Study on Effect of Notch Filters in Pseudo Code Tracking Loop and Corresponding Improvement Methods
Bing Wang · Journal of Astronautics · 2010
Notch filters are widely used in direct spread spectrum systems to resist interferences within the working band. The effect of the notch filters in pseudo code tracking loop was analyzed in this paper. To resolve the spread signal distortion and time delay problem,the local PN code was notch-filtered to increase the correlation between receiving signal and the local pseudo code. At the same time,to decrease the big fluctuating integral energy,the integral time was extended. Simulations were carried out in systemvue 2006 environment and the results showed the efficiency of the two proposed methods.