Results 41 to 50 of about 48,682 (230)

System locates randomly placed remote objects [PDF]

, 1966
System to locate objects submerged underwater uses active/passive sonar techniques in which a transmitter is attached to the object to be recovered and a receiver is used for search.
Lovelady, R. W., Mc Fall, J. C., Jr.
core   +1 more source

Recent advances in multifunctional soft robots: A materials–structures–systems co‐design perspective for synergistic integration

FlexMat, EarlyView.
Abstract Soft robots, engineered from highly compliant materials, offer superior adaptability and safety in unstructured environments compared to their rigid counterparts. Recent advancements, fueled by bio‐inspiration and material programmability, have led to the rapid co‐evolution of their core modules: actuation, sensing, protection, energy, and ...
Qiulei Liu, Zicao Peng, Chong Sun, Haitao Yang   +3 more
wiley   +1 more source

Calculation Method for UKF Target Motion Elements Based on Detection Information of Active and Passive Sonars

水下无人系统学报
The target motion element is important information in anti-submarine warfare, and its calculation results have a great influence on the hitting probability of the target, thus affecting combat decision-making.
Hongrui ZHANG, Jun SU, Qian LI, Bin LI, Xiaoming KOU   +4 more
doaj   +1 more source

The limits of spatial resolution achievable using a 30kHz multibeam sonar: model predictions and field results [PDF]

, 1998
A Simrad EM300 multibeam sonar was used to attempt to resolve small (-5m high) targets in 450m of water. The targets had previously been surveyed using a deeply towed 59 kHz sidescan sonar.
Gardner, James V., Hughes Clarke, John E., Mayer, Larry A., Torresan, Mike   +3 more
core   +1 more source

Efficient Approach for OS-CFAR 2D Technique Using Distributive Histograms and Breakdown Point Optimal Concept applied to Acoustic Images [PDF]

, 2019
In this work, a new approach to improve the algorithmic efficiency of the Order Statistic-Constant False Alarm Rate (OS-CFAR) applied in two dimensions (2D) is presented.
Acosta, Gerardo Gabriel, Menna, Bruno Victorio, Torcida, Sebastián, Villar, Sebastian Aldo   +3 more
core   +2 more sources

Seabed classification in the Gulf of Alaska from acoustic surveys using deep learning

Limnology and Oceanography: Methods, EarlyView.
Abstract High‐resolution mapping of seafloor habitats has wide applications for fisheries, conservation efforts, offshore infrastructure planning, mineral extraction, and scientific modeling. This study leverages existing widespread single‐beam acoustic data and machine learning to create habitat maps for the Gulf of Alaska at a spatial resolution of ...
Karuna Agarwal, Christopher N. Rooper, Kresimir Williams   +2 more
wiley   +1 more source

Attention-Based Complementary Learning for Active Target Classification With Limited Sonar Data

IEEE Access
We propose an active sonar target classifier using attention-based complementary learning (ABCL) to mitigate poor generalization with scarce active sonar data.
Youngsang Hwang, Geunhwan Kim, Sungjin Shin, Wooyoung Hong, Youngmin Choo   +4 more
doaj   +1 more source

PHD and CPHD Algorithms Based on a Novel Detection Probability Applied in an Active Sonar Tracking System

Applied Sciences, 2017
Underwater multi-targets tracking has always been a difficult problem in active sonar tracking systems. In order to estimate the parameters of time-varying multi-targets moving in underwater environments, based on the Bayesian filtering framework, the ...
Xiao Chen, Yaan Li, Yuxing Li, Jing Yu
doaj   +1 more source

Study on Underwater Target Tracking Technology Based on an LSTM–Kalman Filtering Method

Applied Sciences, 2022
In the marine environment, underwater targets are often affected by interference from other targets and environmental fluctuations, so traditional target tracking methods are difficult to use for tracking underwater targets stably and accurately.
Maofa Wang, Chuzhen Xu, Chuanping Zhou, Youping Gong, Baochun Qiu   +4 more
doaj   +1 more source

Performance of a glider‐mounted multifrequency echosounder for measuring the vertical distribution and abundance of large pelagic copepods

Limnology and Oceanography: Methods, EarlyView.
Abstract The difficulty of sampling zooplankton communities in situ has driven advancements in autonomous, remote sensing technology. The goal of this paper was to perform a gear comparison study testing the performance of one such piece of technology—a glider‐mounted four‐frequency echosounder—against traditional shipboard methods of measuring ...
Delphine Mossman, Joseph D. Warren, Natasha J. Hynes, Kimberley T. A. Davies   +3 more
wiley   +1 more source