一种基于线性预处理的米波雷达低仰角处理算法

由于多径效应的存在,使得米波雷达在低仰角时接收到的回波是两组相干信号,即直达信号和反射信号的矢量叠加.本文提出了一种米波雷达在低仰角情况下DOA(波达方向估计)的新方法,先对实测数据进行线性变换,然后对线性变换后的数据和实测数据的差分结果应用角度超分辨算法,实现米波雷达低仰角的波达方向估计.算法对信号所处环境不敏感,可以有效地克服多径效应.理论分析和计算机仿真都表明新算法的优越性.

An Algorithm Based on Linear Preprocessing for Meter-Wave Radars to a Target at Low Altitude

The echoes of meter-wave radar received are coherent signals consisted of direct and reflected signals due to the multipath effect at low elevation angles.A new method that can estimate the DOA(direction-of-arrival) of a target under low-angle condition is presented in this paper.Linear transform is applied to measured data firstly.Difference operation is performed to measured data and transformed data secondly.Finally applying super-resolution algorithm to the result from step two,we can obtain the DOA of a target for meter-wave radar at low altitude.This method is not sensitive to the signals environments and can overcome multipath effect effectively.Theoretical analysis and simulation results demonstrate the merits of the new algorithm.