非圆信号阵列测向的研究概况

Survey of DOA Estimation for Noncircular Signals

阵列测向的理论与技术已日臻完善，近期研究主要集中在算法实用化以及利用信号的特殊性质等方面。BPSK等信号具有非圆特性，MSK等信号经过一定预处理也具有非圆特性，利用信号非圆特性的阵列测向问题逐渐成为一个研究热点。文章介绍了非圆信号的定义与分类，综述了非圆信号测向的现状，包括各种非圆信号测向算法及其性能分析，以及非圆信号信源个数估计等其它问题，并对其发展方向进行了预测。

The research on direction finding in the array signal processing domain is fruitful and almost has been reached its every aspect. The recent study focused on the applications and the utiliza- tions of the additional property of the signals impinging on the array. Some signals such as BPSK modulated signals have the so- called property of noncircularity and some other signals including MSK modulated signals also have this property after some simple preprocessing. Direction finding for noncireular signals received more and more attention. After the definition and classification of noncircular signals are introduced, a number of direction finding algorithms for noncircular signals and the performance analysis of these algorithms are reviewed in this paper. The relative problems including detecting the number of the noncircular signals are also described. The prospects of development in this area are concluded in the end of this paper.