基于时间-距离像分布的锥体目标进动与结构特征提取

摘要

多特征综合利用是弹道目标识别的发展趋势.现有研究报道中,弹头进动特征提取通常假设某些结构特征已知,而结构特征提取通常又需要已知某些进动特征,这一学术僵局目前尚未有效突破.论文以旋转对称锥形弹头为研究对象,详细分析了各散射中心1维距离像位置与参考相位中心距离变化规律,基于时间-距离像分布,结合散射中心运动规律和几何关系,实现了进动特征(进动频率、进动角、初始相位角以及视线角)和结构特征(锥体高度、底面半径、质心到底面的距离)的联合提取,同时还估计出了质心与雷达的距离,仿真结果证明了算法的有效性和适应性.%Utilizing multi-feature for ballistic target recognition is a trend in the ballistic missile defense field. In the published literatures, the structure feature extraction of ballistic targets need know some precession parameters, while the precession feature extraction need know some structure parameters, which makes a deadlock in the feature extraction of ballistic targets. Firstly, this paper analyzes the trace of each scatter in the time-High Range Resolution Profile (HRRP) distribution of the cone-shaped warhead in detail. Then, based on the time-HRRP distribution and combining the trace and geometry relation of each scatter, the precession feature, including the precession frequency, precession angle, initial phase angle and the angle between the precession axis and the Line Of Sight (LOS), and the structure feature, including the target height, radius of the undersurface, distance between the centroid and undersurface, and the distance between the centroid and radar, are extracted jointly. Finally, the simulation results are given for validating the proposed algorithms.