The proposal builds on the team’s proven record of providing progressively advanced spacecraft for the current GPS constellation: the team designed and built 21 Block IIR satellites for the Air ...

Also, using two civilian signals means GPS III can directly detect and correct ionospheric errors. The GPS III constellation is projected to be fully capable in June 2023, when 10 Block IIIA ...

For example, the Air Force launched the first GPS satellite with an anti-jam military signal in 2005 and now has 10 in orbit, but Defense does not plan to field receivers capable of picking up ...