Communications

On land in the digital age, it’s easy to take communications for granted. Images and videos are easily streamed on portable devices, the internet is wirelessly available more often than not, and finding an address only requires a GPS enabled smart phone. Once a few miles offshore though, everything changes. There are no wifi hotspots and there is no cellular network. In order for people or robots to communicate back to land, satellite communications are typically used. Satellite communications are typically more expensive and carry less data than typical land-based networks. Thus certain strategies must be employed by devices that are designed to operate. For instance, a mooring collecting high resolution water current data might use onboard processing to send just a summary back to shore while awaiting a higher speed link like a ship or surface robot to occasionally come close enough to allow for a full resolution data download. Once under the surface of the water, communications become even more difficult. Radio Frequency (RF) waves don’t propagate underwater so things like satellite modems or GPS receivers won’t work. A number of different communications techniques can be applied underwater using optical or electromagnetic sensors. By far the most common technique uses acoustic sound waves that are modulated to send data between modems much like early Hayes styles analog modems used with home computers. This style of communication is even more limiting in bandwidth and uses much more energy per byte than RF communications. Various acoustic techniques can be used to aid in navigation of mobile underwater platforms like autonomous underwater vehicles (AUVs) and moored platforms can make use of acoustic communications to send critical data up to the surface. For example a seismometer mounted on the seafloor can limit its communication to just seismic events of interest.

Wave Glider-based communications hotspot

One of the major themes of MBARI’s current research is the increasing dependence on real-time data for informed decision-making during the course of field experiments.

Aerostat hotspot

This balloon-borne radio relay has the potential to provide “over-the-horizon” communications much more inexpensively than satellites.

Technology

Solving challenges
Taking the laboratory into the ocean
In Situ Ultraviolet Spectrophotometer
Midwater Respirometer System
Mobile flow cytometer
Enabling targeted sampling
Automated Video Event Detection
Gulper autonomous underwater vehicle
Advancing a persistent presence
Aerostat hotspot
Benthic event detectors
Benthic rover
Fault Prognostication
Long-range autonomous underwater vehicle Tethys
Marine “soundscape” for passive acoustic monitoring
Monterey Ocean-Bottom Broadband Seismometer
Shark Café camera
Vehicle Persistence
Wave Glider-based communications hotspot
Emerging and current tools
Communications
Aerostat hotspot
Wave Glider-based communications hotspot
Data management
Oceanographic Decision Support System
Spatial Temporal Oceanographic Query System (STOQS) Data
Video Annotation and Reference System
Instruments
Apex profiling floats
Benthic event detectors
Deep particle image velocimetry
Environmental Sample Processor
How the ESP Works
Genomic sensors
ESP Web Portal
The ESP in the news
Investigations of imaging for midwater autonomous platforms
Lagrangian sediment traps
Laser Raman Spectroscopy
Midwater Respirometer System
Mobile flow cytometer
Smart underwater connector
Power
Wave-Power Buoy
Vehicle technology
Benthic Rover
Gulper autonomous underwater vehicle
Imaging autonomous underwater vehicle
In Situ Ultraviolet Spectrophotometer
Seafloor mapping AUV
Long-range autonomous underwater vehicle Tethys
Mini remotely operated vehicle
ROV Doc Ricketts
ROV Ventana
Video
Automated Video Event Detection
Deep learning
SeeStar Imaging System
Shark Café camera
Video Annotation and Reference System
Technology publications
Technology transfer