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Apparatus and method for determining receiver performance in a multilateration system

  • US 7,928,908 B2
  • Filed: 05/04/2006
  • Issued: 04/19/2011
  • Est. Priority Date: 07/01/2005
  • Status: Expired due to Fees
First Claim
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1. Apparatus for identifying which receiver in a plurality of receivers in known positions in a multilateration system is experiencing a significant group time delay comprising for in a first and subsequent pass:

  • a processor thatdetermines from a first group of receivers a detected position of an aircraft providing a signal source;

    determines from the detected position of the aircraft and the known positions of a receiver or receivers of a second group a predicted difference in time of arrival of the signal from the aircraft for the second group, using a receiver from the first group as a reference;

    compares the predicted difference in time of arrival with an actual difference time of arrival at the second group to derive a difference in time of arrival difference;

    derives a variation in successive difference in time of arrival differences over a segment of a flight path of the aircraft; and

    determines, in the absence of a significant variation in successive differences between predicted and actual time of arrival differences, and in the presence of a difference between predicted and actual time of arrival differences, that a receiver in the second group is experiencing significant time delay.

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