频标

单纵模激光具有良好的方向性、单色性和相干性，因此，在精密计量、光通信、光频标、高分辨光谱学等领域中得到了广泛的应用。

Single longitudinal mode laser has good characteristics such as coherence and monochromaticity . Therefore , it is widely used in accurate measurement , optical communication , optical frequency scale , high resolution spectroscopy .

高Q值小型化氢频标蓝宝石微波腔的实验研究

Experiment Study on a High Q Sapphire Loaded Microwave Cavity for Compact Hydrogen Frequency Standard

一种小型化铷原子频标TE（111）微波腔研究

Research of A Miniature TE_ ( 111 ) Microwave Cavity for Ru-Frequency Standard

光抽运汽室~（87）Rb频标中的微波功率频移

Microwave-power frequency shift in optically pumped ~ ( 87 ) rb cell frequency standard

在铷原子频标中，需要产生带有小数频率的微波信号，DDS（Directdigitalsynthesis）逐渐成为实现该频率的最佳手段。

In the Rubidium frequency standard , It is necessary to generate a fractional frequency signal . So DDS ( direct digital synthesis ) is optimal candidate .

对于一个实用的氢频标来说，其频率稳定度的测试，特别是实时稳定度测试，腔体调谐与线Q值的测试都是必不可少的。

For a hydrogen atomic frequency standard . Measurement of it 's stability , especially real-time stability , cavity tuning and line Q must be done .

一种CPT频标小体积低功耗温控电路的研制

A Temperature Control Circuit with Small Size and Low Power Consumption for CPT Atomic Frequency Standard

该方案为实现高性能微型化CPT原子频标克服了一项重要技术阻碍，可望大幅改善微型CPT原子频标的频率稳定度性能。

This technological breakthrough overcomes a main obstacle for realizing high performance miniature CPT atomic frequency standard .

用Fokker-planck方程对量子频标伺服环跳周的分析

Analysis of the Cycle-slipping of the Servo-loops in Quantum Frequency Standard with Fokker-planck Equation

最小的CPT原子频标可为手表尺寸，用纽扣电池供电。

The smallest CPT frequency standard is expected to be of watch size and supported with a Button battery .

氢原子频标在VLBI国际联测中的应用及影响其性能的主要因素分析

Application of hydrogen atomic frequency standard in VLBI international united testing and analysis on main factors affecting its performance

实验结果表明：改进后的特征参数比传统Mel频标倒谱系数具有更高的识别率和更好的抗噪性能。

The experimental results show that the improved feature parameters can achieve higher recognition rate and better anti-noisy performance than the traditional feature parameters .

系统采用带调音节作为识别基元，Mel频标倒谱系数作为特征参数、隐马尔可夫模型作为识别模型，并对其进行实验，分析系统的性能。

This system chooses the syllable as recognition unit , the MFCC as feature parameters , and the Hidden Markov Model as recognition model .

在国内阿仑方差（AllanVariance）通常用来表征原子频标的频率稳定度。

In our country Allan Variance usually be used to express frequency stability of atomic frequency standard , and Hadamard Variance usually be used to do the same at external .

最后再利用模数混合仿真工具PSpice，分开环和闭环两种情况对铷气泡频标进行了仿真分析和实验验证。

Using analog / digital mixed simulation tool-PSpice , the RFS system output response was analysed and validated under the condition of open loop and closed loop .

本文在分析传统Mel频标倒谱系数提取过程的基础上，结合小波包分析和滤波器加权分析，提出了一种新的特征参数提取方法。

Based on analyzing the traditional Mel frequency cepstral coefficients extraction , wavelet packet and weighted filter , a new method of feature extraction is proposed .

XSR型铷原子频标的检修

Overhaul of XSR type of Rubidium atomic frequency standard

532nm碘分子光频标

532 nm Iodine Molecular Optical Frequency Standards

本文对铯原子频标中的Majorana跃迁频移进行理论上的探讨。

The Majorana transition frequency shift in cesium beam atomic frequency standards is theoretically investigated in this paper .

SOHM-4与MHM-2010氢原子频标的特点比较

A Comparison of Characteristics of SOHM-4 and MHM-2010 Hydrogen Masers

第二章详细讲述了CPT原子频标的物理系统工作原理和我们团队最近实现的CPT原子频标方案。

In Chapter II it is described in detail that the working principle of physical package of CPT frequency standard and the overall scheme of recently developed CPT frequency standard prototype of our team .

对我厂的频率标准XSR型铷原子频标发生的故障及具体检修情况作了较详细的分析和介绍。

Analyses failures of XSR type of Rubidium atomic frequency standard used in our factory , and introduces the situation of particular overhaul in detail .

语音特征参数MFCC（美尔频标倒谱系数）是语音识别中最有效的特征参数之一，但由于MFCC参数的计算量太大而限制了其在低端嵌入式平台的应用；

The speech feature parameter Mel Frequency Cepstrum Coefficient ( MFCC ) is one of the most effective feature parameter in speech recognition . But its amount of computation is too large to apply to low embedded platform .

由于这些特点，CPT原子频标在远程通讯系统定时、大范围通讯网络同步、武器装备的便携化等军、民用方面具有很好的应用前景。

Because of these advantages , it is believed that CPT frequency standards are promiseful in long-term application in military and civilian area , such as long-distance communication systems timing , large-area network synchronization and the portability of weapons and equipment .

本文介绍根据《铯原子束频标中的Majorana跃迁频移》一文的理论分析结果进行的一些实验。

This paper presents some experiment results based on the theoretical analyses given in the paper " The Majorana transition frequency shift in cesium beam atomic frequency standards " published in 1983 .

报告了实现钙原子光频标的前期工作&钙原子束的光学Ramsey谱线研究的初步工作，介绍了实验的系统方案、真空和激光器部分的设计以及部分已完成的工作。

The preliminary work on optical Ramsey spectroscopy , which is the first step to accomplish a calcium optical frequency standard , is reported . The system scheme of this experiment , the design of vacuum setup and laser system , and some completed work are described .

本文阐述了应用于激光抽运铯束频标的Littman-Metcalf外腔结构的外腔半导体激光器的研究情况。

A set of external cavity diode laser ( ECDL ) with a Littman-Metcalf configuration , which will be used for the optical pumped cesium frequency standard , is reported in this paper .

利用频率变换和频率合成技术，将电信时钟信号频率转换为1MHz整数频率，再利用现有的频标比对器，实现电信时钟信号频率和频率稳定性的高准确度测量。

Using frequency transformation and frequency synthesis techniques , we transferred electric commumication clock signal to 1 MHz integer frequency . realized high accuracy measurement of electric communication clock signal frequency and frequency sta - bility utilizing existent frequency comparator again .

本文介绍在某工程上应用的上海天文台工程型氢频标10ms级频率稳定度的改善措施和在采样时间为10ms时，对氢频标频率稳定度测量的结果。

The paper mainly describes how to improve frequency stability of H-maser frequency standard , which is used in the field of engineering , for an averaging time of 10ms at Shanghai Observatory . The result of its frequency stability for an averaging time of 10ms is obtained .

小型化铷原子频标电路设计

The Circuit Design of Frequency Standard in Miniaturization Rubidium Atomic System