Receiver for bandspread signals, particularly GPS receiver
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United States of America Patent
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May 14, 1991
Grant Date -
N/A
app pub date -
Mar 13, 1989
filing date -
Mar 12, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Receivers for bandspread signals have a carrier PLL (20) for the carrier frequency and phase and a code PLL (20, 30 . . . 34) for the code frequency and phase. To be able to receive even very noisy signals, the carrier PLL, in particular, must have a very narrow bandwidth. This results in a very narrow capture range. According to the invention, instead of employing a complicated search strategy, advantage is taken of the fact that the code PLL locks in more easily. A signal is taken from the code PLL which indicates the difference between the desired value and the actual value of the code frequency. This signal is fed as an additional control signal to the carrier PLL.
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