Heading constraints in a particle filter
First Claim
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1. A computer implemented method for determining a heading estimate of a portable device worn or carried by a user, comprising:
- collecting data from a plurality of sensors associated with the portable device;
determining with a processor a confidence level associated with data collected from each of the plurality of sensors;
determining with the processor if the portable device is indoors or outdoors based on the collected sensor data and the confidence level, wherein collected sensor data with a low confidence level is not used to determine if the portable device is indoors or outdoors; and
determining the heading estimate using a particle filter based on the indoor or outdoor determination and the collected sensor data.
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Abstract
A method for computing a correction to a compass heading for a portable device worn or carried by a user is described. The method involves determining a heading for the device based on a compass reading, collecting data from one or more sensors, determining if the device is indoors or outdoors based on the collected data, and correcting the heading based on the determination of whether the device is indoors or outdoors.
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17 Claims
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1. A computer implemented method for determining a heading estimate of a portable device worn or carried by a user, comprising:
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collecting data from a plurality of sensors associated with the portable device; determining with a processor a confidence level associated with data collected from each of the plurality of sensors; determining with the processor if the portable device is indoors or outdoors based on the collected sensor data and the confidence level, wherein collected sensor data with a low confidence level is not used to determine if the portable device is indoors or outdoors; and determining the heading estimate using a particle filter based on the indoor or outdoor determination and the collected sensor data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification