一种基于降维处理的DOA估计方法

A DOA Estimation Method Based on Dimensionality Reduction Processing

针对传统波束形成算法在利用矩形面阵进行二维DOA估计时,需要进行二维角度遍历搜索,耗时较长等问题,通过理论推导和数值计算给出一种降维方法。该方法利用坐标转换及二次寻优,先后计算目标相对于x和y轴的夹角,并结合最小二乘思想最终计算出目标的方位角和俯仰角,将二维问题变为一维搜索,大大减小了计算量。仿真结果表明,该方法的角度估计精度与传统的MUSIC方法相.当,但其计算复杂度和计算时间节省了很多,非常适合工程应用。

Aiming at the problems of traditional beamforming algorithms that require a two-dimensional an-gle search for two-dimensional DOA estimation using rectangular arrays,which takes a long time,this paper provides a dimensionality reduction method through theoretical derivation and numerical calculation.This method uses coordinate conversion and secondary optimization,successively calculates the angle of the target relative to the X and Y axes,and combines the idea of least squares to finally calculate the azimuth and eleva-tion angle of the target,turning the two-dimensional problem into a one-dimensional search,which greatly reduces the amount of calculation.The simulation results show that the angle estimation accuracy of this method is equivalent to that of the traditional MUSIC method,but its algorithm complexity and calculation time are reduced a lot,which is very suitable for engineering applications.