基于协方差矩阵对角加载的信源数估计方法  

Determining the number of sources based on diagonal loading to the covariance matrix

作　　者：谢纪岭 司锡才[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《系统工程与电子技术》2008年第1期46-49,共4页Systems Engineering and Electronics

摘　　要：针对基于信息论准则的信源数估计方法在白噪声背景下具有良好的估计性能,但在色噪声背景下,利用信息论准则进行信源数估计时,会得到真实信源数目过估计的问题。为了将信息论准则推广应用到色噪声背景下,提出了一种改善色噪声背景下噪声特征值发散的特征值校正算法,首先采用对角加载技术平滑色噪声背景下的噪声特征值,然后对平滑后的特征值利用信息论准则估计信源数。仿真结果证明了该算法的有效性。To determine the number of sources imping on an array of sensors correctly is very important for most high resolution DOA algorithms, the approach of estimating the number of signals based on information theoretic criteria has good estimation performance in the assumption of white noise, while it always leads to over-estimation of the sources in colored noise field. In order to use information theoretic criteria in spatially correlated colored noise field, a method to eliminate the inequality of the noise eigenvalues caused by colored noise is presented,using the corrected eigenvalues, the information criterion approach can estimate the number of sources in colored noise,and computer simulation results prove the effective performance of the method.

关 键 词：信源数估计 对角加栽 MDL准则 AIC准则 

分 类 号：TN911.7[电子电信—通信与信息系统]