Modified Sliding Correlate Algorithm of Beidou B1 Signal
Wenxu Zhang, Yatong Wu, Zhen Hai Dou, Jianbo Hu · 2016
The intermediate-frequency signal changes from BeiDou signal can get original signal of acquisition and tracking after analog to digital conversion. Sliding correlate algorithms, matched filter algorithm and circular convolution algorithm based on FFT are three of the most widely used acquisition algorithm at present. This article introduce the three algorithm and analyze their advantages and disadvantages. Among them, sliding correlate algorithm has simple structure and it's easy to achieve. But it takes more time to capture BeiDou B1 signal. Modified sliding correlation algorithm is presented base on the analysis of the structure of BeiDou B1 signal and traditional sliding correlation algorithm. New algorithm has simple structure as well. The speed of acquisition is increased. Simulation of modified sliding correlate algorithm indicate the speed of modified algorithm is more ideal.