Abstract
We demonstrate passive RADAR interrogation of passive sensors: the non-cooperative signal source is analyzed to detect time-delayed copies of the reference signal generated by the cooperative target. The acoustic sensor is designed to introduce a delay dependent on a physical quantity under investigation, so that analyzing the echoes generated by the cooperative target allows for recovering the measured quantity. We demonstrate the passive RADAR principle for probing SAW cooperative targets acting as sensors using a WiFi emitter. Furthermore in the context of aeronautical deployment, we demonstrate the interrogation of a sensor operating in the 4.2–4.4 GHz WAIC (Wireless Avionics Intra-Communication) frequency band using a noise RADAR following principles similar to those implemented in a passive RADAR approach.
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