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US 8,912,899 B2Granted
Wireless sensor network calibration system and method
AssigneeIntegrity Tracking, LLC
InventorChris A. Otto
Life of this patent
Estimating the term…
Abstract
A system has at least one sensor and a controller communicatively coupled to the sensor. The system further has logic configured to calculate a calibration value based upon an initial state of the sensor and store the calibration value in memory.
Claims19
A system, comprising:
- at least one sensor for measuring acceleration coupled to a body of a user, the sensor having an axis system that is offset from an axis system of the user based upon placement of the sensor on the body of the user;
- a controller communicatively coupled to the sensor via a network;
- and
- logic configured to receive a first acceleration measurement in an x-direction of the sensor's axis system and a second acceleration measurement in a z-direction of the sensor's axis system when the user is standing in a vertical position, the logic further configured to calculate a first angle value indicative of a first angular offset value between the user's axis system and the sensor's axis system and a second angle value indicative of a second angular offset value between the user's axis system and the sensor's axis system based upon the first measurement and the second measurement and an assumption that static effects of gravity only affect a z-axis of the sensor in a magnitude of 1 g, the logic further configured to store the first and second angle values in memory.
1 more element
A method, comprising the steps of:
- coupling a sensor for measuring acceleration to a user's body, the sensor having an axis system that is offset from an axis system of the user based upon placement of the sensor on the on the body of the user;
- communicatively coupling a controller to the sensor;
- receiving a first acceleration measurement from the sensor in an x direction of the sensor's axis system when the user is standing in a vertical position;
- receiving a second acceleration measurement from the sensor in a z-direction of the sensor's axis system when the user is standing in the vertical position;
- calculating a first angle value indicative of a first angular offset value between the user's axis system and the sensor's axis system and a second angle value indicative of a second angular offset value between the user's axis system and the sensor's axis system based upon the first acceleration measurement and the second acceleration measurement and an assumption that static effects of gravity only affect a z-axis of the sensor in a magnitude of 1 g;
- and
- storing the first and second angle values in memory.
4 more elements
A system, comprising:
- at least one sensor for measuring acceleration coupled to a body of a user, the sensor having an axis system that is offset from an axis system of the user based upon placement of the sensor on the body of the user;
- a controller communicatively coupled to the sensor;
- and
- means for receiving a first acceleration measurement in an x-direction of the sensor's axis system and a second acceleration measurement in a z-direction of the sensor's axis system when the user is standing in a vertical position;
- and
- means for calculating a first angle value indicative of a first angular offset value between the user's axis system and the sensor's axis system and a second angle value indicative of a second angular offset value between the user's axis system and the sensor's axis system based upon the first acceleration measurement, the second acceleration measurement, and an assumption that the static effects of gravity only affect a z-axis of the sensor in a magnitude of 1 g.
3 more elements
Dependencies are inferred from the claim text.