A Glimpse into the Future of GPS? The latest in a series of test satellites that has advanced the art of space-based navigation is being planned by the U.S. Air Force in a bid to make GPS more resilient in contested environments. The third Navigation Technology Satellite (NTS-3) is planned for launch in 2022 and will follow NTS-1 in 1974 and NTS-2 in 1977, which qualified the rubidium and cesium clocks that form the backbone of GPS. Faced with the certainty GPS will be degraded or denied ...

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