Beskrivning : The Transit spacecraft were developed for updating the inertial navigation systems on board US Navy Polaris submarines, and later for civilian use. Transit receivers used the known characteristics of the satellite`s orbit, measured the Doppler shift of the satellite`s radio signal, and thereby calculated the receivers position on the earth. Individual Transit satellites operated for over 10 years.
Transit was superseded by the Navstar global positioning system. The use of the satellites for navigation was discontinued at the end of 1996 but the satellites continued transmitting and became the Navy Ionospheric Monitoring System (NIMS).

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