Method and arrangement for determining movement
AssigneeNokia Corporation
InventorsJani Mäntyjärvi, Panu Korpipää
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Abstract
To determine the movement of a device, a three-dimensional measurement of the device's acceleration is provided in known directions with regard to the device, and average signals of acceleration signals parallel to different axes are formed to allow tilt angles of the device with respect to gravity to be defined. Acceleration change signals are formed by removing the average signals from their respective acceleration signals parallel to the different axes. The acceleration change signals and the tilt angles of the device are used for forming a component of the acceleration change of the device, which component is parallel to gravity and independent of the position of the device.
Claims24
A method for determining the movement of a device, in which method the acceleration of the device is measured at least in three different directions to provide a three-dimensional measurement, the method comprising
- generating acceleration signals parallel to three orthogonal axes, which are in a known orientation to the device;
- generating average signals of the acceleration signals parallel to the different axes;
- defining tilt angles of the device in relation to the direction of gravity by means of the average signals;
- generating acceleration change signals by removing the average signals from their respective acceleration signals parallel to the different axes;
- forming a component of the acceleration change of the device by means of the acceleration change signals and the tilt angles of the device, which component is parallel to gravity and independent of the position of the device.
An arrangement for determining the movement of a device, the arrangement being arranged to measure the acceleration of the device at least in three different directions to provide a three-dimensional measurement, the arrangement comprising:
- means for measuring acceleration signals parallel to three orthogonal axes, which are in a known orientation to the device;
- means for generating average signals of the acceleration signals parallel to the different axes;
- means for defining tilt angles of the device in relation to the direction of gravity by means of the average signals;
- means for generating acceleration change signals by removing the average signals from their respective acceleration signals parallel to the different axes;
- and
- means for forming a component of the acceleration change of the device by means of the acceleration change signals and the tilt angles of the device, which component is parallel to gravity and independent of the position of the device.
For determining the movement of a device by measuring acceleration of the device at least in three different directions to provide a three-dimensional measurement, a computer readable medium having computer-executable instructions for performing a method comprising:
- generating acceleration signals parallel to three orthogonal axes, which are in a known orientation to the device;
- generating average signals of the acceleration signals parallel to the different axes;
- defining tilt angles of the device in relation to the direction of gravity by means of the average signals;
- generating acceleration change signals by removing the average signals from their respective acceleration signals parallel to the different axes;
- and
- forming a component of the acceleration change of the device by means of the acceleration change signals and the tilt angles of the device, which component is parallel to gravity and independent of the position of the device.
Dependencies are inferred from the claim text.