基于动态时间间隔的超声波定位系统设计

针对传统的被动式超声波定位方法,无法对快速移动物体进行精确定位的问题,提出一种改进被动式定位方法。通过射频信号实现发送端与接收端的时间同步,根据移动目标的上一次位置信息,动态调整超声波发射端的发射间隔,使其既能保持多个物体同时定位的优点,又能保证系统的实时性。基于STC 12LE5612AD单片机搭建了自动导引运输车(automated guided vehicle,AGV)室内定位系统,对改进前后的超声波定位方法进行验证对比,结果表明,改进后的方法弥补了传统定位方法的不足,可以显著提高快速移动物体的定位精度。

Design of ultrasonic positioning system based on dynamic time interval

Because passive traditional ultrasonic location method can not locate the object with faster moving speed, an improved passive location method was presented. The time synchronization between sending terminal and receiving terminal is realized by RF signal, and the transmitting interval of ultrasonic transmitting terminal is adjusted dynamically according to the last location value of mobile target, so that it can not only keep many objects at the same time, but also ensure the real-time performance of the system. Based on the STC 12LE5612AD microcontroller, the AGV indoor positioning system is designed, the ultrasonic positioning method before and after the improvement is verified and compared, the results show that the improved method makes up for the shortage of traditional location method and significantly improves the positioning accuracy of fast moving objects.