Table of Content

15 January 2015 Volume 28 Issue 1

  

Articles

Design of Radar Signal Analysis Software Based on LabWindows/CVI

LEI Yu,ZHANG Linrang,MIAO Xueping

. 2015, 28(1):  1. 

Abstract ( 509 )   PDF (844KB) ( 569 )  

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This paper presents a design idea of radar signal analysis software with a multi-domain conjoint analysis function based on virtual instruments in view of the single function,inconvenient use of the traditional signal analysis instrument existing in the analysis of complex radar signal.Firstly,the structure of software and the function of each module are described briefly,and then the software design based on LabWindows/CVI is brought forward in details.Finally,a widely-used linear frequency modulation signal is used to validate the reliability and practicality of the software.Compared with the similar software,the radar signal analysis software has the advantages of easy operation,small error,high precision,easy upgrade,and one-touch analysis on various radar signals.

Design of 2ED020I12-F2-based IGBT Driving Circuit

MA Lixin,FEI Shaoshuai,ZHANG Haibing,LUAN Jian

. 2015, 28(1):  5. 

Abstract ( 669 )   PDF (799KB) ( 681 )  

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ICs 2ED020I12-F2 is designed and the working process of 2ED020I12-F2 driving circuitry is analyzed in detail.The principle of 2ED020I12-F2's switching and over-current protection is researched.Finally,2ED020I12-F2-based IGBT driving circuitry with transformer isolation and self-power supply function are designed and optimized.Tests verify the correctness and reliability of the driving circuit.

Study on the Net-booting of Multi-DSP Signal Processing System Based on Rapid IO

LI Erxiao

. 2015, 28(1):  8. 

Abstract ( 633 )   PDF (673KB) ( 507 )  

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To multiple processors,strong real-time radar signal processing system load characteristic,studied many TS201 signal processing system of network load method.This paper proposes an efficient network load method,fully considering the system bus at work load and the complexity of the loading paths.This approach is simple,loading paths and rapidity,effectiveness of the presented approach are verified through engineering application.

Implementation of Reversible Logic Gates Evolutionary Design Approach Based on CUDA

YU Jinglong,ZHAO Shuguang,WANG Xiang

. 2015, 28(1):  12. 

Abstract ( 579 )   PDF (809KB) ( 638 )  

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Optimization of the reversible logic gates will directly affect the overall optimization of reversible logic circuits.Existing optimization methods fail to achieve the overall optimization.Based on NCV gate library,the genetic algorithm coding schemes and fitness are improved to some extent,and the evolutionary design is upgraded to CUDA-based parallel algorithm,which is applied to the optimization of the reversible logic gates.This method not only gives full play to the overall optimization of the evolutionary design of circuit,but also significantly speeds up the circuit search without scaling up the size of hardware.

Design of Frequency Response Analyzer Based on DSP

LI Yao,SUN Yuanyuan,MA Zewei

. 2015, 28(1):  16. 

Abstract ( 567 )   PDF (876KB) ( 523 )  

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A design of low-cost and low-band frequency response analyzer is presented by analyzing the techniques of frequency characteristics analysis.The system control software and FPGA control logic are given and the data-processing function of amplitude and phase-frequency testing are achieved.The method for testing the typical transmission network is designed to compare with amplitude-frequency characteristics of the standard filters.The results show that requirement of the design is met.

Design of A Novel Buck Synchronous Rectifier Switch Power Supply

WANG Fuqiang

. 2015, 28(1):  20. 

Abstract ( 582 )   PDF (743KB) ( 1250 )  

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A novel switch power conversion circuit based on synchronous rectification and ZVT soft switching technology has been successfully designed.In order to achieve synchronous rectification,the low-resistance MOSFETs are used instead of the diode.It is realized that switch tube turn-on or turn-off under conditions of zero voltage or zero current by using soft switching technology.The simulated characteristics of topological structure are simulated by using PSIM software.The results show that the overall efficiency of the converter is improved effectively and the wastage of the physical device is reduced as well.

Research on and Implementation of DDC in Automotive Radar Signal Receiver

XU Weisheng

. 2015, 28(1):  24. 

Abstract ( 682 )   PDF (1015KB) ( 503 )  

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Since the center frequency of the radar signal is far greater than the signal bandwidth,automotive radar signal receiver radar's baseband signal is obtained through DDC.A signal receiver is designed with a AD chip sampling radar signal and DDC in the FPGA.A DDC algorithm is designed based on polyphase filter structure to meet the design requirements.The theoretical study and analysis of the algorithm is made through Matlab,and simulation and implementation in FPGA is performed.The results show that the designed DDC algorithm can accurately obtain the baseband signal with simpler radar signal receiver for further improvement of the radar signal receiver system.

Effects of Carrier Frequency of Radiation Source on Bearing-only Location

LIU Yang

. 2015, 28(1):  29. 

Abstract ( 627 )   PDF (514KB) ( 535 )  

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This paper analyzes the basic principle of the three-dimensional Crossing Location,and derives a quantitative expression of location error.For different direction finding systems,such as amplitude comparison direction finding and interferometer direction finding,the relationship between the carrier frequency of radiation and angle measurement accuracy is analyzed,and then a quantitative relationship between the carrier frequency of the radiation source and the location error is established.The simulation analysis shows that the detected can increase carrier frequency to avoid being located precisely,which has application value.

Design of a Radar Signal Simulator Based on BF533 and FPGA

SHI Gaoyang,HU Zhaofeng

. 2015, 28(1):  32. 

Abstract ( 722 )   PDF (891KB) ( 573 )  

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A design of the radar signal simulator based on BF533 and FPGA is advanced.The project adopts ARM input radar parameters,and transmits the data to DSP through high speed USB interface.The parameters are processed by DSP and passed to the direct digital frequency synthesizer implemented by FPGA to synthesize various models of radar echo signal.

Design of Control Unit of Distributed Jammer Based on ARM

XU Tong,ZHANG Lingyu

. 2015, 28(1):  36. 

Abstract ( 609 )   PDF (859KB) ( 504 )  

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For easier and more efficient control over and use of distributed jammers,a solution based on ARM and large-size touch screen is proposed and the function design of the unit is given.The platform for development is Linux Fedora 9 unit,based on Micro2440 development boards and 7-inch touch screen released by Friendly Arm.The control over distributed jammer using ARM and its touch screen is completed by the development of the SPI interface driver,interface design of RS232 and SD card,interface design of jammer control unit and the realization of the function of control unit.

Simulation and Analysis of Jamming on AM Communication Signals

TONG Qiao,ZHANG Hu

. 2015, 28(1):  41. 

Abstract ( 581 )   PDF (489KB) ( 483 )  

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The performances of single tone jamming,AM jamming,DSB jamming and FM jamming on AM communication signal are analyzed.The simulation models and results are also presents.According to the analysis of theories and simulation results,all jamming signals have a good jamming effect when jamming is greater than signal.And the optimal signal of jamming is FM jamming when jamming is less than signal.

MTD Pulse Compression Radar's Countermeasures

LUO Bing

. 2015, 28(1):  44. 

Abstract ( 571 )   PDF (967KB) ( 654 )  

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The working principle of radar is analyzed with LFM signal as an example to address the interference problem of MTD pulse pressure radars.Existing advanced interference means are investigated,from which come the conclusion that the key to efficient radar jamming is coherent signal acquisition,sampled signal's modulation,and false doppler generation.The two important modulation modes of frequency shift and convolution are analyzed with their advantages,disadvantages and application restrictions pointed out.Doppler modulation is analyzed for its necessity and rationality of simple modulation,and the potential demand of complicated doppler modulation is sketched.The simulation results prove its rationality.Finally,MTD pulse compression radar's original reason interference formula is given.

Automatic Modulation Recognition of BPSK,QPSK,UQPSK,and 64QAM Signals

YU Yang,LI Xiaoyan,ZHANG Xiaochun

. 2015, 28(1):  49. 

Abstract ( 652 )   PDF (680KB) ( 508 )  

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In recent years,with the rapid development of wireless communication field such as satellite communication,mobile communication,radar recognition,electronic war,MPSK and MQAM modulation modes have been widely applied,because of their high spectrum efficiency and good noise performance.BPSK,QPSK and UQPSK,64QAM are widely applied especially in the link communication between satellites.This paper puts forward an improved method of new characteristic parameters based on higher-order accumulation for automatic identification for BPSK,QPSK,UQPSK,64QAM signals.This method is simple and effective with small computational complexity,strong recognition ability,high recognition rate,and good real-time performance.

Simulation Analysis of the Radiation Pattern of Three Types of Mobile Phone Antenna and the SAR Contrast Analysis

WANG Ying,YU Lijuan,ZHANG Min

. 2015, 28(1):  53. 

Abstract ( 677 )   PDF (921KB) ( 707 )  

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The EM properties of three types antenna for mobile phone applications are analyzed with the help of the software High frequency structure simulator (HFSS).Simulation of the electric field in the head of human beings and the SAR radiation pattern shows that the radiation of monopole antenna is much lower than meandered loop antenna and PIFA antenna.

Engineering Realization of the Digital Pulse Compression Based on General Hardware

YANG Shoufeng,QIN Qingbing,YU Kai

. 2015, 28(1):  57. 

Abstract ( 668 )   PDF (1052KB) ( 517 )  

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Most of the modern pulse system radars adopt pulse compression technology to resolve the contradiction between range resolution and average power.The engineering realization of the pulse compression technology is shifting from customized hardware to general hardware.The paper expatiates on the basic principle of the digital pulse compression and an engineering realization of the digital pulse compression based on the general hardware,introduces the hardware source and software flow chart of the main IC chips,and verifies the effectiveness of the engineering design method according to a comparison between the simulation results with the practical engineering results.

Design and Implementation of Electronic Voting Machine Circuit Based on FPGA

YANG Dong,ZHANG Chaoying

. 2015, 28(1):  61. 

Abstract ( 626 )   PDF (759KB) ( 526 )  

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In view of the poor expansion capability of traditional electronic voting machine circuits,a program for electronic voting machine circuit with 8 and 10 inputs is designed using VHDL language.The display circuit design is realized by programming on FPGA chip.Circuit analysis and simulation verifies the feasibility of the circuit design.EDA programming offers the circuit the advantages of simple structure,easy expansion,high reliability,good portability,and easy implementation.

Teaching Demonstration Board Design by 80C51 SCM

LIU Yandong,LIANG Chao,DONG Deshuai

. 2015, 28(1):  64. 

Abstract ( 618 )   PDF (771KB) ( 606 )  

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The paper introduces the teaching demonstration board design by 80C51 SCM.The chip 8279 with keyboard control and display functions is used to achieve the functions of the keyboard selection,clock display and light-emitting diode display corresponding P1 input.And the board achieves the Analog-digital conversion function with the demonstration board circuit schematics and software flow chart given.Based on Proteus simulation experiments,debugging of the various functions of the demonstration board is performed.Experiments show that compared with other single-chip teaching demonstration board,the proposed board has simple structure,and specialized functions,and is easy to learn and understand.

Study of Series Capacitor Compensation Circuit Protection Distance

JIA Xinya

. 2015, 28(1):  67. 

Abstract ( 504 )   PDF (582KB) ( 580 )  

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With the development of large capacity and long distance power transmission,series capacitor compensation techniques have been widely applied in ultra high voltage long-distance transmission.This paper introduces the composition and working principle of series capacitor compensation device,and the equivalent model of the different ways of working.The characteristics of MOV are analyzed.Series capacitor compensation technology is a mature technology,by which the series capacitor compensation circuit inductance shortens electrical distance AC transmission,reduces line loss,and improves the line voltage quality and the transmission power with more reasonable distribution of transmission power,system dynamic stability and static stability.

Research on Dynamic Modeling and Position Control of the Quadcopter

XU Dayuan,WANG Yingjian,CHEN Guanjun,ZHANG Wei

. 2015, 28(1):  69. 

Abstract ( 694 )   PDF (676KB) ( 918 )  

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Due to its great application value,quadcopters have drawn increasing attention of domestic institutions.The establishment of quadcopter dynamic model and flight control are two major difficulties.This paper establishes a quadcopter dynamic model,and designs a quadcopter position control system combined with space tracking model based on the acceleration integral and improved PID control algorithm.The Matlab/Simulink module is used to simulate the control system and test the control performance.

A Study of Trransforming ODB++ into PCB Layout File

ZHAO Qiang,ZENG Jiangping,YANG Ju,YUAN Yuzhang

. 2015, 28(1):  73. 

Abstract ( 648 )   PDF (1111KB) ( 574 )  

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In view of the fact that different EDA software can not read each other's output of PCB layout.A method for converting ODB++ files to editable PCB layout file based on the ODB++ standard as the medium is proposed.Experimental results show that this method achieves the expected functions.

Design of a Video Processing System Based on DM8148

CHEN Yanhua,LI Huang,GONG Feng

. 2015, 28(1):  77. 

Abstract ( 678 )   PDF (929KB) ( 692 )  

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This article designs a high-definition video processing system based on DM8148 and describes the each hardware module and system application programming.The video capturing module sends captured data into HDVPSS,and then deinterlacing,size adjustment,OSD addition and H.264 codec processing are applied to the video stream in the video processing module.The processed video stream is output via the HDMI interface.

Design and Implementation of Air Tightness Detector Based on ATMEGA128

WAN Kanran,WANG Ting,SHAO Gan

. 2015, 28(1):  81. 

Abstract ( 500 )   PDF (776KB) ( 473 )  

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An air tightness detector controlled by ATMEGA128 core is designed for the air tightness detection of a medical device parts based on the principle of flow method.Stepping motor is used to achieve automatic measurement,throttle to stable the DUT test pressure in gas path,and precision sensors to receive the changes in the gas flow path.Human-computer interaction is achieved by using Touch screen.Results of experiment show that the detection system achieves automatic detection with good accuracy and efficiency.

Research on Energy Consumption Monitoring and Prediction System

TUO Shuqing,LIANG Peng

. 2015, 28(1):  85. 

Abstract ( 607 )   PDF (826KB) ( 496 )  

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This paper proposes a real-time energy consumption monitoring and prediction system on aluminum casting furnace to deal with the great energy consumption in the production of aluminum and low efficiency of traditional manual data collection.A serial connection is used to connect field meter,gas meter and switches to achieve real-time monitoring of the production energy consumption data;on the other hand,historical production data is employed to train regression support vector machine,and confidence interval is computed by using historical production data.Finally,the trained SVM model of energy consumption is used for energy consumption prediction.The experimental result shows that our system can find abnormal incidents in the production such as energy loss and improper production parameters.

Diagnosability of Cayley Graphs Generated By Transposition Trees Under The Comparison Diagnosis Model

ZHOU Jun

. 2015, 28(1):  89. 

Abstract ( 477 )   PDF (519KB) ( 464 )  

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Diagnosability has played an important role in the reliability of an interconnection network.The n-dimensional star graph has been proved to be (n-1)-diagnosable under the comparison model when n≥4.A star graph belongs to a class of Cayley graphs generated by transposition trees.In this paper,Cayley graphs generated by transposition trees have been proved to be (n-1)-diagnosable under the comparison model when n≥5.

Equipment Health Management System based on UDP Protocol

ZHU Ting,ZHOU Zhijun,HUANG Pian

. 2015, 28(1):  93. 

Abstract ( 564 )   PDF (679KB) ( 433 )  

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The paper analyses the importance of the equipment health management and the necessity of designing and implementing the equipment health management system (EHMS),and introduces the framework and the design of functional module of the system and UDP protocol,then discusses how to use UDP protocol to design and implement the equipment health management system.

Lane Detection Based on RGB Channels

YANG Zhijie

. 2015, 28(1):  95. 

Abstract ( 559 )   PDF (956KB) ( 465 )  

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Lane detection is an important part of intelligent vehicle vision navigation system.In order to improve the detection accuracy,this paper proposes a detection algorithm based on color feature.Transfer function is designed to mark the lane regions based on the color feature of the lane in the image.Then the edge detection algorithm based on morphology is used to detect the edge of the lane.The algorithm has the advantages of simple principle and high accuracy in the lane edge recognition,and has certain significance to the automatic vehicle lane detection.

Real Time Facetracking System Based on NiosII Soft Core

JIN Chun

. 2015, 28(1):  99. 

Abstract ( 567 )   PDF (849KB) ( 490 )  

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The acquisition and tracking of human faces video signals is are realized using low power EP3C40 chip as the core and high performance Nios II as soft core processor.The correlation detection and tracking algorithm is transplanted into Nios II processor mode to realize the whole system function.The experimental results show that the system can accurately track multi-posed faces in the weak change of environment with reconfigurable hardware and simple,fast,and robust algorithm.

Design and Implementation of Data Collection Middleware Model of Internet of Things

GE Ningning,LI Jin

. 2015, 28(1):  103. 

Abstract ( 631 )   PDF (718KB) ( 611 )  

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The development of IOT has led to a large number of heterogeneous data sources,which become the bottleneck of development of Internet of things.In this paper,we implement a data collection middleware model of IOT which based on XML technology.Using this model,it is easy to turn heterogeneous data sources into a unified information standard,and to provide the standard table data call and the WebService for the upper applications.It is useful in eliminating the development bottleneck of Internet of things and the research of network related technology.

Research on and Implementation of Video Tracking System Based on ADSP-BF561

LI Kun,WU Jialong,LIU Zhong

. 2015, 28(1):  106. 

Abstract ( 647 )   PDF (850KB) ( 534 )  

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A video tracking system based on ADSP-BF561 is designed.By controlling the posture of camera,the system can automatically detect and track the moving target in the monitoring scene.By combining the algorithm of inter-frame difference of three frames with image segmentation,target recognition has been realized.Target location is obtained with Kalman-filter,and target tracking is achieved by PTZ control algorithm.Some tests have been done in indoor environment,which show that it can recognize and track the moving object accurately with a good real-time performance and robustness.

Transplanting LWIP Based on Altera FPGA with No

ZHANG Jie,MENG Qi

. 2015, 28(1):  110. 

Abstract ( 622 )   PDF (858KB) ( 572 )  

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This paper analyzes a method transplant LWIP using Altera's EP3C120 based on FPGA,describes in detail the hardware environment construction using SOPC Builder and transplant software in NIOSII,and gives the image operation results.The LWIP transplant offers full TCP/IP functions with limited consumption of processor resources,and meets the requirements of most systems.

Analysis of the Fabrication of Ext 2 Root File System Based on Embedded Linux

WANG Hengliang,WANG Junchao

. 2015, 28(1):  114. 

Abstract ( 500 )   PDF (1283KB) ( 540 )  

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This paper analyzes the whole process of Ext 2 root file system fabrication on Linux 2.6 kernel based on the MPC8379E processor of PowerPC architecture,and gives the flash image operation results.The root file system contains more than one hundred common Linux commands with essential lib files,and has a flash image compressed in only 2.3 MB,which meets the requirements of most systems.Tests show that the system runs stable on MPC8379E-RDB development board.

Research on and Application of Interconnection of FPGA Based on RocketIO

XI Pengfei,FAN Xiaoxing,RAN Yan

. 2015, 28(1):  118. 

Abstract ( 662 )   PDF (864KB) ( 810 )  

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This paper introduces the RocketIO Core embedded in Xilinx Virtex-6 and Virtex-5 FPGAs,and implements the high-speed data transmission between Virtex-6 and Virtex-5 FPGAs.The experiment results show that RocketIO achieves a stable transmission speed up to 3 Gbit·s-1,which meets the requirements of high-speed storage system.

Solution to Non-Negative Matrix Factorization Active Set BB Gradient Algorithm

ZHANG Lu,WEI Xiao

. 2015, 28(1):  122. 

Abstract ( 484 )   PDF (868KB) ( 522 )  

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Non-negative matrix factorization is a new matrix decomposition technique for obtaining two low-rank matrixes from a high-dimensional matrix using non-negative constraints.Most existing algorithms are based on iterative multiplicative update algorithm and alternating least squares.For ANLS's subproblems,this paper proposes an active set BB gradient method,which proves globally convergent.The numerical comparison with projected gradient method (PG) shows that the proposed method is effective.

Multi-agent Agile Workshop Scheduling Based on Intuitionistic Fuzzy Sets

CHEN Xi,TIAN Wenkai

. 2015, 28(1):  127. 

Abstract ( 571 )   PDF (904KB) ( 518 )  

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To overcome the shortcomings that static scheduling neglects the uncertainty in the actual scheduling and that dynamic scheduling can not achieve the agile scheduling requirements,this paper makes an analysis of multi-agent agile workshop scheduling based on intuitionistic fuzzy sets.Firstly,it presents a production control structure of multi-agent manufacturing,which has the characteristics of self-determination and global optimization.Then,it makes a study of the agile workshop scheduling strategy that combines the static scheduling strategy based on particle swarm optimization with the contract net method based on intuitionistic fuzzy sets.By this method,the most satisfactory decision on agile workshop scheduling is made.Finally,the example shows that this method is of great effectiveness in the application of agile workshop scheduling.

Study of Taking-out and Placing-in Scheme of Non-through Vehicle Flows on Radial Private Lines

ZHU Haixiao,NIU Huilan,YONG Anna

. 2015, 28(1):  133. 

Abstract ( 670 )   PDF (747KB) ( 534 )  

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The problem of taking out and placing in of non-through vehicle flows on radial private lines is a complex combinatorial optimization problem.An optimal order is in favor of reducing vehicles non-productivity time at the station and accelerating vehicles turnaround to the greatest extent.According to the characteristics of non-through vehicle flows,the production of initial solution is optimized with the simplified and shortest resident time at station seen as the fitness function.The orders of taking out and placing in are regarded as a whole scheme,and the tabu search algorithm (TS) is designed.Computation results of an example illustrate that this algorithm finds satisfactory solution to the above mentioned problem.

Influence of RF Characteristics on MUSIC Algorithm

CHENG Yajiao,LIU Chendong,SHEN Zhibo

. 2015, 28(1):  136. 

Abstract ( 639 )   PDF (680KB) ( 576 )  

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This paper analyzes the basic principle of the MUSIC algorithm,and according to the three characteristics of the RF radiation source of the frequency,the duration of signal and the signal to noise ratio,their influence on the properties of MUSIC algorithm is analyzed through theoretical derivation,by influencing the wavelength,the frequency then influences the estimation precision of direction finding results,which even produces false spectral peak.It is verified by simulation that signal duration and Signal-to-Noise Ratio within a certain range is proportional to the direction finding estimation precision with which it is simulated.

Blind Symbol Rate Estimation of MSK Signals Based on Wavelet Transform

GAO Xianjin

. 2015, 28(1):  140. 

Abstract ( 534 )   PDF (587KB) ( 421 )  

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A new blind estimation algorithm is proposed for the symbol rate estimation of minimum-shift keying (MSK) signals based on wavelet transform.Firstly the Fourier transform of received signals is applied to the spectrum,and then the symbol rate is coarse estimated to choose STFT window length and three wavelet scales.The changes in signal instantaneous frequency are obtained according to STFT,and the jump of phase of the signal instantaneous frequency is detected using Haar wavelet.Finally,the symbol rate of MSK signals is estimated according to the analysis of the spectrum of the test results.The results show the method can estimate the symbol rate effectively when the signal to noise ratio (SNR) is higher than the threshold.

Frequency Detection with Apfft and Phase Deduction Based on FPGA

CHENG Yao

. 2015, 28(1):  143. 

Abstract ( 624 )   PDF (796KB) ( 725 )  

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Phase deduction has high frequency measurement accuracy and good instantaneity,but is greatly affected by the SNR.For the conventional frequency measurement method based on FFT algorithm,the accuracy depends on transform points,and the instantaneity gets worse with the increase in points.In this paper,a combination of all phase FFT algorithms with the phase invariant characteristics is proposed,and phase deduction is realized on the FPGA platform.Functional simulation confirms that this method can achieve high precision,strong noise resistance as well as good instantaneity.With these advantages,this method is of value in engineering.

Research on Anti Interference Algorithm for Beidou Receiver Based on Space-Time Adaptive Processing

YAO Rui

. 2015, 28(1):  147. 

Abstract ( 657 )   PDF (692KB) ( 592 )  

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In light of the vulnerability of the Beidou receiver to interferences,a space-time adaptive processing algorithm is proposed,which can suppress broadband and narrowband interference without increasing the antenna array element.Simulation results demonstrate the effectiveness of this method.The influence of numbers of taps on anti-interference performance is analyzed.

Humanoid Robot Attitude Algorithm Based on Multi-sensor Information Fusion

XIE Ning,BI Junxi,LOU Xiaoping,ZHU Lianqing

. 2015, 28(1):  150. 

Abstract ( 699 )   PDF (955KB) ( 519 )  

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In the RoboCup soccer field of Humanoid Robots,the real-time attitude algorithm on Humanoid Robots is one of the core technologies of the Motion Control System.The paper mainly introduces the properties of MEMS accelerometer,magnetometer and gyroscope.On the premise of autonomous measurement of attitude,the author fuses multi-sensor information of inertial measurement unit,and proposes the attitude algorithm based on quaternion.In view of the noises and measurement errors of sensor data,this method designs Kalman filter to gain the compensation for shifts in data.Thus,the measuring accuracy of the whole attitude estimation is improved.Experimental results validate the proposed method.

Feature-based Data Stream Clustering Algorithm Projection and Fitting in Data Processing

JIANG Nan,XU Qin

. 2015, 28(1):  155. 

Abstract ( 569 )   PDF (589KB) ( 409 )  

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The trend of data stream is analyzed based on monitoring data using a special projection clustering and fitting algorithm,which combines the pre-processing algorithms and sliding window technique.The bridge health monitoring simulation experiments are performed with fitting data of higher accuracy (segment R2 at distance close to 1,m=0.890 4＜0.5),thus solving the dimensionality reduction of high dimensional data stream,and reducing the data processing time with an increase in efficiency by 39.1% and a space occupation of only 6.7%.

Improved DV-Hop Algorithm Based on Hop Count Correction

HAN Zhen,XIAO Tiejun

. 2015, 28(1):  158. 

Abstract ( 522 )   PDF (918KB) ( 480 )  

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An improved algorithm based on horizontal and vertical correction of hop counts is proposed to solve problem of traditional DV-Hop (Distance Vector-Hop) algorithm that the hop count information can not accurately reflect the distance relationship between two thus large errors in Wireless Sensor Networks (WSN).With hop horizontal correction between adjacent nodes,the hop count can be refined according to the radio of the distance between nodes and the node communication radius.And during this process,RSSI technique is adopted.On the basis of horizontal correction,correction angle is introduced during vertical correction of hop counts for node-adjacent nodes with the analysis of the possibility of inter-node distribution.The simulation results show that under the same network conditions,the proposed algorithm greatly improved the location accuracy effectively at the expense of a small amount of computation compared with DV-Hop algorithm.

Design of IOT Router Based on Quark Microprocessor X1000

ZHANG Xuemei

. 2015, 28(1):  164. 

Abstract ( 466 )   PDF (630KB) ( 466 )  

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This paper introduces the hardware and software design of IOT router based on Quark microprocessor X1000,and the bedded IPV6 protocol stack and adaptive frequency hopping algorithm design.With good gateway security and easy management,the IOT router achieving interoperability between various networking equipment has wide market application prospect and advanced technology.

Improvement and Simulation of S-MAC Protocol in WMSNs

HAN Shuaishuai,WANG Baolin,ZHANG Dehai

. 2015, 28(1):  167. 

Abstract ( 465 )   PDF (845KB) ( 466 )  

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In WMSNs the contention-based S-MAC protocol has the problems that it can not make nodes' active time fit for the dynamic workload and the latency brought about by nodes' sleeping.In view of the sudden change in the flow of data in WMSNs,this paper presents a dynamic duty ratio adjusting mechanism based on the traffic load in order to improve the network time delay performance and throughput performance.The improved algorithm is carried out on NS2 simulator.The simulation results show that QD-MAC protocol makes node fitting for the dynamic workload while reducing the latency caused by nodes' sleep.

Summary of the Scalability of Control Plane in OpenFlow-based SDN

LI Lilong,LV Guanghong,DONG Yongbin

. 2015, 28(1):  171. 

Abstract ( 806 )   PDF (905KB) ( 486 )  

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OpenFlow in its early stage has been mainly for researchers to design their innovative network architecture,and provides a real platform on campus.Eventually it forms the new network architecture of SDN.With the increase of its scope in application,its problems have been gradually revealed,especially in scalability.This paper firstly describes the background,characteristics and current development of OpenFlow,analyses some scalability issues and solutions in-depth,and presents several typical SDN controller models and control plane frameworks.Finally,it summaries the future development trend of SDN.

Light Mobile Challenges and Solutions Facing Small Cell Backhaul

ZHANG Fenghuan

. 2015, 28(1):  176. 

Abstract ( 499 )   PDF (678KB) ( 384 )  

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Small cell optical backhauling brings forth new challenges and opportunities in connecting radio access to service edge.These relate in particular to macro cells and optical distribution networks,network demarcation,control and management architectures,and convergence with fixed broadband access.Demand for mobile broadband services is constantly increasing,requiring operators to provide more and more capacity from their radio access networks.LTE and small cells can offer a promising solution to provide almost unlimited coverage and capacity.However,backhaul technologies can be expensive in terms of CAPEX,and none of the traditional solutions provides the necessary combination of capacity and cost-efficiency.This paper defines a Q-band point to multipoint backhaul architecture that provides multi-gigabit capacity in a cost-effective manner.with emphasis on the architecture for future mobile backhaul and access wireless networks as proposed in the framework of the SARABAND project,offering multi-gigabit capacity in a cost-effective manner by combining point to multipoint transmissions and millimeter wave (mm-wave) technology in the Q-band.Apart from the network definition,the key type of nodes comprising the SARABAND architecture is described.

Research on Cloud Computing Application on Mobile Internet

SUN Yaoyao

. 2015, 28(1):  179. 

Abstract ( 639 )   PDF (845KB) ( 399 )  

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With the rapid development of cloud computing the unceasing optimization of mobile Internet,and the growing popularity of the intelligent terminal,mobile cloud computing becomes the future of mobile Internet.This paper analyzes the main research on mobile cloud computing on present mobile Internet,summarizes the features and major problems of the mobile cloud computing,and points out the prospects of its development.

Analysis of the Present Situation and Development Trend of X-band Klystron Power Amplifier

GUO Zhongkai,HOU Manhong

. 2015, 28(1):  183. 

Abstract ( 579 )   PDF (631KB) ( 481 )  

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The transmitter,as the core component of the deep space exploration system,must provide high power radio frequency energy for the system,to detect the distant targets.The outstanding advantage of the klystron transmitter lies in its capability of high power output and operation at the X band with high efficiency and low cost of development,which are not characteristic of the solid-state transmitter.Therefore,the development of high conversion efficiency,high reliability and high output power klystron transmitter is the key to the success of deep space exploration.This paper introduces the development of X band continuous wave (CW) klystron transmitter and reviews the current situation and development trend Using,the development of ultra high power CW klystron transmitter is discussed based on existing technology to provide support for China's deep space exploration.

Research on Detection Circuits for MEMS Capacitive Pressure Sensor

HUANG Yumeng,QI Haochen,HU Zhiwen,ZHANG Jian

. 2015, 28(1):  186. 

Abstract ( 571 )   PDF (755KB) ( 486 )  

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MEMS capacitive pressure sensor has the advantages of low power consumption,good temperature stability,solid and fast dynamic response.Five kinds of detection circuit for MEMS capacitive pressure sensor are introduced,which are based on PWM,operational amplifiers,charge injection,FM and AC amplifier respectively.These detection circuits are compared in stability,sensitivity of measurements,resistance to spurious and some other aspects,and their advantages and disadvantages are concluded.This paper provides useful references to designer of detection circuit for MEMS capacitive pressure sensor.