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Table of Content

15 July 2013 Volume 26 Issue 7
  
    Articles
    Improved Algorithm for 3D Clipping and Its Hardware Design
    DENG Huizi,HAN Jungang,MA Chao,YANG Ting,ZHA Li
    . 2013, 26(7):  1. 
    Abstract ( 1037 )   PDF (831KB) ( 860 )  
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    In view of the redundant operations of the three-dimensional clipping by classical algorithm in graphics processor unit and the unnecessary calculation in bilinear interpolation,the article proposes an advanced clipping algorithm,which uses the geometric relationship between the polygon and the vertex inside to calculate the coefficient of the coordinates,and then interpolate the attributes of the point.The simulation results show that the advanced clipping algorithm can reduce the amount of calculation and improve the efficiency of the hardware circuit.

    Research on Sampling Coverage of Parameter Calibration for PCMM
    LIU Fei,YU Liandong
    . 2013, 26(7):  4. 
    Abstract ( 1003 )   PDF (512KB) ( 759 )  
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    The nonlinear least squares method is used as the superior algorithm in PCMM calibration process.The concept of sampling coverage is proposed in the paper to assess the adequacy of sampling data.The angular range and the sampling angle are the necessary factors to obtain the sampling coverage of each joint.The value of the affecting factor of each joint angle respected to the final measurement accuracy is calculated by simulation experiments firstly.Joint 1 and joint 2 with the biggest weights are found out and compared with experiments,which show that better sampling coverage leads to fuller sampling with more accurate measuring results.

    Keywords Extraction for Technology Project Application
    LUO Hao,XU Xiaoliang,LU Yuehua
    . 2013, 26(7):  7. 
    Abstract ( 1165 )   PDF (635KB) ( 747 )  
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    Keywords extraction is very important for the text similarity computing.By the traditional keywords extraction algorithm,the unknown words in the text are ignored and word semantics concept is lacking.In this paper,an extraction algorithm based on unknown words recognition and semantic is proposed for technology project applications.The algorithm integrates Lucene and statistics method for word segmentation and unknown words recognition,and a part of keywords are achieved.Then,the other keywords of applications are extracted by constructing the word semantic similarity network which based on Social Network and calculating the associated degrees of words.Experimental results show that compared with the traditional keyword extraction algorithm,the proposed algorithm can extract more accurate keywords,and it provides a better result of checking on the similarity of technology projects.

    Roundness Error Algorithm Implementation Based on LabVIEW
    RAN Zilong
    . 2013, 26(7):  11. 
    Abstract ( 1090 )   PDF (529KB) ( 920 )  
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    In this paper,the roundness error estimation algorithm is study,and a LabVIEW-based iterative optimization method is designed for minimum area circle and maximum inscribed circle,The algorithm uses the least squares circle center as the initial center of the circle and combines Center Best Mobile cross-string method and the triangle law in order to get the best ideal center of the circle.Implemented with LabVIEW,this algorithm improves test accuracy and speed.

    System of Panoramic Iamge Collection and Remote Transmission Based on FPGA
    ZHANG Zhongmin,NIU Gongxi
    . 2013, 26(7):  11. 
    Abstract ( 985 )   PDF (888KB) ( 1168 )  
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    According to the characteristics of video collection and transmission technology,this paper introduces a system of high-speed panoramic image acquisition and network transmission.The panoramic image platform consists of the curved mirror and the CSC12M25BMP19 CCD Camera.The system collects serial-parallel conversion image data converted by DS90CR288A chip based on Camera Link interface,and MDR 26 is used as the connector.FPGA chip as the core controller dominates the reception,caching and Internet transmission of high speed video data,and the network chip 88E1111 transmits the video data to Network server.Two modules are written in Quartus II development environment,which are the control unit of image acquisition and the underlying driver of Network controller.The paper illustrates the design process of the data acquisition unit and Internet transmission unit.Experimental results indicate that the system can realize the function of high-speed panoramic image acquisition and network transmission,and the image quality is good.

    A Modified Variable Step Size LMS Algorithm Based on Error Correlation Function
    WANG Chonghui,ZOU Kun
    . 2013, 26(7):  14. 
    Abstract ( 909 )   PDF (833KB) ( 777 )  
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    In order to solve the contradictory effect between convergence speed and excess mean square error of the Least Mean Square (LMS) algorithm,some variable step size (VSS) LMS algorithms are proposed.Among these algorithms,the E-LMS algorithm associates the step size with mean square error while the R-LMS algorithm associates the step size with error correlation function.The E-LMS algorithm has poor performance under low signal noise ratio (SNR) condition,and R-LMS algorithm has poor tracking performance for burst systems.In this paper,a modified algorithm based on error correlation function is proposed,whose tracking performance is enhanced by the mean square error.The computer simulation results show that the algorithm has good performance of anti-noise and tracking.

    An improved Algorithm for Interrupt Handling of SCM Microcontroller
    WANG Ting,WANG Lijuan
    . 2013, 26(7):  17. 
    Abstract ( 881 )   PDF (606KB) ( 1001 )  
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    This paper analyses the shortcomings and the problem of the interrupt handling algorithm of SCM with the control circuit using LPC2132 SCM (single chip microcomputer) as MCU as an example.An improved algorithm is proposed to solve the shortcomings,which provides reference for the design of interrupt handling algorithm of SCM.

    An OFDM Timing Synchronization Algorithm Based on the Training Sequence
    SHI Mingyu
    . 2013, 26(7):  21. 
    Abstract ( 860 )   PDF (605KB) ( 694 )  
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    As for the high sensitivity to timing position of the OFDM (orthogonal frequency division multiplexing) system,this paper designs a new training sequence,based on which a new OFDM synchronization algorithm is proposed with in mind the multiple antenna and the multipath problems in wireless communication.Simulation shows that the proposed algorithm eliminates the Schmidl algorithm timing platform,and in the multiple antennas and the multipath channels it also has very good performance.

    Research on Dynamic Bandwidth Allocation Algorithm in OFDM-PON System
    ZHAO Peng,XU Wei,FAN Yaqin
    . 2013, 26(7):  24. 
    Abstract ( 959 )   PDF (794KB) ( 723 )  
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    Orthogonal frequency division multiplexing (OFDM) is a modulation technique which is now used in most new and emerging broadband wired and wireless communication systems because it is an effective solution to inter symbol interference caused by a dispersive channel.Very recently a number of researchers have shown that OFDM is also a promising technology for passive optical network.The transmission performance of the OFDM-PON system and its dynamic bandwidth allocation algorithm are studied in this paper.The improved algorithm is put forward based on the traditional CP algorithm,achieving upstream bandwidth allocation performance of OFDM-PON system.Modeling and simulating show that both system upstream traffic delay and link utilization are improved.

    Method for Optimizing Layout Based on Image Processing
    NING Pan,WANG Junping,ZHANG Guangyan,CAO Honghua,LI Jin,LI Changjiang,LI Bo
    . 2013, 26(7):  29. 
    Abstract ( 1215 )   PDF (687KB) ( 773 )  
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    In this paper,a method for optimizing layout based on image processing is proposed to improve the yield.The two waited-optimization nets and their movable space are first determined.Then the optimal location of removing waited-optimization net in movable space is separately found out.The waited-optimization net is used as the removing net to optimize layout this time that the maximum critical area is reduced through removing the waited-optimization net.Not only is the true contour and particle size distribution of defects considered in the method,it is also not constrained by the shape of nets on the layout,which provides a more accurate basis for optimizing layout.

    Application of the Vibration Fiber Optic Perimeter Alarm System Based on the GPRS in the Underwater Security
    CHEN Qiwei
    . 2013, 26(7):  33. 
    Abstract ( 1098 )   PDF (980KB) ( 627 )  
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    The article describes the composition and the principles of the Vibration fiber optic perimeter alarm system,And on this basis,a vibration cable perimeter alarm system based on GPRS technology is designed,which use the GPRS short message function to realize the function of wireless remote alarm.The design and applications of the GPRS module is described in detail.Different alarm modes are chosen according to the actual environment,and owing to its wireless transmission feature,the system is easy to implement.This alarm system has been successfully applied in the Guangzhou Asian Games underwater security project,receiving warm welcome of the customers for its high reliability and low miss probability and false-alarm rate.

    Application of RS Cascading CRC in the Telemetry System
    ZHU Dangjie,SUN Jianghui,JIANG Xuedong
    . 2013, 26(7):  40. 
    Abstract ( 922 )   PDF (511KB) ( 756 )  
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    Based on the air-to-air missile telemetry system characteristics,the RS code cascade CRC code is selected as the channel coding of the telemetry system.A brief introduction is given to the two coding theories,and the design methods and implementation results of the telemetry system RS cascade CRC code.The experiments show that RS and CRC concatenated coding at the sending end of the telemetry system helps improve the reliability of telemetry data,and the data error correction capability has been strengthened while the efficiency of real-time decoding of the receiving end software is substantially increased.

    Agile Software Development Research and Practice
    QI Shansong
    . 2013, 26(7):  43. 
    Abstract ( 954 )   PDF (861KB) ( 876 )  
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    In order to shorten the product development cycle and focus on customer value,software development requires “agility”.Based on the traditional software development model problems,this paper discusses agile theory and practice in various software and development frameworks and summarizes the concept of agility.

    Measurement System of Physical Dimensions of Steel Plate Based on Array CCD
    GUO Wei,YANG Mu,WANG Qingshi,LI Xintao,LI Yugui
    . 2013, 26(7):  47. 
    Abstract ( 1111 )   PDF (860KB) ( 898 )  
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    In this paper,a plate size automatic testing and analysis system is established by using the array CCD and computer digital technology.The key technologies of image acquisition,matching,and edge acquisition are elaborated in the system.Experimental results show that the system is practical,easy to operate with high precision.The detection accuracy is better than 0.05 mm,which meets the needs of modern industrial inspection.

    PID-Type Sliding-Mode Controller for Boost Converter
    GUO Chen
    . 2013, 26(7):  51. 
    Abstract ( 921 )   PDF (688KB) ( 905 )  
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    For achieving good static and dynamic control characteristics,the PID-type sliding mode control strategy of Boost converter is studied in this paper.The voltage control state expression is given and the system model of Boost converter adopting PID-type sliding mode control is established.The function form of sliding mode surface is designed and the equivalent control expression of system is deduced.The smooth function method is adopted to reduce the chattering phenomenon,and the control expression with chattering elimination measure is presented.The selection method of sliding mode surface parameter is given.The simulation and experiment results validate that the Boost converter system adopting PID-type sliding mode control has good start-up and disturbance regulation characteristics.

    Speckle Noise Suppression of SAR Images Based on CxImage Libraries
    CHEN Haihua,ZHANG Liang,CHEN Peng
    . 2013, 26(7):  54. 
    Abstract ( 1300 )   PDF (1023KB) ( 894 )  
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    The Speckle noise suppression for Synthetic Aperture Radar (SAR) images is an important part in the SAR image information processing.The traditional Speckle denoise algorithm is integrated in a processing module.But the codes of the software are encapsulated so that it affects the secondary development.In this paper,an integrational application method for spatial self-adapting filtering based on CxImage open source image library is proposed.CxImage image library is linked into the MFC application framework,and then its powerful image management,maintenance,processing functions are used to maintain and manage the SAR images.the classic space-domain self-adapting filtering methods are further integrated to do the speckle noise filtering of ERS-2 PRI SAR images.the appropriate evaluation parameters of filtering effect are selected,and the filtering results are compared,and finally the pros and cons of each filtering algorithm applied to SAR image filtering are concluded.

    Intelligent Embedded Network Monitoring System Based on ARM and Linux
    LIAO Jianshang,CHEN Yimin,CAO Chengtao
    . 2013, 26(7):  59. 
    Abstract ( 1275 )   PDF (858KB) ( 886 )  
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    This paper describes the current development status of smart home,and analyses the inadequacy of smart home,advances a solution of ARM and Linux-based smart home network monitoring system with the design of system functions,including design of linux device driver and CGI-based application.System remote testing is also realized to show the monitoring results of smart home control system for the purposes of smart home monitoring.

    Multi-tenant MultiInstance SaaS Platform Based on Openstack
    WANG You,WEN Yanqi,NING Chengeng,PEI Qingqi
    . 2013, 26(7):  63. 
    Abstract ( 945 )   PDF (769KB) ( 847 )  
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    SaaS (Software as a Service) will become the mainstream of future Software industry management pattern,and the Interactive speed and performance of SaaS platform can directly affect the quality of SaaS Service.By Analyzing the SaaS pattern,an SaaS platform of Multi-tenant MultiInstance is built based on OpenStack.With hierarchical architecture,the platform can break software instance limitations,thus an excellent scalability.Unlimited extension is possible with one setup and there is no need to change the architecture.The interface mapping is adopted to interact for faster response.Compared with the existing SaaS products,our platform have better service scalability and user experience.

    ICM and Its Application in Image Enhancement
    YANG Zhongbin,L Mingzhao,HU Baolei
    . 2013, 26(7):  67. 
    Abstract ( 982 )   PDF (1194KB) ( 764 )  
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    An improved continuous ignition intersecting cortical model is presented,which is applied in image enhancement.The new model makes use of the ignition threshold neuron behavior of long-term memory capacity as their feedback combined with external excitation neurons to decide the status value;the threshold attenuation factor is replaced by the transformation of the function,thus a flexibility to select the appropriate attenuation function depending on the applications;the interpretation of the neighborhood is added in the ignition threshold neurons enhancement in order to determine whether the corresponding threshold sudden changes occur,and to realize continuous ignition of the neurons.On this basis,the histogram equalization method is put forward based on FC_ICM in contrast to CLAHE and ICM image enhancement methods.Experimental results show that our method can effectively enhance the global and local contrast and effectively suppress noise.

    CAN Protocol Frame Processing Design of the Driving System of Vehicle Network
    MA Fuping,CHEN Yifeng
    . 2013, 26(7):  72. 
    Abstract ( 1023 )   PDF (391KB) ( 738 )  
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    The CAN protocol is a network system for transmitting information in a transmission mode.The realization of CAN protocol frame processing scheme design is of great importance.This paper introduces the CAN protocol function.According to the idea of modular design,the CAN function module of the drive system is designed.Finally,based on the CAN module design,this paper designs the processing flow of CAN protocol frame between the control modules.

    Design and Implementation of Airborne Power Control with Short Circuit Protection Device
    AI Tiezhu,BAI Xi,WANG Yin
    . 2013, 26(7):  74. 
    Abstract ( 1009 )   PDF (543KB) ( 771 )  
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    This paper introduces a power control device with short-circuit protection function.Compared with traditional electromechanical contactors,its control function is achieved by field effect tube.Without mechanical contact,it does not frequently switch contact points during circuits on and off and has no mechanical failure mode,so it has a very high reliability and safety and it is much superior in performance to the traditional control switch.With the short-circuit protection,better protecting load and the airborne power supply circuit,the control device is more reliable.Experiments and practical applications prove that this design has the advantages of simple hardware circuit design,real-time operation,high reliability and a high level of intelligence,and meets the requirements of airborne electronic equipment.

    Design of a New Short Protection Circuit for DC/DC Converters
    YUAN Zheng,XUE Chaoyao,MA Renyue,LU Jing
    . 2013, 26(7):  77. 
    Abstract ( 1073 )   PDF (562KB) ( 945 )  
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    A novel short-circuit protection circuit is proposed with the case in consideration of the shorted load making performance of the DC/DC converter unstable or damaging the converter,effectively avoiding wasting energy of the converter when load is shorted and the output current is very large.The proposed circuit reduces the maximum output current for short circuit by changing the input reference voltage of the current limit comparator.The circuit is designed and applied in a synchronous BUCK DC/DC converter with high voltage based on 0.35 μm BCD process.The simulation results show that the short circuit current of the chip is 30 mA,decreasing output current and conserving energy compared with the traditional protection circuit.

    Application of Hi-resolution Frequency Synthesizer in Airborne Electronic Equipment
    ZHOU Bingli,ZHANG Erjian
    . 2013, 26(7):  80. 
    Abstract ( 953 )   PDF (543KB) ( 895 )  
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    Along with the development of navigation technology,the electronic equipment requires higher frequency stability,spectrum purity and frequency resolution of frequency source.Besides low noise and high stability,the frequency source shall have high frequency resolution.This article describes a method for realizing a high frequency resolution and low noise frequency synthesizer,which is a good reference for the design of C-band high frequency resolution frequency synthesizer.

    Design of a Bandgap Voltage with Two-way Trimming Circuit
    HUANG Chong,OU Jian,YUAN Zheng,XUE Chaoyao
    . 2013, 26(7):  82. 
    Abstract ( 989 )   PDF (512KB) ( 859 )  
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    A new two-way trimming circuit for CMOS bandgap reference is presented in this paper.With the sample and practical trimming method to achieve high-precision adjustment,the proposed method utilizing sink and source current to actualize fine and coarse adjustment,and not affect the temperature characteristic of the bandgap.Consequently,the purpose of adjusting the reference voltage accuracy is realized.

    Design of FPGA-based PCI Bus Data Acquisition
    WANG Lina,YAN Dawei
    . 2013, 26(7):  85. 
    Abstract ( 1302 )   PDF (411KB) ( 735 )  
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    This paper focuses on the design of FPGA-based PCI bus data acquisition.The board has realized reading data by means of enquiries,interrupt and DMA.It not only acquires real-time data,but also achieves high-capacity data cache,which can effectively meet the requirements of high-speed data acquisition and transmission.As a result of the utilization of FPGA,the product development cycle is shortened.The design can also be modified and upgrade online.

    The Multiplier Module Compact UQPSK Modulation Based on Multi-chip Assembly
    LIU Xing,ZHANG Qiang,WANG Zhiqiang,WU Jingfeng
    . 2013, 26(7):  87. 
    Abstract ( 997 )   PDF (763KB) ( 796 )  
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    This paper describes the high carrier isolation of the S band UQPSK modulation and frequency multiplier module design technology.The UQPSK modulation circuit design process is described,and an analysis of the key factors that affect the final performance is made.The paper also covers retaining overall performance while simplifying the circuit and reducing the volume and the allocation of the device specification at all levels.The high performance S-band UQPSK modulation and multiplier module is successfully developed.

    A High Power Microwave Multi-modes Horn Antenna
    YUAN Jing,HUA Genrui,GAO Kun
    . 2013, 26(7):  91. 
    Abstract ( 940 )   PDF (651KB) ( 696 )  
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    To meet the needs of the high-power microwave systems of the antenna,the design of an overlay of the 15.9~[JP4]21.8 GHz band multimode horn antenna is proposed and its high power performance is studied.Simulation results show that the horn antenna has an in-band VSWR less than 1.2 and excellent radiation characteristics.E and H patterns has good feed equal at 16.3~20.8 GHz within a range of 20 dB,and breakdown does not appear with a speaker output power up to 526 MW.

    Design and Implementation of the Dual-channel Mixing Audio System
    WU Jiwei
    . 2013, 26(7):  94. 
    Abstract ( 915 )   PDF (757KB) ( 1011 )  
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    The design and implementation of a two-channel input and mono output audio system is presented based on the operational amplifier and power amplifier integrated circuit.The system design process is discussed in detail.Test results show that the system has the characteristics of loud vice,low noise and no distortion with better audio performance.Therefore,it has broad application prospects and practical value.

    Horn Antenna Based on SIW
    ZHANG Zhe,ZHANG Xiaomiao,HUYAN Jangli,LI Yang
    . 2013, 26(7):  97. 
    Abstract ( 953 )   PDF (580KB) ( 863 )  
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    In this paper,a 25 GHz H-plane horn antenna implemented by a substrate integrated waveguide (SIW) is designed.The metal vias are flared in the direction of H-plane.Fed by microstrip-waveguide structure,this antenna has the feature of low profile and high gain.The SIW horn input reflection coefficient and output radiation are simulated by the Ansoft HFSS 12.0,which verifies the feasibility of our design.

    A Study on the Channel Capacity of Multiple Input Multiple Output Systems
    DENG Shuangcheng,WANG Xinmei
    . 2013, 26(7):  99. 
    Abstract ( 1133 )   PDF (622KB) ( 720 )  
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    Multiple Input Multiple Output (MIMO) technique,which can increase the channel capacity and spectral efficiency,has become one of the key techniques of the next generation of wireless communication system.This article first studies the space-time channel models.Based on the singular value decomposition,the MIMO channel is equivalent to independent parallel channel,i.e.with the number of antenna increase,the channel capacity increases linearly.Then the paper discusses in detail the multi-dimensional channel capacity region of MIMO systems in the case of Gaussian multiple-access channels and Gaussian broadcast channels,where the duality of the two channels is emphatically analyzed.

    Design of a Reconfigurable VHF Antenna
    LI Wang,ZHENG Huili,DONG Liang
    . 2013, 26(7):  103. 
    Abstract ( 851 )   PDF (527KB) ( 802 )  
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    A novel VHF monopole antenna is introduced in this paper.By using the reconfigurable and broadband matching technology,the lateral size of the antenna is largely decreased compared with that of the traditional sleeve antenna.Simulation results show that the VSWR of this antenna is less than 2 across the operation band and has good radiation characteristics.

    Self-test and Auto-switching Dual Adjustable Power Supply Module
    MAO Guohua,XUE Changsheng,WANG Bo
    . 2013, 26(7):  105. 
    Abstract ( 890 )   PDF (594KB) ( 791 )  
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    This article presents a dual adjustable power module design capable of self-test and automatic switch for aviation technology,and its application and working conditions are introduced.The circuit,working principles key components selection and structural design requirements are analyzed.Solutions are given to the difficult technical problems and appearance structure.Experiments show that the product can be used in aircraft cabin lamp power control system with the advantages of easy cooling,easy installation,stable and reliable output,and standard terminal specifications.And the grid filter has good anti-electromagnetic radiation interference performance,and each output is closed-loop voltage controlled,thus the output stability and ease operation.

    Intelligent Regulated Power Supply Design Based on At89c51
    JIANG Tianliang
    . 2013, 26(7):  108. 
    Abstract ( 972 )   PDF (493KB) ( 755 )  
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    This paper introduces a single-chip microcomputer-based intelligent power supply design,which uses the MCU to control digital-to-analog converters to change the voltage regulator module subsequent output.The system consists of rectifier filter preliminary regulator of the MCU control of the DAC and display components.The power supply has continuously adjustable stepping with real-time display,overcoming the shortcomings of traditional voltage regulator power supply.

    Design of High-Power UHF Front-End
    YOU Liren,BIAN Guohui,MA Zhangang
    . 2013, 26(7):  112. 
    Abstract ( 853 )   PDF (825KB) ( 1107 )  
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    An important wireless transceiver circuit,the RF transceiver front-end circuit plays a decisive role in overall system noise figure,dynamic range and other key indicators The article makes a detailed analysis of the importance of the RF front-end circuit in a wireless communication system,including the the composition of the RF transceiver front-end,the working principle,and the key points and difficulties in receiver and transmitter design.An optimized design of the key technical indicators is proposed,and a simple UHF high-power RF transceiver front-end design with fast circuit control is presented,which is tested and improved.The results show that the noise figure is up to 3.2 dB And the receiver channel gain is up to 30 dB with a transmit channel output power≥40 dBm and a third-order intermodulation≤-18 dBc.The test results are analyzed,and some improvements on the design are proposed.

    Hardware and Software Design and Implementation of the Airborne Computer RS422A Communications
    WANG Mei,WANG Lingwei,JI Jin
    . 2013, 26(7):  116. 
    Abstract ( 816 )   PDF (527KB) ( 824 )  
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    RS422A and RS485 asynchronous serial communication technologies are widely used real-time control of the onboard computer system to improve the maintainability and scalability of the aircraft.Its stable operation requires both reliable hardware platform and software algorithms.This paper describes an onboard computer to achieve asynchronous serial communication with multiple devices in real time,and designs a unified hardware platform and software algorithms based on different communication protocols for each device with emphasis on the software design and principle.Products developed under the principle have been tested,united tested and put into practical uses,and prove to be reliable and good in performance.

    Effect of Interface Timing Belt on the Digital Intermediate Frequency Transmitter
    ZHENG Xiuyun
    . 2013, 26(7):  119. 
    Abstract ( 948 )   PDF (833KB) ( 1335 )  
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    With the AD9142 GSM wireless communication transmitter applications as examples,this article discusses the impact of sideband signals on system performance with emphasis on the theoretical analysis of the causes of interface timing errors and their contribution to the sideband signal.Improvement methods are proposed and a comparison of data before and after timing optimization is given.In order to ensure optimal performance of the DAC output,the interface timing must meet the setup and hold time requirements,which can be achieved by adjusting the baseband side of the delay.

    Environmental Impact of Offshore Oil Platforms Scattering Communication Station Electromagnetic Radiation
    FENG Chenggong
    . 2013, 26(7):  122. 
    Abstract ( 1029 )   PDF (603KB) ( 967 )  
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    Due to electromagnetic radiation on human health,the construction of scatter communication stations on small reefs or offshore oil platforms arouses environmental protection concerns.This paper presents an analysis of electromagnetic radiation power density measurement of the scattered communication station Wenchang oilfields offshore oil platforms,which proves that the impact of the communication station scattering of electromagnetic radiation on the entire platform meets environmental requirements.

    Range-Velocity Decoupling Based on Dual Period Sawtooth Wave LFMCW Radar
    ZHENG Yuan,WEN Bo,MA Ruiping
    . 2013, 26(7):  125. 
    Abstract ( 1258 )   PDF (863KB) ( 638 )  
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    Dual period sawtooth and moving target detection (MTD) techniques are combined in order to realize the range-velocity coupling of LFMCW radar.As for the problem of multi-target pairing,a new method called coupled range pairing is proposed.After eliminating the velocity ambiguity of pairing targets,the motion parameters can be acquired.The simulation results indicate the effectiveness of the signal process and pairing algorithm.

    A Solution to Marine Surveillance Radar
    WU Xiafei,WANG Shengguo,ZHANG Yubing
    . 2013, 26(7):  129. 
    Abstract ( 1141 )   PDF (892KB) ( 1052 )  
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    The application requirements of marine surveillance radar for counter-smuggling are summarized in this paper.The operating frequency,data rate,and a solution to the transmitter,receiver and antenna & feed subsystem are discussed.Some decisive factors,such as correlation and intensity of sea clutter,are analyzed.An applicable approach to clutter suppression for this radar is proposed and validated with simulation of S/C.

    The Design of Battery Monitoring System Based on Qt
    ZHAO Jingjing,ZHOU Manman,ZHOU Jiemin
    . 2013, 26(7):  134. 
    Abstract ( 987 )   PDF (601KB) ( 579 )  
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    Battery is indispensable to any Uninterruptible Power Supply system.The article presents a hardware circuit which uses S3C2440 as the core to build the battery monitoring system,and introduces the design methods and processes of Qt-based GUI.Practical tests show that this design is reliable and versatile,providing valuable references for battery monitoring.

    Application of Kirchhoff's Voltage Law in Circuit Analysis
    LI Wenjing,AN Gongchang
    . 2013, 26(7):  136. 
    Abstract ( 1199 )   PDF (501KB) ( 588 )  
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    The Kirchhoff's voltage law is applied in the analysis of various types of circuits,including direct current circuit,sinusoidal alternating circuit,amplifying circuit specific circuit,Its applications are described in listing of the circuit voltage equation,calculating the voltage between any two points,and finding circuit opening voltage,and calculating the potential at a certain point of the circuit.And Kirchhoff's voltage law finds wider uses.

    The Rapid Detection of Semen Quality Based on Quartz Crystal Microbalance
    LI Qiang,LI Ben
    . 2013, 26(7):  139. 
    Abstract ( 865 )   PDF (651KB) ( 473 )  
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    Whereas artificial insemination has arguably been the most important management tool leading to improved herd productivity,the study has been focused on the technique of cryopreservation of boar semen.A viable cryopreservation semen sample is judged by the total number of spermatozoa (sperm) in the sample and the motility of the sperm.According to the rapid detection of semen quality,a low cost and reusable system for screening semen samples based on the Quartz Crystal Microbalance (QCM) and Universal Frequency to Digital Converter (UFDC-1) is designed.Data is presented that caused by the same porcine semen samples using the system and a commercial frequency counter.The results show that it can offers a low-cost sensor system suitable for screening a semen sample at the point of use on a farm.

    Design of an NAND Flash Controller Test Bench
    WEI Guo
    . 2013, 26(7):  142. 
    Abstract ( 889 )   PDF (651KB) ( 748 )  
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    The article discusses the design theory,functional and structural of the test bench for an NAND Flash memory controller.The hardware description language is used to build a self-check test bench to perform a comprehensive functional verification process for the controller.Simulation results verify the correctness of this design,which can improve the verification efficiency and shorten the development cycle.

    Configuration Design of X-type Avionics Modularv
    Lv Jingfeng,QUAN Zhengning
    . 2013, 26(7):  144. 
    Abstract ( 1000 )   PDF (675KB) ( 744 )  
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    An X-type avionics modular configuration design is described.Current avionics modules are ever smaller in size and weight under increasingly complex conditions,which requires more on the designs of heat,vibration strike,EMC,and environmental adaptability,etc.Environmental test shows that the modular configuration design can meet the requirements of the system performance.

    The Design of Fiber-Optic Communication Module Based on C8051F410 SCM
    SUN Lei,LIN Feng,YANG Pengyi
    . 2013, 26(7):  147. 
    Abstract ( 1220 )   PDF (710KB) ( 876 )  
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    Fiber-optic communication plays a significant role in the field of modern communication for its wide bandwidth,low SNR (signal-to-noise ration) and good anti-jamming performance.We choose C8051F410 SCM (single chip microcomputer) as the microprocessor and combine with other peripheral circuits to design a type of optical fiber transmission module,including the whole structure of this type of optical fiber transmission,hardware circuit building,software design and development,and experimental data recording.The module has the advantages of small size,high precision,easy operation,and high practical value.

    Design of Data Unit Multiplexing and Mapping in Optical Transport Network
    CAI Long,TIAN Xiaoping,ZHU Qian
    . 2013, 26(7):  151. 
    Abstract ( 759 )   PDF (668KB) ( 766 )  
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    In order to simplify the clock circuit design of optical data unit in optical transport network and reduce costs,a synchronization circuit based on uniform gap clock is proposed.First,the generation of gap synchronous clock is achieved by using the asynchronous FIFO;then a multiplexing and mapping circuit using the synchronous clock with a notch is designed to handle different types of optical data unit,to achieve the absorption of the signal frequency offset,clock data recovery,and forward error correction.The proof by circuit simulation shows the program can achieve the same performance as traditional programs,but the design and implementation of the circuit are simple and economical by using a virtual clock instead of phase-locked loop.

    The Effects of W-85Cu Heat Sinks on Pressing Properties
    LIU Yongwang,JIANG Guosheng,WANG Zhifa,WU Hong
    . 2013, 26(7):  154. 
    Abstract ( 662 )   PDF (650KB) ( 538 )  
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    W-85Cu heat sinks are prepared by using electroless plating copper film on the surface of tungsten powder.The effects of the content of the electroless plating copper film on the properties of pressing properties are researched.The results show that the electroless copper film can improve the pressing properties of tungsten powder and the pressing pressure of the same density samples increases with the content of electroless plating copper.

    Three-dimensional Interconnection Technology Based on High Temperature Co-fired Ceramics Substrate
    YU Lei,JIE Hai,WANG Anlao
    . 2013, 26(7):  157. 
    Abstract ( 725 )   PDF (827KB) ( 626 )  
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    Multi-layer substrate based on high temperature co-fired ceramics (HTCC) technology is a realistic way to realize microwave modules with miniature size,light weight and high reliability.In this paper,three-dimensional interconnection structures based on HTCC substrate are discussed,including vertical transition in and between the substrate.By means of simulation and optimization,the presented test results show that the structures proposed in the paper can be well used in the design of modules.

    A Laser Signal Sample and Hold Circuit Analysis
    WANG Jinchan
    . 2013, 26(7):  160. 
    Abstract ( 732 )   PDF (1088KB) ( 644 )  
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    The classic positive peak hold circuits are not suitable for high-speed acquisition due to narrow band,low conversion rate,poor linearity,and high droop rate,.This article proposes an improved thick film integrated laser signal hold circuit.According to the technical requirements,a closed loop is added with user assistance to charge and discharge the capacitor to achieve positive peak hold indicator.Simulation verifies the circuit design principles of modularity and its high reliability.

    Design of Light Source Temperature Controller for Optical Glass Type Current Transformer
    WANG Chi,CHEN Yaoming,ZHANG Xiuying,WANG Shudong
    . 2013, 26(7):  164. 
    Abstract ( 976 )   PDF (631KB) ( 522 )  
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    The working principles of the optical glass the ECT light source temperature controller (hereinafter referred to as the thermostat) are introduced.With regard to the special requirements for light source intensity output and its center wavelength stability of optical glass ECT,the superimposed pulse fine adjustment of the light source based on high-power voltage regulator temperature control is proposed.The hardware circuit is given.The test results show that the optical glass the ECT light source temperature can be controlled at +25 ± 0.1 ℃ within the range of -40 ℃~+70 ℃,which proves the feasibility of the temperature control.

    The Hardware Design of an Intelligent-Searching Track Car Based on Laser Diode
    WEN Cong,LAN Tuqing
    . 2013, 26(7):  168. 
    Abstract ( 800 )   PDF (981KB) ( 656 )  
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    This article particularly introduces a design method of the hardware system for an intelligent-searching track car based on infrared laser diode.The system uses MC9S12XS128 as the control core,employs infrared laser diodes and infrared receiving sensors to acquire path information,adopts the internal integrated H-bridge circuit MC33886 chip to realize motor drive,and uses a LM331 chip to design the speed measuring circuit.In order to achieve the automatic tracking function,this system can analyze and process the data of the collected path and the feedback of speed,promptly steer the servo,and adjust the motor speed.

    The Implementation of DES Algorithm Based on FPGA
    GE Yong,LI Hua,NING Yongcheng
    . 2013, 26(7):  172. 
    Abstract ( 911 )   PDF (1038KB) ( 523 )  
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    Based on the principle of DES algorithm and the method of pipeline design and time division multiplexing design,the paper introduces two different ways to implement the algorithm with Xilinx FPGA using respective methods.A detail analysis of the running speed and hardware resource cost between the designs is made.The fastest implementation of the design can achieve a highest clock frequency of 139MHz and an encryption rate of 8.9 Gbit·s-1.

    The PN Code Rapid Acquisition Algorithm Analysis and Simulation
    SHI Jufeng,TONG Yan,LIU Miaohui
    . 2013, 26(7):  177. 
    Abstract ( 816 )   PDF (553KB) ( 470 )  
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    With the ever higher requirements for data confidentiality in the field of measurement and control,the length of the pseudo-code for spreading selection is also increasing,and the general method of pseudo-yard catch has failed to meet the system real-time requirements.The traditional pseudonoise code acquisition method is discussed with its advantages and disadvantages pointed out.A fast Fourier transform-based pseudo-code in the frequency domain acquisition method is employed to meet the requirements for real-time acquisition of long PN code in the monitoring and control communication system.Simulation results verify the effectiveness of the method.

    Design of MCU Encryption and Authentication System Based on 1-Wire Security Device
    YI Wei,PENG Yiqiang,LUO Senqiao
    . 2013, 26(7):  180. 
    Abstract ( 875 )   PDF (667KB) ( 701 )  
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    In order to prevent illegal copying of microcontroller software,this paper presents a MCU encryption and authentication system based on 1-Wire security device DS28E01-100.The principle and structural of the encryption and authentication system are described,and the MCU programming method of SHA-1 secure hash algorithm block and some functions,such as the writing secrets memory block,writing data memory page block and challenge-response authentication block,are given.The practical application indicates that the system can effectively improve the microcontroller software's capabilities to prevent illegal copying.

    Overview of the Development of China's Internet Infrastructures
    CAO Huihai,LI Yuan
    . 2013, 26(7):  183. 
    Abstract ( 866 )   PDF (564KB) ( 659 )  
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    The construction of Internet infrastructures has direct impact on Internet performance improvements,thereby affecting the implementation of “Broadband China” Project.In this paper,the recent construction and development of China's Internet infrastructure,interconnection bandwidth,international networks and ICP/ISP infrastructure are reviewed and summarized.

    The Realization of C language in the Workers Information Management System
    ZHU Zhengguo
    . 2013, 26(7):  185. 
    Abstract ( 800 )   PDF (383KB) ( 689 )  
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    A C-based information management system for enterprise employees is proposed.The system structure,functions and features are introduced,and the flow chart of the system design and the operation of the display interface are given.This system can significantly improve the efficiency of enterprise management,which becomes more systematic,standardized,and intelligent.

    Application of Web Technology in Electric Power Scheduling Security
    LI Jianping
    . 2013, 26(7):  187. 
    Abstract ( 1002 )   PDF (390KB) ( 607 )  
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    The dispatching safety evaluation and its importance are introduced,the dispatching safety evaluation system is analyzed for a better application of Web technology in eliminating the normal operation problems in the grid scheduling and minimizing the incidence of electrical safety incidents to ensure the normal operation of the power system and personnel safety,reduce economic losses,and achieve optimal security benefits.

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