一种基于GPS/电子罗盘的低成本POS系统的实现

Development of a Low-cost POS System Based on GPS/Electronic Compass

文章利用GPS接收机,三维电子罗盘研制了一个工程实现简易、成本低廉的实时定位测姿系统。针对不同传感器间存在的时间同步问题,系统以GPS提供的UTC时间为基准,通过STM32单片机的16位定时器获得各传感器的同步时间差,将各传感器独立的时间系统统一到UTC时间上,再经过内插处理,完成时间同步数据的获取。实验结果表明该系统具有较高的稳定性和可靠性,静态定位误差约为25m,综合考虑实验的内外部因素,认为该系统的定位精度在合理的范围之内,满足一般的民用低精度应用要求。

This paper presents a position and orientation system （POS） which is simple and low--cost, aiming to collect and store the position and attitude information of the target sensor. In the synchronization solution, the timing is accomplished by using a STM32 16--bit internal timer obtaining the lag among each sensor. By unifying the time of each subsystem to UTC time and interpolating the data to ensure the measurements coincidence at each epoch, the synchronisation problem can be solved. The experiment showed that the proposed POS collects high quality and high--reliability of the position data with an accuracy of 25m and meets the need for the civilian users.