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Scientists plot sea levels using GPS satellites
Accurate sea level measurements are more critical than ever, but there are a limited number of radar satellites designed for that purpose. However, a team from the UK's National Oceanography Centre (NOC), University of Michigan and NASA's Jet Propulsion Laboratory have discovered a new way to do so using much cheaper and more plentiful GPS satellites. The technique is called GNSS-R, and involves bouncing low-powered signals from GPS satellites off of the ocean's surface and measuring the reflected signal with a GNSS-R receiver. That lets the sat-nav constellation act as a type of distance-measuring radar without disrupting its regular job -- guiding cars and airplanes.
