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无源雷达本身不发射电磁波,而是利用广播、电视外部信号作为辐射源照射目标来估计出目标位置并以此来跟踪目标。因为雷达自身不需要发射信号而是利用外来辐射信号探测目标,无源雷达可以大大提高雷达的生存能力。
Passive radar itself does not emit electromagnetic waves, but the use of radio and television external signal as a radiation source to target to estimate the target position and thus to track the target. Because the radar itself does not need to launch the signal but the use of external radiation signals to detect targets, passive radar can greatly improve the viability of the radar.