研究了恒模特性和DOA估计之间的联系，基于最小二乘恒模和权向量多项式求根提出一种简单有效的LSCM-DOA估计新算法，同时为分析此DOA估计算法的性能，详细推导了恒模信号在任意阵型下的克拉美-罗界。理论分析和实际仿真证明该算法几乎达到其克拉美-罗界，而且性能相对于未应用恒模特性的MUSIC和ESPRIT等算法较优越，尤其在小快拍数和低信噪比情况下取得了良好的效果，并且因为未进行谱峰搜索而将计算复杂度控制在较低范围内。另外，该方法还解决了强信号源未移除时对弱信号源的DOA估计问题。计算机仿真证明了算法理论是

This paper make a research on the relationship between DOA estimation and constant modulus property and propose a simple direction estimation algorithm based on LS-CMA blind beamforming for multiple sources and polynomial extraction. Purpose to analyzes the estimation performance of the algorithm, this paper also derives the Cramer-Rao bounds (CRB) of CM signals for arbitrary array configurations and specialize to uniform linear arrays. It has been demonstrated that this algorithm almost achieve the CRB and has perfect performance contrast to MUSIC,ESPRIT which that without concerning for the property of CM, especially under the environment of few samples and low SNR. In addition , it can estimate the weak sources when the stronger sources are not removed, as well as the computational complexity will not increase for without using spectra search. Computer simulations proves correctness and effectiveness of this new algorithm.

TN911