METHOD AND APPARATUS FOR DETECTING CROSS CORRELATION BASED IN LIMITED RANGE CODE PHASE OFFSET OBSERVATIONS

摘要

Apparatus and a method identify and eliminate false satellite signals that are cross correlation signals without prior knowledge of any possibly interfering strong satellite signals. The disclosed method analyzes a small number of code phase offsets relative to a threshold value based on the detected peak of a weak satellite signal to determine if the weak satellite signal is not a true satellite autocorrelation signal but a cross-correlation signal. The number of code phase offsets and the threshold value may be determined based on the signal-to-noise ratio of the detected weak satellite signal.