IS-GPS-800F 4-MAR-2019 GLOBAL POSITIONING SYSTEMS .

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IS-GPS-800F4-MAR-2019GLOBAL POSITIONING SYSTEMS DIRECTORATESYSTEMS ENGINEERING & INTEGRATIONINTERFACE SPECIFICATIONIS-GPS-800Navstar GPS Space Segment/User Segment L1C InterfacesAUTHENTICATED BY:Michael J. Dunn, DISL, DAFDateTechnical DirectorGlobal Positioning Systems DirectorateDISTRIBUTION STATEMENT A: Approved for Public Release; Distribution Is Unlimited

REVISION RECORDLTRDESCRIPTIONDATEAPPROVEDNCInitial ReleaseIncorporates Phase Variance language revision,attitude error from coverage angle specifications,addition of Space Service Volume (SSV) language,and addition of Integrity Flag description languageSE&I Tech Pubs24 Nov 0324 Nov 038 Jun 20108 Jun 2010AN/A29 Jul 2010IRN-IS-800A-001 (RFC 16B – PseudorandomNoise (PRN) Expansion)IRN-IS-800A-002 (RFC 77B – Public DocumentManagement (GPS III terminology and SpaceService Volume (SSV) group delay))BIRN-IS-800A -003 (RFC 86 – User Range Accuracy(URA) Definition)21 Sep 20118 Dec 201121 Sep 20118 Dec 201105 Sep 201231 Jan 2013IRN-IS-800A-004 (RFC 93 – Technical Note 36)IRN-IS-800A-005 (RFC 97 – 0B-002 (RFC 139B – Public Signals-inSpace Updates)IRN-IS-800B-003 (RFC 118 – L1C Phase Noise)IRN-IS-800C-001 (RFC 183A – L1C Data PredictWeek Number (WNop))IRN-IS-800C-002 (RFC 188B – Public Signals inSpace Requirements Disconnects)IRN-IS-800C-003 (RFC 193 – CNAV ReferenceTimes)IRN-IS-800C-004 (RFC 198 – PRNs 211-1023Mission Assignments)IRN-IS-800D-001 (RFC 267 – L5 and L1C PhaseNoise Plot)IRN-IS-800D-002 (RFC 268 – Incorrect CNAV-2Message Structure Reference for IAURANEDParameters)IRN-IS-800D-003 (RFC 312 – Definition Clarificationfor Time of Predict)IRN-IS-800D-004A (RFC 318 – 2016 PublicDocument Clean-Up)Up Rev ReleaseIRN-IS-800E-001 (RFC-374 – 2018 Public DocumentProposed Changes)21 Mar 201424 Sep 201323 Jan 201409 Dec 201524 Mar 201625 May 201712 Jun 201721 Sep 201619 Jan 201725 Apr 201822 May 201828 Nov 20184 Mar 2019

IS-GPS-800F4 Mar 2019TABLE 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. 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 . 43.2.1.7 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 . 5i

IS-GPS-800F4 Mar 20193.2.1.8.3 Space Service Volume (SSV) Group Delay Differential . 53.2.1.9 Signal Power Levels . 63.2.2 PRN Code Characteristics. 63.2.2.1 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 . 183.2.3.3 Cyclic Redundancy Check . 193.2.3.4 Low Density Parity Check (LDPC) Code . 213.2.3.5 Interleaving . 223.3 Signal Modulation . 243.4 Interface Criteria . 273.4.1 GPS Time . 273.4.2 SV Time vs. GPS Time . 273.4.3 Speed of Light . 273.5 Message Definition . 283.5.1 Message Content . 283.5.2 Subframe 1 . 283.5.3 Subframe 2 . 353.5.3.1 Transmission Week Number. 403.5.3.2 ITOW . 403.5.3.3 CEI Data Sequence Propagation Time of Week. . 403.5.3.4 L1C Signal Health. 40ii

IS-GPS-800F4 Mar 20193.5.3.5 SV Accuracy . 413.5.3.6 Ephemeris Parameter Characteristics . 433.5.3.6.1 User Algorithm for Determination of SV Position . 433.5.3.7 Clock Parameter Characteristics . 453.5.3.7.1 User Algorithms for SV Clock Correction Data . 453.5.3.8 Non-Elevation Dependent (NED) Accuracy Estimates . 463.5.3.9 Group Delay Correction Parameters . 493.5.3.9.1 Inter-Signal Correction . 503.5.3.9.2 L1/L2 Ionospheric Correction. 503.5.3.9.3 L1/L5 Ionospheric Correction. 513.5.3.10 Integrity Assurance . 523.5.3.10.1 Integrity Status Flag (ISF) . 523.5.3.11 CEI Data Sequence Propagation Week Number. . 523.5.4 Subframe 3 . 533.5.4.1 Subframe 3, Page 1 - UTC & IONO . 533.5.4.1.1 UTC Parameter Content . 533.5.4.1.2 Ionospheric Data . 543.5.4.2 Subframe 3, Page 2 - GGTO & EOP . 543.5.4.2.1 GGTO Parameter Content. 553.5.4.2.2 EOP Parameter Content . 563.5.4.2.3 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. 583.5.4.3.2 Almanac Reference Time . 583.5.4.3.3 SV PRN Number. 583.5.4.3.4 Signal Health (L1/L2/L5) . 58iii

IS-GPS-800F4 Mar 20193.5.4.3.5 Reduced Almanac Data. 583.5.4.3.6 Midi Almanac Parameter Content . 603.5.4.4 Subframe 3, Page 5 - Differential Correction . 603.5.4.4.1 Differential Correction Parameter Content . 613.5.4.4.2 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 . 613.5.4.5 Subframe 3, Page 6 - Text. 633.5.4.6 Subframe 3, Page 7 - (Reserved) . 633.5.5 Timing Relationships . 643.5.5.1 Paging and Cutovers . 643.5.5.2 CEI Data Sets . 643.5.5.3 Reference Times . 646 NOTES . 656.1 Acronyms . 656.2 Definitions. 676.2.1 User Range Accuracy . 676.2.1.1 User Differential Range Accuracy . 686.2.2 GPS Week Number . 686.2.3 Legendre Sequence . 686.2.4 LDPC Submatrices. 686.2.5 Reserved Data . 946.2.6 Valid Range . 946.2.7 Invalid Range . 946.2.8 Clock, Ephemeris, Integrity (CEI) Data Set. . 946.2.8.1 Core CEI Data Set. . 95iv

IS-GPS-800F4 Mar 20196.2.9 CEI Data Sequence Propagation. . 966.3 Supporting Material . 966.3.1 Additional PRN Sequences . 966.3.1.1 Additional L1C Ranging Code Sequences . 976.3.1.2 Additional L1C Overlay Code Sequences . 1036.3.2 Pre-Operational Use . 1106.3.3 Integrated Phase Noise Characteristics. . 1116.4 Operational Protocols. 1116.4.1 Lower PRN Numbers Versus Upper PRN Numbers . 1116.4.2 PRN Number Consistency . 1116.4.3 PRNs 33 and 37 . 1116.4.4 PRNs 33 through 63 . 111v

IS-GPS-800F4 Mar 2019LIST OF TABLESTable 3.2-1.Received Minimum RF Signal Strength . 6Table 3.2-2.L1C Ranging Codes Parameter Assignments (sheet 1 of 3) . 9Table 3.2-2L1C Ranging Codes Parameter Assignments (sheet 2 of 3) . 10Table 3.2-2L1C Ranging Codes Parameter Assignments (sheet 3 of 3) . 11Table 3.2-3.L1CO Overlay Code Parameter Assignments (sheet 1 of 3) . 12Table 3.2-3L1CO Overlay Code Parameter Assignments (sheet 2 of 3) . 13Table 3.2-3L1CO Overlay Code Parameter Assignments (sheet 3 of 3) . 14Table 3.5-1.Subframe 2 Parameters (1 of 3).

SYSTEMS ENGINEERING & INTEGRATION INTERFACE SPECIFICATION IS-GPS-800 Navstar GPS Space Segment/User Segment L1C Interfaces . IRN-IS-800B-002 (RFC 139B – Public Signals-in-Space Updates) 05 Sep 2012 31 Jan 2013 IRN-IS-800B-003 (RFC 118 – L1C Phase Noise) D

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