An Adaptive Technique for the Mitigation of GPS Cross-Correlation

GPS is a CDMA system using DSSS, and the length of the C/A cod used by GPS L1 band civil signal is 1023chips. As the Cross-Correlation peak between the C/A codes is not zero, it will degrade the performance of the detection probability. Detection of weak signal is becoming important in many applications like GPS remote sensing etc. Cross-Correlation caused by GPS Gold codes are representing significant problem in the observation of weak GPS signals. Measurement performance for high precision applications can significantly degrade by cross correlation properties of GPS. Sub-space projection techniques represent one of the numbers of different approaches that are available for cross-correlation mitigation, although these techniques have traditionally not been used due to computational complexity. An alternative technique to the use of full sub-space projection is a sub-optimal approach i. e. , otherwise based on the same principle, by the use of non-standard de-spreading codes that are not matched to weak signal spreading code but instead are modified to be orthogonal to each other strong signal spreading codes that are present at the time of observation of GPS signals. One such technique here we have is called Adaptive Modeling of Local-Code Replica.