Code Acquisition Technique of DS/SS with Large Frequency Offset
For code acquisition of DSSS in condition of large frequency offset,common technology is to insert the pilot channel signal into the DS/SS signal.The receiver processes the pilot channel signal and estimates carrier frequency offset,compensating fading of pn-code correlation value resulted by frequency offset.The systems employing the technology include the "Global Star" mobile satellite communication system.But,the technology doesn't adapt to modern military communication according to its request for low probability of intercept and detect communication.For this question,the article introduces a new pn-code acquisition technology called "serial-parallel correlator with FFT".FFT is used to compensating the decline of pn-code correlation value created by frequency offset.And we more deeply and perfectly analyze the principle of code acquisition system,and research it's performance in AWGN channel environment.