Table of Content

15 February 2012, Volume 32 Issue 1

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Attenuation Measurement System based on IF Substitution Method

LIU Jie;ZHANG Guo-hua;YANG Chun-tao;GAO Chun-yan

2012, 32(1):  1-4.  doi:10.12060/j.issn.1000-7202.2012.01.01

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An accurate microwave attenuation measurement system developed by Beijing Institute of Radio Metrology and Measurement based on IF (Intermediate Frequency) series substitution method is described in this paper. This system employs an Aemi-automated Inductive Voltage Divider (IVD) as a reference standard. And it is greatly improving the measurement accuracy. The Semi-automated inductive voltage divider, experimental measurement system, measurement results and further improvement is discussed in detail. This system can perform accurate measurement from 10MHz to 18GHz covering the attenuation range of 80dB.

The Design and Realization of the Amplitude Stabilizer for Mid-power Standard

XU Chuan-zhong;YANG Xu-jun;LIU Ting

2012, 32(1):  5-9.  doi:10.12060/j.issn.1000-7202.2012.01.02

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The signal amplitude stabilizer is usually applied in the mid-power standard to decrease the mismatch error. A new amplitude stabilizer used in mid-power standard is presented in this paper. The configuration and the circuit diagram are introduced firstly, and then every function module of the amplitude stabilizer also gets detailed analysis. The measurement results show the validity for the amplitude stabilizer presented above. Now this new kind of amplitude stabilizer has achieved good application in mid-power measurement.

Design and Implementation of the Timekeeping Experiment Platform

LI Bian;CHENG Hua-jun

2012, 32(1):  9-12.  doi:10.12060/j.issn.1000-7202.2012.01.03

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Timekeeping is one of the main missions at each time laboratory. The time scale UTC(NTSC), which is used the standard time in various fields reference directly or indirectly in China, is generated, kept and transmitted by the National Time Service Center (NTSC), the Chinese Academy of Sciences. However, equipments for UTC(NTSC) timekeeping are in operation, and do not have the conditions as the experiment platform at NTSC. They block timekeeping researches of UTC(NTSC). In order to solve this problem, an automatic monitor experiment system has been built by analyzing hardware and software of timekeeping system. This platform, which possesses the timekeeping function, can be used for researches on timekeeping aspects.

A Method to Measure the Time Delay for the Loran C Timing Receiver

CHE Ai-xia;WANG Yu-lin;LIU Chng-hong;JI Dan

2012, 32(1):  13-16.  doi:10.12060/j.issn.1000-7202.2012.01.04

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The transformation course is analyzed for the Loran C time signal to be emited、transmited and received,then,the time delay expressions are educed for the Loran C timing receiver with a loop-antenna or a pole-antenna,a method is put forward to measure the time delay  for the Loran C timing receiver accurately, and a set of measurement result is showed.

Research and Development of High-precision Atom Frequency Standard Comparator

WANG Xiao-lu;HUANG Kai;YANG Tong-min

2012, 32(1):  17-21.  doi:10.12060/j.issn.1000-7202.2012.01.05

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High-precision Frequency Standard Comparator is a kind of instrument to measure frequency stability. It adopts the means of time interval difference and multiple frequency difference. Test results show that its actual frequency stability can be as high as 5.0E-14/1s.

Time Interval Measurement based on Surface Acoustic Wave Dispersive Delay Line Excitation

BU Zhao-hui;DU Yan;HUANG Pei-cheng

2012, 32(1):  22-25.  doi:10.12060/j.issn.1000-7202.2012.01.06

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High-precision time interval measurement techniques play a significant role in the economy and the military. The paper deals with a novel high-precision time interval measurement method up to 1 ps or even higher precision. The method utilizes a surface acoustic wave dispersive delay line as a time interpolator. The time interpolator can have the form of a time stretcher, so as to get many observations. Thanks to possible averaging, the overall error can be greatly reduced. It’s indicated, by the theoretic analysis and experiment, that the time interval measurement method is practical with high precision.

A Clock Errors Prediction Model based on Grey Model and ARIMA Model

SONG Hui-jie;HOU Juan

2012, 32(1):  26-29.  doi:10.12060/j.issn.1000-7202.2012.01.07

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Because of the influence of many factors, the running of an atomic clock is very complex. The atomic clock has high frequency, is very sensitive and extremely easy to be influenced by the outside world and its own factors. So it is very difficult to master its complicated and detailed law of change. With the above characters, a combination model method for clock errors prediction based on grey model and ARIMA model is proposed. The basic ideas, prediction models based on grey model and ARIMA model are discussed, respectively. Compared with the grey system model and ARIMA model, a careful precision analysis of combination model prediction is made to verify the feasibility and validity of this proposed method by using the performance parameters of atomic clocks. The simulation results show that the prediction precision of this combination model is much better.

A GPS-Rubidium Clock Synchronization System based on FPGA and TDC

YANG Jun;CHEN Zhi-yong;YU Fang;TANG Chao;SHENG Rong-wu

2012, 32(1):  30-33.  doi:10.12060/j.issn.1000-7202.2012.01.08

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In this paper, a high-precision time and frequency synchronization system is proposed, which works with GPS and GPS-disciplined rubidium clock. The system outputs a standard 10MHz frequency and a high-precision 1PPS time signal. With the tameness of GPS, the synchronization accuracy of the system can be reached 7.2 ns, and the accuracy of the standard 10MHz can be better than 1E-12. Analysis of the principle and the implementation of the system are presented in detail, and test data is given. The result demonstrates that the indicators of the system meet the engineering requirements.

Phase Difference Measurement of Sinusoidal Signal based on Multi-layer Cross-correlation

ZHENG Sheng-feng;CHEN Su-ming;DI Jin-hai;WANG Ben-yi

2012, 32(1):  34-40.  doi:10.12060/j.issn.1000-7202.2012.01.09

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A new method for phase difference measurement is introduced in this paper. Because the sinusoidal signal has a particular trait, do cross correlation to the two signals to get cross correlation function and keep the phase difference information. Multi-layer cross-correlation function is obtained by multi-layer cross correlation calculation to the cross-correlation function, and phase difference is obtained by using correlation theory. Length of sampled data, signal-noise ratio，number of ADC quantization bits and harmonic content which influence precision of phase difference measurement are particularly discussed and analyzed. Simulation results and conclusion are given. The simulations proves its feasibility and effectiveness to detect the phase difference.This method has many virtues such as simple theoretic deduction and explicit physical signification.It is especially fit for low signal-noise ratio condition or negative signal-noise ratio condition and it can get high resolution.

Review of the Precise Traceability of Time and Frequency based on BeiDou / GNSS Transfer

GU Sheng;CHEN Hong-qing;ZENG Liang

2012, 32(1):  41-44.  doi:10.12060/j.issn.1000-7202.2012.01.10

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This article describes the research progress of the precise metrology system of the BeiDou/GNSS time and frequency transfer and its application, through the research on the common-view of the BeiDon system, design the GNSS CV precise time service system to compare with the National Time Service Center, in order to achieve the traceability of the standard time UTC. At the same time completes to design the GNSS CV time and frequency metrology service system, which innovatively gives the way to improve the common-view of BeiDon satellite system and develope the multi-mode and multi-frequency GNSS CV transmission equipments.

A Testing Facility for Photoelectric Tracker Optical Axes Boresight

SHI Xue-shun;HU Guang-liang;CUI Peng;WANG Heng-fei;CHEN Kun-feng

2012, 32(1):  45-48.  doi:10.12060/j.issn.1000-7202.2012.01.11

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The optics system of large aperture parabolic mirror collimator is designed. The laser beam coordinate extraction system based on image acquisition and processing is developed. The displacement close-loop control system based on raster ruler is developed. The testing facility for photoelectric tracker optical axes boresight is implemented. The facility can be used to measure the optical axis boresight between laser, infrared, TV, visual system of photoelectric tracker.

The Analysis of the Measurement Method and the Measurement Uncertainty for Noise Source

ZHANG Xi-fu;ZHANG Qiang

2012, 32(1):  49-55.  doi:10.12060/j.issn.1000-7202.2012.01.12

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One of the key performance parameters for noise figure is the level of measurement uncertainty. A significant contributor to this is the uncertainty surrounding the noise source used when measuring noise figure on the device. Accurate noise source calibration is critical to minimizing noise figure uncertainty, and thus a critical factor for obtaining quality noise figure measurement. In this paper, two methods of Y-Factor and Gain are introduced to measure the microwave and millimeter-wave noise source, and the measurement uncertainties are also studied.

The Design of Test Equipment on-ground to Assure Manipulation Security of Payload

WANG Shuai;GAO Ming-hui;WANG Wen-hua

2012, 32(1):  56-60.  doi:10.12060/j.issn.1000-7202.2012.01.13

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 In the process of space payload development, the test equipment on-ground is indispensable because the payload must has been tested through and calibrated before its launch. To assure manipulation security of payload on-ground, this paper focuses on the security design of the test equipment on-ground to protect the payload against any damage and to keep it in good condition. We implement the test equipment access control through a kind of IC card-reader to restrict all of operators’ manipulation. Then every manipulation to the payload through equipment will be registered to be the manipulation log. The test equipment will check every manipulation validity before it is executed so that the mishandling can be shielded to avoid any damage to the payload. The security design of test onground can keep away any mishandlings which are unavoidable for operators and make the process of test under control.

Research on Instrument Driver Development based on MATLAB Instrument Control Toolbox

WEN Tian-zhu;SHANG Yong-shuang;ZHAO Kang

2012, 32(1):  61-64.  doi:10.12060/j.issn.1000-7202.2012.01.14

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First the way of passing information between the MATLAB workspace and instrument was described. Second taken Ag34401A for an example, the development process of instrument driver was analyzed, and the functionality of instrument driver was verified by MATLAB instrument driver testing tool. At last the instrument control was implemented by test and measurement tool.

Research on Test Technology for Virtex-E Series FPGAs

LIU Qian;WU Dan;ZHANG Ting;SHEN Sen-zu

2012, 32(1):  65-68.  doi:10.12060/j.issn.1000-7202.2012.01.15

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FPGA is a very important device which is being widely used in IC design and many other areas. With the rapid development of FPGAs, test technology for FPGAs is becoming more and more complicated. This paper takes XILINX Virtex XCV300E for example, studies the test technology for FPGA based on 93000 test system.

A Circuit Design and Realization of a Dual-Mode Wireless Network Card based on Mini PCI-E

SUN Guo-fu;CHEN Shi-ru; LI Nuo

2012, 32(1):  69-74.  doi:10.12060/j.issn.1000-7202.2012.01.16

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A WiFi / WAPI dual-mode WLAN card circuit design based on mini PCI-E specification is introduced, whose implementation is based on HED05W01SU chip and AL2230S chip, including hardware design, software design and test program.  In the aspect of hardware design, the RF chip interface design, the baseband chip interface design and the mini PCI-E interface design are included.  In the aspect of software design, the driver software and the management software for WLAN card working in Windows OS environment are presented. Based on the GB15629.11 specification, the test program is added for verifying the WLAN card development, and the test results meet the specification requirements. High integration, simple interface, inexpensive and easy to operate is the WLAN card marked properties.

Application of Empirical Bayes Ridge Estimation in Instrument Error Identification of GINS Vehicle Test

LIU Ming;WANG Hai-jun;GUO Qing-ye;JIANG Xiao-xiong

2012, 32(1):  75-78.  doi:10.12060/j.issn.1000-7202.2012.01.17

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During the identification of instrument error of gimbal inertial navigation system vehicle test, there is a serious multicollinearity exit in this system because the input acceleration is small. Application of the conventional least squares method can bring some questions, such as the variance may be enlarged and the parameter estimated value unstable and so on. In this paper, the empirical Bayes ridge estimation is proposed in the instrument error identification of GINS vehicle test. The simulation results showed that compared with the conventional least squares method, the empirical Bayes ridge estimation can enhance the precision of the parameter identification and can overcome the influence of the multicollinearity.