under water wireless communication very beginning

8/11/2019 Under Water Wireless Communication Very Beginning

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Underwater Wireless

Communication# Methods

#State-of-the-art#Challenges#Application

# Available Products


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Methods of UnderwaterWireless Communication

1) Radio frequency (30Hz-300Hz, very highattenuation)2) Optical (short distance, pointing precision)3) Acoustic wave (offers long transmissionranges of up to 20 km)


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RF

Advantages: Crosses air/water/seabed boundaries easily Prefers shallow water Unaffected by turbidity, salinity, and pressure gradients Works in non -line-of-sight; unaffected by sediments and aeration

Immune to acoustic noise High bandwidths (up to 100 Mb/s) at very close range

Disadvantages: Susceptible to Electromagnetic Interference Limited range through water


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Optical

Advantages: Ultra-high bandwidth: gigabits per second Low cost

Disadvantages: Does not cross water/air boundary easily Susceptible to turbidity, particles, and marine fouling

Needs line-of-sight Requires tight alignment of nodes Very short range


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AcousticAdvantages:

Proven technology Range: up to 20 km Strong reflections and attenuation when transmitting throughwater/air boundary

Adversely affected by turbidity, ambient noise, salinity, andpressure gradients

Disadvantages: Limited bandwidth (0 b/s to 20 kb/s)

Impact on marine life Poor performance in shallow water

[both acoustic and optical waves cannot perform smooth

transitions through the air/water interface]


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State-of-the-ArtThe term " state of the art " refers to the highest level of general development,

as of a device, technique, or scientific field achieved at a particular time. Italso refers to the level of development (as of a device, procedure, process,technique, or science) reached at any particular time as a result of thecommon methodologies employed.How ought science be communicated to non-expert audiences? What are the

obligations of scientists and science communicators? What normativeprinciples or standards should be respected in this sphere?These questions were raised at the third Iowa State University SummerSymposium on Science Communication in the summer of 2013. In the courseof organizing and conducting this event, it became increasingly clear that

while scholarship on these overlooked ethical issues is growing, it remainsscattered and on the periphery of science communication scholarship. As aresult, the decision was made to pursue the creation of a theoreticallyinformed collected volume on science communication ethics as a means toextend and share this work with audiences in science communication studies,science communication practice, science and technology studies, and thebroader scientific and science policy communities.


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ChallengesNetwork Challenges Scarce spectrum

Demanding/diverse applications Reliability Ubiquitous coverage Seamless indoor/outdoor operation Propagation characteristic:

Device Challenges Size, Power, Cost Multiple Antennas in Silicon Multiradio Integration Coexistance


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Application

1. Sonar

2. Underwater communication

3. Underwater Navigation and Tracking4. Seismic e xploration

5. Weather and climate observation

6. Oceanography7. Marine biology

8. Particle physics


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Available ProductsWireless communication systems:1) Underwater tranceiver Wireless ultrasonic unit DIGITAL driver for vocal message equalization Automatic system for activating transmission (DAT) Double transceiver channel Automatically activated once submerged in water, receiving also automatic System type H-SSB

2) Underwater tranceiver with volume control Main technical characteristics: 1500 ft / 500 m range 25 hrs autonomy in standby mode Adjustable volume Rubber surface treatment for reduction of micro-bubbles adhesion

3) Underwater stereo tranceive Twin speaker headset connected to main unit by cable& waterproof connector Main unit includes incorporated stainless steel clip May be used under suit hood or with OCEAN REEF diving H08 helmet 1500 ft / 500 m range 25 hrs autonomy in standby mode Adjustable volume Rubber surface treatment for reduction of micro-bubbles adhesion


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4) Surface tranceiver (with battery tester) 650ft / 200m range Headphone connection Volume control Loudspeaker Water resistant case w/ pressure compensation valve Battery charger Connector and cable for external 12v DC source Transducer cable bag Available accessories:

Audio out cable Headphones

5) External amplifier or recorder Connection between surface units Works with M105 Digital &M105 Digital DC

6) 3in1 unit : an underwater communication unit capable of operatingwireless/hardwired or interfaced with a VHF radio. 3 units in one. If the unit isconnected to the surface unit via cable, then communication is on full duplexwith the surface unit (no need to press the transceiver button tocommunicate). At the same time, the unit is capable of communicating withother wireless underwater units such as the OCEAN REEF GSM G.divers, M100G.divers etc.


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8) Underwater Transceiver & VHF Controller Both Ultrasonic and VHF communication can work simultaneously On surface VHF automatically activates May use various VHF models

Waterproof carrying bag may be connected in various positions Waterproof connectors allow diver to separate mask/com unit from VHF No need to press buttons to switch from ultrasonic to VHF All communication done with Neptune on Each system has completely independent power source

9) Communications Damper10) Neptune Adjustable Communication Suppor Installed on left side of visor on mask Prevents the communication unit from hanging off the mask strap Allows mask strap to easily slide through buckle Can be adjusted for tilt and distance between the communication unit and visor All GSM models must be used with NACS


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Hardwired Communication Equipment 1) Full Duplex Communication2) Communication Connector

3) Underwater Cell Phone

Specialty Audio & Video Equipment 1) Underwater Camera Receiving Unit

Presented by: Musbiha Binte WaliStd id: 0906022Date of Submission: 18/08/2014

under water wireless communication very beginning

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