IS-GPS-800A - US Coast Guard Navigation Center
IS-GPS-800A - US Coast Guard Navigation Center IS-GPS-800A - US Coast Guard Navigation Center
LIST OF TABLESTable 3.2-1. Received Minimum RF Signal Strength ........................................................................................... 6Table 3.2-2. L1C Ranging Codes Parameter Assignments ................................................................................... 9Table 3.2-3. L1C O Overlay Code Parameter Assignments .................................................................................. 12Table 3.5-1. Subframe 2 Parameters ................................................................................................................... 39Table 3.5-2. Elements of Coordinate System ...................................................................................................... 45Table 3.5-3. UTC Parameters .............................................................................................................................. 53Table 3.5-4. GPS/GNSS Time Offset Parameters ............................................................................................... 55Table 3.5-5. Earth Orientation Parameters .......................................................................................................... 56Table 3.5-6. Reduced Almanac Parameters ......................................................................................................... 59Table 3.5-7. Midi Almanac Parameters ............................................................................................................... 60Table 3.5-8. Differential Correction Parameters ................................................................................................. 63Table 6.2-1. Legendre Sequence ......................................................................................................................... 70Table 6.2-2. LDPC Submatrix A for Subframe 2 ................................................................................................ 71Table 6.2-3. LDPC Submatrix B for Subframe 2 ................................................................................................ 82Table 6.2-4. LDPC Submatrix C for Subframe 2 ................................................................................................ 82Table 6.2-5. LDPC Submatrix D for Subframe 2 ................................................................................................ 82Table 6.2-6. LDPC Submatrix E for Subframe 2 ................................................................................................ 82Table 6.2-7. LDPC Submatrix T for Subframe 2 ................................................................................................ 83Table 6.2-8. LDPC Submatrix A for Subframe 3 ................................................................................................ 87Table 6.2-9. LDPC Submatrix B for Subframe 3 ................................................................................................ 92Table 6.2-10. LDPC Submatrix C for Subframe 3 ................................................................................................ 92Table 6.2-11. LDPC Submatrix D for Subframe 3 ................................................................................................ 92Table 6.2-12. LDPC Submatrix E for Subframe 3 ................................................................................................ 92Table 6.2-13. LDPC Submatrix T for Subframe 3 ................................................................................................ 93Table 6.2-14. Number of 1’s in LDPC Submatrix A for Subframe 2 .................................................................... 95Table 6.2-15. Number of 1’s in LDPC Submatrix T for Subframe 2 .................................................................... 95Table 6.2-16. Number of 1’s in LDPC Submatrix A for Subframe 3 .................................................................... 96Table 6.2-17. Number of 1’s in LDPC Submatrix T for Subframe 3 .................................................................... 97Table 6.3-1. Additional L1C Ranging Codes Parameter Assignments ............................................................... 98Table 6.3-2. Additional L1C O Overlay Code Parameter Assignments .............................................................. 106viiiIS-GPS-800A8 June 2010
1. INTRODUCTION1.1 ScopeThis Interface Specification (IS) defines the characteristics of a signal transmitted from Global Positioning System(GPS) satellites to navigation receivers on radio frequency (RF) link 1 (L1). While there are multiple signalsbroadcast within the frequency band of L1, this IS defines only the signal denoted L1 Civil (L1C). Throughout thisdocument, the L1 carrier denotes 1575.42 MHz.1.2 Interface DefinitionUtilizing the L1 open link defined in this document, GPS space vehicles (SVs), except Block II/IIA, IIR/IIR-M, andIIF SVs, shall transmit continuous earth coverage L1C signal that provides the ranging codes and the system dataneeded to accomplish the navigation mission to all users having RF visibility to SVs and suitable receivers.1.3 IS Approval and ChangesThe GPS Wing (GPSW) is the necessary authority to make this IS effective. The GPSW administers approvalsunder the auspices of the Configuration Control Board (CCB), which is governed by the appropriate GPSWOperating Instruction. The GPSW CCB membership includes the United States Department of Transportationrepresentative for civil organizations and public interest.The Interface Control Contractor (ICC), designated by the government, is responsible for the basic preparation,obtaining approval, distribution, retention, and Interface Control Working Group (ICWG) coordination of this IS inaccordance with GP-03-001A.A proposal to change the approved version of this IS can be submitted by any ICWG participating organization tothe GPSW and/or the ICC. The ICC is responsible for the preparation of the change paper and change coordinationin the form of a Proposed Interface Revision Notice (PIRN) and is responsible for coordination of PIRNs with theICWG. The ICWG coordinated PIRN must be submitted as an Interface Revision Notice (IRN) to the GPSW CCBfor review and approval.1 IS-GPS-800A8 June 2010
- Page 1 and 2: 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: LIST OF FIGURESFigure 3.2-1. Genera
- 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
- Page 54 and 55: Table 3.5-2. Elements of Coordinate
- Page 56 and 57: The user shall use the broadcast UR
L<strong>IS</strong>T OF TABLESTable 3.2-1. Received Minimum RF Signal Strength ........................................................................................... 6Table 3.2-2. L1C Ranging Codes Parameter Assignments ................................................................................... 9Table 3.2-3. L1C O Overlay Code Parameter Assignments .................................................................................. 12Table 3.5-1. Subframe 2 Parameters ................................................................................................................... 39Table 3.5-2. Elements of Coordinate System ...................................................................................................... 45Table 3.5-3. UTC Parameters .............................................................................................................................. 53Table 3.5-4. <strong>GPS</strong>/GNSS Time Offset Parameters ............................................................................................... 55Table 3.5-5. Earth Orientation Parameters .......................................................................................................... 56Table 3.5-6. Reduced Almanac Parameters ......................................................................................................... 59Table 3.5-7. Midi Almanac Parameters ............................................................................................................... 60Table 3.5-8. Differential Correction Parameters ................................................................................................. 63Table 6.2-1. Legendre Sequence ......................................................................................................................... 70Table 6.2-2. LDPC Submatrix A for Subframe 2 ................................................................................................ 71Table 6.2-3. LDPC Submatrix B for Subframe 2 ................................................................................................ 82Table 6.2-4. LDPC Submatrix C for Subframe 2 ................................................................................................ 82Table 6.2-5. LDPC Submatrix D for Subframe 2 ................................................................................................ 82Table 6.2-6. LDPC Submatrix E for Subframe 2 ................................................................................................ 82Table 6.2-7. LDPC Submatrix T for Subframe 2 ................................................................................................ 83Table 6.2-8. LDPC Submatrix A for Subframe 3 ................................................................................................ 87Table 6.2-9. LDPC Submatrix B for Subframe 3 ................................................................................................ 92Table 6.2-10. LDPC Submatrix C for Subframe 3 ................................................................................................ 92Table 6.2-11. LDPC Submatrix D for Subframe 3 ................................................................................................ 92Table 6.2-12. LDPC Submatrix E for Subframe 3 ................................................................................................ 92Table 6.2-13. LDPC Submatrix T for Subframe 3 ................................................................................................ 93Table 6.2-14. Number of 1’s in LDPC Submatrix A for Subframe 2 .................................................................... 95Table 6.2-15. Number of 1’s in LDPC Submatrix T for Subframe 2 .................................................................... 95Table 6.2-16. Number of 1’s in LDPC Submatrix A for Subframe 3 .................................................................... 96Table 6.2-17. Number of 1’s in LDPC Submatrix T for Subframe 3 .................................................................... 97Table 6.3-1. Additional L1C Ranging Codes Parameter Assignments ............................................................... 98Table 6.3-2. Additional L1C O Overlay Code Parameter Assignments .............................................................. 106viii<strong>IS</strong>-<strong>GPS</strong>-<strong>800A</strong>8 June 2010
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