WASHINGTON — TrustPoint, a Virginia-based startup developing a network of navigation satellites in low Earth orbit, said it has successfully transmitted time and tracking signals from a ground station to a spacecraft in orbit, marking a key step in its effort to build a GPS-independent system.

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Sandra Erwin writes about military space programs, policy, technology and the industry that supports this sector. She has covered the military, the Pentagon, Congress and the defense industry for nearly two decades as editor of NDIA’s National Defense...