IS-GPS-800D (797938)
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REVISION RECORDLTRNCAN/ABDESCRIPTIONDATEAPPROVEDInitial Release04 Sept 200804 Sept 2008Incorporates Phase Variance language revision,attitude error from coverage angle specifications,addition of Space Service Volume (SSV) language,and addition of Integrity Flag description language8 June 20108 June 2010SE&I Tech Pubs29 July 2010IRN-IS-800A-001 (RFC 16B - Pseudorandom Noise(PRN) Expansion)21 Sep 201108 Mar 2012IRN-IS-800B-00121 Sep 201117 Apr 2012IRN-IS-800B-002 (RFC 139B – Public Signals-inSpace Updates05 Sep 201231 Jan 201324 Sep 201321 Mar 2014IRN-IS-800A-002 (RFC 77B - Public DocumentManagement (GPS III terminology and Space ServiceVolume (SSV) group delay))IRN-IS-800A -003 (RFC 86 - User Range Accuracy(URA) Definition)IRN-IS-800A-004 (RFC 93 - Technical Note 36)IRN-IS-800A-005 (RFC 97 - Pseudorange Parameters)CIRN-IS-800B-003 (RFC 118 – L1C Phase Noise)DIRN-IS-800C-001 (L1C Data Predict Week Number(WNop)IRN-IS-800C-002(PublicRequirements Disconnects)SignalsinSpaceIRN-IS-800C-003 (CNAV Reference Times)IRN-IS-800C-004Assignments)(PRNs211-1023i23 Jan 2014MissionIS-GPS-800D24 Sep 2013TABLE OF CONTENTS123INTRODUCTION ..................................................................................................................
11.1Scope ................................................................................................................................ 11.2Interface Definition .......................................................................................................... 11.3IS Approval and Changes................................................................................................. 1APPLICABLE DOCUMENTS ..............................................................................................
12.1Applicable Documents ..................................................................................................... 12.2Reference Documents ...................................................................................................... 2SIGNAL REQUIREMENTS .................................................................................................. 23.1Signal Structure ................................................................................................................ 23.2Signal Definition ..............................................................................................................
33.2.1Signal Characteristics................................................................................................ 33.2.2PRN Code Characteristics......................................................................................... 63.2.3Message Characteristics .......................................................................................... 183.3Signal Modulation ..........................................................................................................
253.4Interface Criteria ............................................................................................................ 293.4.1GPS Time ................................................................................................................ 293.4.2SV Time vs. GPS Time........................................................................................... 293.4.3Speed of Light ......................................................................................................... 293.5Message Definition ........................................................................................................
303.5.1Message Content ..................................................................................................... 303.5.2Subframe 1 .............................................................................................................. 303.5.3Subframe 2 .............................................................................................................. 393.5.4Subframe 3 .............................................................................................................. 563.5.5Timing Relationships .............................................................................................. 69iiIS-GPS-800D24 Sep 20134NOT APPLICABLE .............................................................................................................
705RESERVED .......................................................................................................................... 716NOTES .................................................................................................................................. 726.1Acronyms .......................................................................................................................
726.2Definitions ...................................................................................................................... 756.2.1User Range Accuracy ............................................................................................. 756.2.2GPS Week Number ................................................................................................. 766.2.3Legendre Sequence .................................................................................................
766.2.4LDPC Submatrices.................................................................................................. 766.3Supporting Material...................................................................................................... 1036.3.1Additional PRN Sequences ................................................................................... 1036.3.2Pre-Operational Use ..............................................................................................
1196.3.3Integrated Phase Noise Characteristics. ................................................................ 1196.4Operational Protocols ................................................................................................... 1196.4.1Lower PRN Numbers Versus Upper PRN Numbers ............................................ 1196.4.2PRN Number Consistency .................................................................................... 1196.4.3PRNs 33 and 37 .................................................................................................... 1196.4.4PRNs 33 through 63 ..............................................................................................
119iiiIS-GPS-800D24 Sep 2013LIST OF FIGURESFigure 3.2-1.Generation of L1CP-/L1CD-Codes ...................................................................... 16Figure 3.2-2.L1CO-Code Generator Configuration.................................................................. 17Figure 3.2-3.L1C Message Structure ....................................................................................... 19Figure 3.2-4.BCH (51, 8) Code Generator............................................................................... 20Figure 3.2-5.Parity Check Matrix H for LDPC Code .............................................................. 23Figure 3.2-6.Conceptual Block Interleaver ..............................................................................
25Figure 3.3-1.L1CP-/L1CD-/L1CO-Code Timing Relationships ................................................ 27Figure 3.3-2.Subcarrier Polarity Mapping ............................................................................... 28Figure 3.5-1.Subframe 2 - Clock, Ephemeris, ITOW .............................................................. 32Figure 3.5-2.Subframe 3, Page 1 - UTC & IONO ................................................................... 33Figure 3.5-3Subframe 3, Page 2 .............................................................................................
34Figure 3.5-4.Subframe 3, Page 3 - Reduced Almanac ............................................................. 35Figure 3.5-5.Subframe 3, Page 4 - Midi Almanac ................................................................... 36Figure 3.5-6.Subframe 3, Page 5 - Differential Correction ..................................................... 37Figure 3.5-7.Subframe 3, Page 6 – Text .................................................................................. 38Figure 3.5-8.Subframe 3, Page 7 - (Reserved) .........................................................................
39Figure 3.5-9.Reduced Almanac Packet Content ...................................................................... 63Figure 3.5-10.Differential Correction Data Packet ................................................................ 67ivIS-GPS-800D24 Sep 2013LIST OF TABLESTable 3.2-1.Received Minimum RF Signal Strength ............................................................... 6Table 3.2-2.L1C Ranging Codes Parameter Assignments (sheet 1 of 3) .............................. 10Table 3.2-2L1C Ranging Codes Parameter Assignments (sheet 2 of 3) .............................. 11Table 3.2-2L1C Ranging Codes Parameter Assignments (sheet 3 of 3) ..............................
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