采用RWT的信号波达方向估计方法

Signal arrival direction estimation method using RWT

针对宽带多线性调频信号波达方向(DOA)估计精度低的问题,提出了一种基于Radon-Wigner变换(RWT)和多重信号分解(MUSIC)的信号DOA估计方法.该方法首先利用RWT在多目标环境下能够有效抑制交叉项干扰和噪声,具有很好的时频汇聚性特点,通过峰值搜索提取信号的初始频率和调频斜率;然后将信号阵列的时变方向矩阵变换为非时变方向矩阵,并得到RWT域的阵列信号相关矩阵;最后利用MUSIC空间谱分析方法进行信号的DOA估计.仿真实验表明基于RWT的DOA估计方法处理非平稳信号时是有效的.

According to the low accuracy of direction of arrival （DOA） estimation for wideband linear frequency modulation （LFM） signals, a method of DOA estimation based on Radon-Wigner transform （RWT） and multiple signal classification （MUSIC） was proposed. In this method, first the original frequency and the frequency modulation slope were extracted by peak research, with the excellent time-frequency concentration performance of RWT which can eliminate cross interference terms and noise effectively in the background of multiple sources. Then the time-variable direction matrix of sig- nal array was transformed to the fixed direction matrix, and the RWT domain correlation matrix of the sensor array sources was acquired. Finally the MUSIC spatial spectrum analysis algorithm was used to estimate the DOA of signals. The results show that this method based on RWT can estimate DOA ef- ficiently for non-stationary signals.