一种迭代加权最小二乘旁瓣抑制滤波器设计

Design of An IRSL Sidelobe Suppression Filter

二相码信号是一类常见的脉冲编码信号,但码较短时,匹配滤波的主副比不高,需要采用旁瓣抑制技术。通过迭代加权最小二乘算法对旁瓣抑制滤波器的最小二乘解进行优化,选择合适的终止条件,只需几步就能达到最优解。分析该算法应用于m序列需要满足的条件,及PSL、ISL与滤波器长度的关系,并给出计算机仿真结果。

Biphase codes are common pulse compression waveforms. For short biphase codes, the main lobe to sidelobe ratio of pulse compression is low, so sidelobe suppression is necessary. The least square （LS） solution of the sidelobe suppression filter is optimized by iterative weighted LS method in this paper. Optimized solution is quickly obtained by choosing reasonable ending conditions. The requirements that this algorithm should meet when used to m-sequences and the relationships of PSL and ISL with the length of the filter are also analyzed. Some simulation results are shown at the end.