CALCULATING AN ESTIMATE OF WIND RESISTANCE EXPERIENCED BY A CYCLIST
First Claim
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1. A method comprising:
- collecting a plurality of time-stamped measurements of position, speed, heading, and altitude of a wearer engaged in an activity;
splitting the plurality of time-stamped measurements of position, speed, and heading into a plurality of straight-line segments;
determining a plurality of time-stamped grade estimates based on one or more of the plurality of time-stamped position, speed, heading, and altitude measurements;
determining a plurality of time-stamped total power outputs of the wearer engaged in the activity;
determining a wind speed;
determining a wind direction; and
estimating one or more of power output due to wind resistance, relative air velocity, coefficient of rolling resistance, coefficient of drag, and exposed surface area based on at least one of the plurality of time-stamped total power outputs, the plurality of time-stamped measurements, the determined wind speed, and the determined wind direction.
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Abstract
Improved techniques and systems are disclosed for determining the components of resistance experienced by a wearer of a wearable device engaged in an activity such as bicycling or running. By monitoring data using the wearable device, improved estimates can be derived for various factors contributing to the resistance experienced by the user in the course of the activity. Using these improved estimates, data sampling rates may be reduced for some or all of the monitored data.
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Citations
20 Claims
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1. A method comprising:
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collecting a plurality of time-stamped measurements of position, speed, heading, and altitude of a wearer engaged in an activity; splitting the plurality of time-stamped measurements of position, speed, and heading into a plurality of straight-line segments; determining a plurality of time-stamped grade estimates based on one or more of the plurality of time-stamped position, speed, heading, and altitude measurements; determining a plurality of time-stamped total power outputs of the wearer engaged in the activity; determining a wind speed; determining a wind direction; and estimating one or more of power output due to wind resistance, relative air velocity, coefficient of rolling resistance, coefficient of drag, and exposed surface area based on at least one of the plurality of time-stamped total power outputs, the plurality of time-stamped measurements, the determined wind speed, and the determined wind direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A wearable device comprising:
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a positional sensor for obtaining position, speed, heading, and altitude information of a wearer of the wearable device; a power output sensor for obtaining data correlated to the total power output of the wearer of the wearable device; and a processor communicatively coupled to the positional sensor and the power sensor, wherein the processor is configured to; receive a plurality of time-stamped measurements of position, speed, heading, and altitude information from the positional sensor; receive power output data from the power output sensor; split the position, speed, and heading information into a plurality of straight-line segments; determine a plurality of time-stamped grade estimates based on one or more of the plurality of time-stamped measurements of position, speed, heading, and altitude; determine a plurality of time-stamped power output measurements from the power output data; determine a wind speed; determine a wind direction; and estimate one or more of power output due to wind resistance, relative air velocity, coefficient of rolling resistance, coefficient of drag, and exposed surface area based on at least one of the plurality of time-stamped total power outputs, the plurality of time-stamped measurements, the determined wind speed, and the determined wind direction. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification