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  • US 6,870,792 B2
  • Filed: 08/02/2001
  • Issued: 03/22/2005
  • Est. Priority Date: 04/04/2000
  • Status: Active Grant
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First Claim
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1. A method comprising:

  • transmitting a signal;

    receiving a first echo in response to the signal; and

    receiving a second echo in response to the signal;

    wherein if an amplitude of the first echo exceeds a corresponding amplitude of the second echo, then the second echo is determined to be a multipath error from a single object; and

    wherein if an amplitude of the second echo exceeds a corresponding amplitude of the first echo, then the first and second echoes are determined to be from first and second objects, respectively, and the method further comprises;

    using the first echo to determine information relating to the first object; and

    using the second echo to determine information relating to the second object.

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