Receiver for bandspread signals, particularly gps receiver

Details Receiver for bandspread signals, particularly gps receiver Receiver for bandspread signals, particularly gps receiver

G - Physics

01

S

343/69

G01S 5/14 (2006.01) G01S 1/00 (2006.01) H03L 7/087 (2006.01) H04B 1/707 (2006.01)

Patent

CA 1327069

Abstract Receiver for Bandspread Signals, Particularly GPS Receiver Receivers for bandwidth signals have a carrier PLL (20) for the carrier frequency and phase and a code PLL (20,30 ...34) of 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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