进动弹道目标平动补偿与分离

弹道目标在中段高速运动时会造成微多普勒曲线的叠加折叠，此时传统的平动补偿方法并不适用于弹道目标。在分析进动锥体弹道目标各个散射点的频率特性后，发现曲线交点处的频率完全是由平动引起的。根据这一特性，提出一种利用时频图交点信息进行平动补偿的方法。首先，得到回波信号的时频骨架图；然后，采用基于双边滤波器的Harris角点检测方法提取出时频骨架中的角点进而得到时频图中的交点坐标；最后，利用交点坐标估计出平动参数进行平动补偿。针对传统Viterbi算法在曲线交点容易产生错误关联的问题，提出一种利用交点信息的分段Viterbi算法对补偿后的时频曲线进行分离。仿真实验验证了所提方法的有效性。 

Translation compensation and resolution of ballistic target with precession

The ballistic target will cause superposition and folding of the micro-Doppler curve when moving in the midcourse at high speed, the traditional translation compensation method is not suitable for ballistic target translation compensation. After analyzing the frequency characteristics of each scattering point at the precession, it is found that the frequency at the intersection of the curves is completely caused by the translation. According to this property, a method of using the time-frequency image intersection information to perform translation compensation is proposed. First, the time-frequency skeleton image of the echo signal is obtained, then the Harris corner detection method based on bilateral filter is used to extract the corner points in skeleton and the intersection coordinates in the time-frequency image are obtained. Finally, the coordinates of intersection points are used to estimate the translation parameters for translation compensation. For the problem that the traditional Viterbi algorithm is easy to generate false correlations at the intersection of curves, a segmentation Viterbi algorithm using intersection information is proposed to separate the compensated time-frequency curves. Simulation experiments verify the effectiveness of the proposed method.