High Bandwidth Wireless Communication for Seafloor Data

Recovery and Vehicle Control

Norm FarrWoods Hole Oceanographic Institution

Woods Hole, MA

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Observatory Telemetry

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Wireless Data Recovery from Surface Vessel

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Wireless Data Recovery via AUV (Data Mule)

Acoustic vs Optical Comparison

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Optical AcousticData rate 10Mbps 5KbpsRange 150 meters KmLatency micro seconds msec to secEfficiency 300k bits/J 1k bits/J

Optical Modem

Long range, deep water system Scalable transmitters 10Mbps rate, 150m range 300Kbits/Joule

Silicon based transceiver for full daylight operation

5Mbps rate, 10-20 m range

Commercially available through Lumasys Inc.

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REMUS 600REMUS 2500 REMUS 6000

REMUS AUVS

Diameter Length Weight Top Speed Endurance Range(Inches) (Inches) (pounds) (knots) (Hours) (km)

100 7.5 60 to 84 60 to 100 4.5 8 50600 12.75 120 to 180 450 to 650 4.5 40 250

2500 14 156 725 4 30 1806000 26 156 1900 3.8 24 125

REMUS AUV SPECIFICATIONS

REMUS 100

REMUS 2500REMUS 600 REMUS 6000

Wireless (optical) data transfer from seafloor instrument to surface vessel

2500m water depthJuan de Fuca ridge

DP ship, USBL navigation

Optical Telemetry System for CORK seafloor observatory

Large file transfers

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Range (meters) Data transfer rate (mbps)

108 1, 5, 10118 1,5128 1,5138 1

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Emission profile of transmitters

10 degree half angle

LambertianToroidal

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Location e-folding length (Meters)

Data rate (Mbps)

Range (Meters)

WHOI dock 1 1 40Bermuda (large area receiver)

40 1, 5 300, 200

New England shelf break

4.5 1 75

Juan de Fuca ridge 20 1, 5, 10 138, 118, 108Guam 40 10 140GOM MC118 (1000M depth)

20 5 75 operational

Varying turbidity, rate, and range

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Untethered ROV

High bandwidth optical uplink Low latency bidirectional command and control

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Summary

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• High bandwidth communications for large data file offload

• Video transmission• Low latency for vehicle control• Technology is available commercially

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