The ZEEMAN frequeney is one of important working parameters of hydrogen maser frequency standards, so a special digital time and frequency synthesizer, which is used to measure ZEEMAN frequencies, was developed.

The Majorana transition and the beam optics configuration are analysed for the purpose of designing the hydrogen maser state selector.

分析了氢脉泽中Majorana跃迁和双聚焦束光学系统。

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The hydrogen maser is the most stable frequency standard generally available today for all but the shortest measuring times. For long measuring times of 10 4s or longer, its performance typically deteriorates due to frequency drift of high Q resonant cavity.

氢脉泽是至今为止除极短时间测量间隔之外最稳定的频率标准，对于104s或更长的测量时间间隔，它的性能由于高Q值谐振腔而引起频率漂移而变坏。

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Analysis of the Majorana Transition Used with H-maser: Single State Selector and Beam Optics

氢脉泽中Majorana跃迁的分析：单态选择与束光学

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A new hydrogen maser for VLBI-network in China has been developed at Shanghai Observatory.

一种用来装备中国VLBI网络的新型氢脉泽标准已在上海天艺台研制成功。

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An Experimental Study for the Compact Hydrogen Maser with a TE_ ( 111) Septum Cavity

小型TE（111）无泡隔膜腔氢脉泽的实验研究

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This paper describes a measurement method for experimental estimating oscillation parameter q of hydrogen maser.

本文介绍一种实验估算氢脉泽振荡参数q的测量方法。

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Experimental Estimation of Hydrogen Maser's Oscillation Parameter q and Diagnostic Technique of Hydrogen Maser

氢脉泽振荡参数q的实验估算及氢脉泽诊断技术

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In order to supplying the laser source for the 3D optical lattice in our Yb atomic clock experiments, we design an injection-locked Ti: sapphire laser at 759 nm by taking the advantages of the injection locking technique and the Ti: sapphire laser.

为此，结合注入锁定技术和钛宝石激光器的优势，我们旨在实现高功率、窄线宽、频率稳定的注入锁定钛宝石激光源，为冷镱原子光晶格钟的实验研究提供三维光品格光源。

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However, the optical lattice clocks of neutral atoms can simultaneously interrogate a great number of cold atoms in the optical lattice and therefore outperform the single ion clocks for higher stability.

而中性原子光晶格钟能同时探测大量囚禁在光晶格中的原子，其稳定度远远高于离子光钟。

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Optical lattice clock based on neutral atoms with high accuracy is regarded as one of the candidate of next generation frequency standard, and is widely studied in recent years.

中性原子光晶格钟作为一种高精度原子钟，被视为下一代频率基准的候选研究对象，受到人们的广泛关注。

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BeiDou is the world's fourth navigation satellite system, with the others being the US' GPS, Russia's GLONASS, and the European Union's Galileo.

北斗是全球第四大导航卫星系统，其他三大系统分别是美国的全球定位系统，俄罗斯的格洛纳斯系统以及欧盟的伽利略定位系统。

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Building on a Soviet-era foothold, Russia is expanding its monitoring stations for Glonass, its version of the Global Positioning System.

俄罗斯正在以一个苏联时代的驻扎点为基础，为他们的格洛纳斯系统（Glonass）拓建观测站，这是该国自行开发的全球卫星定位系统。

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It will be the fourth global satellite navigation system after GPS, GLONASS and Galileo.

这将是继GPS（美）、格洛纳斯（俄）和伽利略（欧）之后的第四个全球卫星导航系统。

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Building on a Soviet-era foothold, Russia is expanding its monitoring stations for Glonass, its version of the Global Positioning System ( GPS).

建立在苏联时期的据点，俄罗斯正扩展其格洛纳斯监测站，俄罗斯的全球位置测定系统。

六级真题- 2016年 12月 2卷 信息匹配

On this basis, a variety of complex topography simulation test has been carried on, and each wheel slip rate can be efficiently controlled. The ability of climbing, cross obstacle and ravines have been strengthened effectively.

以此为基础，对多种复杂地形进行了仿真试验，该模型可高效控制各轮滑转率，增强了巡视器的爬坡能力、通过沟壑以及跨越障碍的能力，适用于巡视器的工程应用条件。

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The traction control model based on wheel slip model was put forward based on the kinematic model of six-wheeled rocker rover, and can be solved by the linear quadratic optimal control method.

基于六轮摇臂巡视器运动学模型，建立了基于车轮滑转动力学模型的牵引控制模型，并利用线性二次型最优控制法对其求解。

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In January, Chang'e-4, a Chinese robotic spacecraft including a small rover, became the first ever to land on the far side of the moon.

1月，中国的嫦娥四号机器人探测器携带一台小型巡视器历史上首次在月球背面着陆。

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With the implementation of the 2nd stage of Chang' e project, lots of simulation experiments are needed for the development and exploitation of Lunar Rover.

随着嫦娥二期工程正式实施，在月面巡视器的研制与开发中，前期的各种仿真实验必不可少。

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Influences Analysis of Moon Surface Terrain on the Rover Antenna Direction

巡视器对地指向受月表地形的影响分析

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A rover will be released after the landing to conduct scientific exploration.

着陆后，巡视器将开展科研探测。

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