A couple of years ago, I surveyed the origins of the GPS system in a Sputnik-inspired satellite navigation system that operated using Doppler shift measurements of satellite signals. The TRANSIT or NAVSAT system yielded 100m – 400m location accuracy (accounts vary). The system included several firsts: the first nuclear powered satellite […]
NAVSAT
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With the launch and tracking of Sputnik in 1957, it soon became obvious that the location of the satellite could be tracked by monitoring its Doppler shift. Frank McClure persuaded fellow researchers at Johns Hopkins Applied Physics Lab to devise a satellite navigation and positioning system based on the Doppler […]