摘要
基于MMSE准则提出一种新的在随机阵列误差条件下宽带信号波达方向(DOA)估计算法,并分析了随机阵列误差对算法的影响。将含有阵列误差的宽带信号通过窄带滤波器组转化为窄带信号,在MMSE准则下采用自回归迭代方法恢复窄带信号的稀疏表示,由此得到信号源个数和DOA估计。新算法不仅有超分辨率能力,而且不需要预先知道信号源个数,此外还能对相干信号进行DOA估计,对阵列误差有比相干子空间法更好的稳健性。计算机仿真验证了算法的有效性和稳健性。
A new approach is proposed,which is based on minimum mean-square error （MMSE） criterion,for wideband signals spatial direction-of-arrival （DOA） estimation when there is array error,and the impact of random array error to the new algorithm is analyzed.The wideband signal mixed with array error is put into a bank of narrowband filters to obtain narrowband signals,then the sparse representation of the narrowband signals are recovered by re-iterative method in the MMSE frameworks,and the number and DOA of sources can be estimated from the sparse representation.The new method not only has high resolution,but also do not require the number of sources for direction finding,furthermore,this algorithm can estimate coherent signals and the robustness of new algorithm to array error is better than coherent subspace algorithms.The simulated results confirmed the effectiveness and robustness of the new method.
出处
《科学技术与工程》
北大核心
2013年第29期8635-8641,共7页
Science Technology and Engineering
