Vehicle active safety systems have been proved effective for saving lives and reducing traffic accident. However, these systems were more expensive and less widespread than smart-phones,the multi-sensor functions and information processing ability inside the cell phone were greatly improved for further application. Firstly, the parameters and functions for these sensors are introduced in this study. Then, the framework of smart-phone based active safety system is proposed. The function for safety warning system is designed using forward collision warning, lane departure warning system as examples, and is well explained. The field experiment using two typically smart-phone system and professional system was conduct for function and accuracy analysis finally. The results indicate that the accuracy of smartphone based system was acceptable; the high-equipped smart-phones can realize even more active safety warning function.%介绍了智能手机中传感器类型,提出了基于智能手机的预警系统体系框架,设计了安全预警功能.采用道路实验横向测评了两款智能手机安全预警软件和一款专业设备在功能、可靠性等方面的指标,前碰撞和车道偏离预警结果表明:智能手机可以实现专业系统的主动安全预警功能并进一步拓展,预警信息发布精度也在可接受范围内.
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