Passive Radar

Passive radar is when the EM signature pick up by the radar is not due to transmit signals by the radar itself, rather by other EM emitters such as TV station, Cellular base station, radio station, etc.

In other words, in the absence of actively sending EM signals and waiting for echo, the passive radar search for change in the EM signature in the vicinity of the passive radar and detects and perhaps identify the target of interests.

This technique requires much better receiver sensitivity to detect EM signals and process that incoming signals and compare it against bench mark signals which would have existed in the absence of the radar target in the first place.

Similar technique is used with WiFi signals in the closed area for tracking patients and elderly by Professor Dina Ketabi at MIT.

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