径向运动对频率步进雷达目标距离像影响的新理解

New Understanding of the Radial Motion Influence on Target' s Range Profiles for Stepped-Frequency Radar

在对运动目标距离像相位调制因子的物理意义深入理解的基础上,利用驻定相位原理得到了运动目标距离像的峰值位置和目标初始位置、速度、加速度的解析关系;对径向运动引起的二次相位干扰项、三次相位干扰项对距离像的影响给出了更准确的理解,详细给出了各调制项对应的偏移量和展宽量的理论表达式;通过分离各相位调制项的方法,实验验证了理论推导的正确性。该分析结果有助于理解运动目标距离像变化的真正原因,进而有助于针对不同的情况进行相应的后续处理。

Based on the good understanding of the physical meanings of the moving target＇ s range profiles＇ phase modulation factors, the analytic relationship between the peak position of the moving target＇ s range profile and the initial position, velocity and acceleration are obtained using stationary phase principle. The radial motion＇ s influence of quadratic phase factors and cubic phase factor on range profiles are considered in an accurate way. The theoretical expressions of the offsets and spreading amount of each phase modulation items are derived. Through isolating the phase modulation items, the theoretical derivations are verified by the simulation experiments. The research results are useful to understand the true reasons for the moving target＇ s range profile change, and then useful for the corresponding subsequent processing.