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Table of Content

15 June 2014 Volume 27 Issue 6
  
    Articles
    EWB Simulation of the Multi-scroll Jerk Chaotic Attractors
    XU Liguo,XU Xiaoyun
    . 2014, 27(6):  1. 
    Abstract ( 722 )   PDF (708KB) ( 722 )  
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    Chaotic attractors are the key to the application of chaotic signals in encryption.Based on dual-scroll chaotic attractors,multi-scroll Jerk chaotic attractors are produced by the use of ladder wave functions.The generation mechanism of multi-scroll Jerk chaotic attractors is analyzed.Simulation circuits of the 6- and 7-scroll chaotic attractors are designed according to the dimensionless state equations.EWB circuit simulation software is used for simulation,and the simulation results are consistent with mathematical analysis,a further confirmation of the existence of the multi-scroll Jerk system.

    Multi-connection Synchronization Algorithm Based on Bayesian Estimation
    LI Ning
    . 2014, 27(6):  5. 
    Abstract ( 542 )   PDF (704KB) ( 607 )  
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    The paper presents a common multi-connection system model in heterogeneous networks.The best traffic splitting rate is computed based on the bootstrap estimation and Bayesian estimation of the network delay,with minimizing the multi-connection failing probability as the optimization objective.The simulation results show that multi-connection can increase the system performance,and synchronization of the sub traffic is well achieved with the use of the best splitting rate.

    A Novel NLOS Error Suppression Algorithm Based on TDOA Wireless Positioning
    WANG Zheng,CHEN Bing
    . 2014, 27(6):  9. 
    Abstract ( 887 )   PDF (758KB) ( 541 )  
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    NLOS (Non Line of Sight) error is a key factor that affects positioning accuracy of various wireless positioning algorithms.In order to decrease NLOS error,this article proposes a NLOS error suppression algorithm based on TDOA (Time Difference of Arrival),which introduces innovation threshold and corrected parameter to improve the iterative process of Kalman filter that effectively restrain NLOS error in TDOA measurements.Simulation results show that the novel algorithm helps improve positioning accuracy and has better performance than traditional NLOS error suppression algorithms.

    Research on Regular Chinese Fragments Reassembly Based on 0-1 Programming Model
    SHEN Hongping,ZHANG Yipeng,WANG Yikang
    . 2014, 27(6):  13. 
    Abstract ( 719 )   PDF (868KB) ( 680 )  
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    By analyzing the fragments on the regular Chinese text distribution,extracting fragments boundary information,defining compatibility of adjacent fragments based on Euclidean distance,and considering the maximum compatibility of all the fragments,the fragment recuperative model is established based on 0-1 programming,and a greedy algorithm is used to simulate a fragmented files.The research results show that the regular Chinese fragments recovered problem can be accurately described with math based on 0-1 programming model,and greedy algorithm combined with appropriate artificial intervention can better solve this problem.

    Realization of Physical Layer of SATAII Based on FPGA
    YE Bohong
    . 2014, 27(6):  17. 
    Abstract ( 812 )   PDF (853KB) ( 977 )  
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    As a high-speed serial and point-to-point transmission hard disk interface,SATA has taken the place of IDE.The SATAII and SATAIII with the average line speed of 3 Gbit·s-1and 6 Gbit·s-1 respectively are widely used in hard disk.This paper makes a comprehensive analysis of the protocol.With the utility of ISE design suit and ML507 evaluation platform of Xilinx Corp,the coding and debugging of the IP core is performed.The mode of the FPGA is XC5VFX70T and the high speed communication is done by using the Rocket IO GTX.The overall speed is improved by using the multi-stage pipeline technology.

    An Interconnection Design for ZigBee and WiFi Based on Gateway
    XU Jiajia,XU Ming
    . 2014, 27(6):  22. 
    Abstract ( 796 )   PDF (869KB) ( 750 )  
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    An interconnection design for ZigBee and WiFi is proposed.This design is based on ConnetPort X4 gateway of Digi corporation.A gateway program is written using Python language for the nodes of ZigBee net to communicate with devices on the WiFi net.The development cycle of this design is short and the application value is high.

    Simulation Analysis of and Experimental Research on Magnetic Field Induced by Large Sparse Solenoids
    HUANG Liuhong,LI Yuebo,YANG Jie,DING Shijing,LIU Feng
    . 2014, 27(6):  26. 
    Abstract ( 851 )   PDF (696KB) ( 550 )  
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    The magnetic field generating coils of the low-frequency magnetic field simulation device are large sparse solenoids,whose magnetic field distribution cannot be calculated using the formulas applicable in the case of dense wing.In order to solve this problem,numerical simulation with ANSYS is used to analyze the magnetic flux density and its uniformity.These results are validated by the experimental data.The conclusions of this research provide a direct basis on which to determine the technical indices of the low frequency magnetic field simulation system and magnetic test space.

    Design of a Low Pass Filter Based on MATLAB GUIDE
    CHANG Wei,CHEN Wei
    . 2014, 27(6):  26. 
    Abstract ( 634 )   PDF (532KB) ( 611 )  
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    UV BVR channel test statistic software with graphical interface display,numerical statistics and results diagram is designed by using Matlab Guide.The design process of Low Pass Filter and Matlab Guide tools is briefly introduced,the software interface of Low Pass Filter design is given,and the operation of the software is exemplified by an application design.

    Analysis and Design of a Novel Anti-vibration Crystal Oscillator
    XU Shuyi,JIA Yingqian,CHEN Zhongping,WANG Zhankui
    . 2014, 27(6):  32. 
    Abstract ( 862 )   PDF (753KB) ( 575 )  
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    The phase noise performance of the crystal oscillator under vibration plays an important role in vehicle and airborne systems.This article discusses the phase noise of crystal oscillator under vibration.A novel anti-vibration crystal oscillator is designed using two crystal resonators to compensate acceleration sensitivity.The testing result shows that the phase noise of the novel anti-vibration crystal oscillator is better than -140 dBc/Hz at 1 kHz offset frequency after compensating acceleration sensitivity,with an improvement of 20 dB.This method is feasible and valid in reducing acceleration sensitivity of the crystal oscillator.

    Design of a Ku-band 80 W Solid-state Power Combining Amplifier
    ZHANG Juan,ZHAN Ting,LIAO Yuan,SONG Zhidong
    . 2014, 27(6):  35. 
    Abstract ( 815 )   PDF (711KB) ( 574 )  
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    This paper describes a Ku-band 80W solid-state power amplifier by using the waveguide bridge and waveguide-to-microstripe double probes transform structure.The waveguide bridge is used to improve the rejection rate between combination channels,and the waveguide-to-microstripe double probes transform structure can increases the integration of modules.Accordingly a higher power output is realized owing to the high dense integration.The pulse output power of this amplifier is 80W at 13.5~14.5 GHz with the corresponding power combining efficiency better than 81% and the power added efficiency greater than 25%.

    Design of a Sampling Clock with Low Phase Noise
    JIANG Xiaoqiang,SHI Yu,SU Angang,ZHAO Baolin
    . 2014, 27(6):  39. 
    Abstract ( 888 )   PDF (769KB) ( 594 )  
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    This paper introduces the theories of phase locked loop and direct digital synthesis,discusses their advantages and disadvantages,and presents the design of a sampling clock with low phase noise using the PLL and DDS technologies.The measurement results show that the phase noise is up to -119 dBc@1 kHz and -116 dBc@100 kHz at 70 MHz.

    Modal and Stress Analysis of Antenna Pedestal in UG
    ZHANG Shouyin,ZHANG Xiang,ZHANG Lin
    . 2014, 27(6):  42. 
    Abstract ( 666 )   PDF (1063KB) ( 686 )  
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    A 3D model of antenna pedestal is obtained in the software of UG to address actual engineering needs.Then after setting boundary condition and the range of frequency,the stress and modal analysis of the model is made in NX Nastran.The results show that the optimized structure increases its inherent resonant frequency and that all mechanical characteristics of the antenna pedestal satisfy the design requirement.

    Research on and Implementation of Reconfigurable FFT IP Core Based on FPGA
    LI Daxi
    . 2014, 27(6):  46. 
    Abstract ( 720 )   PDF (1225KB) ( 657 )  
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    A reconfigurable IP core implemented on FPGA is described.This FFT architecture is based on a butterfly process which employs pipeline architecture and fast parallel multiplier.An implementation of 4k points based on this IP with the reconfigurable points,data width and radix is performed.This IP is realized by Verilog and simulated by ModelSim.It is synthesized by ISE and downloaded to Virtex-5 xc5vfx70t that runs at 200 MHz clock.The experimental result and performance comparison show that it has better capability and speed than exiting reported realizations.

    Implementation of Sweep Signal for Vibrator Based on DSP
    RAO Wei
    . 2014, 27(6):  50. 
    Abstract ( 681 )   PDF (801KB) ( 809 )  
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    For the high-precision signal requirements of vibrator in the seismic exploration,this paper proposes a solution to implement the linear sine sweep DSP-based signal source,including the hardware and software design.The solution not only improves the sweep signal generator's accuracy and waveform stability and reduces the waveform distortion,but also has the advantages of simple operation,reliable and stable working performance.

    Time-domain Channel Estimation Method for OFDM Power Line Communication System
    ZHA Jiajia,SHAO Hanqin,WANG Rongjun
    . 2014, 27(6):  54. 
    Abstract ( 808 )   PDF (618KB) ( 571 )  
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    For the G3-PLC protocol,two improved time-domain channel estimation methods are proposed in this paper.Presetting the maximum-delay of power line channel is used to achieve time-domain noise reduction.However,the corresponding time-frequency transform matrix is rank-deficient,and the LS criterion is not suitable for estimating the time-domain characteristics.To solve the problem,this paper presents a time domain channel estimation method based on modified matrix.And a time-domain LMMSE channel estimation method without channel statistics is proposed to reduce the complexity of the algorithm.The simulation results show that both the modified LS algorithm and the simplified LMMSE algorithm have good performance.

    Design of Encrypted Recorder Based on STM32
    YANG Chuanchuan,WANG Jiajia,HOU Changbo
    . 2014, 27(6):  58. 
    Abstract ( 844 )   PDF (804KB) ( 811 )  
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    The digital encrypted recorder is designed adopting the TEA micro encryption on the platform of STM32.The analog audio signal is processed successively by the low pass filter,the amplifier,the A/D conversion and ADPCM coding.The encoding data is encrypted and stored by The STM32 controller.Tests on the encrypted recorder show that the system is stable and reliable in recording,and that the encryption meets the design requirements with good effect.

    Development of an RFID Device
    OUYANG Hongzhi
    . 2014, 27(6):  62. 
    Abstract ( 793 )   PDF (625KB) ( 572 )  
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    A radio frequency identification device is designed based on coupling coil.The system consists of the reader and the responder.The reader is composed of PT2272,coupling coil and LEDs,and the responder of PT2262,coupling coil and dial switches.A single power supply is used and the energy of transponder is all from the coupling coil.Asynchronous serial communication and load modulation are adopted in wireless data transmission.The reader can identify adjacent transponders and display the recognition results with an identification distance greater than 10 cm,an identification rate higher than 95% and a response time is better than 1 s.

    Development on a Universal Scene System for Generating Radar Signal
    CHEN Ding,WANG Fang,LI Tingting,SHI Xiaoping
    . 2014, 27(6):  66. 
    Abstract ( 840 )   PDF (928KB) ( 610 )  
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    To meet the needs of testing the majority of radar system,scene system must generate all kinds of high quality radar signal.A universal scene system for generating radar signal is proposed.There is a Broadband signal modulation system that has function of calibration,this system consist of AWG 7082C Arbitrary Waveform Generators,E8267D Vector signal generator and N9030A Signal Analyzer.It can compile a series of common radar signal by Pulse Building software.Test results show that the system can create all kinds of radar signal to test most of radar system excellently,especially the calibrated system can restrain image frequency perfectly.

    MB-OFDM System Frame Synchronization Detection Technique
    YANG Runfeng
    . 2014, 27(6):  69. 
    Abstract ( 734 )   PDF (557KB) ( 583 )  
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    Wireless local area network communication equipment is usually based on an ad hoc network operation.A frame synchronization detection method is proposed for multi-band orthogonal frequency division multiplexing (MB-OFDM) system to identify piconet and symbols timing.The detection method is based on having correlation of the received and expected local storage of 12 or 24 packages/frame synchronization symbols.The most possible time-frequency code is chosen from the statistics of these correlation results for receiver decoding.The test results show that system stability is greatly improved.

    Design of an X-band High Power Multi-channel Transmit System
    WANG Jie,CHEN Bo,ZHANG Juan,ZHAN Ting
    . 2014, 27(6):  72. 
    Abstract ( 819 )   PDF (679KB) ( 585 )  
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    This paper presents a design of X-band transmit system by synthesizing transmit modules on background of active phased array radar application,with each transmitting module as one channel.The designed modules are completed by MMIC and MCM technology.Output power of the substrate array is more than 80W,and the amplitude imbalance is lower than 0.5 dB.The array has the advantages of small shape,high output power,high reliability and good consistency in continuous wave.

    Analysis and Improvement of Excessive Electromagnetic Radiation of A Rugged Network Switch
    LU Xituan,LIU Shaohua,ZANG Pinyang
    . 2014, 27(6):  75. 
    Abstract ( 767 )   PDF (978KB) ( 520 )  
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    The rugged network switch is a ground vehicle equipment used in a certain branches of military.When the electromagnetic compatibility test on the device is performed,the electromagnetic radiation test items (RE102) exceeds the standard range.Equipment analysis identifies the negative factors leading to the electromagnetic leakage in the shell apertures,cable shielding,power protecting and grounding.Corresponding improvement measures are taken to reduce the shell apertures,enhance the cable shielding,improve power shell and change the grounding mode.The improved device passes RE102 test items.

    Performance Evaluation of Interferometric Synthetic Aperture Radar Jamming
    HAN Chengxi,RAO Xian
    . 2014, 27(6):  78. 
    Abstract ( 730 )   PDF (1210KB) ( 588 )  
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    An evaluation and calculation model of InSAR jamming based on relevant measure are proposed for the performance evaluation of interferometric syntheticaperture radar jamming.The theory of InSAR is analyzed,and the subjective method of performance evaluation is given.Finally,the model of evaluation of InSAR jamming based on relevant measure is analyzed.Simulation shows that the model is valid and accurate.

    MIMO Antenna System Design
    ZHANG Guihua
    . 2014, 27(6):  82. 
    Abstract ( 664 )   PDF (579KB) ( 562 )  
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    In this paper,the criteria for the diversity in MIMO system are generalized systematically.The application scenario of spatial diversity,pattern diversity and polarization diversity are investigated.Then according to the requirement and characteristic of MIMO antenna design and combined with the latest MIMO antenna element and array used in communication system,a terminal array antenna is designed for MIMO systems.It has a practical significance for the design of MIMO systems transmit and the receiver antenna array.

    Design of Intelligent Power Based on DSP
    AI Li,SUN Limeng
    . 2014, 27(6):  85. 
    Abstract ( 608 )   PDF (793KB) ( 639 )  
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    The stability of the airborne equipment relies on the safe and reliable power supply system.In this paper,a power system with automatic monitoring and protecting function is studied,and the intelligent power module's hardware and software implementation method is discussed in detail.Based on DSP processor SMJ320F240,power module structure of 1+1 redundant power supply is adopted,which can realize the current voltage detection,input overvoltage surge suppression,input peak surge suppression and other intelligent management functions.

    Location Algorithm for and Error Analysis of MSSR Radio Interference Source
    WANG Guangyu
    . 2014, 27(6):  89. 
    Abstract ( 690 )   PDF (691KB) ( 582 )  
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    This paper lists the matrix equation based on the space coordinates and the time difference parameter from two monopulse secondary surveillance radars (MSSR) to locate the radio interference source accurately.The space coordinates of the radio interference source are acquired with the minimum norm solution in Euclid norm space.Two auxiliary space surfaces are located with the help of two radars' original video,two-dimensional planar localization algorithm and the introduced new azimuth angle concept.The error analysis and location discrimination are made,which shows that the location ambiguity can be eliminated by means of original video from mode S receiving processor.

    Environmental Adaptability Design of Frequency Synthesizer-receiver for Airborne Radars
    DUAN Jun,BAI Zhenqiang,LU Longlong
    . 2014, 27(6):  93. 
    Abstract ( 798 )   PDF (834KB) ( 605 )  
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    With the improvement of airborne performance and complexity of battle environment,a higher requirement is needed for the environmental adaptability of the airborne electronic equipment.Thus,more attention should be given to the improvement of the adaptability in the structural design of electronic equipment in rigorous environment.The mechanical structure of a frequency synthesizer-receiver for airborne radars based on environmental adaptability is designed in this paper.Vibration,temperature,"three proof" design and electromagnetic compatibility are taken into special account in structural design to improve the quality and environmental adaptability of airborne electronic equipment.

    Design of a Novel Missile-borne Telemetering Communication Antenna
    LIU Hongxi,FAN Bin,L Meng,LI Bei,DONG Shanbin,WANG Lijuan
    . 2014, 27(6):  96. 
    Abstract ( 672 )   PDF (600KB) ( 844 )  
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    Because of the expansion of channel capacity,broader-band is considered as the basic requirement of communication antennas.A new type of missile-borne communication antenna is proposed.The requirement for small size and wide frequency bandwidth are met by loading slots and CPW-fed structure.The characteristics of E-plane omni-directional and broadband are shown by the simulated data.The structure of the antenna is characterized by compact size,simple feeding,broad bandwidth,simple structure and easy fabrication.

    Analysis of the Pseudo Random Code Pulse Doppler Fuze
    SUO Wenbin,ZHANG Lin
    . 2014, 27(6):  99. 
    Abstract ( 679 )   PDF (806KB) ( 430 )  
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    A pseudo random code pulse Doppler fuze is introduced to solve the range ambiguity of the pulse Doppler fuze.Its working principle and the signal processing are analyzed.Signal simulation results show that the combined fuze greatly improves the range ambiguity.

    Design and Application of a Simplified Frequency Extender System Based on the Antenna Measurement System
    ZHANG Zaiqing,LUO Lin,HUANG Wentao,CHEN Xu,MING Zhangjian,YUAN Tongli
    . 2014, 27(6):  102. 
    Abstract ( 746 )   PDF (820KB) ( 567 )  
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    Based on universal antenna measurement system,a new approach is proposed for the frequency extending design and engineering applications.The coherence of local oscillation of mixers and the consistency of up-down frequency converter channels are discussed.The frequency extending is applied to the existing planar near field and far field antenna measurement systems below Ka band.Finally,the antenna measurement results of an array with 8 antenna units of EHF frequency band under two different test systems are presented.The results show that there is a good agreement between the millimeter antenna measurement system and frequency extending system,which demonstrates that the design of frequency converter system can meet the requirement of millimeter wave antenna measurement and has good measurement accuracy.The design for the simplified frequency converter system is generic and low in cost and thus applicable to millimeter antenna measurement.

    Research on Distributed Control System of Multi-motor Based on EtherCAT Bus
    ZHANG Zhen,ZHAO Jun,LIU Weihua,SONG Shoujun,LIU Weiguo
    . 2014, 27(6):  106. 
    Abstract ( 789 )   PDF (1778KB) ( 602 )  
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    A multi motors control system is established for use in industrial fields based on the characteristic analysis of multi motors control,in which the EthCAT industrial real-time Bus is used to combine the locale and remote fields.The slave nodes are motor controllers and data acquisition unit is based on DSP and ESC.Both FPGA and real-time OS are used to accomplish the master control nodes for periodic and aperiodic tasks.In this system,the time service unit is design to realize the time synchronization function based on DC clock of ESC with a synchronous precision better than 1 μs.The configuration and management software is designed for setting operation parameters,analyzing motor running performance and controlling parameters,displaying the dynamic parameters waveform,and estimating the system performance.Application results show that the system features easy and stable operation with good real-time performance.

    Design and Development of a Smart Mil-1394B Bus Emulator
    ZHANG Yang,XIE Wentao
    . 2014, 27(6):  113. 
    Abstract ( 658 )   PDF (935KB) ( 882 )  
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    The current status of IEEE-1394 emulators is introduced.Feasibility of the application of IEEE-1394 in safety-critical/ mission-critical applications for military and aerospace vehicles is analyzed.A new design of Mil-1394B bus emulator is presented,with the hardware and driver designs given.

    Technique of Correct Fusion Track Judgment Based on Detecting Precision of Multi-Sensor
    HUI Liming
    . 2014, 27(6):  117. 
    Abstract ( 694 )   PDF (640KB) ( 587 )  
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    The correct mutuality judgment of fusion track and true track is the basis of the capability evaluation for the multi-sensor data fusion.The detecting precision of sensor has great influence on the capability of fusion system.This paper presents a new technique of fusion track judgment which calculates detecting precision of every sensor participating in data fusion and makes the precision as the judgment distance threshold of fusion track and true track,thus improving the processing efficiency and accuracy of judgment.Engineering applications prove the feasibility of the algorithm.

    Design of Temperature and Humidity Measurement System Based on SHT11 Sensor
    YU Xuan,ZHANG Dongxu,FU Wenzhuo
    . 2014, 27(6):  121. 
    Abstract ( 704 )   PDF (756KB) ( 583 )  
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    A temperature and humidity measurement system based on SHT11 and MCU technology is presented in this paper.SHT11 temperature and humidity sensor is used in this system to collect temperature and humidity data and AT89s52 MCU is used for data storage and computing.A temperature and the humidity detection system with multiple functions is designed by the expansion of peripheral circuit.The system has the advantages of high measuring precision,high reliability,small volume,low cost,and convenient operation.

    Design and Implement of Statuses Monitoring Circuit Based on C8051F040
    JIANG Jun,LI Xiong,SONG Dong
    . 2014, 27(6):  126. 
    Abstract ( 838 )   PDF (554KB) ( 585 )  
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    The normal sailing of a vehicle is determined by monitoring the presence of voltage of the important circuit and storing the CAN messages in communication.The voltage of the monitored circuits by the optical coupling TPL281-4 is connected to the pins of the microprocessor C8051F040.If no voltage exists,the time and the message are stored in the chip of AM29F160DT.The application results show that the monitoring circuit meets the design requirements.

    Design of Automobile Wiper Control System Based on LIN
    CHENG Licun,GUO Lijin,LV Yafeng
    . 2014, 27(6):  130. 
    Abstract ( 653 )   PDF (728KB) ( 567 )  
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    An intelligent windscreen wiper system using a distributed control scheme based on LIN bus is designed with MC9S12DG128 as the main controller and MM908E625 as the wiper controller to improve the security and intelligence of the wiper system.The MCU changes the signal of touched screen into a LIN command to control the start-stop of the wiper,and controls the swing frequency of wiper automatically by detecting the volume of rainfall via infrared sensors.Its uses do not require the driver's manual operation.The experimental results show that the system achieves effective intelligent control over automotive wiper according to the rainfall.It has the advantages of good security,high reliability and low cost.

    Design of Intelligent Multi-band LED Insects Trapping System Based on Micro Control Unit
    ZHUANG Liangqian,XIAO Zhihong,SHEN Jun
    . 2014, 27(6):  134. 
    Abstract ( 812 )   PDF (615KB) ( 584 )  
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    An intelligent multi-band LED trapping insects system with solar as power is designed for economic and lower pollution worm killing.The pins connection of the major circuit diagrams is given,and the system software is designed with detailed flow chart presented.The software and hardware of the chip microprocessors are debugged to achieve corresponding functions.

    Design and Implementation of Multi-channel Data Acquisition and Storage
    HAN Yunjie,LIU Yuhong,BAO Huawei
    . 2014, 27(6):  137. 
    Abstract ( 948 )   PDF (496KB) ( 722 )  
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    STM32F103 chip is adopted as the host to realize multi-channel data acquisition and storage.The multi-channel analog-to-digital conversion chip AD7793 is used for data collection,and the collected data is shown on the LCD screen.The USB host interface is designed based on USB control chip CH376,which control  the data read and write directly into mobile storage devices only by sending and receiving instructions via serial port,thus solving the lack of the micro-controller pin resources.

    Structure Design of Open Airborne Electronic Equipment
    ZHANG Fenghua,LUAN Qianjin,REN Kang
    . 2014, 27(6):  140. 
    Abstract ( 826 )   PDF (689KB) ( 638 )  
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    A new heat-dissipation structure with fan for airborne electronic equipment is provided which adopts open air duct to increase heat-dissipation efficiency.Technical difficulties such as electromagnetic seal and dustproof design are solved by applying open structure to airborne environment condition successfully.Design requirements and key points of the design of the open structure are introduced in detail by the implementation of specific products.

    Vehicular Detection of Trace Warning System of Poisonous CO Gas
    LU Yi,CHEN Xing,MA Yuanming
    . 2014, 27(6):  143. 
    Abstract ( 688 )   PDF (784KB) ( 548 )  
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    Real-time CO concentration detection alarm system is based on single chip microcomputer AT89S52.A sensitive carbon monoxide TGS2600-B00 sensor is used for detecting CO samples in the air.The sensor resistance changes reflect the change of the concentration.It treats the data are converted by AD converter ADC0809 before they are processed by single-chip computer.The current CO concentration is showed on the LED in real time and an alarm is activated if it exceeds 30×10-6.This system has the advantages of high sensitivity,simple structure,small size and easy installation.It can find applications in avoiding traffic accidents and monitoring physical and mental health.

    A design Method of PID Accumulator Control Based on Feedforward Compensation
    LI Juan
    . 2014, 27(6):  146. 
    Abstract ( 694 )   PDF (752KB) ( 584 )  
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    This paper analyzed the demand of accumulator control under five conditions,adopted open-loop and closed-loop control method.To the characteristic of accumulator control,designed PID control method based on feedforward compensation.For improving the accuracy of PID control and decreasing the difficulty of parameter tuning,adopted multi-group PID parameters.Though experiment,tested the result of accumulator control under high idle condition and low idle condition,and the gap of control value and feedback value is lower 1.7%.

    Design and Development of Freshman Registration Management System
    YE Zhilin
    . 2014, 27(6):  150. 
    Abstract ( 791 )   PDF (778KB) ( 459 )  
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    According to the actual situation and actual demand,the author developed a freshman registration managemanet system which based on B/S framework design pattems,used ASP and SQL technology.The system realize collaborative work over network and Real-time data updating,solve the problems and shortcongings which lie in the traditional manual management mode,imprve work efficiency and service level.

    Construction of CFD Software Verification and Validation of Database Systems
    QI Zhimin,CAO Pingkuan
    . 2014, 27(6):  153. 
    Abstract ( 636 )   PDF (735KB) ( 549 )  
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    In order to promote the research work of CFD software verification and validation and to fit the needs of CFD software reliability analysis requirements.CFD software verification and validation database system must be established.We analyzed the characteristics of the CFD software verification and validation data and studyed the data organization and the design techniques of the database system.System architecture and main functions of the system are proposed and the development work is also started.All of the above work provide a data supporting platform for CFD software verification and validation studies.

    Improvement and Implementation of Concatenated Decoding for LDPC Codes
    CHEN Meng
    . 2014, 27(6):  156. 
    Abstract ( 760 )   PDF (663KB) ( 502 )  
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    An FPGA implementation scheme for the OSD serially concatenated decoding algorithms is proposed for LDPC codes with short or moderate code length.Our scheme implements the GF(2) Gaussian elimination used in OSD algorithm based on the block RAM resource of the FPGA chip,which avoids the large quantity of logic resource demand for the conventional implementation of GF(2) Gaussian elimination.Implementation result shows that the concatenated decoder with 500 kbit·s-1 throughput can be achieved on middle and low grade FPGA using this scheme.

    Network Server Design Based on MPC8313E
    YAN Chenyang,YAN Yisong,LI Taotao
    . 2014, 27(6):  160. 
    Abstract ( 811 )   PDF (502KB) ( 524 )  
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    This article adopts the approach based on embedded Linux network server for the high-speed uploading of large amount of data in memory module to the host computer.We use MPC8313E as master chip for network socket programming and transmit data to the host computer via Gigabit Ethernet.Tests show that the transfer rate of the system is up to 104 Mbit·s-1 and can meet the requirements of the actual system.

    Design and Implement of a Radar Data Processing System Based on PowerPC
    LIU Bing,SUN Aizhong
    . 2014, 27(6):  163. 
    Abstract ( 591 )   PDF (628KB) ( 487 )  
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    A design of calculation module based on the dual-core PowerPC processor is proposed for better processing power of modern weapons in harsh environment.The design ideas and implementation processes of calculation module based on the dual-core PowerPC processor are presented with an example based on PowerPC755.The design has the advantages of high capability,low power consumption,and good flexibility,and finds practical application with good results.

    Simulation and Co-verification of SoC Based on OR1200
    LUO Qiuxian,ZHANG He,LUO Guocheng
    . 2014, 27(6):  168. 
    Abstract ( 664 )   PDF (637KB) ( 650 )  
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    This paper introduces a method for software and hardware co-simulation and co-verification of SoC based on OR1200.OR1200,WishBone,UART,Advanced Debug System and JTAG cores are used to build the hardware system.The GNU tool chains are used to develop programs,which are simulated with or1ksim.The co-verification of hardware and software is achieved with simulation software on FPGA via JTAG.

    A New Image Fusion Method Based on Laplacian Pyramid in Wavelet field
    HUANG Xiaodan
    . 2014, 27(6):  170. 
    Abstract ( 978 )   PDF (764KB) ( 559 )  
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    Based on an in-depth analysis of the theory of wavelet transformation (WT) and Laplacian pyramid transform (LAP),a new method for image fusion delicately combining both of them is proposed in this paper.Experimental results show that the proposed method is superior in performance to other fusion methods with its little calculation amount and fast operation in infrared and visible light images fusion,multi-focus image fusion and local fuzzy image fusion.

    Substation Environmental Monitoring System Based on GPRS/CDMA
    TAO Yan,WANG Qinghua
    . 2014, 27(6):  174. 
    Abstract ( 706 )   PDF (675KB) ( 493 )  
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    Substation environment monitoring becomes increasingly complex with growing number of substations.this article designs environmental monitoring system of substation on account of GPRS/CDMA in view of their scattered location and the absence of dedicated data transmission channel.The composition and functions of the system are introduced.The system is capable of data collection,analysis,and long-distance transmission,and provides a practical solution to distribution automation.

    Libnet-based Technology Intermediary Service Platform
    ZHANG Qining,ZHANG Tianjin,WU Guojun
    . 2014, 27(6):  177. 
    Abstract ( 800 )   PDF (751KB) ( 448 )  
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    Libnet is applied to enhance the security of the existing science and technology intermediary service platform.PHP web development language is used to build the science and technology intermediary service platform to improve the system functions with four integrated functional modules:the trading platform integration services,technology information service platform,public technical service platform and business incubator services platform of science and technology intermediary service platform.

    Research on Micro-Displacement Measurement System Based on PSD
    WANG Shuaishuai,ZHU Lianqing,ZHOU Weihu,DONG Dengfeng,ZHOU Peisong
    . 2014, 27(6):  180. 
    Abstract ( 745 )   PDF (728KB) ( 332 )  
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    The structure,characteristics and operational principle of PSD are introduced in this paper.A micro-displacement measurement system based on PSD with high precision is designed.Aiming at the characteristics of PSD signal output and requirements of practical application,a system is designed based on the PSD signal acquisition,processing and transmission to PC.MCU collects signal output by PSD via ADS7864 and transmits the processed data to the host computer via the RS232 interface.The displacement value is displayed on the PC interface,which realizes real-time measurement of light spot's micro-displacement.Experimental results show that the system has quick response and high accuracy,and can be widely used in micro-displacement measurement.

    Effect of the Multi-quantum Barrier Electron Blocking Layer on the Efficiency of UV LED
    HUANG Yong,LI Peixian,BAI Junchun,WANG Xiaobo
    . 2014, 27(6):  184. 
    Abstract ( 785 )   PDF (523KB) ( 394 )  
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    The influence of the thickness of the multi-quantum barrier electron blocking layer (MQB-EBLs) on the efficiency of InGaN-based ultraviolet (UV) light-emitting diode (LED) is discussed.The dominant factors of the effect of thickness of MQB-EBLs on the efficiency of InGaN-based UV LED are investigated.The results show that the light output power (LOP) of 387 nm UV LED can attain 8.47 mW when the thickness of quantum well and barrier of the MQB-EBLs are 2 nm and 3 nm,respectively.

    Photovoltaic MPPT Algorithm Based on PSO
    SUN Huiming,CHEN Wei
    . 2014, 27(6):  187. 
    Abstract ( 794 )   PDF (529KB) ( 536 )  
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    In view of the poor accuracy of photovoltaic system maximum power point tracking (MPPT),a new photovoltaic MPPT is proposed,which combines the improved constant-voltage method based on temperature correction coefficient online with particle swarm optimization algorithm.When the system deviates from the maximum power point,a new operating point can be searched through the improved constant voltage method quickly.With the help of PSO maximum power control,accuracy is improved at the same speed.Simulation of the method in Matlab/simulink shows that the system can search the maximum power point quickly.

    Smart Regional Electricity Safety Integrated Public Service System
    WANG Jun,SI Feng,LUO Yunpeng,ZHAO Jichao
    . 2014, 27(6):  190. 
    Abstract ( 810 )   PDF (819KB) ( 344 )  
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    Electricity load is ever increasing in modern times.In order to improve the electricity safety of power users,this paper designs an integrated service system based on distributed network.Monitoring analysis and predicting the condition of distribution systems in real time,the system makes predictive maintenance possible,and then timely dispatches maintenance service to shorten interruption duration,to improve electrical safety,and to reduce the cost of maintaining distribution systems.

    Research on Information Industry Development in Western China Based on the Gray Correlation Method
    ZHAO Wenping,LI Lamei,SONG Lingyu
    . 2014, 27(6):  193. 
    Abstract ( 726 )   PDF (648KB) ( 331 )  
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    The present situation of Shaanxi province,Sichuan province and Chongqing information industry is introduced,and the correlation between 2006-2010 Shaanxi Province information industry and Shaanxi economic development is analyzed by gray correlation method.Some development ideas and policy suggestions are put forward.And the significance the information industry on the national economy growth and development of western China is studied.

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