IS-GPS-800A - US Coast Guard Navigation Center
IS-GPS-800A - US Coast Guard Navigation Center IS-GPS-800A - US Coast Guard Navigation Center
TABLE OF CONTENTS1. INTRODUCTION .................................................................................................................................................. 11.1 Scope ............................................................................................................................................................... 11.2 Interface Definition ......................................................................................................................................... 11.3 IS Approval and Changes ................................................................................................................................ 12. APPLICABLE DOCUMENTS .............................................................................................................................. 22.1 Applicable Documents .................................................................................................................................... 22.2 Reference Documents ...................................................................................................................................... 23. SIGNAL REQUIREMENTS ................................................................................................................................. 33.1 Signal Structure ............................................................................................................................................... 33.2 Signal Definition ............................................................................................................................................. 33.2.1 Signal Characteristics ............................................................................................................................ 33.2.1.1 Frequency Plan ............................................................................................................................ 33.2.1.2 Signal Polarization ...................................................................................................................... 43.2.1.3 Carrier Phase Noise (TBR).......................................................................................................... 43.2.1.4 Spurious Transmissions ............................................................................................................... 43.2.1.5 Correlation Loss .......................................................................................................................... 43.2.1.6 Signal Component Phasing ......................................................................................................... 43.2.1.6.1 Phase Relationship ............................................................................................................ 43.2.1.6.2 Phase Continuity ............................................................................................................... 53.2.1.7 Signal Characteristics .................................................................................................................. 53.2.1.7.1 Signal Coherence .............................................................................................................. 53.2.1.7.2 Signal Distortion ............................................................................................................... 53.2.1.8 Equipment Group Delay .............................................................................................................. 53.2.1.8.1 Group Delay Uncertainty .................................................................................................. 53.2.1.8.2 Group Delay Differential .................................................................................................. 63.2.1.8.3 Space Service Volume (SSV) Group Delay Differential .................................................. 63.2.1.9 Signal Power Levels .................................................................................................................... 63.2.2 PRN Code Characteristics ..................................................................................................................... 73.2.2.1 L1C Codes ................................................................................................................................... 73.2.2.1.1 Ranging Code Structure .................................................................................................... 73.2.2.1.2 Overlay Code Structure ..................................................................................................... 83.2.2.2 Non-Standard Codes ................................................................................................................. 173.2.3 Message Characteristics ...................................................................................................................... 173.2.3.1 L1C Message Structure ............................................................................................................. 173.2.3.2 Time of Interval Data Encoding ................................................................................................ 18ivIS-GPS-800A8 June 2010
3.2.3.3 Cyclic Redundancy Check ........................................................................................................ 203.2.3.4 Low Density Parity Check (LDPC) Code ................................................................................. 213.2.3.5 Interleaving ............................................................................................................................... 233.3 Signal Modulation ......................................................................................................................................... 253.4 Interface Criteria ............................................................................................................................................ 283.4.1 GPS Time ............................................................................................................................................ 283.4.2 SV Time vs. GPS Time ....................................................................................................................... 283.4.3 Speed of Light ..................................................................................................................................... 283.5 Message Definition ........................................................................................................................................ 293.5.1 Message Content ................................................................................................................................. 293.5.2 Subframe 1 .......................................................................................................................................... 293.5.3 Subframe 2 .......................................................................................................................................... 383.5.3.1 Transmission Week Number ..................................................................................................... 423.5.3.2 ITOW ........................................................................................................................................ 423.5.3.3 Data Predict Time of Week ....................................................................................................... 423.5.3.4 L1C Signal Health ..................................................................................................................... 423.5.3.5 SV Accuracy ............................................................................................................................. 423.5.3.6 Ephemeris Parameter Characteristics ........................................................................................ 443.5.3.6.1 User Algorithm for Determination of SV Position .......................................................... 443.5.3.7 Clock Parameter Characteristics ............................................................................................... 463.5.3.7.1 User Algorithms for SV Clock Correction Data ............................................................. 463.5.3.8 SV Clock Accuracy Estimates .................................................................................................. 473.5.3.9 Group Delay Correction Parameters ......................................................................................... 493.5.3.9.1 Inter-Signal Correction .................................................................................................... 493.5.3.9.2 L1/L2 Ionospheric Correction ......................................................................................... 503.5.3.9.3 L1/L5 Ionospheric Correction ......................................................................................... 513.5.3.10 Integrity Assurance ................................................................................................................. 513.5.3.10.1 Integrity Status Flag (ISF)............................................................................................. 523.5.4 Subframe 3 .......................................................................................................................................... 523.5.4.1 Subframe 3, Page 1 – UTC & IONO ......................................................................................... 523.5.4.1.1 UTC Parameter Content .................................................................................................. 523.5.4.1.1.1 UTC and GPS Time .............................................................................................. 523.5.4.1.2 Ionospheric Data ............................................................................................................. 533.5.4.2 Subframe 3, Page 2 – GGTO & EOP ........................................................................................ 543.5.4.2.1 GGTO Parameter Content ............................................................................................... 543.5.4.2.1.1 GPS and GNSS Time ............................................................................................ 543.5.4.2.2 EOP Parameter Content .................................................................................................. 55vIS-GPS-800A8 June 2010
- Page 1 and 2: IS-GPS-800A8 June 2010GLOBAL POSITI
- Page 3: REVISION RECORDLTR DESCRIPTION DATE
- 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 42 and 43: DIRECTION OF DATA FLOW FROM SV100 B
- Page 44 and 45: 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
3.2.3.3 Cyclic Redundancy Check ........................................................................................................ 203.2.3.4 Low Density Parity Check (LDPC) Code ................................................................................. 213.2.3.5 Interleaving ............................................................................................................................... 233.3 Signal Modulation ......................................................................................................................................... 253.4 Interface Criteria ............................................................................................................................................ 283.4.1 <strong>GPS</strong> Time ............................................................................................................................................ 283.4.2 SV Time vs. <strong>GPS</strong> Time ....................................................................................................................... 283.4.3 Speed of Light ..................................................................................................................................... 283.5 Message Definition ........................................................................................................................................ 293.5.1 Message Content ................................................................................................................................. 293.5.2 Subframe 1 .......................................................................................................................................... 293.5.3 Subframe 2 .......................................................................................................................................... 383.5.3.1 Transmission Week Number ..................................................................................................... 423.5.3.2 ITOW ........................................................................................................................................ 423.5.3.3 Data Predict Time of Week ....................................................................................................... 423.5.3.4 L1C Signal Health ..................................................................................................................... 423.5.3.5 SV Accuracy ............................................................................................................................. 423.5.3.6 Ephemeris Parameter Characteristics ........................................................................................ 443.5.3.6.1 User Algorithm for Determination of SV Position .......................................................... 443.5.3.7 Clock Parameter Characteristics ............................................................................................... 463.5.3.7.1 User Algorithms for SV Clock Correction Data ............................................................. 463.5.3.8 SV Clock Accuracy Estimates .................................................................................................. 473.5.3.9 Group Delay Correction Parameters ......................................................................................... 493.5.3.9.1 Inter-Signal Correction .................................................................................................... 493.5.3.9.2 L1/L2 Ionospheric Correction ......................................................................................... 503.5.3.9.3 L1/L5 Ionospheric Correction ......................................................................................... 513.5.3.10 Integrity Assurance ................................................................................................................. 513.5.3.10.1 Integrity Status Flag (<strong>IS</strong>F)............................................................................................. 523.5.4 Subframe 3 .......................................................................................................................................... 523.5.4.1 Subframe 3, Page 1 – UTC & IONO ......................................................................................... 523.5.4.1.1 UTC Parameter Content .................................................................................................. 523.5.4.1.1.1 UTC and <strong>GPS</strong> Time .............................................................................................. 523.5.4.1.2 Ionospheric Data ............................................................................................................. 533.5.4.2 Subframe 3, Page 2 – GGTO & EOP ........................................................................................ 543.5.4.2.1 GGTO Parameter Content ............................................................................................... 543.5.4.2.1.1 <strong>GPS</strong> and GNSS Time ............................................................................................ 543.5.4.2.2 EOP Parameter Content .................................................................................................. 55v<strong>IS</strong>-<strong>GPS</strong>-<strong>800A</strong>8 June 2010
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