Receiving device for receiving and demodulating spread spectrum-modulated GPS wave
June 27, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesDigital global positioning system receiver Digital signal processor and processing method for GPS receivers Method and system for determining position on a moving platform, such as a ship, using signals from GPS satellites Frequency diversity receiving system based on cancellation of C/A code in GPS Global positioning system receiver digital processing technique GPS system and method for deriving pointing or attitude from a single GPS receiver Global positioning system receiver digital processing technique Satellite radionavigation receiver System and method for a digital navigation satellite receiver Patent #: 5347284 InventorAssigneeApplicationNo. 266253 filed on 06/27/1994US Classes:375/137, Having specific code acquisition or tracking342/352, Including a satellite342/357.12, GPS receiver signal processing375/149, Having specific code synchronization375/150, Correlation-type receiver375/327, Phase locked loop375/329, Phase shift keying380/34Plural carrier frequenciesExaminersPrimary: Gregory, Bernarr E.Attorney, Agent or FirmInternational ClassesH04L 027/30G01S 005/02 H04B 007/185 Foreign Application Priority Data1993-06-28 JPAbstractA receiving device for receiving spread spectrum-modulated GPS signal transmitted from GPS (Global Positioning System) satellites to the earth. Received GPS signals are converted into IF signals which are despread-demodulated on the basis of C/A codes, resulting in demodulated PSK signals. Carriers are reproduced from the IF signals and a clock signal for C/A code generator is produced from the reproduced carrier and a local oscillation signal. The PSK signal is demodulated on the basis of a reference frequency of a PLL circuit to obtain a navigation message.Other References
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