摘要
提出一种具有低信噪比损失的旁瓣抑制滤波器设计方法。常规的旁瓣抑制滤波器通常以峰值旁瓣最低为设计目标,未考虑信噪比损失的控制。本设计先给出了滤波器信噪比损失的表达式,在设计目标函数时考虑了信噪比损失,按加权失配滤波法得到显式的滤波器系数迭代关系式。该方法适用于二相码、多相码、LFM信号和NLFM信号。对于LFM信号,在信噪比损失相同(均为1.4 dB)的情况下,本方法所得滤波器较之常规的频域加窗法,峰值旁瓣低5 dB以上;而在峰值旁瓣电平相近的情况下,信噪比损失只有1 dB。
A side-lobe suppression filter with low loss of signal-noise ratio is proposed. Normal side-lobe suppression filter is usually designed only to reduce the output side-lobe as low as possible, and the loss of signal- noise ratio is not specially considered. The expression of filter＇ s loss of signal-noise ratio is presented firstly. Considering the signal-noise ratio, a method of using weighted mismatched filter iteratively to radar waveform such as binary code, multiple phase code, linear frequency modulated signal and non linear frequency modula- ted signal is explicitly proposed. As to LFM signal, with the same loss of signal-noise ratio, the peak side-lobe level of the proposed filter output is 5 dB lower than that of frequency hamming weighting method.
出处
《测控技术》
CSCD
北大核心
2009年第8期21-24,共4页
Measurement & Control Technology
关键词
旁瓣抑制
信噪比损失
加权失配滤波器
side-lobe suppression
loss of signal-noise ratio
weighted mismatched filter
