微弱目标检测技术

高速弱小目标的检测是一个具有挑战性的课题。高速运动目标速度快，会产生严重的距离走动，而且由于雷达的脉冲重复频率较低往往导致欠采样。因此传统的 Keystone 变换失效， 这些都对目标能量的有效积累不利；同时由于各个目标的距离走动率不同，也不利于多目标的检测。针对以上问题提出一种基于 Clean 技术的微弱目标检测方法。校正目标的距离走动和二次相位项，从而实现目标能量的有效积累；同时利用 Clean 技术，提高了对微弱目标的检测性能。

Detection Technique for Weak Target

It is a challenging problem for the detection of high-speed target with small reflectivity. A serious range walk will result from high-speed targets; the low pulse repetition frequency will also lead to cross-range undersampling. Failure to the conventional Keystone transform will not contribute to the effective accumulation of target energy. And the different range walk ratio will affect multi-target detection. A method of the detection for weak targets based on Clean technique is presented to correct the range walk and the quadratic phase term, thereby achieving the effective accumulation of target energy. Clean technique is also used to improve the detection of weak targets.