首先对现存的GPS/INS组合系统中不同的时间解决方案进行了分析。然后从模块化角度出发,利用NI公司的数据采集板卡和软件Labview,通过软硬件结合的方法搭建了一种方便灵活、低成本的时间同步模块。通过实验证实,应用于市面上常见的RS-232数据接口的低精度的微机械INS传感器也可以达到5 ms的同步精度。
Firstly,the limitations and advantages of various existing time synchronization solutions of GPS/INS are investigated in this paper.From the angle of modularity,a flexible low-cost time synchronization solution using a DAQ card and Labview software of NI in the way of both hardware and software is proposed and implemented.The test shows that a synchronization accuracy of 5 ms was achieved when the test system was applied to synchronize a low-grade micro-electromechanical inertial measurement unit(IMU),which only has an RS-232 data output interface.