Receiver for bandspread signals, particularly GPS receiver

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

1989-03-13

1991-05-14

Cangialosi, Salvatore

Pulse or digital communications

Repeaters

Testing

380 34, H04K 100

Patent

active

050162578

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.

REFERENCES:
patent: 4317204 (1982-02-01), Gordy et al.
patent: 4494238 (1985-01-01), Groth, Jr.
patent: 4554668 (1985-11-01), Deman et al.
patent: 4639932 (1987-01-01), Schiff
patent: 4672629 (1987-06-01), Beier
patent: 4701934 (1987-10-01), Jasper
patent: 4761795 (1988-08-01), Beier
patent: 4841544 (1989-06-01), Nuytkens
Navigation: The Journal of Navigation, "GPS Signal Structure and Performance Characteristics", J. J. Spilker, Jr., pp. 121-146.

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