SENSOR ORIENTATION MEASUREMENT WITH RESPECT TO PEDESTRIAN MOTION DIRECTION
First Claim
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1. A mobile device comprising:
- an accelerometer configured to generate acceleration information relating to motion of the device and to identify information relating to an orientation of the device;
a step detector configured to identify pedestrian steps of a user of the device and corresponding pedestrian step duration information;
a motion direction tracking module communicatively coupled to the accelerometer and the step detector and configured to separate a forward motion direction of the device with respect to the user of the device indicated by the acceleration information from vertical and transverse motion directions of the device based on the pedestrian steps identified by the step detector; and
a misalignment angle computation module communicatively coupled to the accelerometer and the motion direction tracking module and configured to determine a misalignment angle between the forward motion direction of the device and the orientation of the device with respect to the user of the device.
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Abstract
Systems and methods are described for measuring orientation of sensors associated with a mobile device with respect to pedestrian motion of a user of the mobile device. An example technique described herein includes obtaining acceleration information associated with the mobile device, partitioning the acceleration information according to respective detected pedestrian steps of the user, identifying a forward motion direction of the user of the mobile device based on the acceleration information and the detected pedestrian steps, and computing a misalignment angle between the forward motion direction of the user of the mobile device and an orientation of the mobile device.
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Citations
28 Claims
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1. A mobile device comprising:
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an accelerometer configured to generate acceleration information relating to motion of the device and to identify information relating to an orientation of the device; a step detector configured to identify pedestrian steps of a user of the device and corresponding pedestrian step duration information; a motion direction tracking module communicatively coupled to the accelerometer and the step detector and configured to separate a forward motion direction of the device with respect to the user of the device indicated by the acceleration information from vertical and transverse motion directions of the device based on the pedestrian steps identified by the step detector; and a misalignment angle computation module communicatively coupled to the accelerometer and the motion direction tracking module and configured to determine a misalignment angle between the forward motion direction of the device and the orientation of the device with respect to the user of the device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of identifying a misalignment angle associated with motion of a mobile device, the method comprising:
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obtaining acceleration information associated with the mobile device; partitioning the acceleration information according to respective detected pedestrian steps of a user; identifying a forward motion direction of the user of the mobile device based on the acceleration information and the detected pedestrian steps; and computing a misalignment angle between the forward motion direction of the user of the mobile device and an orientation of the mobile device. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A mobile device comprising:
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an accelerometer configured to generate acceleration information relating to motion of the device and to identify information relating to an orientation of the device; a step detector configured to identify pedestrian steps of a user of the device and corresponding pedestrian step duration information; direction means, communicatively coupled to the accelerometer and the step detector, for inferring a forward motion direction of the device from the acceleration information based on the pedestrian steps identified by the step detector; and misalignment means, communicatively coupled to the accelerometer and the direction means, for determining a misalignment angle between the forward motion direction of the user of the device and the orientation of the device with respect to the user of the device. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. A computer program product residing on a non-transitory processor-readable medium and comprising processor-readable instructions configured to cause a processor to:
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obtain acceleration information associated with a mobile device; divide the acceleration information according to respective detected pedestrian steps of a user of the mobile device; identify a forward motion direction of the user of the mobile device based on the acceleration information and the detected pedestrian steps; and compute a misalignment angle between the forward motion direction of the mobile device and an orientation of the mobile device with respect to the user of the mobile device. - View Dependent Claims (25, 26, 27, 28)
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Specification