Table of Content

15 February 2016, Volume 36 Issue 1

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The Channel and Link Interference Simulation Technology of the Data Link Test Simulation and Evaluation

ZHU Jin；FANG Hong-zheng

2016, 36(1):  1-6.  doi:10.12060/j.issn.1000-7202.2016.01.01

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The channel and link interference simulation is one of the key technologies for the data link test simulation and evaluation system. In order to simulate the non-ideal character of the real operation wireless enviroment for the data link system in local area network, the channel condition and interference characteristic of the typical application enviroment needs to be analyzed and modelled, and the data link system performance under different enviromental conditons needs to be simulated and verified. This paper first analyzes the related principle and mechanism of the several kind of common channel and link interference simulation tools, then it sudies and proposes the methods and schemes of the transmission delay, channel and link interference and link-level simulation. Besides, several key problems are also anlyzed and the solutions are proposed. The validation effect of the proposed methods in the data link test simulation and evaluation system is good, which is able to provide the wireless channel and link interference simulation tools for the reliability and stability of the data link system, thus providing the reference and basis for the design of the data link system.

Research of External RF Immunity Test Technique for Military Vehicles

ZHANG Shi-wei；ZHAO Xiao-fan

2016, 36(1):  7-13.  doi:10.12060/j.issn.1000-7202.2016.01.02

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The aim of this paper is to put forward building method of external RF immunity test bench for military vehicles. Transmitter antennas selection, input power calculation and test system match are thereof discussed in detail. This paper also provides corresponding test method, and concludes its technical feature and innovation points. With this test bench and method, immunity specification is verified.

Research on Calibration Method of On-wafer Power

IU Chen；SUN Jing；LIANG Fa-guo；WU Ai-hua；ZHANG Li-fei

2016, 36(1):  14-17.  doi:10.12060/j.issn.1000-7202.2016.01.03

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For on-wafer power calibration, using a vector method to correct mismatch error introduced by microwave probe and power meter was proposed, and showed related formula. Then a method of extracting S parameters of a microwave probe was introduced, and compared the result with factory measurement data of the probe. Finally, the power measurement result using vector correction was compared with that of using scalar correction, showing that the at the frequency up to 40GHz, the accuracy of measurement result with vector correction is 0.4dB higher than without correction, and 0.1dB higher than scalar correction.

Design of Two-Way Satellite Time Transfer Modem Tracking Loop

WANG Xue-yun;WANG Hai-feng；ZHANG Sheng-kang；WANG Liang

2016, 36(1):  18-23.  doi:10.12060/j.issn.1000-7202.2016.01.04

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The tracking technology is the key of pseudo noise(PN) ranging system.Referring to the character of Two-Way Satellite Time Transfer modem,A tracking loop of demodulator has been researched. The tracking loop was designed and simulated Using Matlab software,and the tracking capability with different carrier to noise ratio and loop bandwidth was analyzed. Referring to the simulation results, The tracking loop was implemented based on DSP and FPGA, and the test results was obtained.The tracking loop has used in Two-Way Satellite Time Transfer modem,which is developed by our own and the uncertainty is within one nanosecond.

Design of a Wideband High Performance SMA Load

QU Xiao-song；CAI Xiao-tao；WANG Hui-feng；ZHANG Li-min

2016, 36(1):  24-28.  doi:10.12060/j.issn.1000-7202.2016.01.05

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This article presents the design and manufacture of a novel SMA wideband load with high performance, and then test it. The emphases of the wideband load design are the choice of the resistance, the match of transition segment, the design of the tractrix of the outer conductor of resistance segment. The structure is simulated using CST software. TDR (Time Domain Reflection) computation is well known from measurement. In simulation the TDR module is the only possibility to “look into a structure” and locate mismatches. It is very precision to design coaxial component. The final structure of this SMA load is fabricated and tested. The measured VSWR of the SMA load is less than 1.07. A good agreement between the simulated and measured results validates  the design.

Design of Recognition Ambiguous Path based on BeiDou Position

LI Chao；ZHU Ling-feng；YANG Yong；DENG Xiao-peng

2016, 36(1):  29-32.  doi:10.12060/j.issn.1000-7202.2016.01.06

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For the ambiguous paths of highway network, a highway pass card design based on BeiDou positioning technology is proposed. The highway pass card, which can record the precise position information of vehicles' movements, is realized through integrating BeiDou chip and Electronic Toll Collection (ETC) pass card. By matching the position record to map data, the actual vehicles' traveling tracks can be obtained, and then the highway tolls will be collected according to the traveling tracks. This design solves the ambiguous paths problem effectively, and can contribute to realize highway wide range network toll collection. Compared with the RFID technology and license plate recognition method, this solution has some advantages such as its precise recognition result, less modification to existing system and external influence etc, having the comprehensive value of application.

Simulation Design of Antivibration Crystal Oscillator

TANG Yuan-gui；HAN Yan-ju；PENG Hui-li；QIAO Zhi-feng

2016, 36(1):  33-37.  doi:10.12060/j.issn.1000-7202.2016.01.07

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An anti-vibration crystal oscillator design method using simulation software is introduced in this paper. The crystal oscillator mechanical properties were analysed deeply and in detail by establishing the simulation model for the crystal oscillator structure. On this basis, the influences of the damping material’s shear modulus and the vibration reduced object’s quality on the crystal oscillator anti-vibration performance were contrastively analyzed, and the crystal oscillator anti-vibration structure was optimized.The antivibration crystal oscillators were made according to the simulation design, and the random vibration tests were carried out. The results showed that the experiment phenomena were basically coincident with the simulation results, testifying the validity of the simulation analysis. The crystal oscillator phase noise under vibration reached -145dBc/Hz @1kHz to improve the crystal oscillator antivibration performance obviously.

The Influence of Spectrum of Discharging Hydrogen Atoms on the Magnitude of Oscillating Signal of Hydrogen Maser

MA Ni-na；LI Jing

2016, 36(1):  38-41.  doi:10.12060/j.issn.1000-7202.2016.01.08

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The spectrum of discharging hydrogen atoms of hydrogen maser is analyzed. The influence of the spectrum on the amplitude of oscillating signal is analyzed by experiments. The experiment result shows that when spectra intensity of discharge bulb reaches maximal value, turning the hydrogen flux at this point to about 3 times large, can make the oscillating signal stable at peak value. According to the results, the hydrogen flux is optimized to maintain the maximum of oscillating signal.

GNSS Multi-Frequency Correction Methods of Ionospheric Refraction Error

ZHAO Yan-zhen；SU Jian-feng

2016, 36(1):  42-46.  doi:10.12060/j.issn.1000-7202.2016.01.09

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Ionospheric refraction error is relatively large, single frequency refraction error of GPS(Global Positioning System)and BDS (BeiDou Navigation Satellite System) is analyzed. Then, different frequencies of GPS and BDS linear combination are researched in this paper. Three multi-frequency correction methods such as dual-frequency of one order, triple-frequency of one order and triple-frequency of two orders are discussed. Ionospheric delay correction will also enlarge the observation noises, so the observation noises of each correction method are analyzed and compared. Besides, a theoretical approach to select the best frequency combinations is proposed.

A Voltage Fluctuation Measurement System based on Digital Sampling

GUO Bei-chen；CHEN Shao-hua；YOU Li

2016, 36(1):  47-51.  doi:10.12060/j.issn.1000-7202.2016.01.10

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The paper describes a measurement procedure for voltage fluctuation. By comparing the existing voltage fluctuation signal detection methods analysising mathematical model, it poposes  a device based on Agilent 3458A digitizer used the root mean square value test. And sets up the voltage fluctuation signal measurement system, through the experiment, detects the voltage fluctuation frequency range covering 0.008Hz~40Hz, fluctuation range of 0.1%~30%.

Research on an Improved Conductive Plastic Potentiometer

GUO Wei-ni；LI Meng-xue；LI Dan-jia

2016, 36(1):  52-56.  doi:10.12060/j.issn.1000-7202.2016.01.11

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In order to meet the needs of electronmechanical servo actuators, a novel conductive plastic potentiometer with high reliability and better wear resistance is proposed. During long period of services, some insulating grinding grits will precipitate from the resistance body due to repeatedly friction with brush. Which bring an inherent defect for the existing conductive plastic potentiometer. That is, the occasionally data mutation of servo system, which greatly impact data interpretation. Nevertheless, the improved conductive plastic potentiometer proposed in this paper has optimized it’s structure and material, successfully overcome the defect and greatly extend longevity of the potentiometer. Therefore, the increasingly high requirements of electronmechanical servo actuators about reliability, wear resistance, longevity to potentiometer are well satisfied.

Design and Study of a Device to Measure Small Resistance

XU Chao；MA Chen；MENG Xiang-yu；JIANG Zhu

2016, 36(1):  57-61.  doi:10.12060/j.issn.1000-7202.2016.01.12

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A device used to measure small resistance is mainly described.The backgroud of the design is introduced, and then the design of the main function and the theory of the measurement circle are analyzed. The theory of the software and the function of the software running on the computer are explained, at last the test results are listed.From the test data, it can be concluded that the device designed to test small resistance fully meets the test demands, and it is so portable that it can be taken to the palce where it is needed.

Design of Multi-Channel Inductance to Digital Sensor

SI Kai-bo；HUANG Jian；LV Lin-tao

2016, 36(1):  62-68.  doi:10.12060/j.issn.1000-7202.2016.01.13

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Inductive sensing is a contactless, magnet-free sensing technology，it can precisely measure the position, motion, or composition of a metal or conductive target， also can detect the compression, extension, or twist of a spring. Now inductive measure method have limited in high power dissipation、lower accurate etc. In order to resolve this problem, A detection device was introduced, which based on two-channels inductance-to-digital converters LDC1612, used PCB coils as inductive sensor to detect metal, converted the sensor signals into digital signals, used an IIC interface connection to an ultra-low power MSP430F5529 in order to implement two-channels high-speed data transmission. The test results show that sub-micron resolution up to 28-bits in position-sensing applications, the device can be used in harsh environments, offered contactless sensing that is immune to nonconductive contaminants such as oil, water, dirt and dust, implemented two-channels contactless inductive sensor which has better performance, better reliability, greater flexibility, high performance and low power than existing sensing solutions.

Test Method for High Component of Coupling Frequency of DC Power Supply Output Voltage

YE Ling-ling；SUN Chao-bin；GUO Hai-sheng；ZHOU Dong-fang；LOU Yang

2016, 36(1):  69-73.  doi:10.12060/j.issn.1000-7202.2016.01.14

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Aiming at the measurement problem to high frequency AC voltage component of coupling frequency of DC power supply output voltage, which the component is the same frequency as the converter, in this paper the measurement method by using the digital oscilloscope is introduced, it focus on a variety of ways such as improving power supply quality of the measured power, making the oscilloprobe selection and connection, studying and analyzing the set method of the oscilloscope, etc. The problem of low frequency and noise disturbance in the measuring process is solved; the stable waveform of the high frequency component is obtained. The measurement with high repetition rate of the small signal of high frequency AC voltage is realized, and the measurement uncertainty is evaluated and analyzed in this paper.

Research on the Application of LabVIEW in the Lithium-ion Battery Testing System

FU Zhi-chao；YU Shui-ying；Dai Chang-lu

2016, 36(1):  74-78.  doi:10.12060/j.issn.1000-7202.2016.01.15

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In view of the requirement of lithium-ion battery testing system, the testing system developed by LabVIEW is designed. This paper introduce the composition and function of the lithium-ion battery testing system. LabVIEW call dynamic link library for CAN communication is described. The use of LabVIEW external interface ActiveX control to achieve database access, Word report generation, Excel spreadsheet export.