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m序列相位编码信号最小峰值旁瓣滤波器(LP滤波器)的冲激响应序列可以通过解线性规划问题求得。对于15位和31位全部m序列的计算结果表明,LP滤波器对峰值旁瓣有较大的抑制。对[4,3,0]反馈连接的起始状态为1001的15位码,它的长度为15的LP滤波器的峰值旁瓣电平降到—21.47dB,比用匹配滤波器改善7.49dB;对[5,3,2,1,0]反馈连接的起始状态为11101的31位码,它的长度为31的LP滤波器的峰值旁瓣电平降到—23.80dB,比用匹配滤波器改善6.01dB。当滤波器的长度增加时,LP滤波器可把峰值旁瓣抑制到更低电平。
The impulse response sequence of the min-peak sidelobe filter (LP filter) for the m-sequence phase-coded signal can be found by solving the linear programming problem. For the 15th and 31th bit all m sequences, the results show that the LP filter has a greater suppression of the peak sidelobes. For the 15-bit code with a starting state of 1001 for [4,3,0] feedback connections, the peak side-lobe level of the LP filter of length 15 is reduced to -21.47 dB, which is 7.49 dB better than the matched filter ; For the 31-bit code whose starting state of [5,3,2,1,0] feedback connection is 11101, the LP sidelobe level of LP filter whose length is 31 is reduced to -23.80dB, Filter to improve 6.01dB. When the length of the filter increases, the LP filter can suppress the peak sidelobes to a lower level.