
SeaTag-GEO Sensors
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First Solar Powered Geomagnetic Archival Fish Tag
In 2007 Desert Star Systems proposed to the National Ocean
and Atmospheric Administration (NOAA) that they would develop a line of
micro-observation stations, called SeaTag. In NOAA's solicitation for an
"archival tag for a wide range of migratory marine animal sizes" they
called out a few key requirements. They specifically mentioned that current
tags “are expensive and rather large, limited in the parameters they can
collect, have restricted data storage, and pop-off attachment/release
mechanisms currently limit time at liberty to less then one year.” They
also stated, “Current geolocation mechanisms in subsurface ecosystems using
light provide wide estimates of latitude and longitude.”
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Desert Star jumped at the opportunity to develop innovative new tag designs for
NOAA. Their first tag, SeaTag-GEO, is a small geo-positioning only archival tag.
It has many unique features that make it completely different from other
archival tags being manufactured. For starters, the tag uses a solar cell to
charge an aerogel capacitor; it uses no batteries in this configuration. The
tag also has no external connector; it uses a docking station to send and
retrieve data. When placed in the docking station, the tag receives information
through the solar cell and sends data through a built-in antenna (RF).
Finally, SeaTag-GEO uses a 3-axis magnetometer to acquire magnetic field
strength data from the Earth. The total strength of the Earth's magnetic
field is well characterized, and in most parts of the planet varies
distinctively with latitude. Thus, SeaTag replaces length-of-day based
latitude estimation with simple and reliable magnetometer readings; a method
that works independently of cloud cover, water turbidity, and season (for
example, equinoxes).
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Geomagnetic Accuracy Estimations
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Desert Star Systems
3261 Imjin Road · Marina, CA 93933
831-384-8000 · salesinfo@desertstar.com
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12/1/2008 - SeaTag: A Family of Micro-Observation Stations
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