In response the Soviet Union also developed and deployed similar Global Navigation Satellite Systems (GNSS): Tsikada and GLONASS. The focus of these programs was to provide the military forces of the US and its allies with precise positioning capabilities. First the Transit satellites were deployed, then the Timation and finally the NAVSTAR GPS system.
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This concept was implemented in a series of satellites sponsored and operated by the US Armed Forces. satellite, then it should also be possible to use the signal transmitted by a satellite in a known orbit in order to determine your own position. This article outlines some of the basic concepts involved and presents the activities that the European Space Operations Centre is carrying out in the field of satellite navigation using GPS. A GPS receiver on-board a spacecraft can provide the means for autonomous navigation and it also allows a very accurate reconstitution of the trajectory of the spacecraft when on-board recorded measurements are combined with ground based measurements. Very soon the idea of using the inverse process was developed: if by knowing your position you could determine the orbit of the The Global Positioning System (GPS) is currently being used for a wide variety of applications. Dow Orbit Attitude Division, European Space Operations Centre (ESOC), Darmstadt, Germany Introduction The launch of the first Sputnik triggered the first challenge in satellite navigation, the determination of the characteristics of the orbit of the satellite, using the variations in the signal that was being radiated by the satellite.
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