文章介绍了光纤激光水听器的基本原理,国内外光纤激光水听器的研究进展以及发展趋势,同时,详细介绍了2005年以来中国科学院半导体研究所在光纤激光水听器技术方面的研究工作,包含了标量水听器技术、矢量水听器技术、水听器阵列技术、外...文章介绍了光纤激光水听器的基本原理,国内外光纤激光水听器的研究进展以及发展趋势,同时,详细介绍了2005年以来中国科学院半导体研究所在光纤激光水听器技术方面的研究工作,包含了标量水听器技术、矢量水听器技术、水听器阵列技术、外场实验及行业应用等。目前,课题组光纤激光水听器声压灵敏度优于-140 dB re 1 pm/μPa,频响区间20~2000 Hz,拖曳阵列外径小于30 mm,阵元数目64。我国的光纤激光水听器阵列技术正处于从实验室走向应用的重要阶段,开展好实用化研究是当务之急。展开更多
Fiber-optic hydrophone (FOH) is a significant type of acoustic sensor, which can be used in both military and civilian fields such as underwater target detection, oil and natural gas prospecting, and earthquake inspec...Fiber-optic hydrophone (FOH) is a significant type of acoustic sensor, which can be used in both military and civilian fields such as underwater target detection, oil and natural gas prospecting, and earthquake inspection. The recent progress of FOH is introduced from five aspects, including large-scale FOH array, very-low-frequency detection, fiber-optic vector hydrophone (FOVH), towed linear array, and deep-sea and long-haul transmission. The above five aspects indicate the future development trends in the FOH research field, and they also provide a guideline for the practical applications of FOH as well as its array.展开更多
针对基于传播算子方法(Propagator Method,PM)的水听器阵波达方向(Direction of Arrival,DOA)估计在低信噪比或者小快拍数时性能变差的问题,文章提出一种改进的基于PM算法的水听器阵方位估计方法。该方法利用信号子空间的旋转不变性特...针对基于传播算子方法(Propagator Method,PM)的水听器阵波达方向(Direction of Arrival,DOA)估计在低信噪比或者小快拍数时性能变差的问题,文章提出一种改进的基于PM算法的水听器阵方位估计方法。该方法利用信号子空间的旋转不变性特征对协方差矩阵进行扩展和重构,通过分块协方差矩阵的子矩阵得到传播算子矩阵。通过传播算子矩阵构造扩展噪声子空间,然后利用信号子空间与噪声子空间的正交性估计空间谱。仿真实验和湖上实验的结果表明:相较于传统PM方位估计算法,文中算法在低信噪比或者小快拍情况下具有较好的方位估计性能,在信噪比为0 dB时,文中方法比传统PM算法均方根误差减少0.6°;在快拍数为150时,比传统PM算法的均方根误差减少0.1°。展开更多
文摘文章介绍了光纤激光水听器的基本原理,国内外光纤激光水听器的研究进展以及发展趋势,同时,详细介绍了2005年以来中国科学院半导体研究所在光纤激光水听器技术方面的研究工作,包含了标量水听器技术、矢量水听器技术、水听器阵列技术、外场实验及行业应用等。目前,课题组光纤激光水听器声压灵敏度优于-140 dB re 1 pm/μPa,频响区间20~2000 Hz,拖曳阵列外径小于30 mm,阵元数目64。我国的光纤激光水听器阵列技术正处于从实验室走向应用的重要阶段,开展好实用化研究是当务之急。
基金The authors would like to acknowledge the support of the National Natural Science Foundation of China(Grant Nos.61775238,61705263,and 61705262).
文摘Fiber-optic hydrophone (FOH) is a significant type of acoustic sensor, which can be used in both military and civilian fields such as underwater target detection, oil and natural gas prospecting, and earthquake inspection. The recent progress of FOH is introduced from five aspects, including large-scale FOH array, very-low-frequency detection, fiber-optic vector hydrophone (FOVH), towed linear array, and deep-sea and long-haul transmission. The above five aspects indicate the future development trends in the FOH research field, and they also provide a guideline for the practical applications of FOH as well as its array.
文摘针对基于传播算子方法(Propagator Method,PM)的水听器阵波达方向(Direction of Arrival,DOA)估计在低信噪比或者小快拍数时性能变差的问题,文章提出一种改进的基于PM算法的水听器阵方位估计方法。该方法利用信号子空间的旋转不变性特征对协方差矩阵进行扩展和重构,通过分块协方差矩阵的子矩阵得到传播算子矩阵。通过传播算子矩阵构造扩展噪声子空间,然后利用信号子空间与噪声子空间的正交性估计空间谱。仿真实验和湖上实验的结果表明:相较于传统PM方位估计算法,文中算法在低信噪比或者小快拍情况下具有较好的方位估计性能,在信噪比为0 dB时,文中方法比传统PM算法均方根误差减少0.6°;在快拍数为150时,比传统PM算法的均方根误差减少0.1°。
