基于加速度矢量特征的老人跌倒检测装置设计

Design of Fall Detection Device for Elderly Based on Acceleration Vector Feature

针对老人意外跌倒的及时救助问题,设计了一种基于加速度矢量特征的老人跌倒检测装置;该装置结合加速度传感器MMA8452Q、GSM通信和GPS定位技术,通过分析人体姿态变化时的加速度矢量特征,利用加速度Z轴分量和加速度幅值作为跌倒判定的基础准则,并且考虑到跌倒后是否严重未起来,以加速度幅值的瞬时变化值为辅助提高了对于跌倒检测求助事件的判定准确性,据此远程报警并发送老人位置信息以及时施救;实测结果表明,该装置能准确地辨别出老人日常行为和意外跌倒需要求助状态并进行报警,降低跌倒带来的风险,实用性强。

Focused on the issue that elderly can be rescued timely after falling down, a fall detection device for the elderly based on acceleration vector feature is designed. The device combined with the accelerometer sensor MMA8452Q. GSM communication and GPS positio ning technology, by analyzing the characteristics of acceleration vector when the body posture changed, used the Z axis component of the ac eeleration and acceleration amplitude as the basic standards to determine fall accident. Furthermore, considering whether it is serious or not after the fall, we also use the instantaneous change of acceleration amplitude as the assistant criterion to improve the accuracy of judgment of fall detection. According to above criterion, the device can alarmed and sent the elderly location information for rescuing in time. The experi- ment results show that the device can accurately distinguish between the elderly＇s daily behavior and the state of falling down in which need helping. When the accidentally falls happen , it can send an alarm in the first time , reduce the risk of fall and has strong practicability.