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Method and apparatus for performing signal correlation

  • US 7,190,712 B2
  • Filed: 03/21/2003
  • Issued: 03/13/2007
  • Est. Priority Date: 05/18/2001
  • Status: Expired due to Term
First Claim
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1. A receiver of global positioning system (GPS) signals, comprising:

  • an RF/IF converter for filtering and frequency translating received GPS signals having a repeating code to form an IF signal;

    a tuner for producing an in-phase (I) signal and a quadrature (Q) signal;

    a convolution processor for multiplying portions of a C/A reference code with portions of the repeating code of the I and Q signals to produce a plurality of I and Q inner products;

    a first accumulator for accumulating the I inner products over a period less than a period of the repeating code to produce an I correlation;

    a second accumulator for accumulating the Q inner products over a period less than a period of the repeating code to produce a Q correlation; and

    a signal normalizer for generating normalizer values representative of magnitude or power or the I correlation and the Q correlation.

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