Global Positioning System (GPS) The NAVSTAR Global Positioning System(GPS) program was initiated in 1973 through the combined efforts of the US Army, the US Navy and the us air Force The new system, designed as an all-weather, continuous global radio-navigation system was developed to replace the old satellite navigation system, TRANSIT, which was not capable of providing continuous navigation data in real time on a global basis 卫星定位技术与方法——袁林果 2005-2-25 TRANSIT System Researchers at Johns Hopkins observed Sputnik in 1957. Noted that the Doppler shift provided closest approach Developed a satellite system that achieved accurate positionin Called TRANSIT and provided basic ideas behind GPS 卫星定位技术与方法—袁林果 2005225(84 卫星定位技术与方法——袁林果 2005-2-25 7 Global Positioning System (GPS) Global Positioning System (GPS) • The NAVSTAR Global Positioning System (GPS) program was initiated in 1973 through the combined efforts of the US Army, the US Navy, and the US Air Force. • The new system, designed as an all-weather, continuous, global radio-navigation system was developed to replace the old satellite navigation system, TRANSIT, which was not capable of providing continuous navigation data in real time on a global basis. 卫星定位技术与方法——袁林果 2005-2-25 8 TRANSIT System z Researchers at Johns Hopkins observed Sputnik in 1957. z Noted that the Doppler shift provided closest approach to earth. z Developed a satellite system that achieved accurate positioning z Called TRANSIT and provided basic ideas behind GPS