非圆特征恢复特征空间投影鲁棒波束形成

Noncircularity restoral eigenspace projection robust beamforming

提出了一种利用非圆特征恢复思想的鲁棒波束形成方法。该方法在特征空间投影技术的基础上,进一步利用波束形成器输出的非圆特征参数构造代价函数,通过角度搜索使代价函数最大化来修正主瓣中心指向,在保证鲁棒性的同时尽可能提升波束形成器的输出性能。同时,该方法不需要设置用户参数,且适用于任意阶非圆信号,对于旁瓣干扰信号的非圆特性不敏感,具有广泛的应用背景。最后分别针对二阶非圆信号情形和高阶非圆信号情形进行了仿真,仿真结果验证了该方法的有效性和优越性。

A new robust beamformer exploiting noncircularity restoral of desired signal is proposed.The new approach is based on the eigenspace projection,further uses the noncircularity coefficient of the beamformer output to construct the cost function and modifies the pointing direction of the main beam via azimuth searching to maximize the noncircularity coefficient of the beamformer output,so that it could improve the output performance of beamformer while the robustness is guaranteed.The new method doesn＇t need to set user parameters,and it is applicable for the Qth（Q≥2）order noncircular modulated signal.At the same time,the new method is not sensitive to the noncircularity of the sidelobe interference signal,which is widely used in practice.At the end of this paper,the simulations for the case of second order noncircular signal and the case of high order noncircular signal were carried out,and the results verify the validity and superiority of the proposed approach.