基于粒子滤波的宽带信号波达方向估计

摘要

利用粒子滤波对不同频率点处的目标阵列流形进行跟踪,实现宽带信号波达方向估计.该算法基于当前时刻的观测信息,无需估计观测协方差矩阵,使得在短数据情况下仍能够取得优良的估计性能.同时算法从一组随机的初始值出发,无需预估计波达方向,并且递推过程是基于极大似然估计的思想,具有解相关的能力.计算机仿真验证了算法在短数据、低信噪比和相干源情况下具有比相干信号子空间法(CSM)算法更为优良的估计性能.%This paper proposes a new methodforestimatingthedirection-of-arrival (DOA) of wideband signal, which em ploys particle filters to track array manifold at different frequency bands. Compared with the coherent signal-subspace method (CSM),the proposed method utilizes the current observed data and does not require the estimated covariance matrix, thus it performs better while considering a small sample set. In the meantime, this method does not require the pre hminary DOA estimates. Moreover, the proposed method can localize completely correlated sources as it is based on the idea of maximum likelihood. Simulation results show that the performance of the propose method is brtter than CSM when the sample set is small, the signal to noise ratio (SNR) is low and the signal sources are correlated.