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Method of an apparatus for detecting the displacement of a target

  • US 5,734,346 A
  • Filed: 11/22/1994
  • Issued: 03/31/1998
  • Est. Priority Date: 05/23/1992
  • Status: Expired due to Fees
First Claim
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1. A method of detecting the displacement of a target in a given environment, comprising:

  • storing reference data comprising data representative of the environment;

    transmitting a transmit signal towards the target;

    sensing the return signals from the target and the environment; and

    detecting the displacement of the target by comparing the return signals and the reference data;

    the reference data being updated at an update rate which is varied in dependence on the displacement of the target.

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