Patent ID: 6762714
Filing Date: 2004-07-13
Classification: G01S

Abstract:
A method of making dual-band GPS measurements, comprising the steps of:coherently coupling a continuously tracking C/A code carrier phase tracking GPS component to a L1 and L2 band sampling component and a digital signal processing component, causing said sampling component to generate L1 and L2 quadrature samples of the GPS signal, collecting a selection of data over a specified interval for processing; using tracking parameters from the C/A code and carrier tracking over said specified interval to synthesize feedforward P code and carrier sequences for each of the L1 and L2 channels, mixing said L1 feedforward P code and carrier sequence with said quadrature L1 samples and filtering said L1 feedforward P code and carrier sequence mixed with said quadrature L1 samples to form a baseband, intermediate, quasi-static sequence, and mixing said baseband, intermediate, quasi-static sequence from said L1 channel with the samples from said L2 channel and filtering said mixed baseband, intermediate, quasi-static seguence from L1 with samples from said L2 channel to form a baseband quasi-static output whose phase is a measurement of the difference between said L1 and L2 quadrature components of the GPS signal.