基于四阶累积量的相干信号频率和二维到达角联合估计的新算法

杜刚; 张永顺; 王永良; 姜新迎

doi:10.3724/SP.J.1146.2007.01299

基于四阶累积量的相干信号频率和二维到达角联合估计的新算法

doi: 10.3724/SP.J.1146.2007.01299

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出版历程
- 收稿日期: 2007-08-09
- 修回日期: 2008-04-15
- 刊出日期: 2009-02-19

A New Method for Joint Estimation of Frequency and 2-D Arrival Angles of Coherent Signals Based on Fourth-Order Cumulant

摘要

摘要: 该文提出了一种基于四阶累积量的相干信号频率和二维到达角联合估计的新算法CTSS算法。CTSS算法利用双平行线阵的时空数据以及平滑技术构造了一个时空平滑矩阵，通过对其进行特征分解，并利用分解得到的特征值和特征矢量估计出空间相干信号的三维参数。在色噪声环境下，该算法能够精确地估计空间相干信号的三维参数，无需多维谱峰搜索，能实现信号三维参数的自动配对，并有效地解决了信源参数兼并问题。计算机仿真结果验证了算法的有效性。
- 信号处理;四阶累积量;相干源;三维参数估计;平滑技术
Abstract: Based on fourth-order cumulant, this paper presents a new method, i.e. CTSS algorithm, for joint estimation of frequency and 2-D arrival angles of coherent signals. Firstly a time-space smoothing matrix is constructed by temporal and spatial data of two parallel uniform linear arrays and the smoothing technique, and then 3-D parameters of coherent signals can be obtained from its eigenvalues and the corresponding eigenvectors. In Gaussian colored noise, the algorithm can precisely estimate 3-D parameters of coherent signals, and does not need multidimensional spectrum peak search with 3-D parameters paired automatically. In addition, it can still estimate correctly 3-D parameters of signals when signals have the same one or two dimensional parameters. Computer simulation confirms its effectiveness.

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