多径BOC信号捕获性能分析

针对多径情况下存在一阶多普勒变化率的高动态二进制偏移载波(Binary Offset Carrier,BOC)信号捕获困难的问题,本文提出了基于部分匹配滤波器(Partial Matched Filter,PMF)和分数阶傅里叶变换(Fractional Fou-rier Transform,FRFT)相结合的多径情况...

Performance Analysis of Multipath BOC Signal Capture

In order to solve the problem of difficult acquisition of high dynamic binary offset carrier (BOC) signal with first-order Doppler rate in multipath environment, this paper proposes a method based on partial matched filter (PMF) and fractional Fourier transform (FRFT) The acquisition algorithm of high dynamic BOC Signal in multipath environment is proposed. Firstly, the partial matched filter is used to process the signal by segments. Then, the direct signal is determined by using the characteristic of fractional Fourier transform that makes different LFM signals present energy aggregation in different fractional Fourier transform domains. Finally, BOC signal is captured in the optimal fractional Fourier transform domain corresponding to the direct arrival signal. The algorithm can determine the direct signal and suppress the multipath signal except the direct signal. The simulation results show that the algorithm can achieve the acquisition of multipath BOC Signal with first-order Doppler change rate when the signal-to-noise ratio is - 7dB.