一种精确计步系统的设计与实现

Design and implementation of system for precise step counting

目前市面上大多是智能手机或可穿戴设备来计算步数,由于人体运动姿态的不确定性以及外界因素的干扰,计步时存在适应性差、混合运动状态下误差较大等问题。因此,基于加速度和压力传感器设计了一款精确计步系统,提出了加速度和压力特征变化结合运动时间阈值的计步算法。该系统可以区分行走和跑步的运动状态,完成对运动步伐的精确计数,从而实现对人体能量消耗的准确计算。实验结果表明,在单一运动状态下的计步误差率低于2%,在不同运动状态下的混合计步准确率可达到97%以上。该计步系统精确度高,成本低廉,可以广泛应用于运动健身、养生保健等。

At present, most of the steps are calculated by smart phones or wearable devices on the market. Due to the uncertainty of human motion and the interference of external factors, there are some problems in the calculation of steps, such as poor adaptability and large error in mixed motion. Therefore, it designs an precisely step counting system based on acceleration and pressure sensors, and proposes a step measurement algorithm which combines the change of acceleration and pressure characteristics with the threshold of motion time. This system can distinguish the movement state of walking and running, and complete the accurate count of the movement steps, so as to realize the accurate calculation of the human energy consumption. The experimental results show that the step error rate is less than 2% in a single motion state, and the accuracy rate of mixed step can reach over 97% in different motion states. The system has high accuracy and low cost, and can be widely used in sports and health care.