Radar Target Detecting And Implemention Based On Biphase Coded Signal

The signal with great timewidth and bandwidth product can get great detective range, measure precision. As a kind of the signal with great timewidth and bandwidth product, phase codes radar has good anti-hiding characteristic, anti-jamming capability, low probability of intercept property. However, phase codes have the disadvantages of higher range sidelobe when compressed and doppler frequency sensitivity.The sidelobe suppression, doppler compensation algorithms and radar signal processing system implemented on TS201 are emphasized on in this paper.In this paper, ambiguity function are introduced and the basic characteristics of biphase coded signal are analyzed at first. Two classical biphase coded signals, Barker code and m sequence code, are also introduced. After that, a sidelobe suppression algorithm - optimal PSL mismatched filtering algorithm - is discussed in order to get lower sidelobe. Then two doppler compensation algorithms are studied, including the multi-branch doppler compensation algorithm and the doppler compensation algorithm based on alternant m sequence code, and the corresponding simulations and comparison are given. Finally, the implement of a radar signal processing system is introduced.The comparison and analysis of the processing results of DSP and MATLAB are drawn, which illustrates the effectivity and efficiency of these algorithms in projects.