Table of Content

15 April 2014, Volume 34 Issue 2

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Dynamic Measurement and Evaluation Method of Contour for Object in High Temperature Environment

LIANG Ya-jun；SUN Zeng-yu；GAO Yue；CHEN Xiao-hui；WANG Dong-wei

2014, 34(2):  1-5.  doi:10.12060/j.issn.1000-7202.2014.02.01

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In order to measure the contour of object in high temperature environment, a new mea-suring and evaluation method based on binocular stereo vision is presented. The constitute method of optical characters and the image acquiring in high temperature environment, as well as the modeling and evaluation method is introduced. The measuring data of this method was compared with CMM. The result indicated that, the measuring error of this method is less than 0.5 mm, which satisfies the requirements of contour measuring in high temperature environment.

Research on Auto-collimation Measurement of Remote Dynamic Coincidence Degree Based on Quasi-Parallel Light

SHANG Qiu-fang；ZHANG Jun-jie；ZHAO Gong-wei；WANG Lei；WANG Qiang

2014, 34(2):  6-8.  doi:10.12060/j.issn.1000-7202.2014.02.02

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Aiming at the measurement requirements of wild, remote and dynamic coincidence degree, a sort of auto-collimation method based on quasi-parallel is proposed. Namely light-emitting and receiving are completed by a single instrument, the emanatory light is quasi-parallel light, glisten part is corner cube reflector, PSD or CCD converts the received light to electrical signals, and uses angles to express coincidence errors finally. Via static tests, it can be proved that the principle of the method is correct, the scheme is feasible, measure distances can reach up to km level, and the measurement results have a high accuracy. The method provides foundations for accurate tracking angles and development of special tracker.

Research on LVDT Displacement Sensor with Built-in Return Spring

LI Pei-jian；JIANG Xiao-tong；ZHENG Hao

2014, 34(2):  9-12.  doi:10.12060/j.issn.1000-7202.2014.02.03

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For mechanical feedback servo actuator to test the zero output is unstable, the errors are existed between the measured amount of displacement and the length of actual measurement. The original traditional LVDT displacement sensor can not meet the demanding for high-accuracy test. The joints gap is eliminated when using the new displacement sensor with builtin return spring and the test reliability is improved at the same time.

Analysis of Optimization of Sensor Stations in Intersection System for Large Scale Measurement

ZHOU Hu；SUN Yan-qiu；JIANG Xue-chao

2014, 34(2):  13-17.  doi:10.12060/j.issn.1000-7202.2014.02.04

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In order to improve the positioning precision of the target, an optimal disposition method for multiple sensors intersection system for large scale precision measurement is researched. Taking electronic theodolites as an example, a mathematical optimal disposition model for multiple sensors based on error separation is presented firstly, then the spatial constraints of the sensor disposition are analyzed with geometric approximation algorithm, the question of non-linear programming with inequality constraint conditions is solved by Guo algorithm and the best disposition of the sensors in permitted space is attained at last. The result indicates that the precision of the measurement is improved evidently and it can be use to provide guidance for disposition of multiple sensors in industrial field.

Research on Net RTK Technology Application of Dynamic Positioning in Region Among Islands

XU Yi-qun；WANG Jie-hua

2014, 34(2):  18-20.  doi:10.12060/j.issn.1000-7202.2014.02.05

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Based on engineering practice of high precision positioning guarantee at sea, the technology composing and application mode of long baseline net differential positioning technology application are described, the technical advantage and application future of high precision Realtime dynamic positioning technology at sea are exhibited, and the valuable experience in high precision positioning application at sea is provided.

Distortion Measurement of Satellite Antenna in Thermal Vacuum

HUANG Gui-ping；MA Kai-feng；WANG Cai-jian；QIN Gui-qin

2014, 34(2):  21-25.  doi:10.12060/j.issn.1000-7202.2014.02.06

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The techniques of digital close-range photogrammetry were successfully used in the high-low temperature deformation measurement of satellite antenna’s reflector in thermal vacuum, and problems of traditional measuring methods that can not be conducted in the vacuum environment were overcame. Excitingly, the measuring precision of the new method with two 8-megapixel digital cameras contained in custom-made pressurized canisters could reach 0.1mm, and could satisfy the designing requirements of products.

Research on S-curve Acceleration and Deceleration Control Algorithm of Speed Turntable

MAI Ji；ZHANG Xin-lei；LIU Jun-song

2014, 34(2):  26-29.  doi:10.12060/j.issn.1000-7202.2014.02.07

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Two kinds of acceleration and deceleration methods commonly are used for speed turntable.One is the straight line acceleration and deceleration method,the other is the exponential acceleration and deceleration method.Both of the two methods have mutations of acceleration,and there will be an impact for the test equipment. S-shaped curve acceleration and deceleration method for speed turntable is discussed in this article,which will ensure full performance of motor and can effectively reduce the mutations of acceleration,thus rapid and smooth operation can be achieved.In addifion, a control algorithm for computer is designed.

Development of Loading System on Thrust Autocalibration of Liquid Rocket Engine Test

ZHU Zi-huan；JIA Jie；GENG Wei-guo；GUAN Li；ZHOU Lei

2014, 34(2):  30-33.  doi:10.12060/j.issn.1000-7202.2014.02.08

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Thrust is the key parameter in liquid rocket engine, so thrust measurement is very important during the research test.Thrust calibration is an important link of thrust measurement,loading system is the basis of force value transferring.The composing and the work principle are described, the key technologies of system development are proposed and the technical way of conquer points is analyzed.The system′s loading capability is 0t～100t, the stability attains 0.001% by experiments, and the efficiency and accuracy of thrust calibration are improved.

Simulation and Analysis of Unmanned Helicopter Gyro Vibration

ZHU Wen-lai；GE Feng

2014, 34(2):  34-36.  doi:10.12060/j.issn.1000-7202.2014.02.09

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The structure and principle of the gyro vibration are described, by using the finite element method，the damping effect of unmanned helicopter gyro vibration is studied. By analyzing，the cantilever size of gyro damping structure is an important factor to affect the damping properties.That provides an effective analyzing method for subsequent mechanical structure vibration study.

Design of a Kind of Lowcost and Antiinterference Velocity meter

XIE Zhi-gang；ZHAO Jing-po；LI Jiang；YU Sheng-yi

2014, 34(2):  37-42.  doi:10.12060/j.issn.1000-7202.2014.02.10

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In order to decrease the cost of velocity meter, which is a part of a vehicle navigation system, a new kind of low-cost velocity meter is designed. This velocity meter includes a high-precision photoelectrical coder, and a corresponding phase demodulation circuit, it also has the characteristic of anti-interference. This meter had been experienced by several field-tests accompanying with the navigation system. The results show that this new velocity meter can meet specific requirements of the navigation system.

Design and Implementation of the Test Device for Cable Network

XU Chao；WU Dong-jian；JIANG Zhu

2014, 34(2):  43-46.  doi:10.12060/j.issn.1000-7202.2014.02.11

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With the development of the MCU technology ,and the more and more important function, the method to check the cable network absolutely based on manpower is not appropriate. A design of the test device for cable network based on MCU is introduced. Based on the detection principle, a design scheme is introduced. And the design of hardware circuit and hardware driver and application software are introduced in detail. Experimental results show that: the device fulfills the specification of the customs and inprove the effection.

Calibration of the  Metering Parameter for Transistors Burn-in Screen Machine

XUE Yan；LIU Yu-bo；DONG Fang；LI Gui-sen；LI Shao-hua

2014, 34(2):  47-49.  doi:10.12060/j.issn.1000-7202.2014.02.12

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The transistors burn-in screen machine is the colibration equipment in triode of superpower and low power(both NPN and PNP) ,diodes and so on. The influence quantities are putted such as voltage, current, on transistors and integrated circuit to check the reliability of transistor. The calibration methods of base voltage, collector voltage, collector current and the differences between the methods in one parameter are discussed.

Implementation of MBOC IF Modulation Signal Base on FPGA

YAN Wen-he；HE Zai-min；HU Yong-hui；ZHAO Kun-juan；LI Jin-lin

2014, 34(2):  50-54.  doi:10.12060/j.issn.1000-7202.2014.02.13

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MBOC modulation signal is adopted by Galileo and GPS system for interoperation. Based on studying the generating principle of MBOC(time division data modulation binary offset carrier)modulation signal, the characteristics of MBOC modulation signal are analyzed. The MBOC modulation based on Field-Programmable Gate Array (FPGA) is realized by Verilog. The result is provided by simulation and test, and it shows that the implementation scheme is feasible. It is of great significance for the research of the new structure of navigation signal and the development of new generation receiver.

Research on a Type of Region Ionosphere Correction Method of Sparse Distribution Station Conditions

ZHAO Kun-juan；HUA Yu；GUO Wei；YAN Bao-rong；YAN Wen-he

2014, 34(2):  55-60.  doi:10.12060/j.issn.1000-7202.2014.02.14

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The grid ionospheric correction method of WAAS satellite navigation system is studied, and the distribution characteristics of China′s regional ionospheric are analyzed. According to the China region sparse distribution station conditions, MEO and GEO satellites motion characteristics, as well as C-band GEO satellite ionospheric delay characteristics, the use of distance exponential weighting inter-polation ionospheric delay correction method is proposed. IGS published ionospheric data, respectively, using the grid ionospheric weighting method and distance exponential weighting interpolation method for Matlab simulation, then contrast with IGS afterwards sophisticated products on the simulation results, the results proof that the distance exponential weighting interpolation method for ionospheric delay correction has effect with a more ideal in the Chinese region sparse distribution station conditions.

Application of the Extended First-Order Difference Method in GPS Time Error

HU Chao；ZHAO Yong-gang

2014, 34(2):  61-63.  doi:10.12060/j.issn.1000-7202.2014.02.15

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By introducing and analyzing the principle about Global positioning system(GPS) time measured ,time error measured and time error eliminated by difference method, the idea which lessens time error and improves time precision is proposed by applying to two GPS receivers in TT&C station. Based on the above idea, the extended first-order difference model is put forward. By using this method, accurate GPS time for TT&C system can be calculated and the time difference of any two TT&C subsystems in station can be synchronized.

Research on GPS Signal Acquisition Algorithm in High Dynamic environment

CHEN Dan；KE Xi-zheng；HE zhen-quan

2014, 34(2):  64-69.  doi:10.12060/j.issn.1000-7202.2014.02.16

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Signal capture in dynamic environment is the key technology of the Global Positioning System(GPS) receiver. The phase delay of GPS signal and doppler frequency shift are produced by the receiver within a state of high speed movement, and the signal capture difficulty is increased. Two algorithms including FFT capturing and sliding relative to capture are analyzed. The FPGA implementation architecture based on FFT capturing algorithm is given，and the GPS signal simulator is adopted to verify the feasibility of the design which can capture signal. The results show that capture based on FFT algorithm can realize reliable signal capture in the navigation astrology for carrier rate of 1000m/s and acceleration of 5g cases.

Design of the Automatic Calibration System for Isolated Analog Signal Conditioning Modules

YAN Hong-yan；WU Hua

2014, 34(2):  70-74.  doi:10.12060/j.issn.1000-7202.2014.02.17

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According to the fact that the isolated analog signal conditioning modules has problems like type redundancy, multiplex parameters, heavy utilizing rate and manual evaluation is timeconsuming, laborious, inefficient and fallible, based on the VEE Pro softwareexploiting platform, the system of automatic calibration of isolated analog signal conditioning module is developed. The system contains three main moulds: instrumental information recording, calibrating and printing. The test data can be displayed in real time, and the data can be processed and archived automatically. The results show that the system is easy to operate. It improves working efficiency, reduces manmade errors and ensures the veracity of the test data.

Evaluation of Infrared Detector Equipment Index Based on BP Network

WANG Ai-liang；WANG Ai-li；ZHENG Yu-hang

2014, 34(2):  75-77.  doi:10.12060/j.issn.1000-7202.2014.02.18

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Infrared detector equipment is an important part of infrared system, and to evaluate its performance has a practical significance. The main impact factor is analyzed, and environment temperature, relative humidity, visibility, radiant flux, target height and detection range are selected for evaluation index. In view of the nonlinear mapping function of neural network is good and the characteristics of high precision,the BP network evaluation model is set up, the experiment expresses that the method is simple and effective, evaluation precision is high, and has more actual application value.

An Evaluation Algorithm for Image Sharpness Based on Energy-Grayscale Distribution

LI Miao

2014, 34(2):  78-82.  doi:10.12060/j.issn.1000-7202.2014.02.19

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An image sharpness evaluation algorithm is proposed to evaluate the quality of image which has been optical filtered. The theory and process of this algorithm are analyzed, which attaches importance more on the influence of light intensity on the quality of image than other previous algorithms. Compared with other image sharpness evaluation algorithms, the experimental results show that this method overcomes the disadvantages of gradient square function, and would be effective in the evaluation not only in the automatic focusing field but the general images.

Research on Related to Tracking Ship Electro-Static Discharge

YANG Yang；CHEN Wei；LU Ying；LIU Jia-jia

2014, 34(2):  83-86.  doi:10.12060/j.issn.1000-7202.2014.02.20

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The electrostatic generation way is analyzed, aiming at the electrostatic hazards existed in the tracking ship.  The modification of the tracking ship electrostatic protection is researched according to electrostatic protection principle of suppress the accumulation of static electricity, building electrostatic discharge channels, and standardizing operation behavior. The effective electrostatic prevention measures are proposed in the aspects such as personnel, equipment, earthing system and environment.