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IS-GPS-705A, Jun 2010 IS-GPS-705A 8 June 2010 GLOBAL POSITIONING SYSTEM WING (GPSW) SYSTEMS ENGINEERING & INTEGRATION INTERFACE SPECIFICATION IS-GPS-705 Revision A Navstar GPS Space Segment / User Segment L5 Interfaces AUTHENTICATED BY: ___________________________________ DAVID B. GOLDSTEIN, Col Chief Engineer Global Positioning Systems Wing DISTRIBUTION STATEMENT A.: Approved for Public Release; Distribution is Unlimited. REVISIONS DESCRIPTION DATE IS-GPS-705, Initial Release 24 November 2003 IRN-705-001 05 January 2005 IRN-705-002 20 April 2005 IRN-705-003 22 September 2005 IS-GPS-705, Rev A 8 June 2010 DISTRIBUTION STATEMENT A APPROVED FOR PUBLIC RELEASE; DISTRIBUTION IS UNLIMITED. APPROVALS AUTHORIZED SIGNATURES REPRESENTING DATE GPS NAVSTAR GPS Wing Signature on file 8 June 2010 SMC/GP INTERFACE SPECIFICATION Prepared by : UNLESS OTHERWISE SPECIFIED: DR DIMENSIONS ARE IN INCHES. Science Applications International Corporation TOLERANCES ON: BY 300 N. Sepulveda Blvd., Suite 3000 El Segundo, CA 90245 DECIMALS ANGLES CH XX = ±0.03 ±0° 30' XXX = ±0.01 K APPROVALS IS TITLE BY Navstar GPS Space Segment / User THIS DOCUMENT SPECIFIES TECHNICAL REQUIREMENTS AND Segment L5 Interfaces NOTHING HEREIN CONTAINED SHALL BE DEEMED TO ALTER THE TERMS OF ANY CONTRACT OR PURCHASE SIZE CODE DRAWING NO. ORDER BETWEEN ALL PARTIES AFFECTED. A IDENT NO. IS-GPS-705 4WNC1 SCALE: REV: A SHEET I N/A ii IS-GPS-705A 8 June 2010 REVISION RECORD LTR DESCRIPTION DATE APPROVED NC Initial Release 24 Nov 03 24 Nov 03 A Incorporates GPSIIIA changes 8 Jun 2010 8 Jun 2010 N/A SE&I Tech Pubs 29 July 2010 iii IS-GPS-705A 8 June 2010 TABLE OF CONTENTS 1. INTRODUCTION .................................................................................................................................................. 1 1.1 SCOPE .................................................................................................................................................................. 1 1.2 IS APPROVAL AND CHANGES ............................................................................................................................... 1 2. APPLICABLE DOCUMENTS .............................................................................................................................. 2 2.1 GOVERNMENT DOCUMENTS................................................................................................................................. 2 2.2 NON-GOVERNMENT DOCUMENTS ........................................................................................................................ 2 3. REQUIREMENTS ................................................................................................................................................. 3 3.1 INTERFACE DEFINITION. ...................................................................................................................................... 3 3.2 INTERFACE IDENTIFICATION ................................................................................................................................ 3 3.2.1 Ranging Codes ............................................................................................................................................. 3 3.2.1.1 L5-Codes ................................................................................................................................................................ 4 3.2.1.2 Non-Standard Codes ............................................................................................................................................... 4 3.2.2 NAV Data ..................................................................................................................................................... 4 3.2.3 L5 Signal Structure ...................................................................................................................................... 7 3.3 INTERFACE CRITERIA ........................................................................................................................................... 7 3.3.1 Composite Signal ......................................................................................................................................... 7 3.3.1.1 Frequency Plan ....................................................................................................................................................... 7 3.3.1.2 Correlation Loss...................................................................................................................................................... 7 3.3.1.3 Carrier Phase Noise ................................................................................................................................................ 7 3.3.1.4 Spurious Transmissions .......................................................................................................................................... 8 3.3.1.5 Phase Quadrature .................................................................................................................................................... 8 3.3.1.6 Signal Power Levels ............................................................................................................................................... 8 3.3.1.6.1 Space Service Volume (SSV) Received Signal Power Levels ........................................................................ 9 3.3.1.7 Equipment Group Delay ......................................................................................................................................... 9 3.3.1.7.1 Group Delay Uncertainty............................................................................................................................... 10 3.3.1.7.2 Group Delay Differential ............................................................................................................................... 10 3.3.1.7.3 Space Service Volume Group Delay Differential. ......................................................................................... 10 3.3.1.8 Signal Coherence .................................................................................................................................................. 10 3.3.1.9 Signal Polarization ................................................................................................................................................ 10 3.3.2 PRN Code Characteristics ......................................................................................................................... 10 3.3.2.1 Code Structure ...................................................................................................................................................... 11 3.3.2.2 Code Generation ................................................................................................................................................... 12 3.3.2.3 Q5 Synchronization Sequence .............................................................................................................................. 15 3.3.3 Navigation Data......................................................................................................................................... 15 3.3.3.1 Navigation Data Modulation ................................................................................................................................. 15 iv IS-GPS-705A 8 June 2010 3.3.3.1.1 Forward Error Correction .............................................................................................................................. 15 3.3.3.1.2 Neuman-Hofman Code .................................................................................................................................. 16 3.3.4 GPS Time and SV Z-Count ........................................................................................................................ 16 4. NOT APPLICABLE .......................................................................................................................................... 19 5. NOT APPLICABLE .......................................................................................................................................... 20 6. NOTES................................................................................................................................................................ 21 6.1 ACRONYMS................................................................................................................................................... 21 6.2 DEFINITIONS ...................................................................................................................................................... 23 6.2.1 User Range Accuracy ................................................................................................................................ 23 6.2.2 SV Block Definitions .................................................................................................................................. 23 6.2.2.1 Developmental SVs .............................................................................................................................................. 23 6.2.2.2 Operational SVs .................................................................................................................................................... 23 6.2.2.2.1 Block IIA SVs ..............................................................................................................................................
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