C3D测深侧扫声纳探测系统综述   总被引：2，自引：0，他引：2  

沈蔚  程国标  龚良平  李勇攀  韩军  章守宇  张进 《海洋测绘》2013,(4):79-82

对C3D测深侧扫声纳系统的构成、工作原理、性能、优点、应用等进行了介绍,对基于C3D构建水下探测系统和工程实践进行了研究,对C3D数据处理工具和方法进行了探讨,对C3D的优势、不足和应用前景进行了总结。实测表明,C3D是一款性能优越能够满足多种水下工程需要的声纳探测系统。  相似文献   

Sidescan survey results from a multibeam sonar system—sea beam 2000     

Kushal Talukdar  William Capell  Christos Zabounidis 《Marine Geodesy》2013,36(2-3):63-79

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A generic swath‐mapping data format     

J. Scott Ferguson  Daniel A. Chayes 《Marine Geodesy》2013,36(2-3):129-140

There is a pressing need for standardization of data derived from bathy‐metric swath‐mapping systems. Currently several dozen multibeam and sidescan sonar data formats exist within the oceanographic community, and more can be expected as new systems are developed. Without some standardization of swath‐mapping data formats, the capability for use and integration of data from different systems will be severely compromised.

This paper presents a strategy for organizing swath bathymetry data in a logical modular fashion that will allow data from all current swath bathymetric sonar systems to be stored and accessed in a common fashion. We have chosen the approach of defining compact efficient modules for each logically independent portion of a data record and storing it in a manner that is portable between diverse computer architectures and operating systems. This approach is extensible to accommodate new types of data. Although specifically developed for swath bathymetry, this format is also capable of supporting digital sidescan data and other types of swath data.  相似文献   

Seafloor sediment classification based on multibeam sonar data   总被引：1，自引：1，他引：0  

ZHOUXinghua CHENYongqi 《地球空间信息科学学报》2004,7(4):290-296

The multibeam sonars can provide hydrographic quality depth data as well as hold the potential to provide calibrated measurements of the seafloor acoustic backscattering strength. There has been much interest in utilizing backscatters and images from multibeam sonar for seabed type identification and most results are obtained. This paper has presented a focused review of several main methods and recent developments of seafloor classification utilizing multibeam sonar data or/and images. These are including the power spectral analysis methods, the texture analysis, traditional Bayesian classification theory and the most active neural network approaches.  相似文献   

Sea-floor scour at the mouth of Hudson Strait by deep-keeled icebergs from the Laurentide Ice Sheet     

J.M. Metz  J.A. Dowdeswell  C.M.T. Woodworth-Lynas 《Marine Geology》2008,253(3-4):149-159

Physical evidence on the dimensions of icebergs released from the mouth of Hudson Strait into the northwest Atlantic during the last Heinrich event (H-0) is presented. Side-scan sonar imagery shows scour marks up to 700 m wide and longer than 28 km. These scour marks were carved by gigantic icebergs (megabergs) with keel drafts possibly as great as 660 m capable of scouring trenches 20 to 25 m deep into the seabed. These icebergs were likely calved from the grounding margin of a thick (possibly as thick as 640 m) rapidly-flowing glacial margin during the H-0 Heinrich event (11 ka BP). Along with the relatively few megabergs released were large numbers of smaller icebergs that calved from the ice margin at the same time and were also produced from break-up of the megabergs. Scouring of the seabed by the large and smaller icebergs happened at the same time, with megabergs scouring only in the deep waters of Hatton Basin, and the smaller bergs scouring only on the eastern, shallow margin of the Basin at the continental shelf break.  相似文献   

Influence of benthic sediment transport on cold‐water coral bank morphology and growth: the example of the Darwin Mounds,north‐east Atlantic     

ANDREW J. WHEELER  MAXIM KOZACHENKO  DOUG G. MASSON  VEERLE A. I. HUVENNE 《Sedimentology》2008,55(6):1875-1887

The Darwin Mounds are small (up to 70 m in diameter), discrete cold‐water coral banks found at c. 950 m water depth in the northern Rockall Trough, north‐east Atlantic. Formerly described in terms of their genesis, the Darwin Mounds are re‐evaluated here in terms of mound growth processes based on 100 and 410 kHz side‐scan sonar data. The side‐scan sonar coverage is divided into a series of acoustic facies representing increasing current speed and sediment transport/erosion from south to north: pockmark facies, ‘mounds within depressions’ facies, Darwin Mound facies, stippled seabed facies and sand wave facies. Mound morphometric changes are quantified and show a south‐to‐north divergence from an inherited morphology, reflecting the outline of coral‐colonized fluid escape structures, to developed, downstream elongated, elevated mound forms. It is postulated that increasing current speeds and bedload sand transport favour mound growth and development by a process of enhanced sand sedimentation within mounds due to current deceleration by frictional drag around coral colonies. Comparisons are made with similar growth processes attributed to comparably sized cold‐water coral mounds in the Porcupine Seabight, offshore Ireland.  相似文献   

Merged GLORIA sidescan and Hydrosweep pseudo-sidescan: Processing and creation of digital mosaics     

Robert T. Bird  Roger C. Searle  Valerie Paskevich  David C. Twichell 《Marine Geophysical Researches》1996,18(6):651-661

We have replaced the usual band of poor-quality data in the near-nadir region of our GLORIA long-range sidescan-sonar imagery with a shaded-relief image constructed from swath bathymetry data (collected simultaneously with GLORIA) which completely cover the nadir area. We have developed a technique to enhance these pseudo-sidescan images in order to mimic the neighbouring GLORIA backscatter intensities. As a result, the enhanced images greatly facilitate the geologic interpretation of the adjacent GLORIA data, and geologic features evident in the GLORIA data may be correlated with greater confidence across track. Features interpreted from the pseudo-sidescan may be extrapolated from the near-nadir region out into the GLORIA range where they may nt have been recognized otherwise, and therefore the pseudo-sidescan can be used to ground-truth GLORIA interpretations. Creation of digital sidescan mosaics utilized an approach not previously used for GLORIA data. Pixels were correctly placed in cartographic space and the time required to complete a final mosaic was significantly reduced. Computer software for digital mapping and mosaic creation is incorporated into the newly-developed Woods Hole Image Processing System (WHIPS) which can process both low- and high-frequency sidescan, and can interchange data with the Mini Image Processing System (MIPS) most commonly used for GLORIA processing. These techniques are tested by creating digital mosaics of merged GLORIA sidescan and Hydrosweep pseudo-sidescan data from the vicinity of the Juan Fernandez microplate along the East Pacific Rise (EPR).  相似文献   

实验室模拟海水结冰装置与试验     

郭纪捷  郑国芝 《海洋技术学报》2003,22(4):7-11

研究海冰的声学探测技术需要实际海冰和低温环境。介绍了设计制造模拟海水结冰的试验装置的方法。采用人工制冷技术在实验室环境下实现了封闭容器里海水表面冻结一定厚度的海冰。试验结果表明，将容器中接近冰点的海水持续冻结32h后，海冰的厚度达到20cm。对容器里的海冰进行了声波信号探测冰水界面的试验，为测冰声呐技术研究和测冰试验创造了有利条件。  相似文献   

Time-based signal characteristics as predictors of fish size and species for a side-looking hydroacoustic application in a river   总被引：1，自引：1，他引：1  

Burwen  Debby L; Fleischman  Steven J; Miller  James D; Jensen  Mark E 《ICES Journal of Marine Science》2003,60(3):662-668

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多通道异采样率信号同步采集问题研究     

康通博  蔡惠智  冯欣欣  何国建 《海洋技术学报》2006,25(4):103-107

网络化和构建全方位的立体作战系统将是未来声呐的发展趋势。随着网络技术和元器件技术的发展,一种称之为“网络中心战”的新型作战模式正在悄然兴起。传感器网络是整个网络中心战系统的最基础部分。A/D数据同步采集是将整个网络中的传感器信号由模拟转换为数字,这种转换应使各个通道数据的相位一致性在一定的误差范围内。论文的研究工作立足于上述网络中心战系统,研究了多通道信号异采样率同步数据采集的问题。  相似文献