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Method and apparatus for calculating altitude based on barometric and GPS measurements

  • US 6,735,542 B1
  • Filed: 06/25/2001
  • Issued: 05/11/2004
  • Est. Priority Date: 05/09/2001
  • Status: Active Grant
First Claim
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1. A navigation device comprising:

  • a barometric altimeter for obtaining barometric elevation readings based on barometric pressure measurements;

    a processor for providing GPS elevation readings based on GPS measurements, said processor calculating differences between said barometric elevation readings and said GPS elevation readings;

    a filter filtering said differences to produce a barometer correction quantity, said filter being adjustable between a short time constant and a long time constant based on a time lapsed since a predetermined event; and

    said processor correcting said barometric elevation readings based on said barometer correction quantity.

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