Researcher uses a Global Positioning Receiver

Researcher uses a Global Positioning Receiver

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Credit: DAVID VAUGHAN/SCIENCE PHOTO LIBRARY

Caption: Antarctic expedition. Antarctic researcher uses a Global Positioning System (GPS) receiver to obtain a measurement of his position as the weather worsens. The receiving antenna is on a tripod, whilst a De Havilland Twin Otter aircraft waits in the background. The receiver calculates the user's position by measuring the time it takes for signals to arrive from GPS satellites at different points of the sky. By combining many readings the receiver's position may be fixed to within a few centimetres. Photograph of a Trimble 4000 SSE GPS receiver.

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Keywords: antarctic research, antarctica, de havilland twin otter, environment, global positioning, gps receiver, trimble 4000 sse gps receiver

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