针对水下平台协同探测时如何抑制直达波干扰和其它平台辐射噪声干扰的问题，提出了一种水下干扰抑制的稳健宽带自适应波束形成算法，在空间响应变化约束（SRV）、期望导向向量失配误差边界约束以及阵列响应零陷扩展约束条件下，建立宽带自适应波束形成优化模型，并求解波束形成权向量。该算法首先在时域宽带自适应波束形成模型中引入空间响应变化约束来保证宽带恒定束宽波束形成；然后引入最差情况性能最优（WCPO）的期望导向向量误差边界约束来设计宽带稳健自适应波束形成器，克服阵列导向向量误差对波束形成性能的影响；最后针对协同探测系统中存在的干扰源角度变化问题，从宽带自适应波束形成器协方差矩阵的定义形式出发，推导出一种空时域锥化矩阵来处理协方差矩阵，可扩展阵列响应的零陷宽度。对宽带直达波干扰和其它平台辐射噪声干扰的仿真实验表明：该算法在实现恒定束宽波束形成的同时，具有较好的抗干扰性、稳健性和零陷宽度扩展性。
Abstract
Aiming at the problem of how to suppress direct wave interference and other platform radiated noise interference in the application scenario of underwater multi-platform collaborative detection, a robust broadband adaptive beamforming algorithm is proposed for underwater interference suppression. Under the constraints of spatial response variation (SRV), desired steering vector mismatch error boundary and array response null broadening, the algorithm builds a wideband adaptive beamforming optimization model and solves the beamforming weight vector. Firstly, the spatial response change constraint is introduced into the time-domain wideband adaptive beamforming model to ensure wideband constant beamwidth beamforming. Then, the expected steering vector error boundary constraint of the worst-case performance optimal (WCPO) is introduced to design a wideband robust adaptive beamformer to overcome the influence of array steering vector error on beamforming performance. Finally, in order to solve the problem of interference angle change in the cooperative detection system, this paper derives a spatial-temporal conical matrix from the definition of the covariance matrix of the broadband adaptive beamformer, which can extend the null width of the array response.Simulation experiments of suppressing broadband direct wave interfere
关键词
自适应波束形成 /
恒定束宽 /
稳健性 /
零陷扩展
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Key words
adaptive beamformer /
constant beamwidth /
robustness /
null broadening
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