Global navigation satellite systems (GNSS), specifically satellite-based position, navigation and timing (PNT) constellations have been available for decades. The U.S. Department of Defense (DoD) started fielding the first GNSS, Global Positioning System (GPS), in 1973 to facilitate precision guidance for targeting and delivery of munitions. GPS has since moved well beyond military use, becoming a ubiquitous part of the global environment. Governments, people, economies, and infrastructures are all fully intertwined with satellite PNT. At the same time, military, economic, and scientific experts are aware of the Achilles Heel that will always plague the system – simple interference through jamming, spoofing or meaconing. Is it time for another navigation option?
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