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May 30,2010
Volume 3,Issue 10
Pages 972-1085
Subject Area:Automatics Application,Autocontrol Technology,Communications Technology,Image Processing,Electronic Technology,Electronic Circuit,Communication Network Technology,Fibre Optical Communication Technology

Title: Direct vector control of asynchronous motor based on Matlab

Authors: LI Jun, QIN Bin, WANG Zhongqing
PP: 1079～1085
Abstract: Based on vector control, this paper analyzed the magnetic linkage current model of rotor based on two phase rotary coordinate system, proposed the timing method of two closed loop and emulated the system based on Matlab/Simulink and got a real simulation result. According to the flux observer it used the current model and gave separate Matlab/Simulink simulation tests which were based on different time scales and added loads on certain time scale. It obtained the rotate characteristics of asynchronous motor at high and middle speed. The result of experiment indicated that the system is good at static and dynamic properties. The model of flux can be formed conveniently with different purposes and construct new system. Asynchronous motor also can be perfected at the beginning and be strengthened to have a great practical value.
Keywords: automatic control technology; the simulation of direct vector control of asynchronous motor; Matlab/Simulink simulation; vector control; two closed loop control

Title: Research on online state monitoring and fault diagnosis for PEMFC system

Authors: LUO Liangqing, LOU Ping, HAN Rui
PP: 1074～1078
Abstract: By analyzing the structure and working principles of a proton exchange membrane fuel cell (PEMFC) system, the paper presents two feasible schemes of a fuel cell voltage monitoring system based on double control area network(double CAN) network and an online fuel cell impedance measurement system based on electrochemical impedance spectroscopy (EIS), respectively. In consideration of the structural and multi sensor characteristics of the PEMFC system, a fault diagnosis method based on distributed neural network was proposed and further elaborated, which proved to simplify the process of the fault diagnosis and improve its real time performance, as well as better the PEMFC system s working stability and reliability.
Keywords: automatic control technology; fault diagnosis; distributed neural network; proton exchange membrane fuel cell

Title: Design of intelligent tracing electric vehicle

Authors: CHEN Jian, ZHANG Weigang, WU Dunfu
PP: 1067～1073
Abstract: This paper describes the implementation of intelligent tracing electric car microcontroller based STC89C52. The system uses four infrared reflective photoelectric sensors ST188 to detect the black track lines, so that car can run along predetermined trajectory. A ST188 and a photoelectric encoder disk are used to detect the speed of the car in order to achieve the display of speed and distance. Testing shows that car can realize intended function and run stably.
Keywords: automatic control technology; intelligent vehicle; reflective photoelectric sensor; tracking; velocity measurement

Title: Analysis of bit error rate of ultra wide band system based on RS codes

Authors: LI Baobao, ZHANG Zhaoxia, WANG Huakui
PP: 1058～1066
Abstract: The design of time hopping (TH) sequences is very important in ultra wide band (UWB) communication system. In this paper, through the in depth analysis of key indicators of reed solomon (RS)codes, a multiple access method using RS code for TH sequence is presented. UWB system, modulated by pulse position modulation (PPM) and pulse amplitude modulation (PAM), instead of using random TH by using RS codes, was simulated on the platform of Matlab. Through computer simulation, high system capacity of the proposed system and superior performance over the conventional TH based UWB systems in the channel of S V was verified. It indicated that the lower bit error rate (BER) had been reached by modified arithmetic. In the condition of multi user communication, good applicability was shown between RS codes and UWB system. The interference between the users was effectively reduced and got lower BER.
Keywords: signal and information processing; ultra wide band; pulse position modulation; pulse amplitude modulation; Reed Solomon codes; multi user

Title: Implementation of 3D spectrum analyzer on FPGA using HHT algorithm

Authors: LI Cheng, DING Xiaoming, XIONG Ke
PP: 1051～1057
Abstract: The paper designs a 3D spectrum analyzer based on HHT (Hilbert Huang transform). It can analyze nonlinear and non stationary signal except the traditional linear and stationary signal. The spectrum uses the DE2 FPGA board and NiosⅡ processor of Altera as hardware platform. In the proposed system, the real time outside signal, collected through audio acquisition module on DE2, is processed by HHT module. Moreover, the analysis results in terms of the 3D graph of time frequency energy distribution are displayed by the VGA module. Experimental result shows that the spectrum analyzer is very suitable for nonlinear and non stationary signal, which is able to show the instantaneous frequency and energy of the signal clearly, and overcomes the drawbacks of the traditional signal analyzers.
Keywords: signal and information processing; field programmable gate array; Hilbert Huang transform; spectrum analysis; fast Fourier transformation; video graphics array

Title: Research on sonar image pre processing and target block shadow extraction

Authors: WU Jiawei, FAN Xinnan
PP: 1042～1050
Abstract: In this paper, a brief analysis of sonar image distortion and noise had been made. Taking the image made by StarFish 450F side scan sonar as the object, it used image processing algorithms to make pre process to remove acoustic distortion and tailing effect of the image, and then analyzed and compared the results of different ways. After pretreatment, by sharpening the gradient operator successfully, it extracted the required objectives block shadows clearly, which proved the effectiveness of the methods.
Keywords: image processing; shadow extraction; block shadows

Title: A temporal error concealment algorithm for H.264 based on adaptive overlapping

Authors: XIONG Chunbin, ZHANG Youzhi, LI Qingtao
PP: 1036～1041
Abstract: To improve the quality of the reconstructed picture in video communication, a novel temporal error concealment algorithm for H.264 based on multi division mode adaptive overlapping is proposed. In this algorithm, external boundary matching algorithm (EBMA) is improved first, then the corrupted macroblock (MB) is concealed several times, each with different division mode, and the sum of absolute differences (SAD) of each mode is calculated. According to the value of SADs, two MBs with smallest SAD and second smallest SAD are weighted overlapping adaptively to conceal the lost MB. The simulation results show that, compared with the traditional algorithm, this algorithm has better performance of concealment in both objective and subjective evaluations.
Keywords: image processing；H.264 compression coding; self adaptive weighted overlapping; error concealment

Title: The hardware design of dual mode wireless video monitoring system based on DM6437

Authors: KANG Liping, XIE Gang, ZHAO Zhefeng
PP: 1031～1035
Abstract: Based on WiFi and WiMAX, with TMS320DM6437 as the main processor and the use of highly efficient video coding standard: H.264 compression algorithm, wireless intelligent video monitoring system was realized. In the thesis, the composition, structure and functions of the system are analyzed, described and designed in detail. Not only the overall framework of the system consisting of video capture module, audio input and output modules, WiFi and WiMAX wireless module, power, CPLD module and Pan regulation but also design and implementation of system modules are given.
Keywords: digital image processing; TMS320DM6437; wireless module of WiFi and WiMAX; intelligent video monitoring; H.264

Title: A method for moving vehicle recognition and it s realization on Davinci platform

Authors: TANG Xiaolin, CAO Guangzhong
PP: 1025～1030
Abstract: Aiming at the real time request of moving vehicles recognition, this paper proposes an moving vehicle recognition method based on embedded Davinci platform. The paper designs a moving vehicle recognition algorithm, which combines virtual detection line to computer vision. It applies background subtraction to separate moving vehicle from background, gets vehicle's length and width from the contour, updates background in real time, and implements vehicle type reorganization by use of the length and width. The simulation result on Matlab shows that the algorithm can effectively recognize the moving vehicle. By implementation of this algorithm on Davinci platform, this paper provides an embedded vehicle recognition system. Experimental results show that this system is capable of effectively recognizing moving vehicles, has advantages of short recognition time, low energy consumption and stable performance, and has application value.
Keywords: vehicle recognition; vehicle detection; virtual detection line; background subtraction; Davinci platform

Title: The hardware design of small robot system based on ATmega16L

Authors: HUANG He, LIU Xiaowen, ZHANG Liang, LI Xiao, LIU Xuerui
PP: 1019～1024
Abstract: This paper discloses the design and implementation methods of the small robotic hardware system. As the controller of the robot, ATmega16L is used in this system. The system chooses the serial port communication to debug the robotic single step movements, using the wireless half duplex communication module nRF2401 to realize the robots wireless communication. This paper discusses the basic principles of serial communication, and the characteristics of nRF2401 wireless half duplex communication module, in addition, it introduces and analyzes the way to design the system s printed circuit board (PCB). Practical results indicate that the small double foot robot system based on hardware systems has good performance.
Keywords: robot control; ATmega16L; serial communication; nRF2401; printed circuit board

Title: High precision delay measurement system based on FPGA

Authors: YANG Jingchao, WANG Liming
PP: 1014～1018
Abstract: Delay measurement is the key to time difference of arrival (TDOA) technology. In view of this need, a kind of high precision delay measurement system based on field programmable gate array (FPGA) is proposed. The delay measurement unit is realized on Altera Cyclone EP1C3T144 with the interface of Ethernet, universal serial bus (USB) and RS232. This design has simple circuit structure, low cost, high precision, easy transplant and can be widely applied to localization, navigation and range acquisition.
Keywords: electronic circuit; delay measurement; field programmable gate array; Ethernet; universal serial bus

Title: The application of linear optocoupler in analog isolation board

Authors: SHI Liping, WANG Lihua, BIAN Shaoshun
PP: 1009～1013
Abstract: This paper uses HCNR200 to constitute an analog isolation circuit board, while selects the appropriate circuit parameters and experimental methods. The excellent way to solve the problem of analog isolation is completed, and it can transform 4~20 mA current signal which is sent from the engineering field sensors into the corresponding proportion linear voltage signal whose range is 1~5 V. The voltage signal is provided to the programmable logic controller (PLC) analog input module, and the errors caused by the difference between the voltage from the internal or the external circuit to the earth can be avoided, and it can protect the internal circuitry from external circuit failure. The circuit has good linearity and high accuracy; and the circuit structure is simple and practical, its experimental effect is good.
Keywords: electronics; analog isolation board; linear optocoupler; HCNR200; current voltage conservation

Title: Power quality disturbances classification based on wavelet transform and binary tree architecture SVM

Authors: FENG Hao, ZHOU Luowei, LIU Yi
PP: 1002～1008
Abstract: Classification of power quality (PQ) disturbances has two key processes: feature extraction and classifier design. A new method based on wavelet transform and support vector machine with binary tree architecture (SVM BTA) is presented for power quality disturbances classification. At first, by use of alternative transients program (ATP), eight typical and two complex disturbance signals are generated as sample set. Then wavelet transform is applied to obtain multiple features, including the number of modulus maximum value, signal energy and the standard deviation of wavelet coefficients in special frequency band. This can reduce the data size and reflect the local feature of disturbance signals better. At last, the SVM BTA multi classifier is trained and tested by the sample set. The test results show that the proposed method can effectively classify ten disturbance signals with high classification accuracy and short training time.
Keywords: power system; power quality; disturbance classification; wavelet transform; support vector machine

Title: The FPGA realization of frame timing synchronization in TDD-LTE system

Authors: LI Shixing, CHENG Fang
PP: 996～1001
Abstract: This paper illuminates a method to achieve fast frame timing synchronization based on the research of the frame structure and the primary synchronization signal for time division duplexing-long term evolution （TDD-LTE） system and Schmidl algorithm. This method is based on the Schmidl algorithm and the following improvements are proposed, they are making 16 fold down sampling processing on the data and setting 128 dots for sliding window length and setting 32 dots for sliding step. In this paper, the synchronization implementation principle which is based on the improved algorithm is analyzed in detail. A field programmable gate array (FPGA) based implementation scheme for frame timing synchronization is deeply introduced and coded in very high speed integrated circuit hardware description language（VHDL）. The simulation result indicates that this method meets the requirements of the synchronization of the TDD-LTE system and achieves fast and accurate synchronization through a simple structure.
Keywords: wireless communication；time division duplexing-long term evolution （TDD-LTE）; frame timing synchronization; Schmidl algorithm; field programmable gate array

Title: Research and implementation of remote access technology for white goods based on Internet

Authors: LU Peng, ZHOU Ning, LI Fangmin
PP: 989～995
Abstract: The paper researches remote access technology for white goods based on Internet, and divides into three implementation proposals according to the installing place of the server. The paper separately introduces the whole system framework, the working theorem and the working process of three implementation proposals; and analyses the advantages and disadvantages of the three proposals from cost, expandability and safety deeply. The paper presents a practical proposal: “the third party” server proposal; the proposal solves the dynamic allocating IP problem of access network. Besides, the server is installed on the third party s huge server, so it strengthens safety of the system. And this proposal reduces demand to household gateway, so it decreases the cost of consumer. Through on the spot test of household appliances company, “the third party” server proposal works steady and successfully achieves the aim of remote access of white goods.
Keywords: communication network technology; remote access; server; white goods; home gateway

Title: Joint channel and noise estimation in the present of narrowband interference for OFDM systems

Authors: YI Youwen, JIANG Tao, QU Daiming
PP: 980～988
Abstract: In this paper, an iterative algorithm is proposed that combines channel and noise estimation with decoding to combat unknown narrowband interference for orthogonal frequency division multiplexing (OFDM) based communication systems. Simulation results show that the proposed iterative schemes effectively achieve a quasi optimal bit error ratio (BER) performance with low complexity. It is also shown that the proposed schemes are robust with respect to power and bandwidth of the interference. Moreover, the Cramér Rao Bounds (CRB) for mean square errors of channel and noise estimations are derived, and it is validated that the CRBs can be achieved via the proposed schemes with very few iteration numbers.
Keywords: communication techniques; narrowband interference; joint channel and noise estimation; orthogonal frequency division multiplexing

Title: Quantum financial transactional IC card

Authors: DONG Xiaoliang, ZHENG Baoyu, ZHAO Shengmei
PP: 976～979
Abstract: Using e wallet and quantum technology together, the paper gives a method to implement the QFIC (quantum financial transactional integrated circuit)card, based on off line and on line scenario. The security is also discussed. When working off line, a QFIC with 128 quantum bits in two bases can make the probability of success fall into 2-128≈2.9E-39. While working on line, the eavesdropper can be found easily by transferring the information with BB84 or other quantum security communication protocol, and hence the using of QFIC is secure.
Keywords: information processing technology; e wallet; quantum financial transactional integrated circuit card; BB84 protocol

Title: Tunable format conversion from CSRZ to RZ based on periodically poled LiNbO3 waveguide

Authors: ZHOU Yujie, SUN Junqiang, WANG Jian
PP: 972～975
Abstract: This paper studied cascaded sum and difference frequency generation (cSFG/DFG) in periodically poled lithium niobate (PPLN) waveguide. The analytical solutions to cSFG/DFG are derived under non depletion approximation. The paper has theoretically and experimentally demonstrated tunable format conversions from carrier suppressed retur to zero (CSRZ) to return to zero (RZ) together with logic AND gate at the data rate of 40 Gbit/s.
Keywords: information processing technology; all optical format conversion; cascaded second order nonlinear effects; periodically poled lithium niobate waveguide; tunable

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