一种基于空域滤波的米波雷达测高新方法

Novel Height Finding Technique Based on Spatial Filtering in Meter-wave Radar

针对米波雷达波束宽、易受阵地反射多径影响的问题,提出一种基于空域滤波的米波雷达低仰角测高新方法。首先该方法形成指向偏离搜索仰角的空域滤波器,并在搜索仰角及对应的多径反射角处形成两个零陷以对消目标直达回波和多径反射回波。然后,对阵列信号进行滤波,通过滤波后信号能量最小值的角度信息估计目标仰角和高度。与传统的高分辨算法相比,该方法对平坦及粗糙反射面均具有适应性,具有低运算复杂度和高测量精度。最后,计算机仿真和实测数据的处理结果验证了该算法可行有效。

A novel height finding method based on spatial filtering for meter-wave radar is proposed to overcome the height finding problem due to wide beam and reflection multipath. In each elevation angle search,a spatial filter is formed with beam pointing deviating from the search angle. Two nulls of spatial filter in the search angle and its corresponding specular angle are constructed respectively to cancel the direct and the multipath echoes. The elevation angle and height of target can be estimated by finding the search angle which corresponds to the minimum value of the filtering result of the received array signal. The proposed method is adaptive to both smooth and rough reflection,and could give much more precision in height finding compared with traditional superresolution methods. Simulations and real data processing results are presented to verify the effectiveness of the method.