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本文以阵列信号处理为背景讨论了二维信号参量估计问题,提出并探讨了一种双线性平行阵列的信号模型及其特征结构。根据协方差矩阵的性质,构造了波达方向矩阵。理论分析表明:通过对波达方向矩阵的特征分解,可以直接获得待估计的信号方向矢量和信号方向元素,并可由此估计信号参量,从而完全避开了多项式搜索。本文还论述了如何用波达方向矩阵法解决相干源问题。波达方向矩阵法不但运算量极小,而且具有分辨率高,估计方差小等优点。本文给出了计算机仿真对比实验,验证了该方法的性能。
In this paper, the problem of two-dimensional signal parameter estimation is discussed in the background of array signal processing. A signal model and its characteristic structure of a bilinear parallel array are proposed and discussed. According to the properties of the covariance matrix, the DOA matrix is constructed. The theoretical analysis shows that the signal direction vector and the signal direction element to be estimated can be directly obtained by decomposing the characteristics of the arrival direction matrix, and the signal parameters can be estimated accordingly, thereby avoiding the polynomial search completely. This article also discusses how to solve the coherent source problem by using the DOA matrix method. The DOA matrix method has the advantages of low computational complexity, high resolution and small variance in estimation. In this paper, a comparison experiment of computer simulation is given, which verifies the performance of this method.