基于空间重采样的宽带DOA估计新算法及其性能分析

首先介绍了宽带阵列信号模型,然后给出了一种基于空间重采样的新的宽带信号相干子空间处理算法。该算法将均匀线阵看成是连续线阵的离散采样,在各个频率点调整阵列空间采样率,将各频率分量的方向向量聚焦到参考频率上,聚焦后得到单一频率点的数据协方差矩阵,再应用窄带MUSIC算法进行DOA估计,无需预估计波达方向,因此可以避免角度预估计对测向性能的影响。仿真实验表明新算法的性能要优于其他典型算法(TCT,RSS和TLS算法)。文中还给出了分辨率与阵元个数、信噪比之间关系。

A New Method to Wideband DOA Estimating Based on Spatial Resampling and Its Performance Analysis

This paper introduces the model of wideband array signal processing,then it gives a new method to wideband DOA estimating which based on spatial resampling.This new method treats uniformly linear arrays as discrete sampling of continuous arrays and adjusts the rate of spatial sampling at different frequencies.Then the covariance matrix of single frequency is got by focusing signal subspace of different frequencies to the focused frequency,and the MUSIC method was used to estimate the direction of arrival.This new method does not need preliminary angel estimating,so it can avoid the impact of preliminary angel estimating of performance of DOA.Simulation results verify great performance of this new method by comparing it with other classical method(such as TCT method,RSS method and TLS method).