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Detection of signals

  • US 9,116,186 B2
  • Filed: 02/10/2011
  • Issued: 08/25/2015
  • Est. Priority Date: 02/10/2010
  • Status: Active Grant
First Claim
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1. A method of determining an operation of equipment in an area based on radiated emissions of the equipment, the method comprising:

  • a) receiving radiated emissions in at least one frequency band;

    b) generating at least one spectral output signal indicative of the received radiated emissions, the at least one spectral signal having peaks;

    c) processing each spectral output signal to determine modulation on the peaks over time in the spectral output signal;

    d) comparing the modulation on the peaks with data stored in a database; and

    e) determining a presence of operating equipment in the area from the comparing.

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