The U.S. Air Force continues to rely on the legacy rubidium clocks included in the GPS IIF satellites manufactured by Boeing—rather than newer cesium atomic clocks—as they prepare to launch the 8th in this series of precision navigation and timing spacecraft. GPS IIF-8 is slated for launch Oct. 29 from Cape Canaveral Air Force Station, Florida., on a United Launch Alliance Atlas V 401 (with a 4-meter fairing). The rubidium clocks are providing "very good performance," ...

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