See Through Walls By Visualizing the Scatter of Your Wi-Fi

Researchers Tan and UCL colleagues presented a paper outlining an approach to "seeing" through walls as thick as 25 centimeter thick masonry walls thanks to a means of calculating Doppler shifts of Wi-Fi and mobile telephone signals in the interior space. From IEEE Spectrum:

...By tweaking the processing parameters—increasing signal-integration time and lowering sensitivity thresholds—the engineers could coax the passive radar into “seeing” quite subtle movements, even hand gestures. At this stage, the device doesn’t produce anything resembling a photograph of the subject. It delivers a radar-style scatter plot, a flare of color that says, “Here he is!” along with a variety of signal data.  The system is described in more detail in a paper that Tan and UCL colleagues Qingchao Chen, Karl Woodbridge, and Kevin Chetty presented at the 2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), held 19-24 April in South Brisbane, Australia....

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Matt Griffin
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