强信号背景下弱信号角度时延的联合Capon估计方法

针对强信号背景下弱信号角度时延联合估计过程中的弱信号数目难以精确估计问题,在分析Capon谱估计法估计信号DOA原理的基础上,将Capon谱估计法进行扩展,提出了一种在强信号背景下弱信号角度时延联合估计方法。为弥补Capon法分辨力较差的劣势,将扩展的Capon法与有高分辨性能的m-Capon算法结合,提出了一种改进的m-Capon方法,能区分来波方向接近的不同目标信号。研究和仿真结果表明:该方法无需对弱信号的信源数进行估计,也无需分解特征值,且在快拍数较少时仍具适用性。

Weak Signal DOA Time-Delay Joint Capon Estimation Method in Presence of Strong Signals

For the problem of the inaccurate signal source number estimation of weak signals in the procedure of weak signals DOA and time delay joint estimation in the presence of strong signals, an advanced Capon spectrum estimation method was proposed after analyzing the principle of Capon spectrum estimation in this paper. In order to eliminate the weakness of low resolution of Capon method, an advanced m Capon method which combined the advanced Capon method and the high resolution m-Capon algorithm was proposed to distinguish different signals which were closed to each other. The proposed method would need neither the procedure of signal source estimation nor the eigen value decomposition and had the applicability in the situation of small snapshots. The computer simulation results havd proved the validity of this method.