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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Vaughan, David |
Bildgröße: | 2200 px × 3241 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |