旋转目标距离像长度特性及微运动特征提取

The Characteristic of Range Profile and Micro-Motion Feature Extraction for Rotary Target

本文提出了利用旋转目标高分辨一维距离像的长度变化特性提取目标旋转半径和旋转速度等微运动特征的新方法.重点分析了旋转目标一维距离像的长度特性,指出当目标旋转时,微运动造成的一维像"虚假"长度和目标真实长度在雷达视线上的投影共同构成了目标的一维距离像.当目标匀速转动时,其一维距离像的长度变化服从正弦绝对值曲线,并根据这种变化特性,提出了两种提取旋转目标微运动特征的新方法.最后,设计了外场试验,通过实测数据证明了本文的观点和特征提取方法的有效性.

For rotary target,the method for extracting micro-motion feature by using the length of range profile is studied. Vastly, the characteristic of range profile for rotary target is analyzed. The length of range profile can be separated into two parts. One is the radial length of the target, and the other is the illusive length which is produced by rotation. Then, while target is rotating with a constant angular velocity, the length of range profile obeys the absolute value of sinusoid. The radius and the angular velocity can be estimated by using this variety of length.Finally,tbe results of feature extraction by utilizing the measured data practically in field are shown in figures, which validate the ideas.