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中文摘要：
利用一种水声信道统计不变特征（波导不变量）实现被动探测。采用双阵元,分别对每一个阵元接收的宽带噪声信号进行LOFAR分析,对LOFAR图利用Hough变换等图像处理方法进行参数估计,得到波导不变量和曲线（文中讨论抛物线）参数估计值,进而运用几何关系估计出运动目标的航向角、速度和距离信息。利用Matlab仿真验证了该方法的正确性。
英文摘要：
The passive detection is realized by using a statistical invariant feature of underwater acoustic channel （wa- veguide invariant）. The proposed method needs two sensors at least to calculate the motion parameters. LOFARgrams analysis is made for broadband noise signals which are respectively received by the two sensors. To get the estimation values of wavegnide invariant and parameters of curve, HOUGH conversion is used for parameter estimation of LO- FARgrams. Then the moving target＇s angle, distance and speed are estimated according to geometrical relationship. The method has been employed to process the LOFARgrams obtained from Acoustic Toolbox simulation, and the estimated results of target parameters show the validity of the method.
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