【摘要】：在理論上零均值高斯分布噪聲的四階累積量恒等于零,而實(shí)際噪聲和混響的概率密度是影響四階累積量波束形成技術(shù)性能的關(guān)鍵問題。本文針對(duì)海洋環(huán)境噪聲與海底混響的瞬時(shí)幅度分布,分別推導(dǎo)了四階累積量波束形成陣增益函數(shù);建立了陣增益與陣元數(shù)、海洋環(huán)境噪聲和海底混響統(tǒng)計(jì)特性的四階矩和二階矩及輸入信噪比的關(guān)系;確定了與常規(guī)波束形成陣增益之間存在臨界信噪比,高于臨界信干比時(shí)四階累積量波束形成可以獲得比常規(guī)波束形成更高的陣增益與分辨率。實(shí)驗(yàn)數(shù)據(jù)處理結(jié)果驗(yàn)證了四階累積量波束形成陣增益和分辨率理論結(jié)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.
【作者單位】： 哈爾濱工程大學(xué)水聲技術(shù)重點(diǎn)實(shí)驗(yàn)室;哈爾濱工程大學(xué)水聲工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(51279033) 黑龍江省自然科學(xué)基金(F201346)資助
【分類號(hào)】：TN911.7

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