Cortex-M3 and TMS320C6416 Based Acoustic Modem Implementation for Underwater Wireless Communication

2012 ◽  
Author(s):  
Dong-Soo Lee ◽  
Sae-Hee Hwangbo ◽  
Jun-Ho Jeon ◽  
Sung-Joon Park
Keyword(s):  
Wireless Communication ◽  
Underwater Wireless Communication ◽  
Acoustic Modem

High-Bandwidth Underwater Wireless Communication Using a Swarm of Autonomous Underwater Vehicles

2019 ◽  
Author(s):  
Alexandre Immas ◽  
Mohsen Saadat ◽  
Jesus Navarro ◽  
Matthew Drake ◽  
Julie Shen ◽  
...  
Keyword(s):  
Wireless Communication ◽  
Autonomous Underwater Vehicles ◽  
Underwater Vehicles ◽  
Optical Signal ◽  
Image Processing Technique ◽  
Communication Link ◽  
Water Tank ◽  
Long Distance ◽  
High Bandwidth ◽  
Underwater Wireless Communication

Abstract We present a new method for underwater wireless communication with high bandwidth and over long distance. A swarm of Autonomous Underwater Vehicles (AUVs) is used to relay an optical signal between two points at any distance. Each vehicle is equipped with multiple attitude stabilization systems to reach the required pointing and tracking accuracy for optical communication. This technology would enable fast and efficient underwater exploration which is highly needed as only 5% of the world’s oceans have been explored so far. We carried out an experimental proof of concept to show that it is possible to relay an optical signal underwater between two points using a swarm of AUVs. The experiment took place in a 2m deep water tank. We modified and controlled two submarine models to reflect the laser beam stemming from a laser pointer at the bottom of the tank to the desired location. To know their positions, we developed an image processing technique which required the setup of a RF communication link at 315Mhz between the computers processing the camera’s videos and the units.

scholarly journals Performance analysis of patch antenna for underwater wireless communication in seawater

2021 ◽  
Vol 22 (2) ◽  
pp. 857
Author(s):  
Siti Harliza Mohd Razali ◽  
Razali Ngah ◽  
Yoshihide Yamada ◽  
Kamilia Kamardin
Keyword(s):  
Wireless Communication ◽  
Patch Antenna ◽  
Free Space ◽  
Path Loss ◽  
Simulation Software ◽  
Rectangular Patch ◽  
Seawater Environment ◽  
The Difference ◽  
The One ◽  
Underwater Wireless Communication

<span lang="EN-US">Underwater wireless communication in seawater is becoming more interesting and challenging in recent years. The development of antenna for underwater wireless communication in seawater at 900 MHz UHF range frequency is implemented by using patch antenna. In this paper, the antennas were designed using FEKO, an electromagnetic simulation software, and a suitable size for rectangular patch antenna for seawater application was developed to study the relevance between λ0 with W and L in seawater. The difference between the patches in free space and seawater was the L size, which was slightly bigger, about 0.9 mm, than free space size. But the gain for patch antenna in seawater was found at -2.51 dBi, lower than patch antenna in free space, which was 5.76 dBi due to the path loss in seawater. This shows that attenuation happened, and a better antenna will be design. The one that has better gain, which is around above 2 dBi in seawater, in order to get better performance antenna in seawater environment.</span>

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