跨距离门目标的回波积累检测是雷达系统性能的重要指标之一。文中首先分析了运动目标的回波模型,并利用时 频方法,完成目标在距离门内的相参积累,然后距离门间通过时频图的二值化处理,利用时频二值图的线性映射实现非相 参积累,实现跨距离门目标的积累检测。该方法不仅避免了传统分段检测方法的距离包络对齐问题,也不受多普勒速度 模糊的影响,对目标回波信噪比要求较低,具有一定的工程价值。最后利用仿真验证了该方法的有效性,实现了跨距离门 目标的有效积累和检测。

The detection ability of range migration target is a key factor related to radar system. Based on time-frequency analysis method, coherent integration in range-gate is realized first in this paper, and then combined to binary time-frequency images, a range-migration target detection method is proposed. This method can not only avoid envelope compensation and Doppler ambiguity estimation, but also reduce SNR requirement. The simulation results show the efficiency of the method.