水下目标宽带高分辨方位估计方法的性能研究

针对水下宽带处理的应用，研究了宽带高分辨方位估计的相干信号子空间处理方法（CSS）。应用子空间扰动分析研究了宽带CSS法的统计性能，得出了宽带CSS法方位估计误差随信噪比变化的关系。通过计算机仿真，得到了宽带CSS法的分辨概率和均方误差曲线，以及噪声背景和混响背景中CSS法的统计性能曲线。研究结果表明：宽带CSS法估计精度高，方位估计均方误差达到宽带CRB；分辨门限低，抗混响能力强，是实现水下目标宽带高分辨方位估计的有效方法。

The Performance of the High Resolution DOA Estimator for Underwater Wide Band Sources

Aiming at the application of underwater wide band processing,coherent signal-subspace processing method(CSS) for high resolution DOA estimation of under water wide band sources was studied.By using subspace disturbing analysis to investigate the statistical performance of the CSS,the relationship between the DOA estimation error and the signal to noise ratio(SNR) was presented.The DOA estimation mean square error and resolution probability of the CSS in the Gausian white noise and reverberation were obtained by computer simulations.The research results show that wide band CSS method possesses good performance due to being close to the Cramer-Rao Bound(CRB) of DOA estimation of wide band sources,the low resolution threshold and the anti reverberation ability.