一种数字脉压旁瓣抑制滤波器设计方法
A METHOD TO DESIGN DIGITAL PULSE COMPRESSION FILTERS FOR SIDELOBE SUPPRESSION
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摘要: 本文使用迭代加权最小二乘法设计脉冲压缩滤波器,适用于二相码和多相码,LFM和NLFM等各种信号。由于重新定义了目标函数和约束条件,本文方法较之常用的频域加窗法性能有很大提高。多普勒频移fd=0时,在保持4dB主瓣展宽系数为1,且压缩比较低、滤波器抽头数有限条件下,峰值旁瓣电平低于-40dB。
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关键词:
- 脉冲压缩; 旁瓣抑制; 最小二乘法
Abstract: This paper uses iteratively reweighted least square method to design pulse compression filters,which is applicable to biphase code:polyphase code,LPM and NLFM signals.As we redefine the object function and constraint condition, the performance of this method is superior to that of the conventional frequency domain weighted window method.When the Doppler frequency shift fd=0 and the coefficient of 4dB mainlobe width is kept to be 1 and the compression ratio is not high and the tap number of FIR filter is limited, the peak sidelobe level is less than -40dB. -
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