一种高精度数据同步测量方法研究

A synchronous survey method of highly precise data

在光学摄像测量中,各种数据的同步采集在事后处理中尤为重要。目前GPS授时同步技术已经很成熟,它具有精度高,操作灵活等优点,可以很好地应用于光学摄像测量中。本文深入研究了GPS OEM板授时原理,在分析了GPS OEM板芯片中RS232时间输出与1pps输出特点的基础上,基于VC开发环境下实现了GPS OEM板与计算机串口的通信,为摄像测量设置一精确的时间起点,再利用CPU时间戳进行高精度计时,这样整个测量系统就有一高精度的时钟,任一数据的产生都被标记上精确的绝对时刻,利用这些时刻信息就间接地实现了摄像测量数据的高精度同步。实验数据表明,该方法的同步精度可以达到毫秒级,可以满足光学摄像测量的同步精度要求。

In the survey of the optical videograph, the acquisition of synchronous data is very important in the disposal of data after the event. Currently the technology of GPS is becoming mature which is precise and can be operated neatly. So this article actualized the communication between the computer and the GPS OEM based on VC ＋＋ , after that it set a precise jumping-off point of time to the software of camera control, then there was a highly precise clock in process of photograph with the precise time of CPU, so every data was saved with the precise time. According to the result of experimentation, the precision could reach millisecond level, and could satisfy the synchronization requirement of optics videographic survey.