| Method for vessel attitude estimation by spatial correlation function for bottom reverberation |
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| 作者姓名： | FENG Lei DENG Kai WANG Changhong |
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| 作者单位： | [1]Institute of Acoustics, Chinese Academy of Sciences Beijing 100080 [2]Graduate School of the Chinese Academy of Sciences Beijing 100039, Chinese Academy of Sciences Beijing 100080 [3]不详, Chinese Academy of Sciences Beijing 100080 |
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| 基金项目： | This work is supported by the National Hi-Tech Research and Development Program of China |
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| 摘 要： | Under the assumption that the sea bottom is an almost-flat and randomly rough thin layer, a spatial correlation model for bottom reverberation is constructed. At high signal noise ratio, the phase of the spatial correlation function is the product of sound wave number and the vertical vector between two hydrophones. In a nominally horizontal plane, roll and pitch bring on the vertical vector between the hydrophones. Then an equation including roll, pitch and the phase of the spatial correlation function is found. If a parallelogram can be constructed by 3 hydrophones and the rat ios of its acreage to diagonals are not smaller than half of the wavelength, roll and pitch can be obtained analytically or by optimal method. However, the ranges of roll and pitch are restricted because of the phase ambiguity. Using Fisher information matrix, the Cramer-Rao lower bound is obtained. Results from computer simulation and sea test data prove the feasibility of the method.
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| 关 键 词： | 空间相关函数 底部回响 水声学 空间相关模型 |
| 收稿时间： | 2005-07-06 |
| 修稿时间： | 2005-07-062005-11-08 |
Method for vessel attitude estimation by spatial correlation function for bottom reverberation |
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| Authors: | FENG Lei DENG Kai WANG Changhong |
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| Abstract: | Under the assumption that the sea bottom is an almost-fiat and randomly rough thin layer, a spatial correlation model for bottom reverberation is constructed. At high signal noise ratio, the phase of the spatial correlation function is the product of sound wave number and the vertical vector between two hydrophones. In a nominally horizontal plane, roll and pitch bring on the vertical vector between the hydrophones. Then an equation including roll, pitch and the phase of the spatial correlation function is found. If a parallelogram can be constructed by 3 hydrophones and the ratios of its acreage to diagonals are not smaller than half of the wavelength, roll and pitch can be obtained analytically or by optimal method. However, the ranges of roll and pitch are restricted because of the phase ambiguity. Using Fisher information matrix, the Cramer-Rao lower bound is obtained. Results from computer simulation and sea test data prove the feasibility of the method. |
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