【摘要】 实际海洋波导是一种具有空-时相关性的衰落信道,且其驻留的海洋环境背景噪声场呈现非均匀各向异性的特性,噪声场时空相关性并非δ函数,大孔径声呐的探测性能会受到很大影响。将背景噪声建模为有色高斯随机过程,设计基于子阵平滑的主模式抑制(Dominant Mode Rejection, DMR)波束形成算法,以实现小快拍数条件下具有去相关作用的自适应处理,较好地提高了大孔径阵声呐在高斯色噪声环境下的探测能力。模拟仿真结果表明,该方法具有良好的抑制高斯色噪声的能力。更多还原

【Abstract】 The actual ocean waveguide is a fading channel with space-time correlation, where the background noise field is characterized by non-uniform anisotropy and the space-time correlation of noise field is not a-function, all these factors greatly affect the detection performance of large aperture sonar. In this paper, the background noise is modeled as a colored Gaussian stochastic process, and the algorithm of dominant mode rejection(DMR) beamforming based on sub-array smoothing is designed to realize the adaptive processing with the function of de-correlation under the condition of small snapshot number and to improve the detection ability of large aperture sonar in colored Gaussian noise background. The simulation results show that the method has good ability to suppress colored Gaussian noise.更多还原