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Emitter proximity identification

  • US 7,944,389 B1
  • Filed: 07/09/2009
  • Issued: 05/17/2011
  • Est. Priority Date: 07/09/2009
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • storing an electronic signature map (ESM) of a selected geographic area, the electronic signature map comprising previously calculated emitter closeness measures (ECMs) in the selected geographic area, wherein the ECMs are representative of detected sources of radio frequency energy;

    detecting a radio frequency energy emission;

    creating a new ECM for the radio frequency energy emission based on relative measures of the radio frequency emission;

    comparing the new ECM with the ECMs in the electronic signature map;

    determining whether the new ECM should be considered a threat; and

    geo-locating a position of an emitter represented by the new ECM.

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