSignalNo.Table 6.3-2. Additional
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PRNSignalNo.Table 6.3-2 Additional
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