基于离散小波变换提高MTD检测性能的仿真分析

Simulation Analysis for MTD Detectability Improvement Using the Discrete Wavelet Transform (DWT)

ＭＴＤ雷达的多卜勒滤波器组由于加权处理而工作于失配状态，文献［１］介绍了一种利用离散小波变换（ＤＷＴ）补偿信噪比损失的方法，但这种方法仅在回波多卜勒频率与滤波器中心频率偏移比较大时方显出其优势。作者在文献［２］中提出了一种基于加权ＦＦＴ（ＷＦＦＴ）与ＦＦＴ—ＤＷＴ并行处理的新方法。本文则直接将ＷＦＦＴ与ＤＷＴ作串行链接，仿真结果表明，该方法在整个频率范围内具有最优的检测性能。

Radars usually work in unmatched state because Doppler filter banks in MTD are weigthed[1] introduces a discrete wavelet transform (DWT) based method to compensate the SNR loss. But it is effective only when the shift between the Doppler frenquency of echo and the central frequency of filter is larger. Authors present a Parallel Processing approach based on WFFT and FFT-DWT in reference [2]. This paper directly connects DWT to the WFFFT output in a series way, the results show that the highest detectability can be gotten in the whole frequency range by this new method.