China researchers are developing passive radar systems—sometimes nicknamed “ghost radar”—that detect aircraft by listening to reflections from existing radio signals (TV, radio, cellular), rather than emitting their own radar pulses. Because passive radar doesn’t transmit, it’s harder to detect and can help track stealth aircraft. Claims that this technology could make a military “completely invisible” are overstated. In practice, passive radar is one tool among many, with limitations in coverag
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