中文摘要：

提出一种基于多普勒效应的自动拨号防盗报警系统的设计方法,由单片机AT89S51控制,当有人进入监控区时,报警系统能自动拨打设定的电话或手机.实验表明,报警系统监控范围为4米,监控角度为120°,系统结构简单,性能稳定,性价比高.

英文摘要：

A design method of automatic dialing alarm system is put forward based on Doppler Effect. The system is controlled by MCU AT89S51. It will dial automatically initialized telephone or mobile when someone coming into the monitoring range. The test result shows that its monitoring range is 4m, its monitoring angle is 120°, its structure is simple, its performance is stable, and its performance price ratio is high.