基于子带分解的宽带波束域最小方差无畸变响应高分辨方位估计方法研究

The research on broadband beamspace minimum variance distortionlessresponse high resolution direction-of-arrival estimation methodbased on sub-band decomposition

针对最小方差无畸变响应法对宽带不适用、计算量较大和如何与实际声呐系统结合这三个问题,提出了基于子带分解的宽带波束域MVDR高分辨方位估计方法:它以子带分解的方法实现MVDR在宽带情形下的扩展;利用波束转换实现降维运算,大大减小运算量和提高算法的稳健性;并且提出了在声呐系统使用中的新思路:可将该方法与声呐的多波束系统结合,直接利用声呐多波束系统的输出,可省去从阵元域到波束域的转换,进一步减少运算量;可用于替代传统的分裂波束精测定向系统或单波束系统,提高整个声呐定向系统的性能。经过理论分析、仿真实验和湖试实验,证明了该方法是简单的、有效的、可行的。

To be aimed at the three problems of the Minimum Variance Distortionless Response (MVDR) method: not suitable for the broadband, complex computation, how to combine with sonar system in existence, this paper brings forward a broadband beamspace high resolution direction-of-arrival estimation method based on sub-band decomposition. It uses the method of sub-band decomposition to realize the expansion of MVDR under broadband condition, uses the beam transforming to realize the dimension amount of calculation reduction as to reduce the amount of calculation and improve the stability of the algorithm, and brings forward a new method to combine this technology with the sonar system in existence, using the direct output of the sonar multi-beam system, which can reduce the computational complexity and leave out the transforming from the array element to beamspace, the method of which can replace the conventional split-beam direction-of-arrival estimation system or the single beam system, which can improve the performance of the whole sonar direction-of-arrival estimation system. After theoretic analysis, simulation and authentication in lake, the method proves to be simple, effective and practical.