Integration of Airborne Bathymetric LiDAR and Multi-beam Echo-sounder Data for Construction of High Resolution Terrain data in Intertidal Zone

2019 ◽  
Vol 27 (2) ◽  
pp. 23-30
Author(s):  
Jae Bin Lee ◽  
Hye Jin Kim ◽  
Hyun Soo Hur ◽  
Gwang Jae Wie
Keyword(s):  
High Resolution ◽  
Intertidal Zone ◽  
Echo Sounder

Shallow Water High Resolution Multi-Beam Echo Sounder

2008 ◽  
Author(s):  
Haisen Li ◽  
Bin Yao ◽  
Tian Zhou ◽  
Yukuo Wei ◽  
Baowei Chen ◽  
...  
Keyword(s):  
High Resolution ◽  
Shallow Water ◽  
Echo Sounder

scholarly journals Obtaining High-Resolution Seabed Topography and Surface Details by Co-Registration of Side-Scan Sonar and Multibeam Echo Sounder Images

2019 ◽  
Vol 11 (12) ◽  
pp. 1496 ◽  
Author(s):  
Shang ◽  
Zhao ◽  
Zhang
Keyword(s):  
High Resolution ◽  
Template Matching ◽  
High Accuracy ◽  
Transformation Model ◽  
Base Line ◽  
Initial Image ◽  
Side Scan Sonar ◽  
Speeded Up Robust Features ◽  
Seabed Topography ◽  
Echo Sounder

Side-scan sonar (SSS) is used for obtaining high-resolution seabed images, but with low position accuracy without using the Ultra Short Base Line (USBL) or Short Base Line (SBL). Multibeam echo sounder (MBES), which can simultaneously obtain high-accuracy seabed topography as well as seabed images with low resolution in deep water. Based on the complementarity of SSS and MBES data, this paper proposes a new method for acquiring high-resolution seabed topography and surface details that are difficult to obtain using MBES or SSS alone. Firstly, according to the common seabed features presented in both images, the Speeded-Up Robust Features (SURF) algorithm, with the constraint of image geographic coordinates, is adopted for initial image matching. Secondly, to further improve the matching performance, a template matching strategy using the dense local self-similarity (DLSS) descriptor is adopted according to the self-similarities within these two images. Next, the random sample consensus (RANSAC) algorithm is used for removing the mismatches and the SSS backscatter image geographic coordinates are rectified by the transformation model established based on the correct matched points. Finally, the superimposition of this rectified SSS backscatter image on MBES seabed topography is performed and the high-resolution and high-accuracy seabed topography and surface details can be obtained.

scholarly journals Obtaining 3D High-Resolution Underwater Acoustic Images by Synthesizing Virtual Aperture on the 2D Transducer Array of Multibeam Echo Sounder

2019 ◽  
Vol 11 (22) ◽  
pp. 2615 ◽  
Author(s):  
Bo Wei ◽  
Haisen Li ◽  
Tian Zhou ◽  
Siyu Xing
Keyword(s):  
High Resolution ◽  
Detection Efficiency ◽  
Processing Scheme ◽  
Transducer Array ◽  
Underwater Acoustic ◽  
Seabed Topography ◽  
Working Parameters ◽  
Imaging Algorithms ◽  
Along Track ◽  
Echo Sounder

In recent decades, imaging sonar has been the most widely employed remote sensing instruments in the field of underwater detection. The multibeam echo sounder (MBES) plays an important role in obtaining high-accuracy seabed topography. However, the resolution of the MBES substantially decreases with the increasing distance. Synthetic aperture sonar (SAS) achieves constant resolution on the along-track, improving the fineness of the image. However, conventional side-scan SAS usually only achieves 2D images, and gaps always exist. In this modeling and experimental research paper, we propose a novel underwater acoustic imaging scheme to improve the imaging performance of MBES, based on the complementarity of MBES and SAS systems. We design a 2D transducer array to increase the detection efficiency and obtain spatial gain. Moreover, the processing scheme is analyzed to design the working parameters in actual engineering applications. We exploit a target echo simulation approach to establish the research basics of the imaging algorithms, which also reflects the shapes and shadows of targets to match actual situations as realistically as possible. The proposed imaging algorithm synthesizes a virtual aperture receiving array on the along-track and reserves the multi-element manifold on the across-track. This helps to improve the imaging quality of the MBES and achieves high-resolution 3D detection with no gaps. Simulation and tank experimental results demonstrate that the proposed scheme can significantly improve the detection ability of the MBES, especially for small 3D target detection, thus making it suitable for 3D high-resolution underwater detection applications.

scholarly journals DEVELOPING THE CONSTELLATION UNMANNED SURFACE VEHICLE PROTOTYPE

2019 ◽  
Author(s):  
R G Shaw
Keyword(s):  
High Resolution ◽  
Real Time ◽  
Unique Solution ◽  
Water Safety ◽  
Unmanned Surface Vehicle ◽  
Safety Devices ◽  
Seabed Mapping ◽  
High Resolution Images ◽  
Echo Sounder

Vessel navigation through the use of reliable nautical charts is vital to ensure safe passage. Having the ability to complement this with the ability to see accurately both what lies beneath the water and ahead of a vessel in real time provides an added dimension of safety and certainty. Combining the high value and deep draft of modern super and mega yachts with a penchant for exploration creates a tension which can test the availability and accuracy of navigation charts. The development of a 2 metre remote-operated and autonomous-capable surface vehicle with ultra-high-resolution echo-sounder capability provides a unique solution which can open up considerable exploration capability. The ability to produce ultra-high-resolution images and relay these back to the mother vessel in real time enables precise seabed mapping, providing safer navigation. Additionally, it has the capability to deploy personal water-safety devices in situations such as a man-overboard incident.

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