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Methods for processing measurements from accelerometer

An accelerometer, measurement results technology, applied in measurement devices, inclination measurement, diagnostic recording/measurement, etc., can solve problems such as bulky and cumbersome

Inactive Publication Date: 2011-08-17
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in addition to the disadvantages associated with the use of the gyroscopes described above, the need for three different types of sensors in order to measure the six degrees of freedom of the movement of a person results in a very bulky and heavy device

Method used

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  • Methods for processing measurements from accelerometer
  • Methods for processing measurements from accelerometer
  • Methods for processing measurements from accelerometer

Examples

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Embodiment Construction

[0034] figure 1 is a graphical representation of the measurement results of the acceleration A measured by the accelerometer. The accelerometer measures the acceleration A acting on the accelerometer in three dimensions and provides an indication of the acceleration A along three orthogonal axes (labeled x a 、y a and z a )signal of.

[0035] When an accelerometer is attached to a person or other object capable of moving relative to a fixed frame of reference, the orientation of the accelerometer may change relative to the fixed frame of reference.

[0036] In this illustration, acceleration A has components A measured along three axes separately x 、A y and A z .

[0037] For accelerometers subjected to little or no acceleration (other than gravity), the acceleration A experienced by the accelerometer will substantially correspond to the acceleration of gravity. Therefore, from this assumption, it is possible to relate the acceleration A to the force of gravity, where t...

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Abstract

There is provided a method for estimating the orientation of an accelerometer relative to a fixed reference frame, the method comprising obtaining signals from the accelerometer, the signals indicating the components of the acceleration acting on the accelerometer along three orthogonal axes; identifying the axis with the highest component of acceleration; and determining the orientation of the accelerometer by determining the angle between the acceleration acting on the accelerometer and the axis with the highest component of acceleration. There is further provided a method for estimating the vertical acceleration in the fixed reference frame using the estimated orientation.

Description

technical field [0001] The present invention relates to an accelerometer for measuring acceleration in three dimensions, and in particular to a method for processing measurements from the accelerometer. Background technique [0002] In general, an object has six degrees of freedom in three-dimensional space, translation along three perpendicular axes and rotation about three perpendicular axes. Since the object's motion along each of the three translation axes is independent of the other two translation axes, and independent of rotation about any of the rotation axes, the motion has six degrees of freedom. [0003] This is well known in the field of inertial sensors where several sensors are traditionally required in order to measure and calculate all six degrees of freedom of the monitored object. Typically, the six degrees of freedom of an object are monitored using accelerometers, which measure acceleration along three axes of translation, gyroscopes, which measure rotat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C9/00
CPCG01C9/00A61B5/1116
Inventor S·施伦博姆
Owner KONINK PHILIPS ELECTRONICS NV
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