IS-GPS-800A - US Coast Guard Navigation Center

TABLE 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 (TBR).......................................................................................................... 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 ............................................................................................................... 53.2.1.7 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 .................................................................................................. 63.2.1.8.3 Space Service Volume (SSV) Group Delay Differential .................................................. 63.2.1.9 Signal Power Levels .................................................................................................................... 63.2.2 PRN Code Characteristics ..................................................................................................................... 73.2.2.1 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 ................................................................................................ 18ivIS-GPS-800A8 June 2010