基于波束特征值分析的单双目标分辨技术方法

目标源数估计是基于特征值分析的高分辨谱估计技术中用来划分信号子空间和噪声子空间的关键步骤,现有的估计方法可以工作的最低信噪比大约在0dB左右。通过分析直线阵空间功率谱以及相关函数,给出了波束特征值的概念,并说明了波束特征值是由直线阵阵列流形所决定的,利用这一规律设计了波束特征值分辨波束内多目标的方法,可以在波束内分辨单、双目标,通过仿真分析说明可以在-10dB信噪比条件下工作。

Estimating the single or double signal sources based on the beam eigenvalue method

For the eigenstructure-based beam-forming method,the source number estimation is crucial to divide the signal sub-space and the noise sub-space. The normal method is effect at about 0dB,which is not high enough for the practical applications. Through analyzing the space power spectrum and the corr-elative function of a line array,the concept of beam eigenvalue,which is decided by the line array shape,is proposed. The method based on the beam eigenvalue is designed to estimate the source number inside a beam. The simulation experiment shows that this method can differentiate the single and double targets at the lower signal to noise rate of -10dB.