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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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