Results 81 to 90 of about 1,151,241 (199)

Improved Chirp Scaling Algorithm for Processing Squinted Mode Synthetic Aperture Sonar Data

Cybernetics and Information Technologies, 2016
The conventional Chirp Scaling Algorithm is mainly used in side looking or small squint angle mode of synthetic aperture imaging. In application of synthetic sonar, the large squint angle imaging is often required and the range-azimuth coupling is ...
Fan Naiqiang, Wang Yingmin, Lv Yarong
doaj   +1 more source

Size constancy in bat biosonar? [PDF]

, 2013
Perception and encoding of object size is an important feature of sensory systems. In the visual system object size is encoded by the visual angle (visual aperture) on the retina, but the aperture depends on the distance of the object. As object distance
Heinrich, Melina, Melina Heinrich, Heinrich Melina, Wiegrebe, L., Heinrich, M., Wiegrebe Lutz, Wiegrebe, Lutz, Lutz Wiegrebe   +7 more
core   +2 more sources

Introduction to Synthetic Aperture Sonar

, 2011
None
openaire   +3 more sources

Digital Beamforming on Receive: Techniques and Optimization Strategies for High-Resolution Wide-Swath SAR Imaging [PDF]

, 2009
Synthetic Aperture Radar (SAR) is a well-proven imaging technique for remote sensing of the earth. However, conventional SAR systems are not capable to fulfill the increasing demands for im-proved spatial resolution and wider swath coverage.
Alberto Moreira, Moreira, Alberto, Nicolas Gebert, Gebert, Nicolas, Krieger, Gerhard, Gerhard Krieger   +5 more
core   +1 more source

An experimental test of endfire synthetic aperture sonar for sediment characterisation

IET Radar, Sonar & Navigation
The validation of seafloor scattering models used for seabed characterisation requires quantifying the contributions from the sediment interface and volume to the total acoustic returns.
Shannon‐Morgan Steele, Anthony P. Lyons   +1 more
doaj   +1 more source

A High-Accuracy Underwater Object Detection Algorithm for Synthetic Aperture Sonar Images

Remote Sensing
Underwater object detection with Synthetic Aperture Sonar (SAS) images faces many problems, including low contrast, blurred edges, high-frequency noise, and missed small objects.
Jiahui Su, Deyin Xu, Lu Qiu, Zhiping Xu, Lixiong Lin, Jiachun Zheng   +5 more
doaj   +1 more source

Synthetic aperture sonar

The Journal of the Marine Acoustics Society of Japan, 1999
YAMAGUCHI, Isao, KATO, Jun'ichi
openaire   +3 more sources

Occlusion and height estimation using the coherence of multi-static synthetic aperture sonar images [PDF]

JASA Express Letters
Objects in synthetic aperture sonar imagery that lie proud above an interface will occlude a portion of the background behind it. This occlusion may appear as a shadow in the imagery whose dimensions can be used to infer the height of the object.
Thomas E. Blanford
doaj   +1 more source

Three-Dimensional Reconstruction Method of Submarine Cables Based on High-Speed ROV Cruising with Multibeam Imaging Sonar

水下无人系统学报
Submarine cables, serving as the critical conduits for power transmission for offshore wind farms, are pivotal to the system’s stability. However, due to their complex marine environments, currently, conventional three-dimensional(3D) reconstruction ...
Haining XU, Yong WANG, Qiang JING, Tongzhen DING, Fei YU, Qingye SHEN, Shengzhe CAO   +6 more
doaj   +1 more source

Automatic Target Recognition in Synthetic Aperture Sonar Images Based on Geometrical Feature Extraction

EURASIP Journal on Advances in Signal Processing, 2009
This paper presents a new supervised classification approach for automated target recognition (ATR) in SAS images. The recognition procedure starts with a novel segmentation stage based on the Hilbert transform.
J. Del Rio Vera, E. Coiras, J. Groen, B. Evans   +3 more
doaj   +1 more source