典型概率密度背景下四阶累积量波束形成的阵增益
发布时间：2018-11-06 12:20
【摘要】：在理论上零均值高斯分布噪声的四阶累积量恒等于零,而实际噪声和混响的概率密度是影响四阶累积量波束形成技术性能的关键问题。本文针对海洋环境噪声与海底混响的瞬时幅度分布,分别推导了四阶累积量波束形成阵增益函数;建立了阵增益与阵元数、海洋环境噪声和海底混响统计特性的四阶矩和二阶矩及输入信噪比的关系;确定了与常规波束形成阵增益之间存在临界信噪比,高于临界信干比时四阶累积量波束形成可以获得比常规波束形成更高的阵增益与分辨率。实验数据处理结果验证了四阶累积量波束形成阵增益和分辨率理论结果的一致性。
[Abstract]:In theory, the fourth order cumulant of Gao Si distributed noise with zero mean is equal to zero, and the probability density of actual noise and reverberation is the key problem affecting the performance of fourth-order cumulant beamforming. In this paper, the gain function of the fourth order cumulant beamforming array is derived for the instantaneous amplitude distribution of ocean ambient noise and seabed reverberation. The relationship between array gain and the number of array elements, the fourth and second moments of ocean ambient noise and the statistical characteristics of sea reverberation, as well as the input signal-to-noise ratio (SNR) are established. It is determined that there is a critical signal-to-noise ratio (SNR) between the gain of conventional beamforming array and the fourth order cumulant beamforming can obtain higher array gain and resolution than conventional beamforming when the signal to interference ratio is higher than the critical signal-to-interference ratio. The experimental data processing results verify the consistency between the gain and resolution of the fourth order cumulant beam forming array.
【作者单位】： 哈尔滨工程大学水声技术重点实验室;哈尔滨工程大学水声工程学院;
【基金】：国家自然科学基金(51279033) 黑龙江省自然科学基金(F201346)资助
【分类号】：TN911.7
[Abstract]:In theory, the fourth order cumulant of Gao Si distributed noise with zero mean is equal to zero, and the probability density of actual noise and reverberation is the key problem affecting the performance of fourth-order cumulant beamforming. In this paper, the gain function of the fourth order cumulant beamforming array is derived for the instantaneous amplitude distribution of ocean ambient noise and seabed reverberation. The relationship between array gain and the number of array elements, the fourth and second moments of ocean ambient noise and the statistical characteristics of sea reverberation, as well as the input signal-to-noise ratio (SNR) are established. It is determined that there is a critical signal-to-noise ratio (SNR) between the gain of conventional beamforming array and the fourth order cumulant beamforming can obtain higher array gain and resolution than conventional beamforming when the signal to interference ratio is higher than the critical signal-to-interference ratio. The experimental data processing results verify the consistency between the gain and resolution of the fourth order cumulant beam forming array.
【作者单位】： 哈尔滨工程大学水声技术重点实验室;哈尔滨工程大学水声工程学院;
【基金】：国家自然科学基金(51279033) 黑龙江省自然科学基金(F201346)资助
【分类号】：TN911.7
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