Table of Content

15 July 2014 Volume 27 Issue 7

  

Articles

VLSI Implementation of Fast Half-Pixel Interpolation Algorithm Based on H.264

SONG Yukun,CHEN Xiaobo

. 2014, 27(7):  1. 

Abstract ( 766 )   PDF (881KB) ( 602 )  

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A fast interpolation VLSI hardware architecture based on half-pixel is proposed to reduce the half-pixel motion estimation complexity for its full use of process data.ALTERA FPGA platform is employed for validation,which shows that the system runs stable at 135 MHz with the ability of encoding a high resolution video of 1080P@25fps in real time,which meets the requirement of real time video encoding and decoding.

Application of HART Protocol in Dust Monitor

YANG Muxin,WANG Ping

. 2014, 27(7):  5. 

Abstract ( 535 )   PDF (608KB) ( 608 )  

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The low efficiency of traditional dust instruments maintenance and management has a negative impact on the production.The use of HART (Highway Addressable Remote Transducer) protocol as dust analyzer and host computer communication protocols is proposed.HART protocol communication is achieved by improving the existing dust concentration transmitter.Experimental results show that the proposed dust instrument improves in terms of efficiency of maintenance,management and fault diagnosis.

A Smooth Handover Method for Dynamic Coalition of Mobile Target Tracking in WSN

GU Hanjie,DU Qingwei,LI Weiwei

. 2014, 27(7):  8. 

Abstract ( 968 )   PDF (961KB) ( 559 )  

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The traditional discrete formation of dynamic coalition has large energy consumption and the historical information is often lost.A new smooth handover method for dynamic coalition is put forward to improve the above defects.Firstly,the next position of the mobile tracking target is estimated.After that,the trigger condition of the coalition handover is detected.Finally,smooth transition of the coalition is realized by processing a series of actions:the selection of coalition head,the switch between former and new coalition head,and the alteration of coalition members.Moreover,the repair mechanism is proposed in case of the track loss.This method will help avoid the repeating formation and dissolution of dynamic coalition and keep updating historical information collected by the former coalition.Simulation results indicate that the dynamic coalition achieves smooth handover and is maintained effectively.Compared with the traditional method,it reduces the cost of energy and network communication and improves the precision of tracking.The validity of the method is verified.

A WSN Node Deployment Algorithm for Airport Noise Monitoring

XU Jingjing,CHEN Bing,QIAN Hongyan

. 2014, 27(7):  14. 

Abstract ( 666 )   PDF (746KB) ( 587 )  

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The paper proposes a WSN node deployment algorithm (Genetic Algorithm Optimize Deployment Algorithm based on Single Aircraft Noise Event,named SANE-GAODA) to meet the demands of low cost and high precision airport noise monitoring systems.The cover connected set is designed by introducing single aircraft noise event with regulated constraint functions;the elite retain mechanism is adopted to increase the speed of optimization;and the idea of uniform design method is introduced to achieve the effective local search.Simulation results show that the optimal coverage set of nodes with less nodes and higher coverage percentage of airport noise events are achieved by the proposed algorithm.

Performance Comparison of MUSIC Algorithms

YUAN Ziyue,YANG Guo

. 2014, 27(7):  19. 

Abstract ( 1200 )   PDF (565KB) ( 679 )  

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One of the core technologies of smart antennas is DOA estimation (DOA),which is of great significance in wireless communications.MUSIC algorithm is a classic DOA estimation algorithm,which has large amount of computation and an inability to distinguish coherent signals with small SNR.Some improved algorithms are proposed.This paper studies the Root MUSIC algorithm,MUSIC algorithm based on spatial smoothing techniques,improved MUSIC algorithm and modified MUSIC algorithm.The effect of the angle interval,SNR and signal coherent on the resolution of the improved MUSIC algorithm is analyzed by simulation.The proposed improved MUSIC algorithms enhance the advantages in high resolution for applications in smart antennas.

Combination of Single Point Positioning Model and Algorithm Based on GPS and the Beidou Satellite Navigation System

HUANG Lixia

. 2014, 27(7):  23. 

Abstract ( 795 )   PDF (533KB) ( 540 )  

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The Beidou satellite positioning system can provide rapid and high precision satellite positioning of simple digital message communication to the user by simple and practical algorithms,so as to provide effective assistance in the localization of GPS navigation system.A combination of the two positioning model is built based on an analysis of the single point locating principles of GPS and Beidou combined satellite navigation system.The effectiveness of the proposed algorithm is verified.

Design of Gigabit Ethernet Based on SOPC

GONG Feng,LI Huang,CHEN Yanhua

. 2014, 27(7):  26. 

Abstract ( 854 )   PDF (568KB) ( 614 )  

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The implementation of gigabit Ethernet based on SOPC is discusses for system integration and networking of modern industry.CycloneIII series of FPGA provided by Altera is used as the platform,on which the NiosII processor system is built.The triple speed Ethernet megacore provided by Altera is adopted to implement the gigabit network MAC layer.Finally,the transmission of data with UDP protocol is realized.

An Algorithm for IF BPSK Signal Demodulation Based on Software Radio Technology

XU Jiajia,XU Ming

. 2014, 27(7):  30. 

Abstract ( 669 )   PDF (526KB) ( 570 )  

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A demodulation algorithm for IF Bipolar Phase Shift Key (BPSK) signals based on software radio technology is proposed.Baseband elements are phase demodulated,frequency and phase synchronization is realized by repeated adjustments of phase threshold method,and finally symbol synchronization is fulfilled by a simple convolution operation.The algorithm is simple and real-time,and can be used in pipeline structure.Different from conventional methods,this algorithm consists mainly of arithmetic and logic judgments of complex signals.It is to realize the algorithm on FPGA device using software radio technology.

Algorithm for Elimination of the High-low Intensity Light in Video Based on Improved AHE

SUN Yushu,ZHANG Huafeng,JIANG Yongli,YU Yongfang

. 2014, 27(7):  33. 

Abstract ( 828 )   PDF (618KB) ( 602 )  

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Cameras used to monitor the south line expressway tunnel of the Hangzhou Bay Bridge are heavily influenced by the high-low intensity light.This paper proposes improved adaptive histogram equalization (AHE) to address the problem.First,the sliding window size and AHE parameters are set according to the actual video effect.Then the sliding window is convolved with one of the video channels using improved histogram equalization equation.Finally,the other 2 channels are further convolved by this method.Results show that this algorithm can effectively eliminate the high-low intensity light,enhance the image quality,and facilitate further object tracking and classification.

Orthogonal Basis Decomposition Algorithm Based on Aeromagnetic Exploration

YANG Yong,CHEN Zhengxiang

. 2014, 27(7):  36. 

Abstract ( 692 )   PDF (875KB) ( 582 )  

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The submarine target is regarded as the magnetic dipole on the magnetic anomaly detection (MAD) in aeromagnetic survey.An orthonormalized functions decomposition algorithm is proposed to increase SNR prominently in detecting target magnetic signals.The position,the velocity and the course of the submarine target can be obtained by the double L detection method.The simulation demonstrates the method has good effects.

Quantum Reversible Logic Circuits Synthesis Based on Q-M Algorithm

YANG Huan,ZHAO Shuguang

. 2014, 27(7):  40. 

Abstract ( 609 )   PDF (488KB) ( 572 )  

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Combination (simplify) criteria is presented,thereby modifying the Q-M algorithm source code which results in ESOP expression.According to the criteria,the conversion of irreversible operation to reversible operation is implemented successfully.The Q-M algorithm used in conventional logic synthesis is transplanted into reversible logic so as to construct reversible logic circuits by using the reversible logic gates.

DOA Estimation of LFM Signal Based on Subspace Matching Pursuit

LIU Lu,NIE Min

. 2014, 27(7):  43. 

Abstract ( 777 )   PDF (610KB) ( 586 )  

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A DOA estimation of LFM signal based on subspace matching pursuit is purposed to deal with the large sampled data in the estimation of LFM signal and unsatisfactory estimation under low signal noise ratio.The subspace matching pursuit arithmetic projects the signal on the subspace,calculates the maximum projection,and finally estimates the DOA of the LFM signal.This arithmetic also improves matching pursuit arithmetic and decreases the over matching phenomenon.Simulations show that the number of over matching by the subspace matching pursuit arithmetic is much less than that by the matching pursuit arithmetic,and the DOA are estimated under low signal noise ratio.

Implementation of a Radar Testing Software Based on Matlab GUI

DONG Jin,XU Wei,JIANG Ming

. 2014, 27(7):  47. 

Abstract ( 638 )   PDF (959KB) ( 574 )  

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Software based on Matlab GUI for radar testing is designed and implemented,which can send test commands,collect status information,analyze sample data and display the answer by using signal processing tool-box,plotting function and graphical user interface programming in Matlab.By this method,software can be developed rapidly with much ease,and the efficiency and quality of radar testing are greatly improved.

Research on Dynamic Accuracy in High Precision Measurement Radar

JIANG Laichun

. 2014, 27(7):  51. 

Abstract ( 638 )   PDF (611KB) ( 550 )  

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High precision measurement radar dynamic accuracy is one of the important indicators of shooting range of measurement and control system.The dynamic measurement accuracy evaluation is adopted in the accuracy calibration flight test to address the problem of range measurement and control equipment with precision.Its principles are analyzed and the feasibility of the high precision measurement radar dynamic accuracy analysis is proved by data validation.Some suggestions on future researches and problems of its applications are pointed out.

Simulation and Analysis of Dispersion Characteristics of Warhead Fragments in Radar Beam

LI Xinxin,HUANG Wei

. 2014, 27(7):  54. 

Abstract ( 642 )   PDF (879KB) ( 557 )  

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The dispersion characteristics of warhead fragments in radar beam are simulated and analyzed using Matlab based on an analysis of the typical dispersion characteristics of warhead fragments to evaluate the efficiency of warhead fragments using radar.The processing model and simulation results are given.The results show the feasibility of warhead fragments measurement using radar to evaluate the efficiency of warhead fragments.

Design of a Car Guidance Control Information Data Processing System Based on DSP

LIU Bing,SUN Aizhong,FAN Xiufeng

. 2014, 27(7):  59. 

Abstract ( 716 )   PDF (707KB) ( 529 )  

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In-vehicle systems are necessary for obtaining traffic information in driving.This paper presents the design and implementation of a navigation system based on TMS320C6713B DSP,with its hardware design given.The system has the features of good reliability,simple operation,and easy maintenance.

Design and Simulation of FIR Digital Filter Based on FPGA

YE Yadong,LIN Zhiting,FAN Yuhong

. 2014, 27(7):  67. 

Abstract ( 696 )   PDF (781KB) ( 585 )  

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A 16 taps FIR digital low-pass filter is designed,whose performance is improved by parallel distributed arithmetic.The FDATool of Matlab is used to design the filter coefficients.The sub module and system module are designed with Verilog HDL and Block Diagram respectively.Simulation with Matlab and QuartusII show that the designed system has stable performance,good effect and strong applicability.

Design of a Broad-band Interdigital Microstrip Bandpass Filter

LIU Haiqiang,ZHOU Lixue,LI Liang

. 2014, 27(7):  71. 

Abstract ( 1147 )   PDF (800KB) ( 761 )  

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The basic principles of Interdigital microstrip bandpass filter are expounded.Then a brief example of designing a broad-band filter with the frequency from 7.0 to 10.3 GHz is proposed by using Agilent ADS and Ansoft HFSS.An FBW of 38.2% with low insertion and high isolation is achieved.The filter is fabricated,and the simulated and measured results are found to be in acceptable agreement with each other.

Design and Analysis of the EMC of a Digital Controller

YANG Ning

. 2014, 27(7):  74. 

Abstract ( 580 )   PDF (604KB) ( 570 )  

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This paper introduces EMC design in digital circuit.Based on an analysis of the structure,sources of interference and transmission traces and characteristics of a controller,the EMC system design,structure design,filter design and grounding design are improved.A comparison between the frequency charts before and after the design proves the feasibility and correctness of the imroved desgin.

Thermal Design and Implementation of a Module with High Heat-Flow Density

ZHANG Fenghua,TIAN Feng,ZHOU Yao

. 2014, 27(7):  77. 

Abstract ( 651 )   PDF (722KB) ( 534 )  

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Thermal designs have direct impact on the performance of integrated modules because of their high heat-flow density.The sandwich structure is determined by simulation to enhance heat-transfer pathway.The temperature-rise pathway of the module is tested.A method for reducing contact thermal resistance by filling up aluminum foil between slot and filling up chill bar between chip and shell is presented which meets module performance requirement and provides reference for similar module.

Optimal Duty Cycle Control Based on Chopper Circuit

LU Zhengtong,ZHAO Fengyin

. 2014, 27(7):  80. 

Abstract ( 575 )   PDF (612KB) ( 565 )  

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The common chopper circuit is studied with analysis and calculation of its current,voltage and power,each of which is represented as the duty cycle D.The extreme duty and scope of the above elements are analyzed to show the impact of the duty cycle on the optimal control and performance of the device,which provide users with more choices in selecting circuit devices.

Design and Realization of a Comb Generator Based on the Simulation of ADS

LAI Hanyu,LI Guangcan,DU Yong

. 2014, 27(7):  84. 

Abstract ( 1168 )   PDF (569KB) ( 677 )  

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The comb generator is widely used in microwave frequency synthesizers.In the paper,a comb generator with 100MHz input signal and 0.1~4 GHz output signal is designed based on high non-linear characteristic of step recovery diode.The initial value is calculated theoretically and the schematic is simulated and optimized by ADS.A large number of experiments show that rich harmonics are generated in the range of 0.1~4 GHz by the comb generator.

Design of a V Band Waveguide to Microstrip Probe Transition

WANG Jie,SONG Zhidong,ZHANG Juan,ZHAN Ting

. 2014, 27(7):  87. 

Abstract ( 663 )   PDF (656KB) ( 485 )  

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This paper presents the design of a V-band E-plane transition by high frequency simulation software HFSS.A back to back structure sample is fabricated,and the measurement results show that insert loss is less than 0.5 dB at frequencies from 50 GHz to 60 GHz.

Power Down Protection Design for F-RAM Based on FPGA

REN Zeyu,GUO Pengcheng,WANG Jianchao,LUO Dingli

. 2014, 27(7):  89. 

Abstract ( 662 )   PDF (1047KB) ( 526 )  

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The F-RAM is required to record important data in experiments under complex conditions.The power down protection function is necessary to prevent the already valid data from being covered on secondary electricity.A design of a power down protection is introduced and realized on FPGA.The design works well on board,and realizes the expected function in related project applications.

Design of the SCM Based on the GPS and CDMA Dual Timing System

HU Shanwei,WANG Zhiqiang,ZHANG Shoupeng

. 2014, 27(7):  93. 

Abstract ( 843 )   PDF (509KB) ( 631 )  

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A GPS and CDMA double reception timing system based on the MSP430 MCU is proposed,the design ideas and methods are described,and the hardware circuit and software flowchart are presented.The system use GPS and CDMA clock signals,which can automatically adjust the time with the advantages of multiple guarantees on time accuracy,consistency,high reliability,and strong adaptability to the environment.

Shaft Angle Position Signal Detection Using the Rotary Transformer

AI Li,YANG Henghui

. 2014, 27(7):  96. 

Abstract ( 628 )   PDF (522KB) ( 772 )  

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A rotor position detection method is studied,which converts rotor position to digital quantity by using resolver-to-digital converter AD2S90.On the basis of the working principles of the rotating transformer,this paper introduces the working principle of the system based on AD2S90,related interface circuit,and detection circuit implementation.The experimental results show that the system design is reasonable and reliable,and the digital position detection circuit composed of rotary transformer and AD2S90 is feasible.

Design of Hardware Image Binarization Based on CMOS for Digital Cameras

LIU Zuchen

. 2014, 27(7):  99. 

Abstract ( 804 )   PDF (624KB) ( 552 )  

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The image binarization of CMOS-based digital cameras mostly collects data via the parallel I/O port of a digital camera and refers the binarization process to MCU,which occupies the MCU with enormous data and slows down the transmission and processing.In this article,extra hardware and logic circuit are utilized for image binarization and compression to reduce the occupied internal storage space,shorten the time of transmission and software processing and improve the real-time performance in system detection.

An Engineering Realization of an Instantaneous Frequency Measurement Receiver by the Phase Comparison Method

XUE Mingjun,KONG Xianhui,ZHANG Hongmei

. 2014, 27(7):  103. 

Abstract ( 744 )   PDF (659KB) ( 453 )  

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The RF signal is divided into two part signal via limiter,amplifier and splitter.The first part signal is delayed by a special length RF cable.The delayed part signal and another part signal are delivered to orthogonal phase discriminator together and generate sin,cos analog signals.The sin and cos analog signals are the function of input RF phase and frequency.The two analog signals are changed to digital by A/D converter and fed to FPGA.The FPGA outputs frequency code by estimating,calculating and coding,thus realizing frequency measurement.

Data Record and Analysis Based on the Embedded DSP System

LIU Haihong

. 2014, 27(7):  106. 

Abstract ( 520 )   PDF (551KB) ( 615 )  

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Data are lost when the embedded DSP system powers off,but it is desired to record the status and data information generated in the working process for further analysis in many situations,such as system failures.A hardware and software design based on the electrically erasable and programmable memory AT28C010 in the DSP system is described in detail to realize data recording and analysis for further analysis and failure location.The design is simple and flexible in recording modes with good value in engineering applications.

An Improved Design and Implementation of Software-hardware Cooperation Verification Platforms

WEI Wenqiang,DU Huimin

. 2014, 27(7):  109. 

Abstract ( 552 )   PDF (660KB) ( 655 )  

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As the most popular methods of verification,assertion-based verification and formal verification can ensure the circuit working normally.Although the circuit by this method satisfies the requirements of designer,it cannot be tested completely without error.In this paper,a software-hardware cooperation verification platform is presented,which increases the speed and reusability of verification using hardware accelerator and object-oriented verification.The experimental results show that the verification efficiency and coverage improve three to ten times in complex circuit verification.

An Exception Handling Design and Implementation Based on the ARM Processor

XIANG Tao,HUANG Baolei

. 2014, 27(7):  113. 

Abstract ( 527 )   PDF (575KB) ( 699 )  

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Embedded operating systems require quick response to processor exceptions and interrupts.The features of exception handling under ARM architecture are analyzed and an efficient exception handling solution based on arm processor is put forward.This solution is designed and implemented on LPC3250 hardware platform.Experiments show that the proposed scheme is efficient in exception handling.

Design of an Acquisition System for Portable and Low-power ECG Based on the ADS1293

HE Lingli,WANG Yufeng,ZHU Yuanzhong,HE Wenjing

. 2014, 27(7):  117. 

Abstract ( 864 )   PDF (545KB) ( 879 )  

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An ECG signal acquisition system based on ADS1293 is designed to realize real-time acquisition of the ECG signal from human body.The system consists mainly of the signal acquisition module ADS1293 and the main control module MSP430.The analog-to-digital conversion of ECG signal is executed by 24-bit high-precision chip ADS1293.The converted signal is sent to the MSP430 for analysis via SPI,and then transmitted to portable monitor by USB.The system has the characteristics of ultra-low power consumption,small size and portability.

Research on Control Techniques for Grid-connected Inverter Photovoltaic Systems Simulation

LIN Tao,WANG Yanzhang

. 2014, 27(7):  120. 

Abstract ( 709 )   PDF (809KB) ( 583 )  

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The double-loop control strategy is adopted to address open-loop inverter waveform distortion.The single-phase half-bridge inverter and three-phase half-bridge inverter in open-loop and double loop control conditions are simulated with Matlab.The results validate the superiority of double-loop control inverters.

Interactive Infrared Image Processing Based on FPGA

LI Qiang,HE Bingyang

. 2014, 27(7):  122. 

Abstract ( 538 )   PDF (734KB) ( 575 )  

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An infrared image interactive processing FPGA implementation is proposed based on a study of the principles of brightness and contrast adjustment and the definition of image polarity.The brightness information of the infrared image is extracted using matlab software into the storage module.the image polarity switching and multi-gear adjustment of the brightness and contrast are achieved with three steps using Verilog HDL hardware programming:the image reading,interactive processing,and VGA display.Quartus II software is used to compile the program,and the system is tested on the Altera DE2 development platform to verify the feasibility of the program and to achieve the desired effect.The system also enables thermal imager control function simulation,and the simulator for the development of the thermal imager provides a theoretical basis and reference solutions.

Effect of Temperature on the Warpage and Deformation of Different Thickness Light Guide Plate

SU Shihu

. 2014, 27(7):  127. 

Abstract ( 753 )  

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Application development in large size side light type LED backlight source for the purpose,to three kind of different thickness of light guide plate respectively in the light guide plate by cutting and polishing machining,printing dot after high temperature test,three conditions of the maximum warpage were studied.Test temperature of 60 ± 2 ℃,humidity is 50% ± 10%RH,test time is 24 hours,the light guide plate samples and mass production of light guide plate,results show that the light guide plate is thin the warping deformation affected by temperature increases,but the light guide plate is easy to recovery after deformation.

Design and Implement of a Submerged Arc Furnace Electricity Data Management System

ZHENG Xianlei,QIAO Gangzhu,ZENG Jianchao,QIE Wenke

. 2014, 27(7):  130. 

Abstract ( 699 )   PDF (1006KB) ( 624 )  

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An electricity data acquisition and management system based on VB 6.0 and MySQL database software is presented for the transmission,storage and display of large amount of electricity data collected in the operation of the furnace.The principles and method of large data storage and display are introduced,and the design ideas and realization of each module of the systems are described in detail.The laboratory tests show that the system can meet the requirements of the speed of current data acquisition and storage in the submerged-arc voltage control.

Emotion Classification of the Micro Blog Comments Based on Tongyici

YANG Xia

. 2014, 27(7):  134. 

Abstract ( 567 )   PDF (552KB) ( 500 )  

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Emotion classification of the micro blog comments is of great significance for micro blog monitoring,and discovery and guiding of public opinions.The motion dictionary of Tongyici Cilin based on the constructed Chinese micro-blogging emotional corpus is introduced to classify emotions.A comparison between  results with and without the use of Tongyici Cilin shows that the introduction of Tongyici Cilin improves the accuracy of classification.

AdaBoost Face Detection Based on LARK Feature Extraction

WANG Yin

. 2014, 27(7):  137. 

Abstract ( 654 )   PDF (869KB) ( 551 )  

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As the images are vulnerable to external conditions and image background in the imaging,some non-face images are classified as face images by a single classifier in AdaBoost face detection.And for feature classification,it is difficult to detect face images by using a single classifier.This paper studies the AdaBoost face detection and uses LARK for feature extraction to construct a face system,which efficiently improves the accuracy of face detection.

Parallel Algorithms for Single Fault-tolerant Erasure Code in Network Storage

GUO Jianqi

. 2014, 27(7):  141. 

Abstract ( 664 )   PDF (571KB) ( 542 )  

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Redundant data encoding is recognized as a good method for improving storage system reliability.This article studies the algorithms of erasure code.For encoding (initial synchronization) and decoding (error disk's reconstruction) operations of the single fault tolerance network disk array,this article focuses on RAID5 (parity),and proposes more efficient distributed and parallel algorithms on the basis of the original collective algorithm.The experimental results shows that algorithms based on group algorithm are much more efficient.

Design and Implementation of a NAND Controller Based on FPGA

JI Jin

. 2014, 27(7):  144. 

Abstract ( 915 )   PDF (686KB) ( 464 )  

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In the development of NAND type solid storage system,interface chip directly affects the performance of the storage system,and an independent design of NAND controller is needed in order to maximize the performance of reading and writing.The structure of interface characteristics of NAND Flash and NAND controller is analyzed,the main logic of NAND controller and the common programming commands are described using the state machine,and the state machine logic is realized by the use of FPGA.Simulation test on the NAND main operation command shows that the design meets the requirements of NAND Flash operation timing.

Control Interface Software Design for the Special Signal Generator Based on LabVIEW

LIAO Haiqian

. 2014, 27(7):  148. 

Abstract ( 599 )   PDF (906KB) ( 611 )  

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Control interface software of a special signal generator is designed on software develop platform LabVIEW.The control interface software consists of the parameter settings,signal generation,and instrument communication modules.The experimental result shows that the method is simple,reliable and less demanding on hardware.

High-Speed Image Acquisition and Real-time Processing System Based on Zynq-7000

YANG Xiaoan,LUO Jie,SU Hao,BAO Wenbo

. 2014, 27(7):  151. 

Abstract ( 866 )   PDF (724KB) ( 920 )  

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Zynq-7000 series all programmable SoCs by Xilinx use dual microprocessor and programmable logic structure.An image acquisition system is built using the programmable logic unit,and a Linux operating system is built for real-time image processing using the Cortex-A9 dual-core processor with WIFI for interaction.The method of high performance image processing on the platform is introduced,providing a feasible design of high performance image processing applications for small robots.

Design of a Car Control System Based on Bluetooth

ZHAO Xiaofeng,ZHANG Shun,ZHOU Jingyu,ZHONG Xiaoling,HE Lingxiao

. 2014, 27(7):  155. 

Abstract ( 825 )   PDF (729KB) ( 547 )  

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A small trolley system based on Bluetooth chip is designed with an MCU as the control core.Eclipse and Arduino programming is used for information collection,driver and speed control,and the communication between Bluetooth mobile client-side and Bluetooth car server-side is realized via serial port emulator.The movement of car is controlled by Driver L298N,and the speed by the bipolar type H reversible PWM converter.The HD camera installed in the car sends back real-time video and pictures by wireless transmission.The whole system is simple in circuit structure and reliable in performance is high with a complete software and hardware.It can operate automatically in pre-set modes in an environment,making it suitable for scientific exploration.

Implementation of 3G Network Video Transmission Based on Davinci Technology

LI Yang,XI Zhihong

. 2014, 27(7):  159. 

Abstract ( 682 )   PDF (779KB) ( 596 )  

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A method for 3G wireless network video data transmission is given.The dual-core DM3730 based on DaVinci technology is adopted as the hardware video processing platform.Multimedia framework based on the assembly line of GStreamer is used.The video capture,H.264 compression and 3G wireless network transmission function are realized.The advantages of the method lie in low power consumption,small size,and scalability.

Design of Greenhouse Parameters Monitoring System Based on ZigBee

LV Xiaozheng,FENG Minsheng

. 2014, 27(7):  162. 

Abstract ( 780 )   PDF (618KB) ( 526 )  

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A project for detecting the ambient environment parameter with the help of ZigBee technology is put forward so as to improve the efficiency of agriculture productivity and solve such problems as the low automatic level in the environment detecting in the greenhouse.This project uses the cc2530 manufactured by TI as the main controller and the auxiliary detect circuit is made up of numerous environment parameter sensors.Software and hardware designs are given.Tests show that the project is stable with low power dissipation and high automatic level.

Massive Data Preprocessing and Storage Strategy for Bridge Health Monitoring

LI Xuexue,PENG Zhenrui

. 2014, 27(7):  165. 

Abstract ( 519 )   PDF (581KB) ( 499 )  

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In order to solve the problems of the massive data preprocessing and storage about the bridge,we propose a data preprocessing and storage model for bridge which combines the advantages of the concept of distributed processing of large data,the data stream sliding window technology and wavelet packet processing for noise reduction.The model not only saves the raw data of bridge monitoring and integrate the data preprocessing into their storage,but also alarms when the sensor is stop working.The results show that it is feasible to apply the model in massive data preprocessing and storage in bridge health monitoring.

Binocular Vision and its Application in Full-automation Robots for Changing Cell

ZHANG Dongdong,LI Hanzhou

. 2014, 27(7):  168. 

Abstract ( 676 )   PDF (827KB) ( 357 )  

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The principles of binocular stereo vision are introduced in this paper,and then binocular stereo vision technology is used to meet the localization requirements of the cell surface during the fully automatic changing cell for electric vehicle.Zhang Zhengyou calibration method is used to complete camera calibration and the regional matching principle to match feature points for the three-dimensional reconstruction of the cell.Experimental results show that the accuracy of binocular vision location meets the requirements for the changing cell.

A Drowning Feature Recognition System Based on AIS

GUO Changsheng,GONG Tao,FAN Tiantian,ZHENG Huake

. 2014, 27(7):  171. 

Abstract ( 938 )   PDF (1036KB) ( 341 )  

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A wireless drowning features recognition system is designed to meet the application requirements of automatic monitoring swimming states.The system is not only capable of real-time monitoring of the status of swimmers accurately and automated without affecting normal swimming,but also of abnormal alarms.The system hardware consists of signal acquisition and pre-processing module,a wireless transmission module and control module.The main part of the algorithm contains serial data receiver module,data preprocessing module,drowning feature recognition module and the control module.Drowning feature recognition module is based on the artificial immune clonal selection algorithm,which has a natural recognition features pattern that can easily extract features that are difficult to extract by other recognition algorithms.Experiments show that the system can accurately and quickly identify the characteristics of non-drowning and drowning.

Design and Realization of the Test Equipment of a Data Chain General Information Computer

ZHANG Yang

. 2014, 27(7):  177. 

Abstract ( 646 )   PDF (574KB) ( 464 )  

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The test requirements of the test equipment of Data Chain General Information Computer are analyzed,and a test equipment of General Information based on module of PC and the software based on VC++ is designed.The equipment testing has two parts:the auto test on general information computer functions,and test on general information computer function in practical connection.The testing results are displayed by report forms.

Research on Stochastic Resonance and its Development

ZHANG Siqian,QIU Xiaohua,PENG Yueping

. 2014, 27(7):  179. 

Abstract ( 963 )   PDF (616KB) ( 589 )  

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Stochastic resonance is a common optimal response phenomenon caused by the noise in the nonlinear systems.The theory and research findings of stochastic resonance have been used in many fields.Stochastic resonance shows the good aspect of noise,which is different the traditional viewpoint that the noise is harmful to the useful signal.In the paper,the recent research findings of stochastic resonance are reviewed in detail,and its future development is also discussed.

Application of the Dynamic Positioning System in the Offshore Engineering Vessel

HAN Yi,WANG Wei,ZENG Dexiang

. 2014, 27(7):  182. 

Abstract ( 537 )   PDF (744KB) ( 523 )  

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The article introduces the development and the present status of dynamic positioning system (DPS) for offshore engineering vessels in China.The control technique and basic framework of DPS are analyzed.The difficulties in control technique of dynamically positioning system are pointed out and analyzed.

Machine Vision and Applications

GUO Jing,LUO Hua,ZHANG Tao

. 2014, 27(7):  185. 

Abstract ( 1120 )   PDF (733KB) ( 637 )  

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Machine vision is a multidisciplinary research with the advantage of non-contact,real-time,automated,intelligent operation,and with broad application prospects.In this paper the system structure and the key technologies of machine vision are introduced.The history of the development of machine vision in China and abroad is reviewed.And the development trend of machine vision is analyzed.Finally the machine vision applications in various fields in China and abroad are discussed.