Abstract: Though the study of automatic alarm method on body slipping up，propose a kind of technology to detect the signal of falls and send alarm GSM Short Messages （SMS）.The detection system is mainly composed of a low power MCU MSP430F449，an acceleration sensor MMA7260Q and the GSM module.By using the AT instruction program，the MCU can control the GSM module to send SMS.The system can detect the body slipping up signal about gradient or vertical or impact signal.It also can eliminate the error alarm signal in the appointed time，so the system alarm is veracious.Via the experiment of the stance simulation about error alarm，no miss alarm and no false alarm happen，which proves that the technology is feasible and has its practical value.

Key words: acceleration sensor, body slipping up, GSM short messages, AT command

摘要： 通过对人体跌倒自动报警机制的研究，提出一种基于MEMS加速度传感器的侦测人体跌倒信号、自动通过手机短信报警，以及修正误报警的方法，并由低功耗MSP430F449单片机和MMA7260Q加速度传感器，以及GSM模块，通过AT指令程序，实现了单片机控制GSM模块自动发送跌倒求救短信息。它可以检测人体在倾斜、垂直方向的跌倒信号和跌倒时发出的撞击信号，能自动发送短信，还可以在指定时间内消除错误报警信号，具有报警准确性高的突出优点。通过姿态模拟漏报警和误报警实验，结果表明没有出现漏报警和误报警，证明该方法可行，具有应用价值。

关键词: 加速度传感器, 跌倒, GSM短信息, AT指令