If there is damp, the instabilities may appear, and when the damp is so small that can be neglected, there exists only spatial gain.

当存在阻尼时，就有可能出现不稳定性。而当阻尼很小可被忽略后，将仅出现空间增益效应。

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However, in shallow water, because the arrival signals of the vertical linear array are not plane waves, the spatial gain needs to be estimated properly.

而在浅海环境中，由于到达垂直线列阵的声波并不满足平面波假设，其空间增益需要作出正确估计。

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A method to eliminate the correlation of signal sources is proposed, which can help to estimate the signal sources' DOA through randomly changing the spatial gain.

本文提出了一种以空间增益随机变化的方法来去掉相关信源之间的相关性，以获得对相关信源的DOA的估计。

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