专利名称：Systems and methods for extracting
coherent correlation data
发明人：Robert J. Van Wechel,Michael F. McKenney申请号：US10651895申请日：20030829公开号：US07185038B2公开日：20070227
专利附图：
摘要：An apparatus and method allow receivers to quickly acquire a pseudorandomnoise signal. A receiver advantageously detects frequency shifts using a compact parallelprocess hardware implementation of a Discrete Fourier Transform (DFT). The
simultaneous detection of multiple frequencies allows the receiver to search thefrequency range of the transmitted signal in larger increments of frequency, therebyincreasing the speed of acquisition. One receiver does not use coherent integrationbefore computation of the transform and advantageously maintains a flat frequencyresponse. The flat frequency response of the DFT circuit enables searching of multiplefrequency offsets without CPU intensive processing to compensate for frequencyresponse variations. A receiver can include a Doppler correction circuit, which permitscorrelation data with frequency shift in the code to be non-coherently integrated amongrelatively fewer addresses or tap positions in memory.
申请人：Robert J. Van Wechel,Michael F. McKenney
地址：Yorba Linda CA US,Anaheim CA US
国籍：US,US
代理机构：Knobbe Martens Olson & Bear LLP
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