【摘 要】
：
汞离子微波钟具有优异的频率稳定度和极低的漂移率,能够实现长期连续运行和小型化,是新一代地面守时和空间应用原子钟的理想选择.现有汞离子微波钟真空系统是由分子泵维持,体
【机 构】
：
中国科学院原子频标重点实验室, 武汉 430071
论文部分内容阅读
汞离子微波钟具有优异的频率稳定度和极低的漂移率,能够实现长期连续运行和小型化,是新一代地面守时和空间应用原子钟的理想选择.现有汞离子微波钟真空系统是由分子泵维持,体积、功耗都很大.为了实现真空系统的小型化,我们研究了吸气泵维持密封真空系统的方法,设计并研制出采用密封真空系统的小型化汞离子微波钟样机,体积为16.4L,重量15.1kg,功耗66W.该样机的密封真空系统已经维持了一年；通过与氢钟比对,测得短期稳定度8×10-13/τ1/2(τ=1～104s),天稳定度优于4×10-15.
其他文献
研究在声波定位中基站布局对定位精度的影响.该论文对声波定位中精度的影响进行分析,得出在声波定位时的影响因素,即基站的几何布局与定位误差之间的关系；对基站布局进行各种
海洋环境里声速随着盐度、温度和深度以及其他因素的变化而变化,导致声波并不沿直线传播即声线弯曲.对于高精度水声定位系统,声线跟踪技术已成为克服声线弯曲影响、提高定位
近年来武汉地区暴雨频繁发生,对人民生命财产造成了重大危害.暴雨的发生与大气可降水量有很大联系,上世纪80年代国外学者Askne构建了地基GPS反演大气可降水量模型,随着研究的
Various forms of faults have a significant impact on the performance of navigation systems, especially satellite navigation system faults occur most frequen
The long pseudo-noise codes have the advantages of strong anti-interference capability and high ranging accuracy, which has been used in GPS, Compass and ot
Nowadays, the position and posture of moving objects are playing more and more important roles in space flight, navigation, target tracking and so on. It is
Multi-rotor UAVs have been highly valued in both military and civilian applications for its low cost and excellent maneuverability in recent year. Most mult
In the past 20 years, various innovative technology patents of BeiDou Navigation Satellite System (BDS) emerge in endlessly. Patent analysis is a practical
The ionospheric delay has a very important influence on the positioning accuracy of satellite navigation. It can be effectively reduced by establishing an a
According to the rare existing researches of RDSS position service of satellite navigation system, this article evaluates RDSS position service performance