摘要
当快拍数较小时,自适应波束形成算法的性能将会降低,而对角加载算法是提高这类自适应波束形成算法稳健性的简单而有效的方法,但是至今没有一种比较有效的方法来确定对角加载值。本文提出了一种确定加载值的方法,这种方法在加载值和协方差矩阵的估计误差之间建立联系,它能够根据阵列的输出数据动态的调整加载值。计算机仿真证实了该算法的有效性。
It is well known that the performance of adaptive beamforming algorithm is degraded when the sample length is short. The diagonal loading method is a simple and efficient method for improving the robustness of adaptive beamforming in such cases. However, till now there is no effective approach to determine the diagonal values. In this paper, an algorithm for determination of the diagonal loading values is proposed, which sets up a connection between the diagonal loading values and the estimation error of the covariance matrix. Thus, the proposed method adjusts the diagonal loading value according to the array data. Simulation results show that this method is computationally efficient.
出处
《信号处理》
CSCD
北大核心
2007年第1期46-49,共4页
Journal of Signal Processing
关键词
自适应波束形成
协方差矩阵估计误差
对角加载
adaptive beamforrning
estimation error of the covariance matrix
diagonal loading
