Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1997-11-24
2000-04-25
Chin, Stephen
Pulse or digital communications
Spread spectrum
Direct sequence
375142, 375367, H04K 100
Patent
active
060552654
ABSTRACT:
GPS satellite signals are received, and a C/A code is synchronized by utilizing the non-coherent DLL so as to remove the unique code of the GPS satellite. There are generated 1/2-bit lagging, 1/2-bit leading and normal satellite codes. Then a correlation between the former and a down-converted intermediate frequency signals is carried out. Mixers mix the correlated three different phase signals with signals of a local oscillator. The output signals of the mixers are filtered by a band filter, and envelopes are detected from the filtered signals by an envelope detecting section. The detected envelopes are subtracted from each other. The output signals of the subtractor are filtered by a loop filter, and the filtered signals are controlled by a voltage control oscillator. The oscillated signals are inputted as clock signals into a satellite code generating section.
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Chin Stephen
Fan Chieh M.
Hyundai Electronics Ind. Co. Ltd.
Kurland, Esq. Lawrence G.
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