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结合现有时间同步方法及高精度POS的应用需求,提出了一种以GPS接收机输出的1PPS秒脉冲为基准,采用数字参数反馈方式,对惯性测量单元的数据采集脉冲周期进行实时修正的高精度POS时间同步方法,并给出了一种简易的POS时间同步精度测试方法。然后结合光纤陀螺POS实际系统进行了时间同步精度测试和对比实验。结果表明,所提出的时间同步方法能够克服时钟漂移并修正时间信号传输延迟,在保证工作可靠性的同时实现了在融合点上数据的高精度同步。
Combining with the existing time synchronization method and the application requirements of high-precision POS, a new method based on 1PPS second pulse output by GPS receiver is proposed, which uses digital parameter feedback method to correct the data acquisition pulse period of inertial measurement unit in real time Accuracy POS time synchronization method, and gives a simple POS time synchronization accuracy test method. Combined with the actual system of fiber optic gyroscope, time synchronization accuracy test and comparison experiment were carried out. The results show that the proposed time synchronization method can overcome the clock drift and correct the time delay of signal transmission, and achieve the high precision synchronization of the data at the fusion point while ensuring the reliability of the operation.