SAW 15位m序列相位编码信号的最小峰值旁瓣滤波器

本文介绍用线性规划方法求解[4,3,0]反馈连接的、起始状态为1001的15位m序列相位编码信号的最小峰值旁瓣滤波器(LP滤波器)的计算结果。长度为15的LP滤波器的峰值旁瓣电平降到－21.47dB,比匹配滤波器改善7.49dB,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。并介绍用声表面波(SAW)技术制作15位m序列相位编码信号(起始状态为1001)的LP滤波器,实验结果,其峰值旁瓣电平为－19dB,与理论值相差2.47dB。

SAW MINIMUM PEAK SIDELOBE FILTER FOR 15bit m-SEQUENCE PHASE CODED WAVEFORM

This paper presents the computation results of the minimum peak sidelobe filter (LP filter) for the 15bit m-sequence phase coded waveform with feedback connection [4, 3, 0] and initial condition 1001. The design of the filter resorts to linear programming method. The peak sidelobe level of LP filter of length 15 is reduced to -21.47 dB, and is 7.49 dB lower than that of matched filter. The LP filter can suppress the peak sidelobe even more as increasing its length. The minimum peak sidelobe filter for 15 bit m-sequence phase coded waveform (initial condition 1001) has been implemented with surface acoustic wave (SAW) device. Experiments show that the peak sidelobe level of the manufactured filter is -19dB and thus differs from the theoretical value (-21.47 dB) by 2.47 dB.