利用雷达回波的双谱特征进行目标识别

雷达目标的散射特征可用它的脉冲响应来表示,且通常散射存在的位置与散射产生的时间之间是一一对应的。但当目标比较复杂时,目标的脉冲响应中不仅有镜面散射产生的回波,还有多个散射相互作用产生的回波(即多径效应),这两种回波用我们通常的频谱、功率谱是无法区别的,但用双谱却能将它们加以区别,因而双谱能揭露隐藏在目标回波中的某些特征,利用这些特征可实现目标识别。本文研究了双谱特征的提取以及利用双谱特征进行目标识别的问题,并对实测的四种地面目标进行了识别实验,得到了较好的识别结果,从而证明了利用雷达回波的双谱特征进行目标识别是可行的。这也是利用目标回波的高阶谱进行特征提取和实现目标识别想法的一次尝试。

RECOGNITION OF RADAR TARGET USING THE BISPECTRUM

The scattering characteristics of radar target can be represented by its pulse response, usually the location of scattering centers are corresponding to the time in which the scattering-are existing. In the case of complex targets, not only the mirror scattering returns but also the multiscattering interacting returns (multipath effction) arc included in the target returns. Although chese rwo returns cann't be distinguished by classic frequency and power spectrum, they are difference in bispectrum. So some features hidden in the target returns can be recovered by the bispectrum, and can be used to carry out the target recognition. The problem of feature extraction and the target idenuficanon of bispectrum are studide in die article. Recognition experiments are doned to the real tested data and the results are good It proves that it is reasonable to take advantage of bispectrum to realize the identification of radar targets. It is also a try of using high order spectrum in radar target features extraction and target identification.