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Table of Content

15 February 2013 Volume 26 Issue 2
  
    Articles
    Study on the Sound Navigated Car
    DU Lanqing,LIN Ju,LI Ruiqin,GAO Yun,WANG Hongchao,YANG Chao
    . 2013, 26(2):  1. 
    Abstract ( 753 )   PDF (551KB) ( 1010 )  
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    This project uses a specific frequency sound signal as the sound source of the car navigation,so that the car can be implemented by receiving and processing signals.The car determines the sound source direction and position,and proceeds to the sound source.Hardware filtering circuit is employed to filter the sound signal and the time difference of the acoustic signal arrivals is computed with FPGA,and the microcontroller calculates the angle and distance of the sound source deviating from the trolley and generates a PWM wave to drive the motor.In the process of moving the car can track moving sound source independently and correct movement path.Reaching the accurate sound source is the focus and difficulty.

    WiFi-based Remote Video Transmission Intelligent Robot Design
    ZHANG Xuewu,HE Yujun
    . 2013, 26(2):  4. 
    Abstract ( 993 )   PDF (729KB) ( 1198 )  
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    WiFi wireless technology has been widely used due to its larger area coverage and higher transmission rate.This paper studies the application of wireless video transmission technology in mobile robots.The WiFi Robot designed in this paper is an intelligent system which uses highly mature WiFi wireless network for the data transmission carrier to realize real-time control,video transmission,data collection and other functions.The test proves that the WiFi Robot can be applied in various fields both civil and military,such as counter-terrorism detection,C4ISR system,fire rescue and life detection.

    Design of Coulomb Counter System Based on 2 to 4 Cells Lithium-powered Battery Pack
    FAN Tengfei,CHEN Yimei
    . 2013, 26(2):  7. 
    Abstract ( 1007 )   PDF (599KB) ( 1429 )  
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    Coulomb counter is used to monitor the electric quantity.It has high-precision,but the technology is complex and expensive,which confines its application.This paper proposes an implementation of the coulomb counter system based on 2 to 4 cells lithium-powered battery pack.The main controller uses MSP 430G2001,and coulometer chip BQ27210 completes the signal processing of the electric quantity.The designs of hardware and software are given and related issues are introduced.The designed Coulomb Counter System has high-precision,self-learning ability,low cost,high reliability,portability,scalability,practical value and is referential for engineers.

    GSM-based DTMF Controlled Vehicle
    YANG Runfeng
    . 2013, 26(2):  11. 
    Abstract ( 966 )   PDF (722KB) ( 967 )  
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    When people can not access some dangerous places to work on-site,a smart vehicle can be used instead.Recently,Dual Tone Multi-frequency (DTMF) makes out-coming call quicker and it is used in interactive control system,and even in wired or wireless communication systems.With real-time control and low cost requirements of the project in mind,DTMF based on GSM network is adopted to control a vehicle equipped with stepper-motors.The vehicle can be driven with great precision in real-time and accomplish the required moving task.

    Simulation of Desert Scene for Land Clutter Radar Cross Section
    LI Jianjun,YU Lijuan,LIU Xuan
    . 2013, 26(2):  13. 
    Abstract ( 1010 )   PDF (996KB) ( 805 )  
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    Simulation of desert scene for land clutter radar cross section (RCS) is investigated in the paper,based on triangular facet model,an angular cutoff model of revised GO Model and γ-f  Model for backscattering coefficient and Digital Elevation Model (DEM) data of desert scene.The RCS matrix charts obtained by scattering characteristic model and geometric model of the scene demonstrate that the simulation results coincide mainly with special terrain features and periodic characteristics of the desert scene.The validity of the proposed model is then obtained.

    Multistage CIC Cosine Filter Based on Recursive Structure
    LI Gongfu,SHI Yu,ZHAO Baolin
    . 2013, 26(2):  17. 
    Abstract ( 1093 )   PDF (544KB) ( 853 )  
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    Since its realization does not require the use of multipliers and memory and that it has fast transform sample characteristics,the CIC filter is widely used in software radio.The traditional CIC filter is poor in linearity,namely insufficient band rejection and serious in-band distortion.Cascaded cosine filter is proposed to optimize the traditional CIC decimation filter performance by raising cosine filter roll-off of the stop band suppression and multistage speed to improve its efficiency and linearity.Simulation proves the validity of our method.

    Adaptive Inhibition Method for Signal & Noise of Position Sensitive Detectors
    LIU Baohong,XU Xiaoli,ZUO Yunbo
    . 2013, 26(2):  19. 
    Abstract ( 656 )   PDF (499KB) ( 921 )  
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    According to the noise source and characteristics of the position sensitive detector (PSD),an adaptive inhibition method based on FIR Wiener filter is proposed.The Wiener filter is used as digital filter and transmission characteristics are adaptively adjusted to improve the signal to noise ratio of PSD so that the accuracy of measurement in PSD application system is greatly improved.

    FPGA-based Video Acquisition and Display System
    LI Guoxing,YANG Fang
    . 2013, 26(2):  22. 
    Abstract ( 886 )   PDF (651KB) ( 1228 )  
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    A FPGA-based video acquisition and display system is designed and implemented,including  video image acquisition,processing and display.A CCD camera OV7670 is used for video data acquisition,and FIFO is constructed combined with the SDRAM high speed read to realize the processing of video image data in the FPGA.The FPGA Nios II embedded kernel is utilized for SDRAM control and real time TFT LCD video data display.The whole system is good in image acquisition and display performance.

    Design of DC Electronic Load Based on Msp430 Microcontroller
    LIU Lei
    . 2013, 26(2):  25. 
    Abstract ( 868 )   PDF (424KB) ( 854 )  
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    Using Msp430F169 microcontroller as the controller chip,with peripheral keyboard and LCD display module,A/D acquisition input circuit,D/A converter output circuit,multi-channel power output module and the constant current source output circuit and the system software,we fabricate a simple reliable and practical DC electronic load.The experiment tests show that the DC electronic load has good reliability,accuracy and anti-jamming ability.

    Detection and Location of Living Objects Using Microwave Based on Background Interference Cancellation[BT)]
    LI Chuan,SUN Shitao,Lü Guoqiang,YIN Zhiping
    . 2013, 26(2):  28. 
    Abstract ( 935 )   PDF (898KB) ( 841 )  
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    The detection and location of living objects using microwave radar is studied.In order to enhance the precision of the detection and the accuracy of the location of the living objects,two different methods for eliminating the background echo are proposed.If the living objects are relatively static,i.e.the target has no movement except breathing and heart beating,the data of a certain time are regarded as the background interference and are cancelled from the other data by a simple subtract operations.If the living object is moving or the body is largely swinging,the background interference is cancelled for the current data by subtracting the previous data with a fixed interval.Experiment shows the effectiveness of the proposed method.

    Design of High Precision Pressure Signal Amplifier Circuit Based on LabVIEW
    LIU Kuifang,HUANG Min,YAO Xiaomin
    . 2013, 26(2):  32. 
    Abstract ( 906 )   PDF (751KB) ( 893 )  
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    The amplification of small signal is very difficult and demanding for signal amplification and its stability and precision.The differential amplification technology is applied to the amplification of small signal because it has the characteristics of inhibiting common mode signal and amplifying only differential mode signal and the high gain.To meet the demand of high precision in system,the AD620 chip with differential amplification is employed in system design.The virtual instrument technology is used to collect and analyze the amplified signals and to program the display interface.Second order interpolation is adopted to analyze the measuring data,which validates the circuit precision.

    A Design of Radant Lens Phased Array Radar Transmission Channel
    JI Sheng
    . 2013, 26(2):  36. 
    Abstract ( 795 )   PDF (382KB) ( 825 )  
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    This paper introduces a phased array radar based on the concept of Radant lens with emphasis on the design of transmission channel,including its and the specific design,which introduces the transmission channel of the concrete,the design concept of frequency synthesis system,calculation of the output power level of the power amplifier module,the composition of high power T/R modules and the calculation of the antenna array dissipation power.Radant lens phased array radar with its reliability and cost advantage will play an important role in air defense and surveillance.

    Jamming of the Inverse Synthetic Aperture Radar
    CHEN Huiling
    . 2013, 26(2):  38. 
    Abstract ( 899 )   PDF (675KB) ( 735 )  
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    The interference measures of ISAR are usually divided into suppressive jamming and deception jamming.The power of suppressive jamming is supposed to be high because the gain is high when the radar processes the signal.The deception jamming mainly uses Digital Image Synthesis (DIS),which modulates the amplitude and phase of the signal-intercepted and then forms the false target.This paper makes a brief analysis of suppress interference and deception jamming.The Matlab simulation shows that suppressive jamming has higher jamming power.

    Simulation of the Electronic Countermeasure Battlefield Based on HLA
    SUN Qi
    . 2013, 26(2):  41. 
    Abstract ( 815 )   PDF (815KB) ( 668 )  
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    In order to achieve the reusability and interoperation of each part of electronic countermeasure battlefield simulation and to approach the real war circumstance in technology,this paper proposes a design of simulation system based on High Level Architecture (HLA).The characteristics,rules and some essential terms of High Level Architecture (HLA) are introduced and the flow of an electronic countermeasure battlefield simulation is described.

    A Method of Time Difference Measurement in Passive Location Systems
    QI Dazhi,MA Yatao
    . 2013, 26(2):  45. 
    Abstract ( 795 )   PDF (674KB) ( 932 )  
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    This paper discusses several basic methods of passive location and briefly introduces the principle of Time Difference of Arrival (TDOA) location.Current TDOA location systems are researched,and the advantages of them are described.A Short Time Fourier Transform (STFT) time difference measure is presented.Finally,a computer simulation of TDOA location system using STFT time difference measure is done,which shows this new method has the advantages of higher precision and so on thus improving the location precision of the whole passive location system.

    Spectrum Analysis Based on the Space Electromagnetic Signal
    REN Xi,WANG Xiaoli
    . 2013, 26(2):  49. 
    Abstract ( 560 )   PDF (627KB) ( 718 )  
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    This article analyzes the time domain and spectral characteristics of space electromagnetic signal.A method is proposed for constructing the space electromagnetic signal time-domain waveform according to radar equipment.Frequency spectrum of signals is analyzed to obtain the power size of detection point,which is helpful for us to analyze the space electromagnetic intensity distribution of complicated battlefield condition.Finally,simulation and detailed experimental analysis verify the correctness and effectiveness of the proposed method.

    Common Pulse Radar Transmitter Failure Analysis and Troubleshooting
    XU Jiaxun
    . 2013, 26(2):  52. 
    Abstract ( 764 )   PDF (558KB) ( 773 )  
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    With the wide application of radar,its performance is improved rapidly but the analysis and troubleshooting of the common faults of electronic components in the pulse radar transmitter remain in lack.As one of the core components of the radar,the pulse radar transmitter is a key factor of radar performance and safe use.This paper discusses the working principles of the pulsed radar transmitter,analyzes the common failures and their reasons,and presents the corresponding solutions.This article provides the basis for the safe use of the radar.

    Analysis of 2-D Triangulation Method
    ZHANG Xiao
    . 2013, 26(2):  54. 
    Abstract ( 1065 )   PDF (1651KB) ( 867 )  
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    The location of radiation sources has been playing an important role in radar countermeasure.Firstly,the basic principle of passive location method is introduced.And the analysis of how several factors can affect the accuracy of location is presented.Finally,the geometric distribution maps of location accuracy are given based on the Matlab simulations under different parameters.

    A Method for Solving Frequency Modulation Continuous Wave Radar Signal Leakage
    WANG Le,XI Yuanwang,LIU Hui
    . 2013, 26(2):  57. 
    Abstract ( 903 )   PDF (573KB) ( 742 )  
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    In view of the 3 mm band frequency modulation continuous wave radar signal leakage problem,an analysis is made of leakage mechanism,based on which the corresponding cancellation techniques are proposed.Cancellation can be realized by proper setting of the amount of coupling between two branches and the amplitude attenuation value,and adjustment of the phase of the cancellation signal by the phase shifter if the reference signal and leakage signal are roughly equal in amplitude,thus reducing the effect of leakage signal on receiver sensitivity.The experimental result and the analysis result is consistent.

    Design of Random m-sequence Based on LabWindows/CVI
    LI Shurong,YANG Xiong,HUANG Xiangkang,QIU Xuanbing,WEI Jilin
    . 2013, 26(2):  60. 
    Abstract ( 751 )   PDF (534KB) ( 967 )  
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    The generation,characteristics and construction of pseudo-random m-sequence are analyzed.A 2~22 m-sequence generators based on LabWindows/CVI development platform is designed.The simulation results show that the system has the advantages of remote communication,friendly interface and easy integration and extension.The system can implement the BER automation test of the wireless laser communication system.

    CT Image Median Filtering Algorithm Based on Different Shapes of Window
    CUI Jingwei,WANG Daxi,QIN Xiangping
    . 2013, 26(2):  63. 
    Abstract ( 985 )   PDF (1051KB) ( 1263 )  
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    CT is one of the important medical imaging tools,and CT image denoise is key to the medical image preprocessing.Median filter is one of the traditional filtering algorithms for removing the salt &pepper noise,which is good in filtering properties.The median filter filter window has a diversity of shapes,which are programed seperately in this article to study the effect the shape and size of the filtering window on the median filtering algorithm.The median filtering center pixel value selection and the amount of calculation in filtering processing are influenced.Experimental results show that the effect of median filtering have difference,and the algorithm can be combined with other filtering methods to better retains the detail of the image.This article provides valuable reference for further improvement of the median fitering algortithm and CT image denoising.

    Supply Transportation Monitoring System Based on BD-2 and GPRS
    ZHAO Rui,ZHU Zuli,ZHONG Bang,HU Kai
    . 2013, 26(2):  68. 
    Abstract ( 874 )   PDF (849KB) ( 676 )  
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    This paper puts forward the functions that a supply monitor system should have and introduces the positioning principle of BD-2 and communication principle of GPRS.Base on this,the monitoring center and terminal of the supply transportation monitoring system is designed,which has the advantages of precise positioning,low cost and easy use.The proposed system has great potential in supply transportation monitoring.

    Research on Pressing Line of Vehicles
    WANG Jianhua,XU Guili,MI Changjun,ZHAO Min,TIAN Yupeng,WANG Biao,XU Peizhi
    . 2013, 26(2):  71. 
    Abstract ( 1190 )   PDF (619KB) ( 1035 )  
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    Aiming at detecting the violation behavior of vehicle's line pressing,this paper proposes a method of vehicle's pressing line detection based on computer vision.First,the Hough transform method is applied to extract the yellow lines from traffic video images automatically;second,the background difference method is used to extract vehicles from images,and the otsu method segments the vehicles out,thus getting vehicle's position;Finally,the overlap of the yellow line area and vehicle area can determine the vehicle's line pressing.Experimental results demonstrate that this method can meet the requirements of accuracy and efficiency.

    Man-machine Interface Design and Implementation of Vehicle Virtual Instruments Based on Android[BT)]
    LI Peipei,ZHU Weijie
    . 2013, 26(2):  74. 
    Abstract ( 965 )   PDF (577KB) ( 1191 )  
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    Android of Google is adopted as the software development platform for the design of new man-machine interface.The existing system software architecture of Android is modified and adjusted to make it more suitable for new man machine interface of the Vehicle Virtual Instruments.Its functional modules are designed with the existing components of Android such as the SQL module,CAN module etc.,which make the design more reasonable with less inter module coupling.Its man-machine interface is designed based on REAL210.More functional and more user friendly,the new interface is easier to upgrade and maintain.

    Download Technology of Uninterruptible Power Application of STC MCU
    FU Wenyue,HUANG Min
    . 2013, 26(2):  76. 
    Abstract ( 724 )   PDF (542KB) ( 874 )  
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    As to download the program for MCU that the mechanical reset need to repeat a series of complicated debugging problem,presented a guide of using software to write the ROM instead of hardware reset method.The method is by testing the legality of the serial data stream to determine whether the ISP boot program execution,which means using software to reset.The MCU can be reset with STC ISP boot program,with the use of this feature to simulate MCU power-on reset,MCU can get the uninterruptible power download accomplishment.

    Temperature Measurement System Based on the SPI Interface
    KONG Ling-Rong
    . 2013, 26(2):  79. 
    Abstract ( 778 )   PDF (722KB) ( 994 )  
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    In the temperature measurement system based on the SPI interface,the ATmega16 microcontroller is used for control,integrated temperature sensor TC72 for collecting temperature,and LCD 1602 screen for data display.The system is composed of five modules:the temperature sensor,LCD display module circuit,matrix keyboard circuit,alarm circuit and ATmega16 single-chip microcomputer control circuit.The system can achieve real-time monitoring of temperature,the temperature of upper and lower limits setting and alarm functions.The design meets the requirements of social production temperature gathering and controlling.

    Design and Implementation of CAN Bus Driver in the Android System
    LI Yu-Jie, ZHU Wei-Jie
    . 2013, 26(2):  83. 
    Abstract ( 1255 )   PDF (630KB) ( 1010 )  
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    The implementation of CAN bus driver in the embedded operating system-Android requires not only the registration of CAN bus driver in the Linux kernel but also its call in the Android HAL layer.Take the CAN bus controller MCP2515 and S5PV210 microprocessor for example,this paper analyses the principles of Android devices and the processes development and methods of CAN device driver in the Android,and designs some important data structures and codes.Finally,the driver program of CAN bus driver is implemented.

    Research on Motion Control System Based on PCI-1240
    ZHOU Shi-Qun, WANG Ping
    . 2013, 26(2):  87. 
    Abstract ( 1045 )   PDF (611KB) ( 765 )  
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    Based on the industrial PC,a control system of step motor is designed by applying the motion control card PCI-1240 to realize the digital control.The control system adopts Microsoft Visual Basic to design human-machine interface.By using movement function library of control-card and altering pulse frequency dynamically,the direction and the velocity of the motor are controlled to realize the stepper motor control in the open loop condition.Practical application shows that this system has the advantages of low cost,high accuracy,good adaptability and desirable effect.

    Design and Implement of RSSI Positioning System on TinyOS Platform
    JIAO Gang-Zhu, LI Xue-Lian, ZENG Jian-Chao
    . 2013, 26(2):  90. 
    Abstract ( 1127 )   PDF (919KB) ( 741 )  
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    RSSI localization algorithm is a common localization algorithm for wireless sensor network node localization.RSSI positioning system is designed based on the software platform of NesC language and the hardware platform that includes the iris node and mib520 interface board provided by Crossbow.Experiments in indoor and outdoor environments prove the validity of the system.

    Design and Implementation of the Multimedia Classroom Intelligent Management System
    GAO Qiang, LI Zhong-Li
    . 2013, 26(2):  94. 
    Abstract ( 962 )   PDF (562KB) ( 684 )  
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    In view of the serious waste of electricity and poor utilization and management of college multimedia classrooms,an intelligent teaching building control system is designed using NXP company cortex M0 chip and with wireless gateway controllers as the core to realize the rational use of classroom electric equipments and better teaching management.

    Design of Multi-functional Comprehensive Communication and Control System Based on ARM9
    LIU Jia-Ning, JIAN Qin-Qin
    . 2013, 26(2):  97. 
    Abstract ( 962 )   PDF (531KB) ( 807 )  
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    This article introduces the framework and functions of each module of the multi-functional control and communication system which based on the hardware platform of ARM9 and adopts the embedded Linux as the operating system.This system is programmed in C-language based on POSIX.1 criterion,which can realize collection,analysis and storage of data frame transmitted from slave-machine,and can configure the baud rate of serial-port,data initialization time and mobile phone number or transmit stored data respectively according to master-machine instructions.

    Intelligent Street Light Control System Based on Wireless Communications
    ZHANG Ye-Jun, LI Gang-Jian, DENG Wei-Dong
    . 2013, 26(2):  100. 
    Abstract ( 1154 )   PDF (644KB) ( 765 )  
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    This paper introduces an intelligent street lighting control system based on wireless communication.The monitoring center achieves point telemetry,remote communication and remote control of the sub-controls,real-time monitors sub-control status and operating parameters,receives failure alarms and issues control commands through the terminal smart devices.The system also has the functions of graded alarm,operating authority control,statistical report printing and telephone alarms.

    The Design and Implementation of Wireless Indoor Monitoring Alarm System Based on ARM9
    XU Qing, LIU Fang
    . 2013, 26(2):  103. 
    Abstract ( 998 )   PDF (652KB) ( 872 )  
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    This article implements a wireless monitoring alarm system based on ARM9 and GPRS module.Details of the hardware and software design are given.The hardware achieves indoor environment monitoring and indoor appliances intelligent control,as well as the wireless alarm and remote control.A good human-computer interface is designed based on embedded LINUX operating system and Qt/Embedded application software.The system is low in cost,good in stability and fast in response with a very wide range of development prospects.

    Design and Implementation of the Angle Control System of Windsurfing
    LI Xiao-Qin
    . 2013, 26(2):  107. 
    Abstract ( 841 )   PDF (578KB) ( 684 )  
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    The system uses SCM (STC89C54RD) as the primary control device which can collect the quadrature signal of encoder in real time,and the encoder composed of HEDS9701 groove coupler and grating chip to obtain the angle information of the windsurfing,thus the actual angle.According to the actual and target angle values,the PID algorithm is adopted to obtain the control parameters and adjust the PWM parameters for controlling the fan speed,thus realizing the angle correction and dynamic control of the windsurfing.

    Automatic Continuous Zoom Video Microscope Based on Embedded Systems
    ZENG Chi-Liang, CAI Lin, CHEN Gang, LIAO Wen-Zhe
    . 2013, 26(2):  110. 
    Abstract ( 1145 )   PDF (784KB) ( 701 )  
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    This paper introduces the general design ideas which apply embedded technology to the monocular zoom video microscope,achieving rapid automatic zoom,auto-focusing and testing while reducing costs.This paper expatiates on the key technologies of electric control zooms and auto-focusing.The technical route of this design is that use the small module gear realizes mechanical motion and transfer power,using single-chip microcomputer control circuits to realize the acquisition of count pulse and the control of motor.This system realizes zooms and auto-focusing in zoom video microscope by control motors according to predetermined setting.This design can meet the requirements of online automatic detection in industrial production process and provides a feasible scheme for visual inspection machine.

    Highway Rear-end Early Warning Systems Design
    LI Bai-Ming
    . 2013, 26(2):  114. 
    Abstract ( 906 )   PDF (575KB) ( 805 )  
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    The overall structural design of the the highway car rear-end warning system,the system is divided into seven parts of the master module,information processing module,power module,alarm module,brake modules,memory modules,and communication module.From a hardware point of view of the various modules of functional analysis,selection of the device.Eventually,the entire process from the perspective of software design.

    Improvements on Debugging of FANUC System CNC Machine
    MENG Xiao-Ming, SUN Wei
    . 2013, 26(2):  117. 
    Abstract ( 761 )   PDF (522KB) ( 698 )  
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    The PMC program design and debugging process are introduced with the processing center of the magazine as a platform.The operation and debugging process of the hat type chopper FANUS system are discussed from three aspects:the switch axis emergency stop signal,unloading the armed gang status indicator debugging and rotation axis position detection debugging.It is pointed out that PMC for CNC machine tools improve the work efficiency with good stability and easy debugging.

    Design of Soil Moisture and Temperature Real-time Monitoring System Based on GPRS
    LI Xue-Liang, LIU Yun-Fei, GUO Cheng, GU Min-Ming
    . 2013, 26(2):  120. 
    Abstract ( 1040 )   PDF (863KB) ( 800 )  
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    This article presents a soil temperature sampling system based on the GPRS and an environment survey plan based on the wireless sensor network.The wireless sensor network consists of a large number of wireless sensor nodes which are randomly distributed.All theses nodes are connected with each other by wireless communication technology,capable of data sampling,processing,wireless communication and auto network connection.Telosb platform is used to complete the design of the hardware structure of the sensor nodes and the software design is completed on the TinyOS.The whole system can solve the humidity and temperature sampling problems for the target zone,realizing both the single and muti-hop data transfer meanwhile the long term dynamic surveillance can be also realized by efficient and reliable GPRS long range transmission.

    Automatic Control System for the Industrial Steam Boiler
    LU Li-Juan
    . 2013, 26(2):  123. 
    Abstract ( 1244 )   PDF (708KB) ( 883 )  
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    Boiler microcomputer control is a new technology developed in recent years,which combines the technologies of micro-computer software,hardware,auto-control and boiler energy saving.Computer and frequency conversion automatic control technology is employed to control the main parameters of the production process of the boiler to realize safe operation,energy saving,and emissions reduction.

    Design of a Fiber Laser Power Control System
    DING Yu, LI Zhong-Yin, CAI Qi-Zhong
    . 2013, 26(2):  126. 
    Abstract ( 808 )   PDF (641KB) ( 824 )  
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    A design of fiber lasers power control system is presented with MC9S12XDP512 as the core control combined with peripheral circuits.The resistance of the single-chip microcomputer controls digital potentiometer DS1867 is used to change the switching power supply voltage of the control port,thus realizing the control of power supply current of a fiber laser.The voltage-controlled switch current source PCO-6131 is adopted to change fiber laser output power.The system can also detect the environment temperature with high-temperature alarm and timer control.Test results show that in the application of fiber laser in the marking,stable power output is obtained with temperature detection function,and the whole system is stable and reliable.

    Analysis of Shielding Characteristics of Metal Slab at THz Frequencies Using FDTD Method
    HUANG Bin-Ke, ZHANG Shuang
    . 2013, 26(2):  129. 
    Abstract ( 921 )   PDF (648KB) ( 607 )  
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    Considering the frequency dispersion of the metal conductivity at room temperature and THz frequencies,the shielding effectiveness of one-dimensional metal slab is investigated by the FDTD method.The constitutive equation of the dispersion medium is transformed from frequency domain to time domain by the Z-transform method effectively,which makes it easy to implement the FDTD simulations.The numerical results show that the shielding effectiveness increases with the frequency and oscillate periodically.In addition,the shielding effectiveness is greater than 60 dB for the metal slab with a thickness of hundreds of nanometers.The shielding effectiveness in the unit of dB is increasing linearly with the thickness of metal slab,which has potential applications in thickness measurement for the very thin metal slab.

    An Improved Method of SSH Protocol Host Authentication
    LI Yan-Song, JIANG Guo-Hua
    . 2013, 26(2):  133. 
    Abstract ( 759 )   PDF (727KB) ( 607 )  
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    The secure shell protocol(SSH) is a widely used secure protocol.The paper firstly introduces the architecture of SSH and communication process,and analyzes the standard SSH "Trust-on-First-Use" host authentication mechanism and its defects.The notary server mechanism is adopted for host authentication to improve the safety performance of the protocol.Experiments show that this method is simpler,safer and more effective than the conventional ones.

    Simulation of the Monobit Digital Receiver and its Comparison with the Traditional DFT Receiver
    CHAI Ya-Ru
    . 2013, 26(2):  137. 
    Abstract ( 952 )   PDF (623KB) ( 739 )  
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    This article gives a brief introduction to the principle,structure and components of monobit digital receiver,on the basis of which the mathematical model is presented.At frequency of 1 GHz,the performance of monobit digital receiver is discussed and analyzed.A comparison is made with traditional DFT receivers,which shows that the monobit receiver has better operating efficiency,resolution and performance.

    A Fast Edge Extraction Algorithm for Traffic Visual Detection
    FAN Yu-Qiang, XU Hui, YE Wen
    . 2013, 26(2):  141. 
    Abstract ( 1162 )   PDF (1280KB) ( 579 )  
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    Edge information of vehicles and roads is of importance in traffic visual detection,but traditional edge extraction algorithms cannot meet the intensive computation requirement in traffic visual detection.To this end,a novel fast edge extraction algorithm is presented,by which each image is treated as a unit in calculation thus reducing the computation amount significantly.Experiments show that this algorithm is more effective in traffic visual detection than the traditional ones.

    A Synchronization Technique for Enhanced Interference Cancellation Merge Algorithm
    GENG Cui
    . 2013, 26(2):  144. 
    Abstract ( 814 )   PDF (662KB) ( 592 )  
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    The GSM/EDGE base station is usually equipped with two receiving antennas for merging algorithm to be applied in the scenarios of noise and interference-limited applications,MRC algorithm for the former and the IRC algorithm for the latter.With the cell getting ever smaller and requiring greater capacity,the co-channel interference becomes the major factor to inhibit the capacity.Especially in the typical urban scenarios,base stations need to be equipped with the performance enhancements interference cancellation merging technology of EIRC.Due to its substantial increase in gain relative to the IRC,the synchronization accuracy suitable for IRC and MRC will restrict the use of EIRC.The greater sensitivity of EIRC to the time partial requires a high-precision synchronization algorithm.The new synchronization algorithm proposed for 8PSK PS business can solve this problem.

    Research on and Implementation of Parallel Ant Colony Algorithm Based on MapReduce
    XIA Wei-Lei, WANG Li-Song
    . 2013, 26(2):  146. 
    Abstract ( 1107 )   PDF (674KB) ( 765 )  
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    As ant colony algorithm is time consuming in dealing with large-scale TSP problems,a parallel optimization algorithm based on MapReduce programming mode is proposed,which improves the loop and loop assignment part with the most time-consuming by MapReduce parallel optimization technique.Simultaneously,it takes advantage of PC integration environment to assign small ant colony with certain scale to corresponding PC machine and to make it execute in parallel as well as reduce its running time.Experiments show that the operation time of the improved parallel ant colony algorithm dealing with large data sets is significantly reduced and execution efficiency is significantly improved.

    The Design and Application of Communication Protocol In Vehicle Detection System
    JIANG Xin-Xin
    . 2013, 26(2):  150. 
    Abstract ( 887 )   PDF (614KB) ( 624 )  
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    The detection mode and specific communication protocol between the master part and extension part in-vehicle are presented according to the design of the system.The master part controls ultrasonic transmitter to send out continually the checking number and makes the vehicles queue orderly,therefor solves the“anti-collision”problem of many vehicles.Then the master part aims at the vehicle that has the fixed serial number to verify vehicle inherent information,with short distance radio frequency transceiver for data transmission,then identifies and detects the vehicles.The method is hardly influenced by environment and can identify the vehicle information correctly.

    Research on and Application of Peak Distortion Analysis Algorithm
    LIU Yuan
    . 2013, 26(2):  152. 
    Abstract ( 841 )   PDF (743KB) ( 557 )  
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    The Peak Distortion Analysis(PDA) algorithm proposed by Casper is presented in this paper which accurately calculates the worst-case eye diagram and input bitpatterns for chip-to-chip signaling systems.In order to solve the problems that the worst-case eye diagram for many high-speed chip-to-chip communication systems can not accurately characterized by a small set of random input data,and that the simulation time of a very large set of random data is prohibitive,the algorithm is applied to the CMD condition of DDR3.Application shows the superiority of PDA algorithm in the solution of the two problems.

    Application of an Improved LCMV Aalgorithm in GPS Anti-jamming
    YE Jian-Jie
    . 2013, 26(2):  156. 
    Abstract ( 933 )   PDF (494KB) ( 634 )  
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    An adaptive beamforming algorithm based on LCMV algorithm is studied in this paper.Combined with the feature of the GPS satellite signal,this algorithm is applied in anti-jamming system of GPS receiver.The adaptive algorithm is derived in detail,and the simulation models of these two algorithms are constructed in MATLAB.The results show that the proposed adaptive algorithm can retain the desired GPS signal while suppressing the interference signal.

    Product Data Lightweight Access Technology and its Implementation
    WEN Xiao, GU Qing-Fan
    . 2013, 26(2):  159. 
    Abstract ( 788 )   PDF (765KB) ( 583 )  
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    With the development of intelligent terminal technology,more and more data need to be accessed on mobile terminals.Lightweight product data processing is generally needed for better user experience.This article discusses the lightweight technical processing of computer-aided design drawings in DWF format.Based on the analysis of the DWG format and SWF files,DWG is converted into SWF format,which is suitable for network streaming.And the existing SWF browser is extended based on Flex and Action Script technology with SWF file online editing function.The components are successfully used in the product data lightweight access system,which verifies the feasibility of the proposal.

    Development of and Research on Simulation Training System Based on Industrial Control Software
    LIU Ran-Ran, ZHENG En-Xin, MA Qing-Gong
    . 2013, 26(2):  162. 
    Abstract ( 742 )   PDF (613KB) ( 608 )  
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    This paper describes the development process of a chemical plant process flow simulation training system.This training system uses the PC network to simulate the dynamic process of chemical production and the TDC3000 type DCS (Distributed Control) system,along with live analog functions and teacher control.This system can train on-site process operators,configuration engineers and instrumentation technology workers to improve their theoretical understanding and practical skills.The design and implementation of the system are given covering the overall structure,hardware and software design,and system features and functions.

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