Beidou B1I signal acquisition algorithm based on PMF + double threshold Tong detection
Aiming at the problems of long detection time and high probability of missed alarm of traditional Tong detection algo-rithm,PMF+double threshold Tong detection algorithm is proposed to be applied to the acquisition of Beidou B1I signal.First,the IF signal processed by the RF front-end module is down converted to baseband,and the baseband signal is preprocessed such as speed re-duction;Then,the partial matched filter(PMF)algorithm is used to calculate the correlation value.The data signal is divided into sever-al equal segments by the PMF algorithm.The correlation value is calculated for each segment of the signal,and three groups of correla-tion results with the same phase will appear;Finally,the dual threshold Tong detection algorithm is used to detect the correlation re-sults calculated by the PMF algorithm to capture the B1I signal.The simulation results show that the algorithm can effectively improve the detection probability and reduce the detection time when capturing the Beidou B1I signal,and improve the speed of capturing the B1I signal.
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