Block IIF Archives - Inside GNSS

Block IIF

January 24, 2008

GPS Block IIF Satellite to Enter New Round of SMC Tests

Block IIF satellite undergoing tests at Space & Missile Systems Center, Los Angeles Air Force Base, California

Having successfully passed its initial phase of tests at the Space & Missile Systems Center at Los Angeles Air Force Base, the first GPS Block IIF (follow-on generation) satellite is expected to enter the second round of thermal vacuum testing in late March, according to the GPS Wing.

On December 24, the GPS IIF program completed the first of two phases of thermal vacuum testing on the first IIF space vehicle (SV-1) built by The Boeing Company. This was "a major success for the program," in the words of GPS Wing officials. Thermal-vac tests exposed the spacecraft to extreme hot and cold temperatures under vacuum conditions to verify system performance and correlate the thermal models, according to the GPS Wing.

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By Glen Gibbons
May 1, 2006

GPS III, Block IIF Programs Hit New Delays

The GPS program appears to be struggling on several fronts recently.

GPS III, the next-generation modernization project for the space and ground segments, is facing renewed uncertainty and possible schedule delays. At the same time, anticipated first launch of the follow-on block of satellites (Block IIF) with the new civil L5 signal has been postponed.

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By Inside GNSS