The paper discusses how to apply methods of target motion analysis on bearings-only estimation of underwater target motion parameters.

本文讨论如何使用目标运动分析方法对水下目标进行纯方位距离估计。

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Only target bearings could be obtained from passive sonar in general, the typical method used to determine target motion parameters is the"n-bearings"method.

被动声纳观察目标一般只提供目标的方位，基于声纳方位解算目标要素的传统方法是纯方位解要素法。

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But the line located in the low frequency of ship noise spectrum has high intensity and stability. This fact provides new idea in estimating target motion parameters.

而处于舰船噪声低频区的线谱具有很高的强度和稳定度，这一事实为估计目标运动要素提供了新的思路。

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