GPS Satellite Glitches Fuel Concern on Next Generation - WSJ.com: "Technical problems are degrading the accuracy of signals from the last GPS satellite launched by the Pentagon, sparking concerns among U.S. military and aerospace industry officials that the next generation of the widely used satellites could face similar troubles."
GPS is using these downlink frequencies:
1227.6 MHz
1381.05 MHz
1575.42 MHz
2227.5 MHz
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