Sensing Compensation for an Activity Monitor

Abstract

One of the most popular types of personal health device is the activity monitor, which is attached to the user’s wrist or waist in order to measure physical activity data such as exercise time/duration and calorie consumption. Given that it has an activity sensor and a gyro sensor to measure the speed of a user’s movement, an activity monitor can also be used to track the movement of sporting equipment. The accelerator sensor in the activity monitor used for this study can measure up to a certain level. When the activity monitor is attached to a body part or slow-moving sporting equipment, the limit of the certain level is considered to be enough to measure the activity data. However, the peak acceleration of fast-moving sporting equipment may exceed the certain level. In this paper, in order to overcome the limitations of the sensor, the peak acceleration of the fast-moving sporting equipment is estimated using the interpolation method based on the acceleration values of the rest of the movement. Furthermore, it also describes how to calculate a swing surface.