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Some good news for GPS 3, but trouble looms - SpaceNews.com Dec 2017
"As 2017 winds down, the GPS 3 constellation finally has a string of victories for the Air Force to celebrate. The first satellite is on track for a 2018 launch. The digital navigation payload has been fixed after earlier setbacks, and units are in production. And the ground-control software is starting to recover from years of schedule delays.... But there’s also bad news. Government auditors have warned that the GPS 3 program increasingly is becoming harder to manage because of the complexity and scope of the upgrades required to military weapon systems to receive the encrypted signals. The satellites might be up and running by 2021 but it could take many more years to get the ground infrastructure and equipment terminals in synch with the new satellites."
SpaceNews  GPS  USAF  satellite  navigation 
january 2018 by pierredv
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