Table of Content

15 September 2013 Volume 26 Issue 9

  

Articles

Test Scheduling of NoC Based on Cloud Evolution Algorithm

HOU Xubin

. 2013, 26(9):  1. 

Abstract ( 933 )   PDF (573KB) ( 827 )  

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In order to reduce the test time of NoC,the problem of how to use the limited on-chip resources to maximize parallel test in power constraints is discussed.This paper presents a method for using the cloud evolution algorithm to schedule the IP cores,which effectively improves the test efficiency.The method reuses the on-chip network as TAM (test access mechanism),using non-preemptive test and XY routing mode and optimizing the allocation of IP cores in each TAM by the cloud evolution algorithm.Experimental results from the ITC'02 system-on-chip benchmarks show that this method effectively reduces the test time and improves the test efficiency.

Robust Brain fMRI Image Parcellation with Prior Information

SONG Dandan

. 2013, 26(9):  4. 

Abstract ( 864 )   PDF (815KB) ( 1054 )  

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Resting state functional magnetic resonance imaging (fMRI) data have been increasingly used for identifying functional subunits of the human brain by clustering image voxels using algorithms such as k-means and spectral clustering.However,such unsupervised clustering methods are sensitive to imaging noise,thus generating unstable brain parcellation results.In this study,we present a prior information guided,semi-supervised clustering method to identify reliable boundaries between functional subunits for achieving robust brain parcellation.The proposed method has been validated for parcellation of Broca area (Brodmann areas 44 and 45) in the right hemisphere of the human brain based on resting state fMRI data.Experimental results demonstrate that our method not only identifies more reliable boundaries between functional subunits,but also achieves higher reproducibility across subjects.

Design of a Scheme of Flow-based Campus LAN Traffic Statistics

ZHANG Xin,LI Yinfeng

. 2013, 26(9):  7. 

Abstract ( 816 )   PDF (535KB) ( 801 )  

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In this paper,the concept of flow is introduced and the principle of traffic collection in the Linux system based on Libpcap is studied.A scheme of flow-based campus local area network (LAN) traffic statistics is proposed on the basis of the analysis of the methods of campus LAN traffic statistics,and the overall design of the scheme and the implementation of the algorithm are given.

Semi-Supervised Regression Based on Particle Swarm Optimization and Support Vector Machine

MA Lei

. 2013, 26(9):  10. 

Abstract ( 1003 )   PDF (597KB) ( 762 )  

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The paper combines support vector machine based on particle swarm optimization with semi-supervised regression theory to bring about a semi-supervised regression model.The paper uses the experimental datasets to compare with the genetic algorithm supervised support vector machine model and the particle swarm optimization support vector machine.Experimental results show that the semi-supervised regression model based on particle swarm optimization support vector machine can improve the precision of regression estimates.

Research on an Ignorable Cache Algorithm Based on ABT Tree

XIAO Yu,LIU Hongyi,YANG Ming

. 2013, 26(9):  14. 

Abstract ( 753 )   PDF (758KB) ( 727 )  

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The computer's capability depends more on memory access than on the CPU's original ability.Real-time simulation needs many datasets,while the shortage of memory will become the main limitation.More loss of cache will results by those algorithms which cannot take full advantage of multilevel storage structure.The ignorable cache algorithm based on ABT tree has good adaptability,and offers a desirable substitute scheme for the algorithm of cache-awareness.And these two methods have basically the same effect.

Research on Face Detection Based on Skin Color and Improved Adaboost Algorithm

WANG Xun,ZHAO Huaixun,LIU Xiwei1

. 2013, 26(9):  18. 

Abstract ( 939 )   PDF (799KB) ( 717 )  

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In order to improve the accuracy and speed of face detection,the article brings about a new way of face detection which combines skin color and improved Adaboost arithmetic.First,a Gaussian skin model is set up to handle the pending images under the YCbCr Color Space so as to obtain the Color likelihood images,and the color area is divided by adaptive threshold method to obtain the candidate face area.Then the article improves the Adaboost arithmetic by Harr rectangle feature expanding and sample weights update.This method solves the problems of fallout ratio and false dismissal probability of face detection in complicated background images,thus improving the detection efficiency.

Robot Path Planning Algorithm in Unknown Environment

LI Shuxia

. 2013, 26(9):  22. 

Abstract ( 732 )   PDF (383KB) ( 930 )  

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This paper proposes a twice-path-planning method based on the shortest tangent for mobile robot.This method can update the environment information and re-planning paths to find the path of robot in unknown environment planning according to the robot's position and orientation.This method broadens the scope of the original method,and improves the level of intelligence and path planning capabilities of robot.

Motion Tracking of Ship Model Based on the Optical Technology

LIU Ke,WEI Naxin,LIU Fei1

. 2013, 26(9):  24. 

Abstract ( 724 )   PDF (790KB) ( 662 )  

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In order to obtain the position and motion of the ship model in wave basin and track the moving ship model real-time,a method based on the optical technology is proposed to meet the real-time requirement of tracking moving ship model by scaling the core of stamped area.With a special mark on the ship model and using the Gaussian function with respect to the Bhattacharryya coefficient to adapt the scale of stamped core,the robustness of mean shift algorithm is enhanced while keeping the advantage of high speed.Experiment results indicated the algorithm can scale the window of identification adaptively and restrict the mark in the center of the window,thus improving the accuracy of tracking.

Remaining Life Forecast Model Based on Kalman Filter

ZHAI Libo,HAN Ning

. 2013, 26(9):  28. 

Abstract ( 1137 )   PDF (599KB) ( 779 )  

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The vibration severity is an evaluation index of remaining life.To improve the vibration severity forecasting accuracy and solve the problem of time delay of forecasting by time series model,the author proposes a hybrid algorithm integrating time series analysis with Kalman filter.The basic concept of this algorithm is as following:firstly,by use of time series analysis theory,the stationary modeling for vibration severity is proceeded to obtain the model equation conforming to its variation law;secondly,by means of the obtained model equation the state equation and observational equation for Kalman filter are deduced;thirdly,the vibration severity is forecasted by Kalman forecasting recurrence equation;and finally,the forecasting for vibration severity is conducted to validate the proposed hybrid algorithm.Case study results show that by using this hybrid algorithm the forecasting accuracy of vibration severity is improved and the time delay in the forecasting is well solved.

Research on Doppler Characteristics and a Compensation Method for Biphase Coded Signal

TIAN Xiaobin

. 2013, 26(9):  31. 

Abstract ( 775 )   PDF (603KB) ( 792 )  

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The Doppler characteristics for Biphase Coded Signal and a compensation method are studied in this paper.The change of code wide can be ignored,while the Doppler frequency shift leads to the Doppler-mismatch in the Radar receiver severely.A compensation method based MTD is presented to correct the mismatch and detect the moving target effectively.

RFID Indoor Location Based on Newton Interpolation

ZHOU Dun,HU Fangming,HU Huapeng,ZHANG Zhao

. 2013, 26(9):  34. 

Abstract ( 949 )   PDF (526KB) ( 804 )  

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The rapid development of wireless network in recent years witnesses various indoor positioning related technologies and applications.This paper puts forward an indoor localization algorithm based on Newton interpolation.Radio frequency identification (RFID) is combined with LARNDMARC system to solve virtual label using interpolation,thus a more precise positioning of tags.Experiments show a significant improvement in positioning accuracy by this algorithm over the k neighborhood algorithm.

Football Tracking Algorithm Based on HOG and Particle Filter in Broadcast Soccer Video

XU Faguo,ZHENG Xiang,LV Tao2

. 2013, 26(9):  36. 

Abstract ( 898 )   PDF (1021KB) ( 859 )  

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 In soccer video broadcast,football tracking is very difficult due to the football players' moving,camera zooming,etc.As a consequence,previous background based target detection and tracking method cannot track a football effectively.Football has only a few pixels in an image and moves irregularly and sometimes similar targets such as socks exist,which makes football tracking even harder.This paper presents a football tracking algorithm based on Histogram of Oriented Gradients (HOG) and particle filter to achieve robust football tracking in soccer video broadcast.With the fusing the HOG and color feature,the structure information and color information of a football are well modeled in particle filter tracking framework.The experiment shows that the proposed algorithm is accurate and robust even in the case where similar targets exist.

Modeling,Simulation and Analysis of Via in High-speed Multilayer PCB

WANG Yongjun,WANG Junming

. 2013, 26(9):  41. 

Abstract ( 934 )   PDF (779KB) ( 797 )  

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High-speed PCB board vias modeling and simulation are made using Hyperlynx software to analyze the influence of the vias on the signals running through them,and an improved and optimized via hole method is proposed.Simulation results show that in the case of requirement of a high line signal integrity,circuits using via holes connection are improved and optimized.

A WiMAX Access Authentication Method Based on ECC

YAN Lin,LU Chen,ZHANG Qiyun

. 2013, 26(9):  44. 

Abstract ( 732 )   PDF (828KB) ( 760 )  

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Authentication and access control of WiMAX is an important way to protect the internet resources and guarantee the normal running state of the internet.This paper introduces the access control mechanism and analyses its disadvantages,then proposes a access authentication based on ECC.The ECC is introduced first,after which a new access control process and ECC scheme is designed.Finally,the advantages and security of the new scheme are analyzed.This method proves to be more secure and more convenient for the limited mobile terminal as to the aspect of storage and computing ability than the existing methods.

Double Balanced Detection of Optical Fiber Acoustic Sensor Based on Sagnac Interferometer

ZHU Jianfeng

. 2013, 26(9):  47. 

Abstract ( 806 )   PDF (733KB) ( 692 )  

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In order to solve the problem that traditional acoustic-electric microphone is susceptible to corrosion and electromagnetic interference,an acoustic-optic transducer structure which uses optical fiber to extract the sound is proposed.In this paper,the sensor prototype is based on Sagnac interferometer,the sound pressure is used to act on photo-elastic effect which generated by the optical fiber to achieve light-phase modulation,and a 3 × 3 coupler is used to build dual optical path balanced detection system.The demodulation of the speech signal is done through interference,which can realize two equal amplitude' signals differential processing,eliminating common mode interference signal and reducing light source noise.The experiments show that the system is stable with small waveform distortion.Voice signal extraction and restoration are implemented successfully in the range of 300~3 400 Hz.

Influence of Silicon Surface Roughness on the Interface States

CHEN Shuhua,WU Hua,ZHOU Hongyi,CUI Wenkai,MA Yunfei,GUO Xia

. 2013, 26(9):  50. 

Abstract ( 857 )   PDF (753KB) ( 660 )  

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The sub-surface damage layer generated by grinding and polishing may effect the carrier lifetime and interface states of the silicon surface.Several samples for different roughness are fabricated by mechanical thinning,mechanical polishing and chemical mechanical polishing (CMP) processing in this paper.The Fourier transform infrared transmission spectroscopy and C-V test are used to analyze the samples.The results show that the higher the roughness of the silicon surface is,the lower the infrared transmittance and the higher density of interface states will be.

Implementation of High-speed Serial Loopback Communication Based on RocketIO

SU Xiuni,LI Yingli

. 2013, 26(9):  54. 

Abstract ( 866 )   PDF (947KB) ( 767 )  

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The application of high-speed serial communication is very wide,but it has some defects in development cycle,the stability and reliability of the system.To improve the performance,the paper proposes an implementation of high-speed serial communication.The design of high-speed serial loopback communication is based on RocketIO in Xilinx development environment ISE.Error bit rate of the design is analyzed by Internal Bit Error Ratio Tester,and its value proves to be low,which guarantees the stability and reliability of design.The design is also simple in development with good scalability.

Study on the experiment for Separation of the Bioradar Heartbeat and Respiratory Singal Based on Simulated Household Monitoring

ZHANG Hua,JING Junyao,LI Sheng,ZHANG Pengfei,YU Xiao,L Hao,LU Guohua,WANG Jianq

. 2013, 26(9):  57. 

Abstract ( 810 )   PDF (702KB) ( 766 )  

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Objective  This study aimed to separate the breathing and heartbeat signal effectively from the biological radar echo signal,as well as extract the breathing and heartbeat characteristics in order to provide the basis for clinical diagnosis and disease prevention.Methods  Analysis the characteristics of the radar echo signal,use the combined harmonic of the breathing signal as a reference input signal of the adaptive filter to improve the algorithm.Related experiments were designed and completed.Results  This paper presents a separation algorithm of heartbeat and respiration based on LMS adaptive harmonic cancellation.Conclusion  The output results suggest that the results of simulated household monitoring experiments were quite well.

The Passive Positioning Technology for Fixed Radiant

LI Peng

. 2013, 26(9):  61. 

Abstract ( 928 )   PDF (1098KB) ( 858 )  

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This paper introduces the single observer passive location of the fixed target of radiation sources,stations with the goal to achieve fast ranging and positioning relative tangential to the the movement azimuth rate of change and the rate of change of pitch angle,and analysis of the measured parameters,positional parameters on the positioning accuracy,draw a positioning accuracy of geometric distribution (GDOP) of this positioning method algorithm simulation analysis.Simulation results show that single-ranging positioning relative error as the distance increases,after repeatedly observed multiple time instantaneous positioning results of its statistical filtering processing to improve locate and track conditions,reducing the positioning errors.

A Curvature-compensated Bandgap Reference with Low Supply Voltage

XIAO Ben,FENG Ning,XIAO Ming2

. 2013, 26(9):  65. 

Abstract ( 877 )   PDF (664KB) ( 695 )  

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A curvature-compensated bandgap reference voltage is designed based on a circuit that produces an I2PTAT current and a circuit works on CMOS Sub-threshold based on Chrt 0.35 μm CMOS model.Testing results of chip show that the bandgap reference operates at 1.2 volts,and has an average temperature coefficient less than2×10^-6/℃ between -20 to 120 ℃.The bandgap reference can be used in high resolution ADC,DAC,and soc chip.

Principle and Maintenance of No-response Resistive Touch Panel

CHEN Lei,HU Fayun

. 2013, 26(9):  69. 

Abstract ( 731 )   PDF (456KB) ( 775 )  

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This paper discusses the performance of the four kinds of touch screens,analyzes the problem of no response of the touch resistance touch screen caused by improper operation,outlines the operating principle and fault detection method with Siemens MP227 as an example,and describe in detail the maintenance procedures.Practice shows that the maintenance method is easy to learn and low in cost.

Failure Analysis of E²PROM SM9968

LIU Bing,SUN Aizhong,XIE Tao

. 2013, 26(9):  71. 

Abstract ( 911 )   PDF (809KB) ( 720 )  

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It was found in use that the E2PROM chip loses data,for which reason the computer cannot work normally.A thorough analysis shows that the reason of the chip's failure is that the technological parameters "RRPOLY" exceeds tolerance.A solution is proposed by introducing a hard-lost test in stress screening.Validation tests show that this measure is feasible and effective.

Dynamics Analysis of Electric Locomotive on Straight Track under Braking Working Conditions

LAI Kui,CHEN Qing2

. 2013, 26(9):  74. 

Abstract ( 796 )   PDF (825KB) ( 570 )  

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The dynamical model of 200 km/h locomotive is set up with the use of the dynamics analysis software SIMPACK.By the dynamics performance comparison between idling condition and braking work condition on straight track,the effect of dynamics performance under braking work condition is obtained.

Design and Implementation of the Motor Torque Speed Tester

ZONG Bingchen

. 2013, 26(9):  78. 

Abstract ( 845 )   PDF (911KB) ( 717 )  

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According to the requirements for the measurement of the torque and rotation speed of power machinery,a motor torque speed tester is designed using the motor torque and speed sensor to achieve a high-precision measurements of the motor torque and speed.As for the hardware,microcontroller (R8C/25) is used as the data processing core,the linear DC power supply is designed using isolation transformer to reduce the electromagnetic interference caused by traditional switching power supply,and the sensor output signal is isolated by high-speed optocoupler to improve the anti-jamming capability.As for the software,timing pulse count is adopted taking advantage of the microcontroller event counting function and the external interrupt function synchronous torque and speed pulse signal to calculate the torque value and speed values,and then calculate the shaft output power.Measured values are displayed real time on the digital tube.The sensor calibration results verify the correctness of the system design.

Hearing Aid Loudness Compensation Strategy Based on Human Auditory Characteristics

WANG Peng,PEI Dongxing,ZHANG Bo,WANG Yajun

. 2013, 26(9):  82. 

Abstract ( 874 )   PDF (571KB) ( 682 )  

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A digital hearing aid is designed for patients with age-related hearing damage with both frequency and sound intensity level in mind in the voice signal loudness compensation.Based on the characteristics of the human auditory,a dynamic compressed loudness compensation strategy is proposed.The ear-sensitive low-frequency and high-frequency to speeches are simulated in Matlab.The results indicate that this compensation strategy guarantees the rationality and integrity of the loudness compensation effect of the digital hearing aids.

An Integrated Development Platform for Arinc659 Bus Based on the Protocol Chip and Toolkit

ZANG Wei,LIU Fang,LI Rui

. 2013, 26(9):  85. 

Abstract ( 1279 )   PDF (1313KB) ( 86903 )  

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Devoted to the development of ARINC659 bus applications in flight control systems with stringent requirements on safety and reliability,the integrated development platform is characterized by ARINC659 and IEEE1149.5 protocol-compliant digital chips and an original specialized toolkit for the overall timing planning-a key step in engineering applications.Empowering efficient time planning and monitoring-debugging on the basis of an LRM and a cabinet,the two integral parts work as an organic whole to form a sound and general platform for safety-critical systems.

Greenhouse Environment Data Acquisition and Wireless Transmission System

LU Songquan

. 2013, 26(9):  89. 

Abstract ( 861 )   PDF (611KB) ( 788 )  

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Environmental data acquisition system uses STC single chip microcomputer as control core to realize the accurate acquisition of greenhouse of light intensity and temperature and humidity data,and after treatment for display and remote transmission.Among them,the collection of light intensity data is through the photosensitive resistance voltage by A/D conversion,the collection of temperature and humidity data is through the integrated temperature and humidity sensor DHT90.The system is stable and the data is accurate and reliable.

Research on the Shielding Effectiveness of High Frequency Electromagnetic Shielding Textile

HU Weidong,LI Ping,PENG Yu3

. 2013, 26(9):  92. 

Abstract ( 933 )   PDF (866KB) ( 892 )  

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Non-solid shield are used to replace the metal plate to screen electromagnetic radiation.Based on the theory of electromagnetic compatibility,the electromagnetic radiation shielding results of metal lattice are analyzed in depth by using electromagnetic field theory and numerical calculation method.The effect of three variables aperture width l ,wire diameter d and quadrilateral apex angle θ on shielding effectiveness is studied.First,modeling and simulation with the electromagnetic simulation software HOBBIES is done,the corresponding SE of different mesh size is calculated,and finally the conclusion is drawn by comparing the two different results.

Methods for Generating the Sinusoid for Control by Stepping Motor

JIANG Lin,TAN Xilian,ZOU Tao,XU Hengcheng1

. 2013, 26(9):  95. 

Abstract ( 836 )   PDF (612KB) ( 542 )  

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This article introduces a method for the generation of the sinusoid for control by stepping motor.In order to generate the sinusoid for testing control,the normal sinusoid is changed into time data of the timer by software.According to the data of the timer,the singlechip turns the electromotor by the law of sinusoid.The parameters of sinusoid control signal are optional.

Real-time Capture Monitoring System Design Based on S3C2440 Chip

HAN Yezhong,ZHU Chengguo

. 2013, 26(9):  98. 

Abstract ( 913 )   PDF (753KB) ( 971 )  

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In this paper,a minimized real-time monitoring system with storage function has been designed based on S3C2440 chip.This monitoring system respectively select infrared sensor,CMOS imaging sensor OV9650,TQ043TSCM-V LCD,SDHC of SANDISK as detection module,image acquisition module,real-time display module and storage module.In order to make the monitoring had excellent real-time performance and minimized application program,the program of this monitoring system has been designed without operating system.Through many times test,the system has been proved that it not only captured object sensitive,but also displayed image continuous and clear.The system has showed favorable stability and application.

Design of Intelligent Terminal Based on dsPIC

MAO Jianwei,XU Qingkun,WANG Junwei

. 2013, 26(9):  102. 

Abstract ( 858 )   PDF (804KB) ( 865 )  

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In modern power systems,power monitoring equipment devices require more and more information of the excitation equipment.Because of the hardware limitation of excitation equipments,excitation signals can not be expanded infinitely.The Intelligent Terminal presented in this paper solves the problem of signal interface shortage.This paper introduces the intelligent terminal based on dsPIC and presents the experimental result.The intelligent terminal is not only highly integrated and simple in hardware,but also convenient,reliable and low in cost.

A New High-speed Variable-bandwise Digital Down-converter Based on FPGA

PANG Shaolong,MA Zhigang,WU Zixian

. 2013, 26(9):  106. 

Abstract ( 799 )   PDF (1000KB) ( 758 )  

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Digital Down-Converter is a key component of Variable-bandwise digital receiver.Since it is hard for the typical DDC structure to implement high operation rates of mixing and filtering,for the miniaturization and low power requirements of SDR (Software Defined Radio),a new method is proposed for implementing Digital Down-Converter in Variable-bandwise digital receiver based on FPGA.This method is based on orthogonal poly-phase filter processing.This paper analyzes the principle of its design and FPGA implementation,and finally gives the test results,which shows that the design has good scalability and flexibility.

Research on Signal Feature Extraction in Wire and Cable Fault Based on Wavelet Analysis

DU Hongchao

. 2013, 26(9):  110. 

Abstract ( 861 )   PDF (643KB) ( 520 )  

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The wire and cable,as a basic industry of wide applications,occupies 1/4 the output value of China's electrical industry,second only to the automotive industry,and is considered as the “artery” and “nerve” of national economy.In recent years the determination of the point of failure for the wire and cable has been attracting in-depth study by domestic and foreign scholars.By means of experimental simulation and with the help of the wavelet analysis,threshold denoising method is discussed,and its application in the cable fault diagnosis is studied.Experimental results show that the method is feasible in cable fault characteristic signal extraction.

A Simulation System for Controlling of Elevator in Parallel Based on LabVIEW

HAO Jing,XU Xianfeng,SUN Ze

. 2013, 26(9):  113. 

Abstract ( 830 )   PDF (900KB) ( 851 )  

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The research on the parallel control system of elevators has great practical values.The double ladder parallel control simulation system based on the LabVIEW is designed.A double ladder system can run independently or run under parallel scheduling control.The simulation system tests the performance of the full selective elevator.Experiments show the superiority of double parallel scheduling control system ladder to double ladder running independently.

An Efficient Method of Delay Estimation for Broadband Delay-based Macromodeling

LIU Feifei,ZHANG Songsong

. 2013, 26(9):  117. 

Abstract ( 922 )   PDF (752KB) ( 696 )  

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In the modeling and simulation for electrically large interconnect of high-speed circuit,the high simulation efficiency of Broadband Delay-based Macromodel is becoming more of a concern,but the existing methods of delay estimation are time-consuming,which severely limit the overall macromodeling efficiency.For this,an efficient delay-estimation method based on the IFT is presented in the paper.The efficient method not only is able to estimate multiple delays from tabulated frequency data,but also can identify the dominant delay terms for optimizing the modeling process.This method is implemented in MATLAB and compared with the Gabor transform-based method mostly used in frequency domain.The experimental results show that the proposed method greatly improves the efficiency of delay estimation and achieves high accuracy in use of broadband frequency domain data.

Design of a Novel Constant Gm Rail-to-Rail CMOS Op-Amp

XUE Chaoyao,HAN Zhichao,OU Jian,HUANG Chong

. 2013, 26(9):  121. 

Abstract ( 832 )   PDF (763KB) ( 731 )  

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A novel constant transconductance rail-to-rail CMOS operational amplifier is proposed in this paper.Its rail-to-rail input stage consists of four MOSFETS as dummy differential pairs to limit the current of the differential pair to provide a constant transconductance value within the ranges for the operating region.A front-feed class AB output stage is used to ensure that the output swing achieves rail-to-rail.The simulation results show that the input common-mode range reaches rail-to-rail with a variation of the gm of only 3%;the Op Amp performs an open-loop gain of 108.5 dB,the unity gain bandwidth is 26.7 MHz,and the phase margin 76.3°when the circuit driving a output load of 10 pF∥10 kΩ under 5 V power supply.

Application of the FPGA PS Configured in the Display System

WU Qianke,CHEN Guoqing

. 2013, 26(9):  124. 

Abstract ( 865 )   PDF (790KB) ( 976 )  

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Since it is easy for an FPGA device based on SRAM technology to lose data when it is powered off,in some engineering systems the use of passive configuration is required.This article takes Altera EP4CE6 as an example,using the microcontroller and adopting the mode of FPGA PS configuration on electrical load and remote loaded,which is applied to the display in the remote control system.Practice shows that this solution is simple,reliable and low in cost.

Design of Multi-function High-precision Signal Generator Based on DDS

LIN Chongfeng,LIANG Longxue,SUO Yuntian

. 2013, 26(9):  127. 

Abstract ( 893 )   PDF (852KB) ( 659 )  

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The signal generator is an indispensable tool in the modern electronic measuring,and widely used in the field of communication,measurement and radar control.This paper puts forward a signal generator design method based on DDS technology.The design sets signal parameters by PC and processes the frequency control word by MCU,and then produces sine,square,FSK,ASK and other modulation waveforms.The output frequency is up to 150 MHz and the frequency resolution is 1 μHz.Experimental results show that the design has the advantages of full-function,high-precision and excellent programming capability.

Analysis of Uncertainty Due to Truncation in Planner Near Field Holograms

CHEN Yulin,YU Ding2

. 2013, 26(9):  131. 

Abstract ( 834 )   PDF (616KB) ( 591 )  

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It is necessary to analyze and research truncation error,an error that cannot be ignored in planner near field measurement.To reconstruct antenna aperture distribution and locate defective element and diagnose antenna,this paper analyzes the holograms uncertainty due to truncation.The effect of hologram amplitude and phase on different truncation angle is analyzed by the method of computer simulation.

Design of the VGA Display Controller Based on ADSP BF533

WU Zixian,SUN Hao,PANG Shaolong

. 2013, 26(9):  134. 

Abstract ( 856 )   PDF (502KB) ( 778 )  

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This paper take advantage of ADSP-BF533 and its circuit to communicate with VGA ,the image which is changed into digital signal can be displayed on CRT screen through VGA interface .TIMER interface and PPI interface play the most important role in the DSP.TIMER interface can be configured to generate row synchronizing signal and file synchronizing signal .Weather the two signals are correct is very critical ,The TIMER interface in the pulse with modulation mode can generate row synchronizing signal and file synchronizing signal after a simply configuration .The three primary color signals which the image converts into are output through PPI interface.The digital signals which are output through the two interfaces can be connected to VGA after D/A converting .The test shows that the image can be displayed on the screen.

The Design and Realization of the Data Link Layer  High-speed transmission scheme of the IR-UWB System

CHEN Chen,ZHAO Lijuan2

. 2013, 26(9):  137. 

Abstract ( 914 )   PDF (680KB) ( 672 )  

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A High-speed transmission scheme of data link layer is designed and realized for better reaching UWB technology.Because the wireless channel of UWB sysetm is so unstable and is simplex,that is difficulty for the application layer software development.The papar solve these problems.It can transmit streaming between two computers by IR-UWB system.

Design and Development of Bus ARINC429 Aviation Ground Experimental Platform

ZHANG Rong,ZHANG Pengtao2

. 2013, 26(9):  142. 

Abstract ( 965 )   PDF (1074KB) ( 663 )  

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ARINC429 bus protocol,PCI local bus,SOC and the key technologies such as IP core are studied,based on which multi-channel PCI-based interface ARINC429 bus interface card is designed and implemented to establish a new PCI-based interface ARINC429 air bus ground test platform.Simulation results show that the platform meets the functional requirements of the initial design.

Design of Ethernet-based Bell Ringing System Using the Time Synchronizer

LI Xujun,JIANG Yilong

. 2013, 26(9):  145. 

Abstract ( 656 )   PDF (704KB) ( 487 )  

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Multi-node control system is a time synchronization device based Ethernet,which uses a sever to manage and control time synchronization of all nodes.The time synchronization is designed based on Singlechip C8051F340 and network USR-TCP232-T converter.This system makes use of the original network cable to build the whole control system,and has the advantages of low cost,reliable performance,and simple maintenance.

MODBUS Protocol Network-Based Multi-Fire Monitoring and Control System

HE Lingxiao,LIN Fanqiang

. 2013, 26(9):  148. 

Abstract ( 785 )   PDF (754KB) ( 452 )  

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This article proposes a large-scale monitoring and control network solution.An automatic monitoring and control system based on MODBUS protocol is established,and a long-distance monitoring and control network is set up through Ethernet connection.The fire monitoring and control warning network and MODBUS network system circuit are designed for its application in the measurement and control of fire,and the PCB circuit board is made and networking tested.the MODBUS protocol communications procedures and fire monitoring system of the host computer program are written.The system provides valuable references for early warning and monitoring and control of fires in the complex environment.

Research on Gender Recognition Method Based on Neural Networks

BAI Xue,TIAN Qichuan,HAO Menglin1

. 2013, 26(9):  151. 

Abstract ( 1041 )   PDF (872KB) ( 1150 )  

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This paper introduces the gender recognition method based on neural networks for the difficulty in extracting the human secondary sex characteristics,and the low recognition rate and robustness.We get the gender recognition classifier based on human face images.The face image is processed by the Gauss filter,and then the normalization of preprocessed image is used to train the BP neural network to get the classifier.The gender recognition method is compared with the traditional ones.The experimental results show that the extraction of the human secondary sex characteristics can be automatically done by our method,and the recognition rate,robustness and the fault tolerance are also improved.

Design and Realize of Student Achievement Management System Based on Java

BAO Qian

. 2013, 26(9):  155. 

Abstract ( 1192 )   PDF (657KB) ( 978 )  

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This article based on the Java language and the MYSQL database,on the Eclipse tool developed a student achievement management system which is suitable for college.The major function of this management system is to manage information of students,including manages student's basic information,as well as manages student each semester result,realizes input,renewal,deletion,inquiry,printing and other functions of students information.System has many features,such as has a  beautiful interface,easy to operate,database reserves is big.

Design of the Intelligent Power Platform Base on WebAccess

YANG Yang

. 2013, 26(9):  157. 

Abstract ( 735 )   PDF (701KB) ( 564 )  

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In this paper,a remote control system is proposed based on WebAccess.The design of intelligent power platform is implemented by combining WebAccess,WB1831BX5 power sensor and ADAM4051 digital input module.The system design is described and real-time data acquisition,trend curves,statements and other functions with node configuration and the design of the interface functions are achieved to realize remote monitoring of the regional electricity service,which provides effective and reliable data for service innovation.

H.264 Video Compression System Based on TMS320DM648

LIAO Yi

. 2013, 26(9):  160. 

Abstract ( 874 )   PDF (866KB) ( 652 )  

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In this paper,an H.264 video compression system based on TMS320DM648 is designed.In the video compression system,motion estimation improves image quality with increasing of computational complexity.To solve this problem,the algorithm is improved by incorporating a new motion determination criteria and an adaptive search strategy.Furthermore,program optimization is performed according to the characteristics of TMS320DM648.The simulation results show that the new video compression system can satisfy the requirements of high image quality and real-time performance,and can be applied in media processing.

Realization of 3D Real Terrian Based on OpenGL

LIAO Honggang,LIU Rong

. 2013, 26(9):  164. 

Abstract ( 897 )   PDF (663KB) ( 613 )  

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The basic concepts of OpenGL and the OpenGL programming on the MFC platform are introduced.The combination of MFC with OpenGL can achieve a realistic three-dimensional terrain simulation and human-machine interactive for dynamic terrain visualization.The feasibility of the method is verified by an example.

Application of FPGA in the Data Acquisition System Design

ZHENG Puliang

. 2013, 26(9):  166. 

Abstract ( 779 )   PDF (553KB) ( 602 )  

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Introduces the FPGA as the core logic control module high-speed data acquisition,in the design of the top-down approach was thus characterized the FPGA is divided into several modules.While its overall structure of the data acquisition system and system selection on the main components were analyzed and described in the data acquisition system,FPGA Design.

Method for Uniform Evaluation of LED Unit Board Based on Fourier Transform

HE Jinpeng,LI Yangyang,LIU Gang

. 2013, 26(9):  169. 

Abstract ( 995 )   PDF (775KB) ( 404 )  

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The luminance uniformity is an important indicator in the LED unit board image quality evaluation.The existing evaluation methods have the disadvantages of complicated operation and low accuracy.In this article,the uniformity of the LED unit board evaluation method is improved by using the Fourier transform to make a more reasonable evaluation of the uniformity of the light board.This method considers not only the difference in brightness of the lights point,but also the location of the point of the lights,thus a more realistic evaluation.

Design of and Research on MEMS Gyroscope

LI Lingyu,LU Yi,CHEN Xing,XU Gaobin

. 2013, 26(9):  172. 

Abstract ( 985 )   PDF (1239KB) ( 1062 )  

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This paper introduces the micro electro mechanical systems gyroscope important technology,category,performance comparison and the requirements of the performance parameters in different applications.The latest research results at home and abroad in recent years on the structure of the micro electro mechanical systems gyroscope are summarized.The structure,processing and performance of the micro electro mechanical systems gyroscopes,which are frame type,tuning fork,vibration wheel,vibration ring,rotors suspension,quality block,double vibrating and so on,are analyzed and compared.Emphasis is laid on the micro mechanical gyroscopes' three research difficulties of drift error,precision and packaging technology and the research development trend of high precision,micro machining dimension,structure and circuit optimization,monolithic multi degree of freedom and monolithic integration.

Research on Simultaneous Localization and Mapping Methods of Autonomous Mobile Robot

ZENG Pinshan,MIAO Quanxing,XU Lei2

. 2013, 26(9):  177. 

Abstract ( 1129 )   PDF (601KB) ( 657 )  

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The simultaneous localization and mapping (SLAM) of autonomous mobile robot is the key problem in the field of robot.The two major problems of SLAM are analyzed in this paper,which are the way to describe and process the uncertain information and the method of data association.The implementation methods of SLAM at present are introduced,including the two kinds of kalman filters,particle filter and vision-based SLAM.Finally,by analyzing the different features of each method,further research directions of SLAM are pointed out.

Overview of CAX Technology and Its Integration

ZHANG Honglin

. 2013, 26(9):  179. 

Abstract ( 766 )   PDF (582KB) ( 652 )  

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Based on the research on the present CAX technology and its integration,the concept,working process,application situation and main software of various CAX technology are introduced.The framework and workflow of CAX integration technology are analyzed.Finally,the future trend of CAX technology and its integration are discussed.

MySQL Database-based Optimization

WU Cangzhou,LAN Yizheng,ZHANG Hui

. 2013, 26(9):  182. 

Abstract ( 825 )   PDF (626KB) ( 449 )  

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Common means of optimization of MySQL database at the present stage are summarized.All occasions where the storage engine of MySQL database can be applied and the advantages and disadvantages of indexing mechanism are discussed.In addition,the superiority in the storage process and the importance of hardware performance are analyzed and discussed.On this basis,database segmentation techniques are introduced,and finally the basic method of database sharding and the cluster model is put forward.

Detection of Display Unit Region Defect in LED

FENG Yusen,ZHENG Ruitao,WANG Feng,DU Hongchao

. 2013, 26(9):  185. 

Abstract ( 872 )   PDF (805KB) ( 654 )  

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On the market of LED display,because of the problem of heat dissipation and aging,leading to display images appear display defect.And to defect detection by experienced operators through the eyes to finish,it was difficult to ensure that the efficiency and accuracy.In this paper,through the method of template matching by regional location and point positioning to extract the image of light intensity information,redraw the light point diagram,then based on the least square method of polynomial surface fitting method for surface defect separation,the results of experiment can effectively and accurately detect the display defect.It's has important significance for the LED display defect areas.