中文摘要：

在详细分析频率步进雷达旋转微动点目标回波特征和一维距离像特点后,利用不同帧之间构成的慢时间一维距离像组的相关性,合成得到时间-距离像.对比分析了旋转微动目标的径向距离和距离像位置的变化规律,进而提出了一种基于频率步进雷达时间-距离像的宽带旋转微动特征提取的新方法,给出了旋转中心、旋转半径以及角速度等微动参数的理论表达式,推导得出算法的理论精度.设计并成功开展了地基毫米波频率步进雷达对称旋转目标的外场试验,验证了方法的有效性和精确性.该特征提取思想可扩展应用于振动、滚动等其他形式的微动特征提取,推广应用于线性调频信号的高分辨体制雷达系统.

英文摘要：

The echo of stepped-frequency pulse series for the point target with rotation, as well as the micro-motion＇ s influence on one-dimensional range profile, is analyzed in detail. The time-range profile can be synthesized by utilizing slow-time comelations between frames. The varying laws of the range for the rotary point target and the target position in range profiles are contrastively analyzed.Based on this time-range profile, a novel feature extraction method of wideband micro motions is presented, and the theoretical expressions of micro-motion parameters, such as rotation center,rotation radius and angle velocity,are given. The theoretical precision of the micro-motion feature extraction method is deduced. Finally, to verify the results,the outfield experiments of two reflectors with symmetrical rotations are successfully designed and operated for the ground-based millimeter steppedfrequency radar. The idea can be extended to the feature extraction of multiple kinds of motions for stepped-fiequency radar,such as vibration and tumbling,and can be adopted in other high resolution radar systems with linear frequency modulation signals.