WASHINGTON — HawkEye 360 says it has demonstrated that commercial satellites built to monitor radio-frequency signals on Earth can be retasked to detect and identify transmissions from other spacecraft, potentially giving the U.S. Space Force another way to determine what satellites are doing in orbit.

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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...