A Novel GPS Cross-Correlation Mitigation Algorithm Based on Code Phase Comparison

The cross-correlation problems occur in any instance in which weak GPS signals need to be acquired and tracked in the presence of other strong GPS signals. The influence of cross-correlation must be considered in the design of high-sensitivity acquisition method. In this paper, a new detection method is presented based on multiple times acquisition and code phase comparison (CPC). One group of code phases is obtained after one acquisition and the code phases of the maximum several peaks are selected and stored in an array. After multiple times acquisition, multiple groups of code phase are obtained. We can find whether the code phase of autocorrelation appears according to the comparison method presented in this paper. The CPC algorithm need not reconfigure the strong PRN signal and has relative higher acquisition sensitivity in the presence of cross-correlation interference. The experimental results show that the CPC method can effectively find autocorrelation peak of weak signal with-147 dBm power level, in presence of one strong signal with-124 dBm power level.