Patent ID: 8457177
Filing Date: 2013-06-04
Classification: G01S,H04B

Abstract:
1. A method for detecting code phase in a GPS signal, comprising: collecting a multiple millisecond portion of a GPS signal in a GPS receiver; partitioning the multiple millisecond portion of the GPS signal into a plurality of one millisecond segments; converting each of the one millisecond segments to the frequency domain; multiplying each of the converted one millisecond segments by a frequency domain representation of a Gold code corresponding to a GPS satellite to generate a plurality of products; converting each of the plurality of products to the time domain to obtain convolution signals between each one millisecond segment and the Gold code; and combining said convolution signals to determine a correlation peak that is reflective of a code phase of the GPS signal, wherein at least one of said convolution signals has been multiplied by a complex exponential to compensate for a frequency difference between an input signal and an estimated carrier frequency.