一种改进的雷达低空目标仰角估计算法

由于地(海)面反射的多径镜像信号的存在,使雷达低空目标的仰角估计成了难题。而三子孔径算法是针对该难题而提出的一种有效算法。此算法基于极大似然算法将等距线阵均分为三个子孔径,从而简化了估计函数,也使计算量大大减少。本文在三子孔径算法的基础上,利用目标信号与镜像信号在入射角度上的正弦约束条件,给出了一种改进算法。计算机仿真结果显示改进算法在性能上要优于三子孔径算法。

The Improved Algorithm for Elevation Angle Estimates of Low Altitude Radar Target

Because of the presence of multipath signal reflected over a smooth ground (sea), it is difficult to estimate the elevation angle of a low - altitude radar target. However, the three subaperture algorithm is very efficient to deal with the problem. Base on the maximum likelihood algorithm, the algorithm divides an array into three subaperture and predigests the estimate function and reduces the compute quantity. In this paper, we propose an improved algorithm based on the three subaperture algorithm, which makes use of sine restrict condition between the arrival angle of the target signal and that of the mirrored signal. The computer simulation results show that the improved algorithm has better performance than the three subaperture algorithm.