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A comment on Engineers Say They've Created a Way to Detect Bombs and Guns Using Basic Wifi. Parent comment

Re:Engineers Say They've Created a Way to Detect Bombs and G... by fake-name on Thursday August 16, 2018 @03:23PM (#17777723)
> The concept here is to exploit WiFi gear's usages of many different frequencies. Measuring the amplitude and phase shift on each channel provides some info about what each channel bounced off of and diffracted around.

This exists. They're just reimplemented non-cooperative SFCW radar. It's not new.

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