Table of Content

15 October 2012, Volume 32 Issue 5

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Errors Analysis of Quasi Optical Open Cavity Measurement System at Millimeter Waves

GUI Yong-feng；DOU Wen-bin

2012, 32(5):  1-7.  doi:10.12060/j.issn.1000-7202.2012.05.01

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Errors analysis of quasi optical open cavity, which is used to measure the complex dielectric constant of the dielectric plate accurately, is presented. The errors from the approximating theory and the errors due to the measurement system and measurement process are described. The formulas are deduced, and the simulation results and measurement results are presented.

The Analysis of Mainlobe Suppression Jamming on Phased Array Radar

CHEN Dian-yu

2012, 32(5):  8-12.  doi:10.12060/j.issn.1000-7202.2012.05.02

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In this paper, firstly, the mathematical character of Noise FM jamming is discussed which is the main form of suppresion jamming. Secondly, the influences of Noise FM jamming on phased array radar are presented in terms of narrowband self-defence distance, wide-band imaging to find weakness of anti-jamming for radar. At last, according to present document, the method of anti-jamming for phased array radar is simulated to test its performances.

Processing of Noise In Frequency Stability Measurement of Atomic Clocks

LI Shu-zhou；LIN Yu-ting；ZOU Ben-jie

2012, 32(5):  13-16.  doi:10.12060/j.issn.1000-7202.2012.05.03

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Measurement noise of atomic clocks influences the evaluation of frequency stability, especially for the short term and medium term frequency stability. Overlapping Allan variance can overcome in-stability due to FFM and RWFM noise variety along with time, but the result is influenced by measure noise. The method of evaluating frequency stability for atomic clocks is given basing on mathematic model and noise characteristic of atomic clocks. A processing method using smoothing window is presented. The noise of time difference sequence is restrained through adding window and smoothing. A experiment is executed with time difference sequence of rubidium clock, and the result shows that the reliability of short term stability(100~1 000)s can be improved by 100 points smoothing method.

The Designment and Implemention of Atomic Clock Long-term Characteristic Measure System

YANG Xi；XU Yue-qing

2012, 32(5):  17-21.  doi:10.12060/j.issn.1000-7202.2012.05.04

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By setting up kinds of time and frequency measurement hardware,we establish a measurement system which can implement many atomic clock compare with local freqency standard at the sametime.This system which is suport with data-base servic in the bottom can survey the measurement data in the real time,show the frequency accuracy of the current measured atomic clock,and after get more appropriate data,it can also calculate and show the result and curve of the day stability and the drift of time.This system can be convenient for the operation of measurement person and improve the efficiency of the measurement on the measured atomic clock.

Research on Time Keeping Algorithm of the Autonomous Navigating of Navigation Constellation

YI Hang；ZHONG Chong-xia

2012, 32(5):  22-26.  doi:10.12060/j.issn.1000-7202.2012.05.05

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Autonomous timekeeping is one of the key techniques for the autonomous navigation of navigation constellation which plays an important role in improving the viability of the navigation constellation, while the algorithm of jointed atomic time scale on board is the key of autonomous time-keeping. In this paper, both the two algorithms based on weighted average and EKF are used in the calculation of jointed atomic time scale on board. The simulation results prove that both the two algorithms can keep the clock error within 25ns in a period of 240 days.

Evaluation and Analysis of Uncertainty of Bandwidth Measurement of Digital Oscilloscopes

FU Yong-jie

2012, 32(5):  27-30.  doi:10.12060/j.issn.1000-7202.2012.05.06

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In order to realize the evaluation of bandwidth measurement of digital oscilloscopes, according to the method of digital oscilloscope calibration standard, measures the bandwidth of oscilloscopes. In this paper, analyses the uncertainty sources of measurement result. To Agilent DSO6052A digital oscilloscopes as an example, the paper introduces the measurement result uncertainty evaluation process of the bandwidth of digital oscilloscopes, and given the evaluation results. Practice proves that the method is correct and effective, which can be referenced for writing oscilloscope verification device standard report and evaluation of bandwidth of oscilloscopes.

The Recent Technique Trend and Progress of Quantum Metrology on Electricity

HUANG Xiao-ding；CAI Jian-zhen；WANG Lu

2012, 32(5):  31-35.  doi:10.12060/j.issn.1000-7202.2012.05.07

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Recent progress of DC voltage and Quantum hall resistance of electrical metrology are introduced. The AC voltage and AC Quantum hall resistance have some breakthrough, which are discussed here. Moreover, electrical quantum triangle relation and its verification are present in this paper. Finally, the using in mass unit definition and Plank constant measurement of electrical metrology technique is also introduced here.

Maximum Power Point Tracking of Photovoltaic Array based on PSO

XUE Lei；ZHAO Jian-hui；LI Fan；HAO Bo

2012, 32(5):  36-40.  doi:10.12060/j.issn.1000-7202.2012.05.08

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Under partially shaded conditions, the reverse of avalanche effect occurs in the shadow of photovoltaic cells, resulting in multiple local maxima in the output power of photovoltaic array, then the conventional MPPT failures. This paper built the model of photovoltaic array under partially shaded conditions based on the perfect model of photovoltaic cells and verified the multipeak characteristics of the output power. The paper proposed a global MPPT control method based on PSO, and improved the tracking speed by accumulating search experience of individual particle. The simulations indicate the MPPT method can track the global maxima quickly when the external conditions change and make full use of energy in the end.

Uncertainty Analysis of High Capacitance Calibration by Series Capacitor Method

WU Kang；LI Ya-lu；LIU Min

2012, 32(5):  41-44.  doi:10.12060/j.issn.1000-7202.2012.05.09

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The article analysis and calculate uncertainty of 10μF~1mF high capacitance’s measurement results by series capacitor method which standard are high accuracy bridge AH2700A and standard capacitor Agilent 16380C（1??F）.Via uncertainty analysis, measurement uncertainty of capacitor of 10??F is 0.02%,measurement uncertainty of capacitor of 100??F is 0.1%, the measurement uncertainty of capacitor of 1mF is 0.6%.

Designing and Implementation of Automatic Calibration System for Multi-channel Data Collector

XU Xing-ming；LIU Guo-wei

2012, 32(5):  45-48.  doi:10.12060/j.issn.1000-7202.2012.05.10

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Data collector has been widely used in the research and production field. According to the defects of automatic calibration for data collector, this paper design a new calibration system based on programmable multiswitch, and introduces the design of hardware and principle of test, and test system software. This system is reasonable and reliable．It can be extended easily and of great generalize value.

Development of a Calibration Device of Low Temperature Blackbody with Large Aperture

DAI Ying-hong；WU Jian-feng；ZHANG Ya-zhou；ZHANG Guang；XU Gang

2012, 32(5):  49-52.  doi:10.12060/j.issn.1000-7202.2012.05.11

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A calibration device of low temperature blackbody with large aperture is developed in the need of measuring more ranges. This device adopts working medium refrigerating technology to avoid using large amount of liquid nitrogen. It adopts upright radiating plate to convenient for IR camera operation. It also adopts dual parameter linkage control to realize high accuracy temperature control in wide range. This device uses anti-frosting technology, temperature revision and correction technology to lay solid foundation for calibration standard establishment.

Optimal Design of the Nonlinearity Factor Measurement about Optical Fiber Power Meter

QUAN Zhi-ke；GAO Ye-sheng

2012, 32(5):  53-55.  doi:10.12060/j.issn.1000-7202.2012.05.12

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The optimal design of nonlinear factor measurement system for fiber power meter is given.Through the basis of analyze and experiment，the optical system is improved, the impact for optical power stability caused by the interference effect is confined，the result has been proved by the experiment;optical switch is used optical attenuation instead of the shutter，measurement range is more higher than before.

Research on a Fast Measurement Method of Engine Thrust Line

LI Wei-sen；LI Lei；DU Chang-da

2012, 32(5):  56-60.  doi:10.12060/j.issn.1000-7202.2012.05.13

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Taking a certain type of engine nozzle as the measurement object, this paper proposed a rapid measurement method-using high-precision noncontact measuring instruments, such as laser radar, to measure engine thrust line. The error simulation analysis shows that this method has high measurement accuracy, high measurement speed and low cost. Therefore, it has broad space for development in the aerospace engineering measurement system.

Research on Section Area Measurement Technology of Variable Volume Chamber for Constant-pressure Gas Flow Meter

ZHAO Lan；FENG Yan；CHENG Yong-jun；ZHANG Di-xin；ZHANG Rui-fang

2012, 32(5):  61-64.  doi:10.12060/j.issn.1000-7202.2012.05.14

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For developing constantpressure l gas micro-flow meter, the bellows variable volume chamber has been designed. And the section area has been measured. The section area value of bellow variable volume chamber is corrected by polynomial formula to avoid non-linearity effect of bellows. The corrected deviation is less than 0.16%, and the relative combined standard uncertainty of measurement is less than 0.53%.

Design of Verification System for a Certain Type Missile Test Equipment

WANG Wei-hua；YU Jian-hua；JIANG Feng

2012, 32(5):  65-67.  doi:10.12060/j.issn.1000-7202.2012.05.15

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According to a certain type missile test equipment, the paper study on special verification system .The author used GPIB telecontrol technology and general adapter technology .The design of software based on virtual instrument technology which can increase interaction and flexibility of the system.

The Present Situation on Non-contact High Temperature Measurement Technology

ZHANG Hu；LI Shi-wei；CHEN Ying-hang；SUN Guang-wei；WEI Jian-qiang；LIU Ya-ping；SUN Peng-fei

2012, 32(5):  68-71.  doi:10.12060/j.issn.1000-7202.2012.05.16

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Non-contact high temperature measurement technology is already the main solution for temperature measurement above 2 000℃. It is very important for national defence technology and industry especially some key technology areas for example heat-defence and stealth performances of high-speed aircraft. In this paper， some kinds of non-contact high temperature measurement technology are commented. The statuses,defects and advantages and forground are compared. Furthermore， the future of non-contact high temperature measurement technology is prospected.

Established and Practiced of Measurement Management System based on Network

LI Bing

2012, 32(5):  72-75.  doi:10.12060/j.issn.1000-7202.2012.05.17

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This article discusses the important effect and status of measurement management and brings up a new model of measurement management-measurement management system of two grades based on network. In the end，a basic scheme and result is given.

Research on Development of Army-civilian Integration for Military Metrology

REN Wei

2012, 32(5):  76-78.  doi:10.12060/j.issn.1000-7202.2012.05.18

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Army-civilian integration of military metrology is important content to equipment support in future. Requirement and content of army-civilian integration to equipment support are analyzed in this paper. This direction has great effect on system of metrology support to military equipment.