GPS receiver capable of receiving C/A and P codes on multiple channels
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United States of America Patent
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Jul 27, 2004
Grant Date -
N/A
app pub date -
Oct 13, 1998
filing date -
Nov 13, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a multi-channel type GPS receiver which is able to shorten the search time for a cold start, wherein a carrier tracking circuit 10, code tracking circuit 12, C/A code generator 14 are provided at the L1-C/A code receiving channel side, a C/A code generator 20 is provided at the L1-P code receiving channel side in addition to the code tracking circuit 16 and P code generator 18. Thereby, the code generator 20 and tracking circuit 16 are changed over and connected to each other by a switching means 22 when carrying out a search mode for a cold start. A C/A code generator 30 is provided at the L2-P code receiving channel side in addition to a carrier tracking circuit 24, code tracking circuit 26 and P code generator 28, whereby the code generator 30 is changed and connected to the tracking circuit 26 by a switching means 32 when carrying out the search mode during a cold start.
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