【Key words】 BD System； GPS System； Time Interval Measurement； Frequency Calibration； Time Synchronization；
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At first,the principle of the satellite dual-mode time service technology was explained,the precision of time service of GPS and BD system has been tested.
本文首先阐述了卫星双模授时技术的原理,并对GPS和北斗系统的授时精度进行了测试。
参考来源 - 卫星授时校频系统研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The BD + system protects movies if pirates should develop mod chips for Blu-ray players or develop Blu-ray player software that allows movies to be copied.
如果盗版者想开发Blu - ray播放机的破解芯片或者开发允许拷贝的播放软件时，BD +系统能对电影提供保护。
Conclusion Fibrinolytic system may play some role in the pathogenesis of BD, and seems to have close correlation with activity of the disease.
结论纤溶凝血系统可能在BD发病机制中起一定作用，并与疾病活动有密切相关性。
This paper designs an optical system and some lenses for the BD OPU, including collimator lens, beam shaping lens for laser beam shaping, and cylinder lens for signal detecting.
本文设计了一套蓝光光学读取头的光路系统，包括用于光束处理的准直镜，整形棱镜，还有用于信号探测的柱面镜。
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