In order to solve effectively the problem of dynamic distance-measuring on moving vehicle, this paper discusses the general design scheme based on dynamic distance-measuring system for moving vehicle. This paper uses ultrasonic wave propagation reflex obstacles principle in the air, and ultrasonic probe as interface unit, AT89S8252 single-chip microcomputer as core to calculate the ultrasonic transmission time in the air, and convert it to the corresponding distance to realize dynamic ranging. Through hardware design, it can realize real-time display for the distance between the car and the adjacent car. It can realize sound and light a-larm if the distance is too close. After the software programming and simulation, the results show that hardware and software design of the system is reasonable, anti-jamming ability is powerful, real-time performance is good, and it is of high precision. Through expansion and promotion, the system can be widely used in different ranging occasions with its high ratio of performance and cost.%为了有效解决汽车行驶中的动态测距问题,讨论汽车动态测距系统的总体设计方案,利用超声波在空气中传播遇障碍物反射原理,以超声波探头为接口部件,AT89S8252单片机为核心,计算超声波在空气中传播的时间,并换算成对应的距离来实现动态测距,通过硬件设计实现自车和邻车之间距离的实时显示和非安全距离的声光报警.经软件编程仿真,结果表明该系统软硬件设计合理、抗干扰能力强、实时性良好、精确度较高.经过系统扩展和升级,以其较高的性价比可在不同的测距场合得到广泛应用.
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