针对非均匀白噪声背景下窄带信号的DOA估计,提出了一种新型DOA估计算法。首先构造出包含待估信号和噪声各种参数的最大似然函数,然后推导出极值条件进行寻优,得出待估计参数的估计值。同时还给出了一种新的噪声参数估计方法——逆迭代参数估计。理论分析和仿真实验表明,新型算法的性能优于非均匀噪声背景下传统的最大似然估计算法,且算法复杂度不大。

Under non-uniform white noise, a novel DOA algorithm was proposed. Firstly, the likelihood function of unknown parameters of noise and estimated signals was given. Then, the iterative method was used to make the algorithm converge in a stepwise way and the estimated parameters were got. In addition, a new method was proposed to estimate the parameters of noise. The theoretical analysis and computer simulation show that the performance of proposed algorithm is better than that of conventional maximum-likelihood DOA estimation algorithm in the presence of non-uniform white noise, and its complexity is not too high.