摘要
针对以往卫星通信终端系统均有授时秒脉冲精度不高的问题,设计了为精密时间测试仪提供精确基准秒脉冲及授时信息的系统,充分利用高稳定性的GPS和高可靠性的BD组成的双系统冗余的设计思路,采用FPGA+DSP构架作为中央控制单元,结合双模授时无损切换技术、BNC占位及优化秒脉冲3个关键技术,为各种地面测控设备提供统一的时间基准,保证各测控设备之间在时间上高精度同步性;实验结果表明:该系统可以为时间间隔测量仪提供平均精度可达20ns的秒脉冲,可靠性高。
Aim at the problem that the precision of the past satellite communication terminal system isn＇t high,designed a system that can provide accurate and standard PPS and timing information for the testing instrument of precision time,used the idea of high-stability GPS system and high-reliability BD system to design a dual-model redundancy system,FPGA and DSP are used as a central control core,com bined the key technology of undamaged dual-model timing,the placeholder optimization of BNC and optimizing of PPS model,provided a unified time standard for all kinds of ground testing control equipments to ensure the high-precision synchronization on time among testing control equipments.Testing results show that this system can provide 20ns PPS of the average accuracy for time interval measuring instrument,and the reliability is high.
出处
《计算机测量与控制》
2015年第2期574-576,共3页
Computer Measurement &Control
基金
国家青年科技研究基金(2012021013-4)
