摘要
本文设计了基于MotorolaVPOncore接收机的新型GPS共视时间传递系统 ,用高分辨时间间隔计数器测量本地原子钟和GPS接收机输出秒信号的时差 ,通过读取导航电文得到GPST和指定卫星的时差 ,于是得到本地原子钟与指定星钟的时差 ,实现GPS共视法单站测量。为确保系统严格共视 ,使用多线程和同步监测机制设计了可靠的同步控制策略 ,两套系统的超短基线单通道共视比对结果表明 ,系统性能稳定 ,比对精度 (用原始共视数据的均方根表示 )不大于 4 .9ns.该系统可应用于SDH通信网时间同步、交换机时间同步等高精度定时领域 .
A new design of GPS common-view time transfer system is presented. The time difference between the 1pps of local clock and that of Motorola VP Oncore GPS receiver may be obtained by using high-resolution time interval counter, and the time difference between GPST and certain satellite clock may be obtained by reading navigation message from GPS receiver. As a result, the time difference between local clock and certain satellite clock may be calculated, and the one-site measurement of GPS common-view may be implemented. For ensuring the strict common-view, a synchronized control strategy using multi-thread mechanism and an auto-detecting block is designed. The raw data of actual short-baseline single-channel common-view measurement shows that the Root-Mean-Square is better than 4.9ns. The system may be widely used in time synchronization in Synchronous Digital Hierarchy (SDH) communication network and exchange and other timing application cases.
出处
《电子测量与仪器学报》
CSCD
2005年第2期15-19,共5页
Journal of Electronic Measurement and Instrumentation
基金
国家自然科学基金资助项目 (6 0 172 0 31)