navstar global positioning system interface specification ... - GPS.gov

TABLE OF CONTENTS1. SCOPE.....................................................................................................................................................................11.1 Scope ...............................................................................................................................................................11.2 IS Approval and Changes................................................................................................................................12. APPLICABLE DOCUMENTS..............................................................................................................................32.1 Government Documents..................................................................................................................................32.2 Non-Government Documents..........................................................................................................................33. REQUIREMENTS .................................................................................................................................................53.1 Interface Definition .........................................................................................................................................53.2 Interface Identification ....................................................................................................................................53.2.1 Ranging Codes ......................................................................................................................................53.2.1.1 P-Code.........................................................................................................................................63.2.1.2 Y-Code ........................................................................................................................................63.2.1.3 C/A-Code ....................................................................................................................................63.2.1.4 L2 CM-Code (IIR-M, IIF, and subsequent blocks) .....................................................................63.2.1.5 L2 CL-Code (IIR-M, IIF, and subsequent blocks) ......................................................................63.2.1.6 Non-Standard Codes .................................................................................................................113.2.2 NAV Data............................................................................................................................................113.2.3 L1/L2 Signal Structure ........................................................................................................................123.3 Interface Criteria............................................................................................................................................143.3.1 Composite Signal ................................................................................................................................143.3.1.1 Frequency Plan..........................................................................................................................143.3.1.2 Correlation Loss ........................................................................................................................143.3.1.3 Carrier Phase Noise...................................................................................................................143.3.1.4 Spurious Transmissions.............................................................................................................143.3.1.5 Phase Quadrature.......................................................................................................................153.3.1.6 User-Received Signal Levels ....................................................................................................153.3.1.7 Equipment Group Delay............................................................................................................173.3.1.7.1 Group Delay Uncertainty ................................................................................................173.3.1.7.2 Group Delay Differential ................................................................................................173.3.1.8 Signal Coherence.......................................................................................................................173.3.1.9 Signal Polarization ....................................................................................................................173.3.2 PRN Code Characteristics ...................................................................................................................183.3.2.1 Code Structure...........................................................................................................................18viiIRN-200D-001IS-GPS-200D7 Mar 2006