Table of Content

15 December 2012, Volume 32 Issue 6

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Application of Ring Laser in Angule Measurement

ZHOU Cai-hong;YUN Peng;LIANG Ya-jun;LIU Ke

2012, 32(6):  1-3.  doi:10.12060/j.issn.1000-7202.2012.06.01

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The laser with a ring cavity (ring laser) is suggested.The principle of RL measurement is the effects of Sagnac, For this serval advantages are given to RL. Working principal,the sustainable development,possible applications are intruduced . It is used as a sensor such as ring laser gyro (RLG) in inertial navigation system. It is also used to make a dynamic goniometer for different applications of precision angle measurement. A study direction of the Application is found.

Measurement of Straightness Motion Error for CMM Based on Sequential Two Points Method

YANG Bei;HE Wei-ming

2012, 32(6):  4-8.  doi:10.12060/j.issn.1000-7202.2012.06.02

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The feasibility of measurement of straightness motion error for CMM based on Sequential Two Points Method was researched, the principle of measurement of Sequential Two Points Method was introduced and errors from the misalignment and adjustment sensors were analyzed quantificationally. According to the straightness motion error for existing CMM, the results indicated that the method of Sequential Two Points to measure straightness motion error，which can content with the requirements of the measurement accaracy，is practical and reliable.

Research On Package Physics of Rubidium Frequency Standard with Low Temperature Sensitivity

TU Jian-hui;ZHANG Jin-hai;CHEN Rong-bo;CUI Jing-zhong

2012, 32(6):  9-12.  doi:10.12060/j.issn.1000-7202.2012.06.03

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The physics package is the core of atomic frequency standard, and temperature sensitivity is the most signification limitation to improve the frequency stability of rubidium frequency standard(RFS). In this paper, researched on the basis of analysis of the affection of temperature fluctuation to the frequency stability of RFS, a kind of physics package was designed and its physical properties were studied to validate the reduction of its temperature sensitivity.

Improving the Modal Measure Accuracy by the Laser Vibration Technique

CAI Shao-jia;WANG Fei

2012, 32(6):  13-16.  doi:10.12060/j.issn.1000-7202.2012.06.04

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The vibration of a beam is studied. A scanning laser vibrometer system is used to measure the natural frequency and modal of transverse and longitudinal vibration. The experimental results is well consistent with the theoretical modal analysis results. Compared with the results obtained from traditional transducer measurement, it shows that the measure accuracy can be improved by the laser Doppler technique and the problem of append mass and rigidness to the structure caused from transducer measurement can be solved. The technique is well used especially in the modal measurement of light and thin structure.

Modal Analysis of Truss Structure Based on Ansys

ZHANG Jun-xiu;LIU Jun-song;JIANG Wen;LIU Peng;CAO Yu-mei

2012, 32(6):  17-20.  doi:10.12060/j.issn.1000-7202.2012.06.05

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Modal analysis is the foundation of dynamic analysis. The finite element method is analyzed by using ANSYS software taking truss structure as a example. It would provide modal parameter like natural frequency, and we can get a better design according to the parameter, like  enhancing the rigidity of truss structure and improve the natural frequency to avoid resonating.

Studied Practices of Helium Mass Spectrometer to Leaking Detection Technology

PU Rong-qiang1;HUANG Wen-ping2

2012, 32(6):  21-24.  doi:10.12060/j.issn.1000-7202.2012.06.06

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Introducing the theoretical  basis of helium mass spectrometer to leaking detection technology,the automatic control technology is used here , which improves intelligent level and reduces the range switching time and expands the measuring range with the helps of  both  180° non-uniform magnetic field for ion focus and electronic range switching . The paper gives the studied practices to high precision sealed intelligent detection system in detail.

Research and Development of the Mass Comparator with 5t Capacity

WANG Xiao-san;Mei Hong-wei;Li Ting-yuan

2012, 32(6):  25-29.  doi:10.12060/j.issn.1000-7202.2012.06.07

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The first mass comparator with 5t capacity in our nation is introduced, which can be used to verify the weights of class M₁.The validity of the mass comparator is affirmed according to describing the main ways and means, hard points conquered, and the result of measurement. It is useful to make the capacity be bigger for mass comparator.

Flight Safety Control and Safety Controller Design of the UAV

XUE Yan-feng;XIAO Qian-gui;CONG Shu-quan

2012, 32(6):  30-34.  doi:10.12060/j.issn.1000-7202.2012.06.08

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On solving the problem of the flight safety of the UAV, techniques, methods and measures of improving the mission flight safety of the UAV are introduced, a design route of the UAV safety controller which is independent of the flight control system of the UAV is proposed, and based on GPS. Through researching of safety control tactics, a safety controller is designed. The simulation experiment of the controller is made to a UAV. The results are given and prove that the safety controller is effective.

Simulation of Tuning Procedure for Microwave Cavity in the Compact Cesium Atom Clock

HUANG Liang-yu;WANG Ji;CHEN Jiang;ZHANG Di-xin;MA Yin-guang

2012, 32(6):  35-37.  doi:10.12060/j.issn.1000-7202.2012.06.09

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By building the microwave cavity model, the tuning procedure for microwave cavity in the compact cesium atom clock was simulated by using Ansoft HFSS 12.0. There was the curve relationship between cavity resonance frequency and the length in the tuner microwave of the rod tuner. The result shows that, with increasing the length of rod tuner in the tuner microwave, the cavity resonance frequency is decreased, when the radius of rod tuner is a constant, and the length of rod tuner is changed within a certain range. With increasing the radius of rod tuner, the range of cavity resonance frequency is increasing, meanwhile the influence of length on the cavity resonance frequency is increasing at the transition frequency of cesium atom. We suggest the optimal radius of rod tuner on the basis of the result in order to provide the basis for the structure and principle analysis of cavity in compact cesium atom clock and theoretical guidance for the cavity design and manufacture.

Regulation the Analog Signals with the Linear Photo-electric Isolate Amplification Technology

WU Yong-hong;JIANG Peng-cheng;WU Dong-jian1;Ma Chen;MONG Xiang-yu

2012, 32(6):  38-42.  doi:10.12060/j.issn.1000-7202.2012.06.10

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In detectins the vehicle classis system, how to amplify and isolate the vehicle-mounted signals in the complex electromagetic environment is the problem which the ergineers must pay great attention to and urgently needed to solve.To counter the demand of analog input of the Field sensor to scaling up, the multiple solutions are Compared and further discussed by the researchers. Based on the analysis of photo-coupler character, the design project is determined to use Nonlinear sensor photo-coupler of the consistent parameters and circuit feedback compensation. The scheme is simple and practical, cost-effechive, good linearity, strons anti-in terference capability,and has god engineering application value.

Influence of Reversal of the Information Bit on the Impact of Carrier Frequency Estimate During the Acquisition of Spread Spectrum Signal

SHANG Xiang-yong;YANG Jun;CHEN Li;QU Zhi

2012, 32(6):  43-46.  doi:10.12060/j.issn.1000-7202.2012.06.11

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During the acquisition of spread spectrum signal, integration gain would be reduced and estimate of the carrier frequency would be mistaken, if reversal of information bit was met. As a result, probability of acquisition will fall and longer time will be taken. Error in the carrier frequency estimate is analyzed, on the assumption that the local code phase is right. It is shown that the error lies in inverse proportion to the integration time T, when the position of the reversal is acknowledged. In the worst case, it can reach 0.75/T Hz, and the tracking loop can not begin to work. In the end, an easy way to solve this problem is brought forward.

Design of  LCD dynamic Display System based on the Freescale MCU

YU Hong-ying;YANG Jie;FENG You-hong

2012, 32(6):  47-51.  doi:10.12060/j.issn.1000-7202.2012.06.12

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A kind of resistance testing of dynamic display system is introduced. The control chip of this system is Freescale MC9S12XS128 microprocessor，and it’s monitor is used by backlight 12864-LCD display containing Chinese character library . The system software environment is Freescale CodeWarrior. It has realized the measured resistance value of dynamic real time graphical display by the associated display functions for 12864-LCD.The testing for the graphic display shows that the system is stable and reliable with superior performance and certain universality.

Research of the Narrowband Interference Suppression algorithm for DSSS systems based on FFT

LIN Ming;HU Zhu-li;YANG Jian-wei

2012, 32(6):  52-56.  doi:10.12060/j.issn.1000-7202.2012.06.13

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To overcome the narrowband interference (NBI) in the direct sequence spread spectrum (DSSS) system, an antijam algorithm based on Fast Fourier Transform (FFT) is introduced. The narrowband interference is detected and suppressed by FFT based on its power distribution different from the DSSS signal in frequency domain. And the synthesizable algorithm is implemented by Verilog HDL to achieve in the FPGA. Simulation and hardware test show that anti-jam block can suppress NBI and get back the original signal.

Design and Implementation of Calibration Software of Fractional Code Delay for RNSS Signal Transmitting Channel on Navigation Satellite

CUI Xiao-zhun;LIU Qing-jun;LI Yi

2012, 32(6):  57-62.  doi:10.12060/j.issn.1000-7202.2012.06.14

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A design and implementation of automatic calibration software of fraction code delay for RNSS （Radio Navigation Satellite Server） signal transmitting channel for navigation satellite based on Matlab GUI is presented. The software controls a high sampling rate digital oscilloscope through GPIB interface. The Navigation satellite BPSK transmission signal and pules per second signal are sampled. With a digital signal processing algorithm, the phase transform point corresponding to chip level changement is determined, then fraction chip delay is obtained. The interface of software is friendly. The operation of software is easy and the display of the processing result is visual. The software has been applied to the integration test of navigation satellite.

Design of Interchangeable Automatic Control Driver Based on the LabView Platform

SONG Shu-juan;DONG Chun;LIU Bi-ye

2012, 32(6):  63-66.  doi:10.12060/j.issn.1000-7202.2012.06.15

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A kind of driver is designed based on the LabView platform. The interchangeability of similar-type instrument drivers of different models is achieve.The problem that traditionally one driver can only control one certain model instrument is solved. And the driver is verified that it is of great value by application.

Study of Test Method for Solar Array Simulator Power Sapply

SUN Yi;LUO Zhen

2012, 32(6):  67-71.  doi:10.12060/j.issn.1000-7202.2012.06.16

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The principle of Solar array simulator power supply (SAS), the differences and relations between Verification Regulation and SAS testing, and recommended test items and method are introduced. SAS is a core equipment for power supply subsystem of spacecraft ground testing. Its technical performance will directly affect the quality of spacecraft ground testing, thereby affect the reliability of spacecraft.

Research of Test Method the Conductive Slip Ring

WANG Yang;CHEN Yan-ling;YU Zhi-hong;WANG Xiao-ming

2012, 32(6):  72-76.  doi:10.12060/j.issn.1000-7202.2012.06.17

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The test items of the conductive slip ring, including insulation resistance, contact resistance, contact resistance variation, current carrying capacity, value of isolation, electromagnetic noise and transmission capability are formulated, and a detailed test method is made out for every test item, which establishes very good foundation for the effective measurement.

Research on Reliability-estimating Method for the UAV

LU Xiao-lin;ZHU Wen-lai

2012, 32(6):  77-79.  doi:10.12060/j.issn.1000-7202.2012.06.18

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Based on the reliability statistic character of UAV , the method of estimating the reliability of the binomial distribution system and the exponential distribution unit is analyzed, and is successfully applied in reliability tests of a UAV. It has a salutary experience for other equipments to test reliability.

Design of Automatic Evaluation of Measurement Uncertainty for Indication Error of the Digital Multimeter

YAN Hong-yan;WU Hua

2012, 32(6):  80-87.  doi:10.12060/j.issn.1000-7202.2012.06.19

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According to the fact that the digital multimeter was detected have problems like various types, multipex calibration items and after the calibration, the uncertainty of the evaluation results should be given within the whole test range. Manual uncertainty evaluation was proved to be time-consuming, laborious, inefficient and prone to errors. Based on the VEE Pro software-exploiting platform, the system of automatic evaluation of uncertainty of measurement result of indication error of digital multimeter was developed. The system contains two moulds, the evaluation of uncertainty of digital multimeter with interface and the evaluation of uncertainty of digital multimeter without interface. Besides, the system could be automatically evaluated and saved the uncertainty data. And the uncertainty evaluation results of the indication error of dc voltage with examples could be showed up. The results show that the system is easy to operate; it can improve the working efficiency, reduce the man-made error and ensure the accuracy of test data.

Research of Eliminating Abnormal Datas in Multi-Source Fusion Based on Multi-Wavelet Basis

ZHUO Ning

2012, 32(6):  86-89.  doi:10.12060/j.issn.1000-7202.2012.06.20

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The method of eliminating abnormal datas in multi-source fusion based on multi-wavelet basis and skewness analysis is presented.First,The multi-wavelet basis and scale wavelet decomposition to the sensor signals is carring out. Then, the weighted dada fusion algorithm is implemented to signals of the same waveletbasis decomposition on multi-scale.Last,the signal is reconstructed by inverse transformation of different waveletbasis. The final fusion is the estimate of target state,moreover by combining skewness analysis and threshold detection,we can detect and eliminate abnormal datas．Experimental shows that abnormal datas can be detected and eliminated efficiently and quickly by this method,then data processing precision can be risen,it is also easy to realize in project.