Table of Content

15 April 2015, Volume 35 Issue 2

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Development of Three Redundant Angular Displacement Sensor with Subminiature and High-reliability

LI Dan-jia；CHEN Di；GUO Wei-ni；YANG Ming

2015, 35(2):  1-5.  doi:10.12060/j.issn.1000-7202.2015.02.01

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In order to meet the high reliability requirements of the new model to launch vehicle, the angular displacement sensor is designed by using series, in parallel with three redundancy in a closed-loop used as measurement and feedback. For servo output shaft angle measurement, the mechanical angular signal is converted to electrical signal output to the controller, so as to realize electric servo closed-loop control. Three ultra-small, high-reliability redundant angular displacement sensor is in the form of three redundant rotary potentiometer, but with two-ring design, one of the rings as the single way,another ring for doubleredundant design, the resistance ring will be overlapped , the structure is the combination of the series and parallel, can  be used alone or in parallel electrically. This sensor using new brush structure, improving the environmental adaptability of the product, has significant social, economic benefits and promotional value.

Study of a New Type of Redundancy Binocular PNP Photogrammetric Positioning Method

SHA Chun-zhe；WANG Kai-lei；WANG Chun-xi；ZHOU Jun；CUI Gui-li；WANG Zhan-tao；LIU Sha

2015, 35(2):  6-9.  doi:10.12060/j.issn.1000-7202.2015.02.02

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A new type of redundancy binocular PNP camera positioning method has been introduced. The absolute position of the object in three-dimensional can be calculated through the coordinate transformation, by establishing the relationship between image coordinate system, the camera coordinate system and the world coordinate system. The positioning method has characters of high precision, good reliability to compared with monocular camera measurement methods, and can be widely applied to many fields.

Calibration Method for Separate Azimuth Vertical Transmission Device

WU Yan-jun；ZHANG Zhong-wu；ZHANG Jun-jie；LI Yong-gang

2015, 35(2):  10-13.  doi:10.12060/j.issn.1000-7202.2015.02.03

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Aiming at  the technical features of separate azimuth vertical transmission device, a new calibration method with high accuracy for different transmission distances is proposed. The measuring and calibration of azimuth vertical transmission are achieved in different transmission distances without mechanical connection in horizontal state by using pentprism, silicon plate and autocollimation theodolite. The error analysis and experimental verification of the calibration system are carried out. A theoretical basis is provided for the promotion and application of azimuth vertical transmission device.

Measurement Method for Angle Acceleration of Turn-table Based on Accelerometer

GAO Yang；ZHANG Xin-lei；MAI Gi；HU Rui

2015, 35(2):  14-16.  doi:10.12060/j.issn.1000-7202.2015.02.04

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The angle acceleration is an important technical indexes for dynamic performance of turn-table. Based on the calibration method of  Accelerometer, the feasibility using accelerometer to measure angle acceleration is analyzed, and the method is put to come true. The measurement requirements of acceleration for turn-table in particular condition are solved.

Design of a High-precision Test System of the Attitude Angle Convertor Based on the PXI Bus

CHEN Di；LI Dan-jia；ZHU Ting-wei；YANG Ming；GAN Lin

2015, 35(2):  17-21.  doi:10.12060/j.issn.1000-7202.2015.02.05

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In order to verify the function reliability of the attitude angle convertor of the telemetry system, a high-precision test system based on PXI bus is designed. It is designed as modular design platform based on PXI bus, including different function module plug-in printed circuit board to enhance the expansibility of the hardware construction. The high-precision test system is an integration system design imbedding the display device. The software design, based on the LabWindows/CVI which is the specific program development software of the test system, is coding by C language. In order to fully utilize system resource, the multithread programming technique of which the run and stop is controlled by the software timer to real time refreshes the display data. The feasibility of the test system is well proven by the real time test data.

Analysis of Effect by Thermoelectric Potential in RTD Temperature Measurement System

HUANG Ze；CUI Wen-de；AHAO Hua-ye

2015, 35(2):  22-26.  doi:10.12060/j.issn.1000-7202.2015.02.06

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The fixed constant excitation current direction is widely used in RTD temperature measurement system. Usually the temperature is measured by measuring the resistance of RTD which is gauged from potential difference. The system is always affected by the thermoelectric potential. The measured resistance of RTD is different from the actual data, which will affect the temperature measurement results. The mechanism of thermoelectric potential which impacts on the results of the temperature measurement in the circuit is analyzed and the analytical results are verified by experiment. The recommendation and guidance of reducing or eliminating the impact of the thermoelectric potential difference on the results of temperature measurement are proposed.

Measurement of Gas Vane Ablation Rate Based on the 3D Technology

KONG Fan-jie；WANG Duan-zhi；FENG Wei-li

2015, 35(2):  27-29.  doi:10.12060/j.issn.1000-7202.2015.02.07

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A new measurement method based on the 3D scanning technology is founded to measure gas vane ablation rate accurately, which has unacceptable deviations using the current method. The new method can improve the measurement accuracy of gas vane ablation rate. It provides the basis for precision-desigh in the future models.

A method of Temperature Separation Measurement with Linear Optocouplers

WU Dong-jian；JIANG Zhu；WU Yong-hong；XU Chao

2015, 35(2):  30-32.  doi:10.12060/j.issn.1000-7202.2015.02.08

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The method of temperature separation measurement with linear optocouplers is introduced, the measurement effect is very well. In the process of the temperature measurement the separation of the power supply, input signal and output signal is carried out.

Research on the Centroid Standard

WANG Xiao-san；YAN Lei；SUN Feng-ju

2015, 35(2):  33-37.  doi:10.12060/j.issn.1000-7202.2015.02.09

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A rigid body, with regular figure, was usually used as the centroid standard in the application of centriod measurement and calibration. But recent researches on the centroid standard found that the value of a rigid body′s centroid is often uncertain, which means expecting value of centroid is unequal to real value because of some reasons and might cause serious errors in the centroid measurement. So a new centroid standard without regular figure was developed to calibrate the special equipment. According to comparing results, it′s clear that the new standard′s centroid outgoes the regular figure′s one.

A Research on the Technology for Valve Fault Diagnosis of the Integral Natural Gas Compressor

ZHOU Zheng-yi；GU Ya-xiong；YANG Zhong-qiang；TIAN Bao；TANG Qi-dong

2015, 35(2):  38-42.  doi:10.12060/j.issn.1000-7202.2015.02.10

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The integral natural gas compressor is widely used in the petrochemical industry, the normal operation of the compressor has an important effect on safety production. In order to improve the integral compressor valve fault diagnosis problem, on the basis of decomposition and reconstruction principle of Daubechies wavelet function of ZTY470 type integral type natural gas compressor vibration signals, introduces the fault diagnosis process to the energy of vibration signal as fault feature. The fault vibration signal of gas valve and spring fracture is analyzed with wavelet packets, and compared with the signal during the normal operation. Experiments show that this method can accurately carry out fault diagnosis and fault location, proved the validity of integral type natural gas compressor valve fault diagnosis.

Investigation on Technology of Doublepulse Transient Speckle Vibration Measurement

WEN Ju-ying；ZHANG Da-zhi；CHEN Lin；SHI Wei-ke

2015, 35(2):  43-48.  doi:10.12060/j.issn.1000-7202.2015.02.11

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Aiming at the impact of digital speckle pattern interferometry on the transient vibration measurements, the technology on double digital speckle pattern interferometry was conducted. Uniform distribution of laser beam energy by space filter is achieved, and double-pulse laser and high-speed camera work synchronously by controlling time accurately. The transient speckle interference pattern is acquired with the proposed method. The research seeks to investigate and provides transient vibration measurements with double-pulse interval from 2μs to 800μs.

Integrated Automatic Testing Platform in Spacecraft TT&C Based on CPCI

LI Jin-long；LIU Jian-tuo；CHEN Shan-zhi；ZENG Xing-xing

2015, 35(2):  49-52.  doi:10.12060/j.issn.1000-7202.2015.02.12

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The test demand of spacecraft TT&C has been analysed. An integrated automatic test objective has been proposed and the test solution based on CPCI has been designed. Test requirement in different flows can be satisfied. Measurement process and schedule of software can be configured. The number of devices and R&D cost have been reduced,and also the measurement efficiency has been improved greatly.Different project test demand,the inherition and reusage demand can be satisfy by the generalization design. At last, the development and application of automatic testing in TT&C have been prospected.

Babin Model of Evaporation Waveguide Diagnosis and Its Sensitivity Analysis

YU Gui-shui；LIU Ai-guo；YANG Yun-sheng

2015, 35(2):  53-56.  doi:10.12060/j.issn.1000-7202.2015.02.13

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Babin model is an advanced method of evaporation waveguide diagnosis, to improve the effect of this model, the formulas is deduced , and the sensitivity of its inputting parameters is analysed with the method of simulation, the research shows that the relative humidity is the most sensitive parameter in condition of unstable atmospheric layer, and surface temperature is the most sensitive parameter in condition of stable and neutral atmospheric layer, and the turbulence of air pressure is almost no effect on the calculation result. High precision sensors of relative humidity and surface temperature should be selected when evaporation vaveguide is diagnosed from the parameters measured above the surface.

Analysis of Work Ability Airborne Radar Measuring and Control Station

CONG Lin；MENG Fan-cheng

2015, 35(2):  57-60.  doi:10.12060/j.issn.1000-7202.2015.02.14

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Ground-based and ocean-based measuring and control equipment to track low-altitude targets, especially hedgehop is affected by the stadia, working distance is limited, but airborne measuring and control station for air measuring platform isn′t affected by the stadia, the article introduces the compose, function and working elements of the airborne measuring and control station, analyses relatable parameter connection and working ability of the airborne measuring and control station, puts forward the measures for improving the capability of tracking method, offers the system tracking distance calculation formula, analyses the tracking ability of the system by several typical target speed, and compares the tracking ability with ground-based and ocean-based measuring and control equipment.The result indicates, the working distance of the airborne measuring and control station is farther for tracking low-altitude targets, has the more application space in the low trajectory and far gunshot target flying test.

Research on Radar Target Characteristics of Unmanned Helicopter

JIANG Zhi-hua

2015, 35(2):  61-66.  doi:10.12060/j.issn.1000-7202.2015.02.15

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Radar scattering characteristics of target is an important performance index of unmanned helicopter. With a certain type of helicopter geometric parameters as an example, analyzes the characteristics of unmanned helicopter RCS, establishes the geometric model and computes the fuselage and rotor electromagnetic grid based on CAD software and rotor electromagnetic grid method. Through making calculation and analysis process, analyzes unmanned helicopter RCS performance index and obtains the RCS analysis results of unmanned helicopter.

Design and Implementation of Test Software for IQ Orthogonality of Navigation Signal

CUI Xiao-zhun；ZHENG Yu-hong；FU Lin-chun；NIE Xin1；LI Yi

2015, 35(2):  67-71.  doi:10.12060/j.issn.1000-7202.2015.02.16

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As the general commercial instruments cannot satisfy the testing requirements for IQ orthogonality testing of modern navigation signal, a testing software for IQ orthogonality has been developed based on Matlab GUI. The software controls high-speed digital oscilloscope via the network interface and samples the PPS (Pulse Per second)and navigation signals of navigation signals source respectively in dual-channel. The navigation signal data is extracted according to the starting point of the navigation signal determined by the PPS. After digital waveform-matching of navigation signal has been done with the local pseudo-random code modulation wave, the carrier initial phase of I and Q branch can be precisely estimated, then the test result of IQ orthogonality is obtained. The software has characteristics of friendly interface, easy operation, intuitive display. The simulation results show that random error of the test result is less than 0.5 degrees in the case of typical carrier to noise ratio.

Design and Realization of UAV  Data Communication System

FU Li；ZHAO Min

2015, 35(2):  72-75.  doi:10.12060/j.issn.1000-7202.2015.02.17

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UAV data communication system is designed to control the UAV flight and the payloads. The basic working theory and main function structure of the system are introduced. Design principle based on basic function unit is presented to reach a modular and combinable system after detailed analysis of data communication system′s function and features. Flight tests show that the design meets the system specification and fulfils the data communication system function and feature requirements.

Measuring Solution & Realization of Soldering-type Coaxial Radio-frequency Cable Delay Line

BAO Xing-sheng

2015, 35(2):  76-79.  doi:10.12060/j.issn.1000-7202.2015.02.18

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Soldering-type coaxial radio-frequency cable delay lines, without coaxial radio-frequency connectors, are directly soldered to the equipments. In the production of these delay lines, it is very difficult to measure all electronic parameters exactly, especially phase. According to the delay line′s electronic features, the measuring system was analyzed on the basis of vector network analyzer, the measuring solution brought forth, and the design of two critical connecting devices is carried out, which includes structural design, electronic features design, delay compensation, phase compensation, and samplemaking. With the verification of production practice, this measuring solution is reliable, efficient and economical.

A Design of Unit for Engendering Obstruct Signal

CHEN Jian-tao；GUO Ting-meng

2015, 35(2):  80-82.  doi:10.12060/j.issn.1000-7202.2015.02.19

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Radar jamming system is an important combat equipment under complex electromagnetic environment.According to the difference of radar signal,jamming signal generation unit can generate the interference signal.The structure of jamming signal generation unit is expounded,and the design of frequency synthesis、variety frequency and DRFM synthesis has been realized.The key technology——the composite of direct digital frequency and aim frenqucy noise engendering unit have also been solved. The testing outcome shows that the jamming signal generation unit can satisfy the target demands of the system.

Research on Fault Diagnosis and Control Technology of Unbalanced Rotor Based on Wavelet Analysis

LI Chun-fang；HUANG Jian-min

2015, 35(2):  83-86.  doi:10.12060/j.issn.1000-7202.2015.02.20

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Based on the unbalance mechanism analysis of engine′s flexible rotor, the signal could be extracted and identified by using wavelet decomposition and reconstruction method. And the fault diagnosis for the rotor unbalance is accurate, also the balance problem of the flexible rotor can be solved by using modal equilibrium method.Test results show that the rotor unbalance fault can be reduced effectively and the wavelet analysis is very effective for Fault diagnosis of unbalanced rotor.