水下GPS系统的时间同步标定研究与试验

Research on time synchronization calibrating in underwater GPS system and its experiment

本文从水下GPS系统的定位原理出发,阐述了时间同步的重要性。利用GPSRTK共视法,通过GPS接收机的1PPS时间同步和触发式时间同步的标定试验,证明了GPS接收机时间同步的精度可以达到几十个ns,可以作为水下定位的时间基准;同时对GPS浮标设计了全新的安置方式,实现了GPS浮标的时间同步标定,完成了GPS浮标的时间同步稳定性的试验,实现了GPS浮标相对钟差的高精度。

In this paper, from the positioning principle of underwater DGPS system, the importance of time synchronization is discussed. With GPS RTK all-watch method, it is proved that the precision of time synchronization can reach a few tens of nanosecond via 1PPS time synchronization calibrating experiment and trigger time synchronization calibrating experiment, and so the GPS time can be used as the reference time in underwater positioning. At the same time, the new configuration of GPS buoys is designed, the time synchronization of GPS buoys is calibrated, the time synchronization stability experiment of GPS buoys is finished. At last, the high quality and high precision time synchronization of relative clock error in GPS buoys are realized.