P-code-aided global positioning system receiver

Details P-code-aided global positioning system receiver P-code-aided global positioning system receiver

1989-09-25

1990-11-20

Cangialosi, Salvatore

Pulse or digital communications

Repeaters

Testing

380 9, 342357, H04K 100, H04B 7185

Patent

active

049724312

ABSTRACT:
Method and apparatus for use in a global positioning system (GPS), to obtain the benefit of L2 carrier signals and precise-code (P-code) signals transmitted from satellites in encrypted form. Received, encrypted P-code signals are correlated with a locally generated P-code sequence and the resulting signal is bandpass filtered and squared, to separate one satellite signal from the others, to recover the carrier signal and make accurate measurement of its phase and pseudorange, even though the received P-code sequence is encrypted. Because the squaring step is performed over a narrower bandwidth than the original P-code, there is less degradation in the signal-to-noise ratio of the received signal, as compared with squaring over the entire P-code bandwidth. Therefore, performance is more reliable under weak signal conditions or when there are interference signals present, and the improvement in signal quality means that cycle ambiguity of the carrier signals can be resolved more rapidly. Moreover, the invention does not frustrate the intended purpose of P-code encryption.

REFERENCES:
patent: 4667203 (1987-05-01), Counselman, III
patent: 4701934 (1987-10-01), Jasper et al.
patent: 4785463 (1988-11-01), Janc et al.
patent: 4870422 (1989-09-01), Counselman, III

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