Second GPS IIF Satellite Finally Set Healthy
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The second GPS Block IIF satellite, SVN63/PRN01, was finally set healthy on October 14, and a corresponding Notice Advisory to Navstar Users (NANU) has been issued. The delay in bringing the satellite into service was due, in part, to extended testing of the cesium atomic frequency standard (AFS) on the satellite. IIF satellites carry three AFSs: one cesium and two rubidiums. The performance of the cesium AFS, independently confirmed, was poor. A switch to one of the rubidium AFSs took place on October 5. The satellite was launched in July, and operational control was handed over to the Air Force 2nd Space Operations Squadron (2 SOPS) at Schriever Air Force Base, Colorado, on August 19. »read more
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