单频涡旋电磁波雷达旋转目标微动参数提取方法

A Method for Micro-motion Parameters Extraction of Rotating Targets Based on Single-frequency Vortex Electromagnetic Wave Radar

与传统平面电磁波雷达相比,涡旋电磁波雷达回波中蕴含更多的目标微动信息,综合利用线多普勒效应和角多普勒效应可获得更为准确的目标微动参数。现有线多普勒信号和角多普勒信号分离方法大多利用图像域方法对时频图像进行处理,此类方法的性能受限于时频分辨率,且需解决复杂的时频曲线分离问题。为解决上述问题,提出了一种能够适用于角多普勒较小、旋转中心未知场景下的角多普勒信号分离方法。首先分析了单频涡旋电磁波雷达中旋转目标的多普勒效应;然后利用线多普勒获得旋转目标的径向微动参数,构造参考信号补偿涡旋电磁回波,利用滤波方法获得了较为纯净的角多普勒信号;最后基于压缩感知算法和旋转目标角多普勒的性质,准确获得了旋转目标的各项微动参数。仿真验证了所提方法的正确性和鲁棒性,并分析了所提方法的性能。

Compared with the traditional plane wave radar,the vortex electromagnetic wave radar echo contains more target micro-motion information.More accurate target micro-motion parameters can be obtained by comprehensive use of linear Dop⁃pler effect and angular Doppler effect.At present,the separation methods of linear Doppler signal and angular Doppler signal mostly use the image domain method to process the time-frequency image.However,the performance of these methods is lim⁃ited by the time-frequency resolution,and the complex time-frequency curve separation problem needs to be solved.In order to solve the above problems,an angular Doppler signal separation method applied to the scene with small angular Doppler and unknown rotation center is proposed.Firstly,the Doppler effect of rotating target in single-frequency vortex electromag⁃netic wave radar is analyzed.Then the linear Doppler is used to obtain the radial micro-motion parameters of the rotating target,the reference signal is constructed to compensate the vortex electromagnetic echo,and the relatively pure angular Dop⁃pler is obtained by the filtering method.Finally,based on the compressed sensing algorithm and the property of angular Dop⁃pler of rotating target,the comprehensive micro-motion parameters of rotating target are obtained.The correctness and robust⁃ness of the proposed method are verified by simulations,and the performance of the proposed method is also analyzed.