高速目标距离、多普勒走动及其补偿方法

Range/Doppler migration and compensation methods for hypersonic targets

临近空间飞行器的出现对现役雷达系统提出了严峻挑战,其高超声速特点导致的跨距离单元、跨多普勒单元现象使雷达系统常用的相参积累处理失效,必须通过对目标回波信号进行速度、加速度补偿才能实现有效的积累。本文首先分析了临近空间目标的运动特性,及其导致距离、多普勒走动的原因,然后提出了通过Keystone变换以及加速度补偿处理的方法,并对工程实现中面临的问题进行了分析,最后通过仿真验证了算法的可行性。

The advent of near space aircraft brings challenges to the radar systems in service. The hypersonic characteristics of near space targets result in the phenomena of range/Doppler cell migration, which make the coherent accumulation processing abnormal. Therefore, it is necessary that velocity and acceleration compensation should be made for the echo signals to realize effective accumulation. Firstly, the motion characteristics of near space targets and the reasons that lead to range/ Doppler migration are analyzed. Secondly, the problems faced in the engineering implementation are also analyzed through the Keystone transform and the acceleration compensation. Finally, the algorithm is verified to be feasible through the simulation.