Device and method for calibrating and improving the accuracy of barometric altimeters with GPS-derived altitudes
First Claim
1. An electronic device comprising:
- an altimeter comprising a barometric pressure sensor;
a GPS unit; and
a housing for housing said altimeter and said GPS unit, wherein said device is operable to calibrate said altimeter while said device is in motion.
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Accused Products
Abstract
A portable, handheld electronic navigation device includes an altimeter and a GPS unit. An internal memory stores cartographic data, for displaying the cartographic data on a display of the navigation device. Accordingly, the device is capable of displaying cartographic data surrounding a location of the unit as determined by GPS and altitude information as determined by the barometric altimeter and GPS. The device provides an enhancement of the calibration and hence the accuracy of barometric altimeter measurements with the aid of derived altitudes from a GPS. The device is able to determine the need for calibration and perform the subsequent computations necessary to facilitate the calibration. Furthermore, the device is able to determine a correction quantity that should be applied to barometric altitude readings, thereby allowing the device to be calibrated while in motion. Both of these features ultimately result in a more accurate determination of altitude. In accordance with an aspect of the invention, the altimeter of the navigation device may be calibrated with altitude information entered by a user, with altitude information obtained from the cartographic, with altitude information derived from GPS or with any combinations thereof.
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Citations
6 Claims
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1. An electronic device comprising:
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an altimeter comprising a barometric pressure sensor;
a GPS unit; and
a housing for housing said altimeter and said GPS unit, wherein said device is operable to calibrate said altimeter while said device is in motion. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification