Pulse or digital communications – Repeaters – Testing
Patent
1993-08-17
1995-03-28
Cangialosi, Salvatore
Pulse or digital communications
Repeaters
Testing
342357, G01S 502
Patent
active
054024412
ABSTRACT:
A GPS signal receiver has a PN code generator for producing a PN code identical to a PN code in a received GPS signal which is transmitted from a GPS satellite, the PN code produced by the PN code generator being controllable in phase, a PN code correlator for correlating the received GPS signal with the PN code produced by the PN code generator so as to code-strip the received GPS signal, a signal search unit for monitoring a correlated output signal from the PN code correlator and controlling the phase of the PN code produced by the PN code generator to search for a correlated output signal in excess of a predetermined value, a signal determining unit for determining the correlated output signal in excess of the predetermined value as being produced by a direct wave of the GPS signal, and a signal tracking unit for controlling the phase of the PN code produced by the PN code generator to track a peak of the correlated output signal that is determined as being produced by the direct wave of the GPS signal.
REFERENCES:
patent: 4646096 (1987-02-01), Brown
patent: 4894662 (1990-01-01), Counselman
patent: 4972431 (1990-11-01), Keegan
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5157691 (1992-10-01), Ohkubo et al.
patent: 5185610 (1993-02-01), Ward et al.
patent: 5309474 (1994-05-01), Gilhousen et al.
Global Positioning System, The Institute of Navigation, 1980, pp. 8-11, 36, 51-53, 86, 115-117.
Ishikawa Seiji
Kawazoe Toshihiro
Murakami Yuichi
Oka Toshimitsu
Sekine Chogo
Aisin Seiki Kabushiki Kaisha
Cangialosi Salvatore
Japan Radio Co. Ltd.
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