智能手机碰撞检测及在汽车事故自救中的应用

针对现有汽车事故自救需要装配特定传感零件的缺点，提出一种基于智能手机的自动报警方法。该方法以反映手机用户物理运动的加速度传感信号为样本输入，引入时间窗口计算阈值，当信号超过阈值后，自动借助手机的拍照和3G联网功能实时向救援中心报警。在Symbian平台上实现原型系统。实验结果表明，该方法具有较好的碰撞识别效果，在手持设备上能耗较小，能够利用现有设备，在不增加汽车制造成本的前提下增强其安全性。

Shock Detection with Smart Mobile Phone and Its Application in Car Accident Self-rescue

To address the shortcoming of relying on the car＇ own hardware in existing car accident self-rescue,this paper proposes an automatic alarm method based on smart mobile phone.The method takes the acceleration sensing signal as sample input which reflects physical movement of mobile phone users,introduces frequency and time parameters to improve the existing methods of calculation of the threshold.It implements the prototype system on Symbian platform,which alarms to the rescue center automatically and real time,by taking advantage of mobile-phone camera and 3G mobile phone networks.Experimental results show that the method has better impact detection and energy saving effect.