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Method and apparatus for generating an indication of loss of positioning integrity in emergency call systems

  • US 6,151,551 A
  • Filed: 03/03/1997
  • Issued: 11/21/2000
  • Est. Priority Date: 03/03/1997
  • Status: Expired due to Term
First Claim
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1. A method for determining a loss of accuracy of a positioning system within an Emergency Call System (ECS) installed in a movable vehicle, said method comprising the steps of:

  • determining an accuracy of a position solution of said positioning system;

    comparing said determined accuracy against a threshold value; and

    generating a warning to indicate that said ECS is not operational when said determined accuracy exceeds said threshold value based upon said step of comparing.

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