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Emitter identification from radio signals using keyclick algorithm

  • US 6,215,440 B1
  • Filed: 12/07/1990
  • Issued: 04/10/2001
  • Est. Priority Date: 12/07/1990
  • Status: Expired due to Term
First Claim
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1. A system for emitter identification of a transmitting platform using microphone keyclick analysis, comprising:

  • means to detect transmission activity on a radio channel in the audio frequency range;

    means to detect the boundaries of transmitter keyclicks at the beginning and end of said transmission;

    means to extract keying envelopes from said detected keyclick boundaries;

    means to analyze said keying envelopes to extract features characteristic of said keyclicks;

    means to execute a decision function based on said extracted characteristic features to identify the platform of said transmitter based on the features of said keyclick.

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