Method and apparatus for determining the altitude of a mobile device

An altitude, mobile device technology, applied to equipment with stored calibration coefficients, measuring devices, altitude/level measurements, etc., to the effect of improving effectiveness

Active Publication Date: 2009-03-04
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of an altimeter has not been implemented in low cost consumer mobile devic

Method used

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  • Method and apparatus for determining the altitude of a mobile device
  • Method and apparatus for determining the altitude of a mobile device
  • Method and apparatus for determining the altitude of a mobile device

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Experimental program
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Embodiment Construction

[0016] As used herein, "mobile device" refers to a device such as a cellular telephone, other wireless communication device, laptop computer, or other mobile positioning device.

[0017] At any given location, atmospheric pressure typically varies by up to 2% depending on weather conditions (low versus high pressure systems). Local atmospheric pressure also varies exponentially with altitude. close to the earth's surface, elevation h 0 About 9km. For a height h above the reference position, the pressure is given by;

[0018] p = p 0 × e - h / h 0

[0019] where p 0 is the atmospheric pressure at the reference location. Assuming that atmospheric pressure is constant, pressure sensors can be used to accurately determine changes in altitude. This cannot be directly applied...

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Abstract

A method and apparatus for combining pressure information from pressure sensors, motion information from dead reckoning or other motion sensors, such as accelerometers, gyroscopes, and geomagnetic sensors, and temperature information from temperature sensors, to separate a change in altitude from a change in environmental pressure or temperature. A change in measured pressure without any motion or change in temperature must be a weather-related barometric pressure change. If there is an associated temperature change, but no motion, and the rate of change is too fast for a normal weather change, the measured change represents a change in sensitivity of the pressure sensor with temperature, and the sensor calibration can be adjusted. A rapid change in pressure, associated with horizontal motion, but no measurable vertical motion represents a movement into a different pressure environment. Only changes in pressure that are associated with measurable vertical motion are true changes in altitude.

Description

[0001] Claim of priority under 35 U.S.C § 119 [0002] This patent application claims priority to Provisional Application Serial No. 80 / 784,609, filed March 20, 2006, entitled "Improved Altitude Determination in Mobile Devices," which has been assigned to its assignee is hereby expressly incorporated herein by reference. technical field [0003] The present invention relates to mobile devices and more particularly to a method and apparatus for accurately determining the altitude of a mobile device. Background technique [0004] Position determination is an important and growing feature of cellular telephones and other handheld mobile devices. The most common method of determining location is to embed Global Positioning System (GPS) navigation receiver capabilities into mobile devices. However, GPS-based positioning has limitations. GPS systems do not accurately resolve altitude, and in some larger and more complex installations, GPS systems have been augmented with a bar...

Claims

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Application Information

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IPC IPC(8): G01C5/06G01L19/02G16Z99/00
CPCG01C5/06G16Z99/00G06F17/40G01L19/02G01B21/02G01C25/00G01D18/008
Inventor 托马斯·G·沃尔夫
Owner QUALCOMM INC
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