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Table of Content

15 June 2013 Volume 26 Issue 6
  
    Articles
    Research on and Design of Packet Switching Technology in the Optical Transmission Network
    ZHU Qian,JIANG Lin,CAI Long
    . 2013, 26(6):  1. 
    Abstract ( 1051 )   PDF (680KB) ( 984 )  
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    In view of the limited capacity and rate of OTN signal transferring in circuit switching,the paper researches the advantages of optical transport network based on the packet structure and puts forward a solution.This article first introduces the basic structure of the packet switching network combination with the optical transmission network and the OTN frame structure and hybrid network standard package format,and then describes a realizable structure which integrates the OTN technology and packet technology.This structure can de-multiplex optical channel data unit to the lower order form,and then cut them into discrete packets.These packets can be sent to packet switching chip via standard package interface,after which the packets flow to reassemble module where they can be reassembled into continuous data streams.The data streams are multiplexed to higher optical channel data unit form and sent out in multiplex module.

    Computer Monitoring Software Design of Sterling Solar Power Controller
    GU Honggang,ZHOU Hanyi,REN Jinpeng,RUAN Qingliang
    . 2013, 26(6):  4. 
    Abstract ( 1131 )   PDF (584KB) ( 860 )  
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    This paper introduces the Stirling solar power generation master controller PC software design idea and presents relevant field experiment data analysis.This design mainly uses the Delphi platform,with CAN as the main communication so as to realize the monitoring parameters,data collection,storage database,manual operation and automatic operation of the main function.The design realizes the remote transmission,monitoring real time data,operation master and tracking system,and has the advantages of low cost,reliable real time data,simple operation,and stability.

    Design of an Infrared Guidance Control Information Processing System Based on DSP and FPGA
    SUN Aizhong,ZHANG Wanzhen,LIU Bing,TAN Zhen
    . 2013, 26(6):  7. 
    Abstract ( 1198 )   PDF (615KB) ( 949 )  
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    Based on an analysis of the infrared guidance control information data processing system function,a design of system based on DSP(TMS320C6414)and FPGA(XC2V2000-FG676) is put forward,an the working principle,hardware and software of the design and its realization are presented.DSP is used for the signal collection and procession of the image processing unit.The host control electric circuit function parties realized by FPGA logic design.This design has great value and wide applications in the future in IR imaging tracking systems.

    Design of a Solar Tracking Control System Based on ARM
    LIU Lulu,HUANG Xiangkang,QIU Xuanbing,WEI Jilin
    . 2013, 26(6):  10. 
    Abstract ( 1048 )   PDF (776KB) ( 844 )  
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    To improve the generating efficiency of tracking concentrating photovoltaic system,a sun tracking control system is designed based on ARM.The system tracks the sun by the method combining the sun tracking movement and four-quadrant sensor.The control system acquires the light intensity of an independent light intensity sensor to decide whether or not to start the tracking system (e.g.cloudy or rainy day).The mechanical structure of the tracking control system,hardware circuit design and software design are elaborated.Experiment indicates that this tracking control system has the advantages of low-power,reliable performance,and high tracking accuracy within ±1.5°.It can realize high precision tracking of the sun and satisfy the requirement of concentrate photovoltaic generating control system.

    Auto-focusing Methods for Airborne Electro-optical Imaging Devices
    SHAO Mingli
    . 2013, 26(6):  14. 
    Abstract ( 1126 )   PDF (593KB) ( 915 )  
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    Auto-focus technology is a way to enhance the measurement accuracy.The article describes the application of automatic focusing method based on image processing in airborne electro-optical imaging device.The two focusing evaluation operators of Mix and Bevel are proposed.Three focus control strategies are employed,namely the local global search method,AC variable-length climbing search method and a combination of the two.Experiments show that the auto-focus image processing meets the requirements of the focusing accuracy of airborne electro-optical imaging devices.

    Applications of Symmetric Turntable in Microwave Process
    YANG Fanghong,WU Zhiming,LU Longlong
    . 2013, 26(6):  16. 
    Abstract ( 1076 )   PDF (530KB) ( 820 )  
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    In order to improve the processing of microwave device qualification rate,we apply the symmetric table in microwave devices processing hardware facilities,and analyze the characteristics of symmetrical machining.Taking a microwave device processing as an example,the paper briefly introduces the application of symmetric turntable.Practice has proved that the use of symmetric turntable improves microwave device processing quality and reduces the cost.

    Design of Coplanar 2×3 Switch Matrix Used in X-band
    XUAN Bin,GUO Wenshen
    . 2013, 26(6):  19. 
    Abstract ( 932 )   PDF (594KB) ( 841 )  
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    A design of coplanar switch matrix is proposed using some simple components such as single-pole-single-throw (SPST) chip switch,power divider and o-dB directional coupler to fix all the components in the planar.With chip and microstrip interconnected by wire bonding bump,the proposed switch is smaller,lighter,simpler,and more reliable than the classic switch matrix.Finally,an X-band 2×3 switch matrix is designed to validate the method with experimental results given.

    Design and Realization of Ku Band 4-Port Radial Power Combining
    LIU Yongwang
    . 2013, 26(6):  22. 
    Abstract ( 931 )   PDF (489KB) ( 886 )  
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    The thesis introduces the technology of radial combining.Then it analyses the electromagnetic of radial waveguide,and puts forward a new power combining structure.It designs the structure of Ku band 4-port power combining based on radial combining,and  simulates  the speciality of surface electricity distributing、electricity  energy density、insertion loss、standing wave by CST.The simulational result illuminates that this power combining,which has fine characteristics,applys for the demand of large output power and breaks through the technology bottleneck of engineering application.

    Hybrid Active Power Filter DC Bus Control Based on Dual Fuzzy Control
    GE Shuai
    . 2013, 26(6):  25. 
    Abstract ( 918 )   PDF (640KB) ( 832 )  
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    In view of the existing problems of overshoot and static error of DC bus voltage control methods,a design of hybrid active power filter control system is presented in this paper.In the system,a hybrid active power filter system model is established.In order to control DC bus voltage,a double fuzzy controller is designed as well.The Matlab simulation results show that the system has the advantage of faster response,smaller static error and overshoot over traditional DC voltage control methods.

    Principle and Design of Compact PCI Hot Swap Technology Under VxWorks
    XI Zhihong,FAN Baojun
    . 2013, 26(6):  28. 
    Abstract ( 957 )   PDF (540KB) ( 1245 )  
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    Hot swap is the most outstanding and attractive technology of Compact PCI bus,which resolves the users' requirements of stability and small redundancy.This article analyzes three hot swap principles of Compact PCI bus system,and a hot plug system based on complete hot plug is designed.As for the hardware,hot plug power supply adopts LTC1631 and the PCI bridge chip uses PCI9030.As for the software,hard real-time operating system takes VxWorks.After an analysis of the VxWorks operating system construct and device driver program,the designs of drivers and monitoring program are given to achieve the function of hot swap.

    A Method for Enhancing the Testability of Telemetry Signal Processor
    ZHU Dangjie,JIANG Xuedong
    . 2013, 26(6):  31. 
    Abstract ( 738 )   PDF (731KB) ( 791 )  
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    The design principle of telemetry signal processor is introduced.A method by introducing an additional hardware circuit and taking advantage of the rest logic resource in FPGA is given to enhance the fault detection rate and test coverage of telemetry signal processor hanging on the aerobat.BIT of telemetry signal processor is realized by designing self-checking module based on this method.

    Design of Chaos Weak Signal Detection System Based on LabVIEW
    SI Shuping
    . 2013, 26(6):  34. 
    Abstract ( 1117 )   PDF (710KB) ( 819 )  
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    For weak sinusoidal signal detection and subsequent signal processing,a chaos weak signal detection system based on LabVIEW structures with LabVIEW favorable external interface capabilities is proposed,which is of practical value.The Lyapunov exponents are employed for weak sinusoidal signal detection,and the test results prove the feasibility of the program.

    Design of a Novel Phase-Detector for IFM Application
    LIU Xing,ZHAO Peng,WANG Zhiqiang
    . 2013, 26(6):  37. 
    Abstract ( 992 )   PDF (691KB) ( 820 )  
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    The application of log-amplifier AD8309 in Instantaneous Frequency Measurement (IFM) is described.With the phase detector based on AD8309,it successfully applies on the IFM part of an AFC.With an input RF signal frequency 298~318 MHz,a power of -50~+20 dBm,and a modulation pulse of 150 ns,it realizes a precision of 150 kHz with the nicety less than 300 kHz.The phase detector has the advantages of narrow modulation pulse width and wide dynamic range.

    Dual Redundant Signal Fault-tolerant Processing and Fault Injection Method
    WANG Mei,JI Jin
    . 2013, 26(6):  40. 
    Abstract ( 1011 )   PDF (525KB) ( 780 )  
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    In the fields of aviation,aerospace,and industrial control,in order to improve system reliability and fault tolerance,redundant design is necessary for key signals,dual redundant signal being an often used redundancy strategy.This paper introduces a dual redundant processing technology,and at the same time in order to reduce the cost of system development,the design uses a software fault injection technology to authenticate and verify the processing technology.The results show that the technique is effective and feasible.

    Design and Implementation of the High-speed Encryption Card Based on FPGA
    PENG Yang,MENG Lilin,LI Nian,LI Li
    . 2013, 26(6):  42. 
    Abstract ( 1148 )   PDF (629KB) ( 930 )  
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    In order to enhance the security of information,the paper develops a high-performance encryption card based on FPGA chip.The card uses PCI Express bus to communicate with the host.NiosII soft processor core and PCI Express hardcore are built in the FPGA,which fulfill controlling and communicating function.The card includes SM1 algorithm and RSA algorithms to encrypt and decrypt data.The method that integrates a variety of functions on a piece of FPGA chip simplifies the structure of the circuit board and improves the reliability of the encryption card.Actual test shows that each function of the card is correct and the operation speed is high.The card has achieved the expected goal and has a good application prospect.

    Direction Finding of Automatic Tracking in Relay Terminal of Launch Vehicle
    YU Xiao,XIONG Jianlin,LIU Bin,XIAO Lei
    . 2013, 26(6):  46. 
    Abstract ( 1011 )   PDF (627KB) ( 794 )  
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    Capture and tracking for TDRSS of relay terminal of launch vehicle is the primary precondition of establishing the data links between relay satellites and launch vehicle.In view of the narrow beam in Ka-band and the strict requirement of the pint-sized equipment by launch vehicle,the automatic angle tracking with assistant information of launch vehicle is put forward.The simulation results show that high performance of precision of direction finding can be achieved with this technology.It provides references to system design and engineering of automatic tracking in relay terminal of launch vehicle.

    RFID System Design Based on the MC2833 and MC3362
    JIANG Tianliang
    . 2013, 26(6):  49. 
    Abstract ( 1281 )   PDF (717KB) ( 744 )  
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    An RFID system consists mainly of the reader and the transponder.The reader contains the high frequency receiving module,control unit and transponder connected coupling element.High frequency receiving module adopts the monolithic integrated MC3362 receiving chip as the core,combining MC145151 to constitute a phase locked loop for the reception of transponder information.The transponder is made up of the coupling element as well as the high frequency emission module.All the energy required by its work is provided by the coupling coil,and the automatic switch is employed to control the on and off of transponder power in order to reduce power consumption.

    Specific Emitter Fingerprint Feature Extraction Based on Bispectrum Theory
    ZHANG Chunjie,LI Na,ZHOU Mo
    . 2013, 26(6):  53. 
    Abstract ( 1074 )   PDF (840KB) ( 647 )  
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    In light of the difficulty in specific emitter fingerprint feature extraction,this paper presents methods for extracting fingerprint features based on bispectrum slice and bispectrum contour line integration.Firstly,this paper introduces non-intention modulation of BPSK signal,the time domain waveform of BPSK signal in the ideal case and containing the phase noise.Then bispectrum estimation of radar signal containing phase noise is elaborated.Bispectrum graph and contour graph of BPSK signal containing phase noise is simulated by the computer.Finally,we use bispectrum slicing method and bispectrum contour line integral method to extract specific emitter fingerprint feature,and validate the implement by the computer simulation.

    Design of Ku-Band Radar Receiver
    LIU Qiang,MA Zhangang
    . 2013, 26(6):  58. 
    Abstract ( 968 )   PDF (581KB) ( 1035 )  
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    An important circuit in wireless communication system,the radar receiver's main role is to zoom in and processing of the echo reflected back to the radar after launch,and to filter the echo by obtaining the most useful echo and unwanted interference between the identification rate of the echo.The article describes the working principle of the Ku-band radar receiver,and presents the design and test results analysis.The Ku-band receiver consists of the low-noise inverter unit,the IF amplifier unit,four independent units of the local oscillator unit and the power supply unit.A detailed analysis is made of the circuit design of each unit,the component selection and the simulation results.The results show that with a Ku-band receiver noise figure≤1.0 dB and gain≥55 dB,the input and output standing wave,the phase noise spurious and image rejection indicators meet the technical requirements.Further improvement of some indicators of the Ku-band receiver is proposed based on test results.

    Application of Feed-forward Technique in Satellitic Solid State Amplifier
    NIE Shenglai
    . 2013, 26(6):  61. 
    Abstract ( 968 )   PDF (557KB) ( 713 )  
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    Feed-forward technique is an effective method for improving the linearity of solid state amplifier.In order to satisfy the requirement of high-linearity in satellitic solid state amplifier,with the product developed by the 13th Research Institute the paper introduces a classic feed-forward super-linear technique using satellitic solid state amplifier.The paper analyses the feed-forward super-linear principle,preferences of the solid drive amplifier,main amplifier,error amplifier and the choice of vector modulator and adaptive circuit of the amplifier.The third-order intermodulation of satellitic amplifier using feed-forward super-linear technique is smaller than -50 dBc,i.e.an improvement by more than 30 dB relative to traditional solid state amplifier.

    Effect of Substation Commissioning on Hidden Failures of the Secondary Circuit
    LI Jianping
    . 2013, 26(6):  64. 
    Abstract ( 942 )   PDF (422KB) ( 741 )  
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    The domestic demand for electrical energy is increasing with the social and economic development.The expansion of the power system requires higher on its safe operation.The secondary circuit has an important role in guaranteeing the reliable operation of the power system and the quality of power supply.However,in the secondary circuit there are always hidden failures,which seriously affect the normal operation of the power system.On the basis of an introduction to the secondary circuit hidden failures,the impact of substation commissioning on the secondary circuit of hidden failures is analyzed and preventive measures and treatments of are given.

    PWM-Based Reactive Power Compensation System Design
    WANG Shaowei
    . 2013, 26(6):  66. 
    Abstract ( 1047 )   PDF (849KB) ( 877 )  
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    With the development of modern industry,more and more industrial electrical equipment with low power factor are connected to the power grid,which puts forward higher requirements for the stability of the power gird and the voltage quality.Based on the principle of reactive power compensation,this paper research and design a reactive power compensation devices of continuously varying capacitance with the principle of PWM.The compensator overcome the traditional device's disadvantage that use perceptual reactive cover capacitive reactive to produce adjustable capacitive reactiveand improve the status that existing reactive power compensation devices can only cast slice grouping-and-grading and don't have the ability of continuously varying capacitance of capacitors,it can track the load variation quickly,compensate the reactive power in real time,stable the voltage of power grid,and increase the power factor.

    Analysis of the Thyristor Switch Based on the TSC Control Technology
    HUANG Xiaowei,WANG Dong,LIU Yi,WANG Zhao
    . 2013, 26(6):  71. 
    Abstract ( 919 )   PDF (440KB) ( 759 )  
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    An analysis is made of the existing problems of the thyristor switch based on the TSC control technology.The selection of Petersen coil for the thyristor switched capacitor and the impact of reactor size on the overall circuit and existing current mutations are discussed in order to ensure the thyristor's faster switching.

    Design of a Energy-saving Temperature Controller
    LIU Ying
    . 2013, 26(6):  73. 
    Abstract ( 1050 )   PDF (702KB) ( 924 )  
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    High power consumption of large-scale public buildings has become the bottleneck in the development of China's building energy efficiency.A method based on 89C51 microcontroller and can-bus is adopted to achieve energy-saving temperature controller.The paper gives the general design and pins connect of the major circuit diagrams,and designs the system software in accordance with the functional requirements and the actual circuit with the detailed flow chart given.The software and hardware of the chip microprocessors are debugged to achieve corresponding functions.

    Design of a Launcher Outfield Tester with the Wireless Module
    PANG Xiao,ZHANG Hongbin
    . 2013, 26(6):  77. 
    Abstract ( 981 )   PDF (643KB) ( 778 )  
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    As the traditional tester of launch installation of air to air missile can not communicate with the plane directly,a tester with wireless device has been designed.The tester can communicate with plane by wireless signal,which improves the test efficiency.And the substitution of the wireless module for the man-machine interface such as the display reduces the size and weight of the tester,thus easier use and better mobility.

    A Level Control System Based on the Single-chip Microcomputer
    WU Zaiqun
    . 2013, 26(6):  80. 
    Abstract ( 1047 )   PDF (361KB) ( 1112 )  
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    In order to realize accurate control of the water level in the container,we propose a system using AT89S52 as the main control chip and with the 24 high precision A/D conversion chip HX711 to process weak voltage signal variation of the weighing sensor output.The signal variations are converted into digital signal and then the corresponding water level value are displayed on the LCD screen 12864 using software.The test results show that the error value between the displayed water level and actual value is less than or equal to 0.2 mm,while the error value between setting value of water level and actual value is less than or equal to 0.4 mm.Results demonstrate that this system has good stability,high accuracy and certain application value within the scope of automatic water level control.

    Display Technique of the LCD Module Based on the T6963C Controller
    WANG Yongzhong,HAN Runping
    . 2013, 26(6):  82. 
    Abstract ( 913 )   PDF (618KB) ( 755 )  
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    The hardware structure,characteristic and usage of LCD module based on T6963C controller are presented.The hardware interface circuit between the MCU and the LCD module is introduced.The function and features of the status word and instruction set of T6963C are described.The display techniques for characters and Chinese characters used in LCD module based on T6963C controller working in graphic display mode are explicated in the paper.

    Design of a Host/Slave USB Interface Based on SPORTs of Blackfin 533
    SUN Hao,WU Zixian,WANG Jiajia
    . 2013, 26(6):  85. 
    Abstract ( 1011 )   PDF (678KB) ( 1026 )  
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    This design realizes the communication of SPORTs and CH376 by using SPI interface protocol.This article describes the design of Host/Slave USB Interface based on SPORTs of Blackfin 533 DSP,including the configuration of SPORTs interface,the hardware and USB driver,the driver of CH376 chip and so on.It achieves the writing and reading access from DSP to the USB storage device and the communication between the computer and DSP.According to the tests,the overall design can realize fast writing and reading on the U disk and easy communication between the DSP and PC.

    Leap Second Time Processing on IRIG-B Code Terminal
    YANG Zhigang,ZHENG Lili
    . 2013, 26(6):  89. 
    Abstract ( 1034 )   PDF (726KB) ( 1557 )  
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    The leap second violates the rule of 60 seconds per minute.The aerospace monitoring and trajectory control,time-frequency subsystem IRIG-B code terminal needs to adapt to the leap second time adjustment in order to meet the needs of the monitoring and control system.A method for time information and leap second processing is proposed,by which the IRIG-B code terminal is able to adapt to the leap second time to achieve the unity of time between the monitoring stations.Different external reference conditions for leap seconds on IRIG-B code terminal equipment are simulated,which verifies that the terminal has good adaptability to leap seconds with easy and flexibility adjustment on different bases.

    Design and Development of Phone Games Based on the Android System
    QU Yunhui
    . 2013, 26(6):  94. 
    Abstract ( 1066 )   PDF (415KB) ( 855 )  
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    This article analyses the features of the game on the Android system,introduces the design and architecture of mobile phone game,and develops the mobile phone game “rotating blocks” on Android,which has a certain reference value for other mobile phone game development based on Android system.

    Modeling of Digital Current Mode Controlled Buck Converter
    XU Zhen,ZHAO Chen
    . 2013, 26(6):  96. 
    Abstract ( 961 )   PDF (874KB) ( 963 )  
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    In view of the poor dynamic response of digital and analog controller chip,the digital current step-down model of change is analyzed.Reasonable slope compensation can result in current loop stability and a controlled current source.Voltage sampling points will determine the time delay of the system,guaranteeing that the sampling information in the shortest possible time be used in digital systems.Simulation and experimental results of frequency domain and time domain validate the feasibility of the mathematical model.

    Research on the Transactional File System Based on FRAM
    YU Songtao,YU Dalei
    . 2013, 26(6):  100. 
    Abstract ( 905 )   PDF (714KB) ( 1096 )  
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    The transactional file system can keep track of the final steady state of the file system to ensure that in any power loss environment it can still work correctly.Given the characteristics of the FRAM transactional file system design,the driver and application interface designs are given,and a comparison in performance is made of different memory-based transactional file systems.Experiments show that the our design enjoys easy management and fast write speed,protects critical system and user data from corruption in case of power failure,saves the need to restart the lengthy disk detection,reduces the difficulty of application programming,and speeds up the restart.

    Design of the General Platform for Airborne Computer ATE
    LIU Jie
    . 2013, 26(6):  104. 
    Abstract ( 992 )   PDF (552KB) ( 842 )  
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    This paper presents a test platform based on PXI bus for the general design of automatic test equipment.An explanation is given of the PXI testing system,adaptor and switch network.The design of test software and fault diagnosis system is introduced with emphasis on the key technologies of this system,such as the universal usage,fault diagnosis and orientation.The design concept of this test platform provides important guidance for the general test platform design of airborne computer.

    Data Acquisition System Based on LabWindows/CVI
    ZHOU Zilong,WANG Zhaofeng,WANG Shuhong
    . 2013, 26(6):  107. 
    Abstract ( 1092 )   PDF (891KB) ( 902 )  
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    A data measurement system using LabWindows/CVI and DAQ/PXI-2005 data acquisition card is introduced.The measured characteristic signal is translated by the sensor into an electrical signal,which then is sent to the processor by the data acquisition card.The data processing and displaying interactive interface is built with labWindows/CVI to realize the feature measurement.The system can be used to display the real-time features of the measured object,modify the various data acquisition parameters,display the waveform of the data collected,and store and recall the acquired data.

    Information Integration Research Based on PDM System
    JIAO Xiaoyan,CHEN Zongli,ZHENG Haiying
    . 2013, 26(6):  111. 
    Abstract ( 896 )   PDF (504KB) ( 788 )  
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    PDM system,as the product data management system,is responsible for generating and managing product design data.According to the information construction plan,a system based on the PDM information integration research is proposed.The PDM system serves as the only data source of the information system construction to manage the product data,materials,and components and to feed the information to the MES,MSM,and process management system for various system applications,thus realizing the unified management and sharing of information.

    Design of CAN Bus Network Monitoring Software
    MA Longhui,LIU Baofu
    . 2013, 26(6):  114. 
    Abstract ( 1068 )   PDF (526KB) ( 783 )  
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    A software scheme for monitoring,analyzing and recording the status of controller area network (CAN) is proposed and implemented.The software requirements and implement consideration of main parts are introduced in details,and the key technology of this software is analyzed.By real tests in various application scenarios,the correctness of the design is validated.

    Meticulous Management of Large Construction Sites Based on RFID Technology
    HUANG Jing,WEI Guomin
    . 2013, 26(6):  117. 
    Abstract ( 1115 )   PDF (471KB) ( 731 )  
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    Large-scale and intelligent building involves various types of work,high technology and a large management system,which includes security management,material management,asset management,file management,etc.The new radio frequency identification (RFID) technology is adopted for the meticulous management of large-scale construction site,thus greatly improving the work efficiency and saving material,manpower and time.

    A Smart Controller for Multimedia Applications on Heterogeneous Dual-core System
    YANG Yang
    . 2013, 26(6):  119. 
    Abstract ( 740 )   PDF (723KB) ( 851 )  
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    Inefficient task management in heterogeneous dual-core embedded systems causes frequent Inter-Processor Communication (IPC) between MPU and DSP,thus lowering the system performance.To promote the performance,a Smart Task Controller (STC) for multimedia applications is proposed.It can dynamically manage tasks and effectively reduces IPC.A dual-core virtual platform constructed by ESL design platform and a 256×256 pixel JPEG image encoder are used as implementation.It turns out that STC reduces 15%~68% total execution time comparing with task management on MPU and DSP.

    Implementation of Demo Test Software Based on the VS 2008
    LIU Dahong,WANG Feng
    . 2013, 26(6):  122. 
    Abstract ( 941 )   PDF (630KB) ( 793 )  
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    Demo test software is a single document interface program based on visual studio 2008 development tools.Its main function is to generate a playlist file of display information which will be on the screen in highway,this playlist file includes screen number.each screen stay time,the way and speed of display font,the position,font size,and font color and font Spacing of display font on the screen,this function through the “add”,“delete”,“send” and “list”,“save” the five button to achieve.

    A Clustering-based Routing Algorithm in Wireless Sensor Networks
    FU Jingbo
    . 2013, 26(6):  124. 
    Abstract ( 754 )   PDF (729KB) ( 705 )  
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    An algorithm based on clustering in WSNs is presented to solve the problem of energy distribution.If the node has enough energy,we use bifurcated approach to select cluster head.Between the cluster heads,the data should be sent through multi-hops to sink.The optimal path for each cluster head is computed by a cost function of energy consumption.In order to further reduce energy consumption,it uses data aggregation in cluster.And experimental results demonstrate that the proposed algorithm prolongs the lifetime of network.

    Distributed Formation Tracking Control of the First-order Discrete Multi-agent System
    LIN Tao,HAN Nani,LIU Yangkui
    . 2013, 26(6):  128. 
    Abstract ( 800 )   PDF (669KB) ( 500 )  
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    This paper investigates the distributed formation for discrete-time multi-agent systems with a time-varying reference state in fixed directed communication topology,by which the agents can be able to track the time-varying reference state while maintaining the desired formation.First,the protocol for the first-order system is proposed with the sufficient and necessary condition given for sampling stability,and then the quantitative bound of the tracking error is studied.It is shown that the ultimate bound of the tracking error is proportional to the sampling period.And the simulation results illustrate the effectiveness of the designed protocols.

    A High-performance Hardware Architecture for Hummingbird Cryptography Algorithm
    ZHAO Wei,HUANG Kaichen,LUO Yonghong
    . 2013, 26(6):  131. 
    Abstract ( 954 )   PDF (519KB) ( 744 )  
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    Hummingbird encryption algorithm is a lightweight encryption algorithm for RFID tags and other hardware limited system.The Hummingbird algorithm has been verified on different platforms.The paper proposes a Hummingbird algorithm architectures,which requires less hardware resources than the other methods with the the same response time.It uses a low-end Xilinx Spartan-3 FPGA chip as the verification platform.Experimental results show that this architecture can be preferably embedded into the hardware constrained systems,especially in embedded systems.

    An Improved ADS-B Signal Preamble Pulse Detection Algorithm
    XU Zhe,KANG Yong
    . 2013, 26(6):  134. 
    Abstract ( 745 )   PDF (534KB) ( 966 )  
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    This paper discusses the principle and status of the ADS-B technology,and then gives a brief introduction to the format of the ADS-B signal,based on which this paper analyzes the detection algorithm of the 4 head pulses in detail.Considering the high miss detection ratio of the 4 head pulse algorithm,this paper presents an improved joint fiducial probability distribution algorithm.The simulation results show that the improved algorithm achieves better performance in reducing the miss detection ratio than the formal algorithm.

    Design of a Universal Avionics Simulation Platform Based on the Reflective Memory Network
    BAI Xi,ZHANG Peng
    . 2013, 26(6):  137. 
    Abstract ( 738 )   PDF (598KB) ( 604 )  
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    For the shortcomings of poor versatility and real-time simulation support of traditional avionics simulation platform,this paper designs an universal avionics simulation platform based on reflective memory network technology.The platform uses a distributed simulation structure to support the all digital and semi-physical simulation,meeting avionics simulation requirements of versatility,real-time performance,ease use and scalability.Tests on prototype system show that the design is feasible.

    Design of the Interconnecting Gateway Between CAN Bus and Ethernet Based on LPC2294
    ZHANG Zhongmin,WU Xiaojing
    . 2013, 26(6):  140. 
    Abstract ( 901 )   PDF (890KB) ( 612 )  
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    In order to meet the interconnection need of Ethernet and CAN bus network,a gateway module based on the LPC2294 controller chip and embedded μC/OS-II operating system is designed,which realizes the protocol conversion between Ethernet and CAN bus.The paper introduces the hardware and software design in detail with emphasis on the custom UDP packet structure the gateway module uses.The packet structure can provide more management information,and is conducive to the management of the network.The tests show that the design of module has good practicality and reliability.

    The Design and Realization of Community Remote Health Care Network System
    LIU Minfeng,ZHANG Haokun,NIE Pengpeng
    . 2013, 26(6):  145. 
    Abstract ( 904 )   PDF (871KB) ( 499 )  
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    In order to promote community health care networking and informatization,this paper research and design a community remote health care network system based on B/S structure.The system bases on LAMP platform network architecture,using Joomla! Content Management System based on the MVC design pattern and Servlet for the development of design.The system realizes the residents' blood oxygen,ECG and other physiological parameters' remote monitoring,and realizes the health record registration.

    Study and Simulation of Long-time Coherent Integration with Keystone Transform
    LI Chunlin,WU Linyong
    . 2013, 26(6):  148. 
    Abstract ( 876 )   PDF (931KB) ( 530 )  
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    Long-time coherent integration is a key technique for small moving targets detection under low signal noise.However,the integration and detection for long time should deal with the problem resulting from target range-cell-crossing.An effective way is to employ keystone transform to compensate the influence of range migration,thus achieving coherent integration of all moving targets regardless of their unknown velocity.The paper presents a complete set of algorithms for radar signal processing,and the effectiveness of the algorithms is confirmed.

    Synthesis and Design of the Multiplexer
    YOU Xin,WANG Xiliang,SONG Jiaxing,GUO Xiang
    . 2013, 26(6):  153. 
    Abstract ( 732 )   PDF (654KB) ( 778 )  
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    This paper illustrates a method for the synthesis of microwave multiplexer with characteristic polynomial.Using iterative algorithm,the characteristic polynomial of multiplexer and arm filter can be optimized in a law-pass frequency domain.By this method,the coupling coefficient can be calculated for each branch.With the impact of the remaining branches of the multiplexer in consideration,the filter optimization time is shorter than before.The transmission zeros of each branch filter can be given any value.The method is also applicable to the synthesis of duplexer and multiplexer.Finally,using software Ansoft Designer,a multiplexer is designed.The simulation curve is consistent with the expected one.

    Application of the Beidou/INS Integrated Navigation Artificial Fish-swarm Particle Filter
    LI Jiasen,XI Zhihong,ZHAO Yanqing
    . 2013, 26(6):  157. 
    Abstract ( 937 )   PDF (828KB) ( 623 )  
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    In order to solve the problems of particle degeneracy and particle impoverishment in particle filtering,a new particle filter which based on the dynamic artificial fish school algorithm (DAFSA-PF) is proposed in this paper.This algorithm uses the foraging behavior and cluster behavior in resample process of particle filtering to adjust the step of artificial fish based on the dynamic ratio of probability density dynamically.The new algorithm overcomes the problems of particle degeneracy and particle impoverishment by increasing the diversity of particles,drives the particles to the optimum area,enhances the global search ability of particles,and avoids the particles falling into local optimum areas.This DAFSA-aided Particle Filtering technology is applied in the tight coupling Compass/INS system model.The existing artificial fish school particle filtering algorithm is compared with the conventional particle filtering algorithm.Simulation results show that the DAFSA-aided Particle Filtering algorithm improves the estimation accuracy significantly,thus becoming a new method for Beidou/INS integrated navigation.

    Paperless Examination Management System Based on the SSH Framework
    ZHOU Chunrong
    . 2013, 26(6):  162. 
    Abstract ( 1279 )   PDF (624KB) ( 733 )  
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    In order to reduce the workload of the test center staff in computer exam management,reduce the risk of errors and improve timeliness exam information and query results,a paperless examination system based on SSH framework is designed.Test shows that system achieves the design goals.

    Design of the Traffic Light Comprehensive Experiment Based on AT89S52
    HAO Wenyan
    . 2013, 26(6):  164. 
    Abstract ( 961 )   PDF (799KB) ( 610 )  
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    This article describes the comprehensive experiment design of a simulative traffic light control system.The simulation system uses AT89S52 devices as the core and applying varied interrupt processing and time-sharing multiplexing function with P port to control the display of digital tubes and LED lights,thus realizing normal indication and countdown function of the traffic lights in a variety of situations.The software such as Keil C51,Proteus,Protel are used in the comprehensive experiment.The statistics data show that learners can master single chip Microcomputer programming better by doing the experiment.

    Application of the PSpice Simulation Software in the Experimental Teaching of Analog Electronics Technology
    ZHANG Libing,CHEN Fuyi,CHEN Liangliang,TAO Dajin,ZHU Xiuwei,LIN Xiaolei
    . 2013, 26(6):  167. 
    Abstract ( 1129 )   PDF (894KB) ( 866 )  
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    The main functions and characters of PSpice simulation software are introduced in this paper.And then,through specific teaching examples,the applications of PSpice simulation software are further expounded in teaching the analog electronic technology.It realizes the combination between theory and practice to use PSpice simulation software in the experimental teaching of analog electronic technology,which is a beneficial supplement for and improvement to the classical teaching methods.

    An Overview of Hand Gestures Recognition
    WU Xia,ZHANG Qi,XU Yanxu
    . 2013, 26(6):  171. 
    Abstract ( 2083 )   PDF (770KB) ( 3199 )  
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    In recent years,with the development of human-computer interaction and computer vision,gesture recognition research has made tremendous progress.In this paper,we summarize the research and development status of the gesture recognition.First,the development process of the gesture recognition is introduced.Furthermore,several gesture recognition technologies are based on the general flow of the gesture recognition are proposed.The conclusion and the future scope are given eventually.

    Construction of a Library Based on the Cloud Computing Platform
    CHENG Wenfang
    . 2013, 26(6):  175. 
    Abstract ( 825 )   PDF (434KB) ( 600 )  
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    Cloud computing platform has powerful data processing,storage,and network services,effective data management.Most libraries have achieved the transformation of the traditional library to digital one.At the same time,the library's data storage is facing such problems as security,access to space,speed and management.Cloud computing platform is an effective way to solve the above problem for the library.

    Research on and Application of Power Harmonic Detection
    WANG Chi,FANG Hua
    . 2013, 26(6):  177. 
    Abstract ( 999 )   PDF (590KB) ( 662 )  
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    The existing harmonic detection methods are classified and analyzed in terms of detection precision and real-time performance with emphasis on the immune neural network theory and sophistication.The feasibility of its application in the electric power harmonic detection is discussed theoretically.The electric power harmonic detection method research progress and development trend are presented.

    Design and Implementation of the Desktop Literature Data Information Sharing System
    YANG Ruihua,ZHANG Jianhua,YU Yan,XIANG Dao,LIU Jian,LIAO Mingqiang
    . 2013, 26(6):  180. 
    Abstract ( 908 )   PDF (550KB) ( 642 )  
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    This article describes the conventional electronic information sharing model,introduces a new timeliness Desktop information sharing mode,and discusses the key technologies used by the software.It provides references to software programming and technical personnel in developing a similar system,and offers a new perspective of information sharing.

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