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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。
In order to solve the three problems of wideband non-applicable, large amount of calculation and how to combine with the actual sonar system, this paper proposes a method of high resolution MVDR DOA estimation based on sub-band decomposition, which is based on subband decomposition Method to realize the extension of MVDR in the case of broadband; the use of beam transformation to reduce the dimension of the operation, greatly reduce the amount of computation and improve the robustness of the algorithm; and put forward a new idea in the use of sonar system: the method and the sonar The combination of beam system and direct use of the output of the sonar multi-beam system can save the conversion from the array element to the beam field and further reduce the computational complexity. It can be used instead of the traditional split beam steering or single-beam system to improve the entire sonar Directional system performance. After theoretical analysis, simulation experiment and lake experiment, it is proved that this method is simple, effective and feasible.