弹道中段多目标微多普勒分离方法

针对窄带雷达获取的多目标回波中微多普勒信息相互交叠、难以分离与提取的问题,提出了一种基于拍卖算法和小波分析相结合的多目标微多普勒分离方法。在滑动散射模型的基础上,首先通过对回波信号进行预处理得到时频骨架,再根据弹道目标多普勒的变化规律及估计的进动周期定义路径长度,利用拍卖算法提取出多条多普勒曲线对应的最短路径,最后采用小波分析法消除多普勒曲线中的剩余平动分量,实现了多目标微多普勒的分离。仿真结果表明,该方法能够较好地解决交叉区域的路径选择问题,且抗噪性较好,适用于多种微动形式。

Micro-Doppler resolution of multi-ballistic targets in midcourse

To solve the problems of overlapping and difficult separation of micro-Doppler information of multi-ballistic target echo in narrow-band radar, a novel method based on auction algorithm and wavelet analysis is proposed to separate micro-Doppler of multi-ballistic targets. First, based on the sliding scattering model, the time-frequency skeleton is obtained by preprocessing. Then, the path length is defined by variation rules of Doppler and estimated precession period. The shortest paths corresponding to Doppler curves are extracted by auction algorithm. Finally, micro-Doppler resolution of multi-ballistic targets is realized after translational motion compensation by wavelet analysis. Simulation results indicate that the method can solve path selection problems well in intersection region, and is suitable for various forms of micro-motion.