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基于非圆信号的Unitary ESPRIT(NC Unitary ESPRIT)算法,与unitary ESPRIT相比,明显提高了DOA估计的精度,并且可以处理更多的入射波。但是,在对多个入射波进行DOA估计的时候,更常见的是入射波既包含圆信号又包含非圆信号情形,而NC Unitary ESPRIT算法不能很好地进行这类信号的DOA估计。在分析两种信号共同存在时的信号模型结构的基础上,提出了一种新的同时估计圆信号和非圆信号DOA的unitary ESPRIT算法,并且该方法能够区分出圆信号和非圆信号。计算机仿真表明了所提出的方法比unitary ESPRIT方法有更好的估计效果,并且信号源中非圆信号所占的比重越大,估计效果越好。而当入射波均为非圆信号时,提出的算法性能与NC Unitary ESPRIT相似。
Based on the non-circular signal Unitary ESPRIT (NC Unitary ESPRIT) algorithm, compared with the unitary ESPRIT, the accuracy of DOA estimation is significantly improved and more incident waves can be processed. However, it is more common for DOA estimation of multiple incident waves that incident waves contain both circular and non-circular signals, whereas NC Unitary ESPRIT does not perform well in DOA estimation of such signals. A new unitary ESPRIT algorithm for both circular and non-circular DOA estimation is proposed based on the analysis of signal model structure when both signals coexist. The method can distinguish between circular and non-circular signals. Computer simulation shows that the proposed method has a better estimation effect than the unitary ESPRIT method, and the greater the proportion of non-circular signals in the signal source, the better the estimation effect. When the incident wave is a non-circular signal, the proposed algorithm performance is similar to NC Unitary ESPRIT.