Results 31 to 40 of about 12,636 (256)

A Torpedo Target Recognition Method Based on the Correlation between Echo Broadening and Apparent Angle

open access: yesApplied Sciences, 2022
As acoustic decoys can simulate the scale of the target through orderly control of the echo delay, simulated acoustic decoys have scale characteristics similar to those of the scaled target.
Zirui Wang   +4 more
doaj   +1 more source

MGFGNet: an automatic underwater acoustic target recognition method based on the multi-gradient flow global feature enhancement network

open access: yesFrontiers in Marine Science, 2023
The recognition of underwater acoustic targets plays a crucial role in marine vessel monitoring. However, traditional underwater target recognition models suffer from limitations, including low recognition accuracy and slow prediction speed.
Zhe Chen   +6 more
doaj   +1 more source

Nonlinear time-warping made simple: a step-by-step tutorial on underwater acoustic modal separation with a single hydrophone [PDF]

open access: yes, 2020
© The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Bonnel, J., Thode, A., Wright, D., & Chapman, R.
Bonnel, Julien   +3 more
core   +1 more source

Automatic target recognition of surface vessels in passive sonar using emerging technologies of artificial intelligence and deep learning [PDF]

open access: yesآینده‌پژوهی دفاعی, 2023
Objective: Artificial intelligence is a part of computer science that emphasizes the creation of intelligent machines in defense equipment and military equipment.
hassan akbarian   +1 more
doaj   +1 more source

Comment on “Temporal and spatial variation in harbor seal (Phoca vitulina L.) roar calls from southern Scandinavia” [J. Acoust. Soc. Am. 141, 1824-1834 (2017)] [PDF]

open access: yes, 2018
In their recent article, Sabinsky and colleagues investigated heterogeneity in harbor seals' vocalizations. The authors found seasonal and geographical variation in acoustic parameters, warning readers that recording conditions might account for some of ...
Ravignani, A.
core   +2 more sources

Wireless recording of the calls of Rousettus aegyptiacus and their reproduction using electrostatic transducers [PDF]

open access: yes, 2008
Bats are capable of imaging their surroundings in great detail using echolocation. To apply similar methods to human engineering systems requires the capability to measure and recreate the signals used, and to understand the processing applied to ...
D A Waters   +13 more
core   +1 more source

Underwater Target Recognition Based on Dynamic Ensemble of Random Forest

open access: yes水下无人系统学报
Accurate recognition of the target is the key to attacking enemy for underwater acoustic homing weapon. A real-time target recognition method for underwater acoustic homing weapon was proposed based on dynamic ensemble selection technology.
Tao CAO   +3 more
doaj   +1 more source

Marine Wireless Big Data: Efficient Transmission, Related Applications, and Challenges

open access: yes, 2017
The vast volume of marine wireless sampling data and its continuously explosive growth herald the coming of the era of marine wireless big data. Two challenges imposed by these data are how to fast, reliably, and sustainably deliver them in extremely ...
Jiang, Tao   +3 more
core   +1 more source

An Underwater SLAM System using Sonar, Visual, Inertial, and Depth Sensor

open access: yes, 2019
This paper presents a novel tightly-coupled keyframe-based Simultaneous Localization and Mapping (SLAM) system with loop-closing and relocalization capabilities targeted for the underwater domain.
Li, Alberto Quattrini   +2 more
core   +1 more source

On-Site Calibration-Based Estimation Method of Forward Seabed Elevation Using Forward Scan Sonar [PDF]

open access: yes, 2019
This paper addresses a novel calibration-based estimation method to measure the forward seabed elevation (FSE) where an area illuminated by forward scan sonar (FSS) for unmanned underwater vehicles (UUVs).
CHO, HYEONWOO   +2 more
core   +1 more source

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