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Table of Content

15 July 2016 Volume 29 Issue 7
  
    Articles
    Improved Quantum ant Colony Algorithm of Path Planning for Mobile Robot Based on Grid Model
    ZHANG Chen, YOU Xiaoming
    . 2016, 29(7):  1. 
    Abstract ( 470 )   PDF (1011KB) ( 394 )  
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    For mobile robot path planning in complex environments, an ant colony algorithm based on quantum (QACA) is proposed to plan the optimal collision-free path. The core of the algorithm is the introduction of the quantum state vector of quantum algorithm to respect the pheromone and quantum revolving gate to update the pheromone in ant colony system (ACS), in order to increase the diversity of position and to speed up the convergence speed of the algorithm. Simulation comparison shows that the algorithm can increase the randomness of the algorithm with better population diversity, higher convergence speed and better global optimization ability than the traditional ant colony algorithm, and can quickly find a optimal path planning even in the very complex environment.

    Variable Stepsize Blind Sources Separation for Speech Signals by Firefly Algorithm
    LUAN Xiandong, XU Yan
    . 2016, 29(7):  4. 
    Abstract ( 337 )   PDF (746KB) ( 289 )  
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    Traditional natural gradient algorithm of blind source separation for speech signals is contradictions, which suffers errors between convergence speed and steadystate. A novel variable stepsize algorithm is proposed to solve this problem. The stepsize of traditional natural gradient algorithm is adjusted by the firefly algorithm to yield variable signals with the separation degree. Computer simulations verify the feasibility of this new algorithm, which offers better separation results with faster convergence and less steadystate errors.

    Research on Electromagnetic Propagation Model and AP Channel Assignment Algorithm in WLAN
    LU Zengqing, LI Yun
    . 2016, 29(7):  8. 
    Abstract ( 424 )   PDF (727KB) ( 404 )  
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    The optimization of WLAN network is proposed to solve the problem of the unreasonable point selection of strong interference in indoor environment. This paper summarizes several common propagation models in WLAN network and presents the genetic algorithm in channel allocation, respectively. Then this paper gives a simulation of the algorithm and introduces the elite mechanism during the operation steps, which is capable of faster convergence and intelligent computing. The use of elite mechanism improves the speed by 79.3% over the traditional roulette method.

    Algorithm for Rectification in 3D Reconstruction System
    TANG Bin, JIN Xuanhong
    . 2016, 29(7):  12. 
    Abstract ( 357 )   PDF (1256KB) ( 370 )  
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    In designing the 3D reconstruction system, it is found that the accuracy and precision of 3D reconstruction results is subject directly to the accuracy of the rectification algorithm. The control point transformation is combined with the gray value interpolation algorithm to rectify the plume. This method defines the space transform itself by a control point transformation, which is used to describe how each pixel "mobile" from the initial position to the end position. Then, a smooth mapping is produced by grey value interpolation algorithm and the gray levels of pixels are changed to achieve rectification. Finally, the images before and after the rectification and their gray values are compared, showing that the whole image has a 150px left shift

    A Blind Detection Digital Watermarking Algorithm Based on WLD Features
    ZHENG Wei, ZHANG Daxing, JING Yangshuai
    . 2016, 29(7):  15. 
    Abstract ( 408 )   PDF (1115KB) ( 268 )  
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    This paper proposes a blind watermarking scheme based on the WLD features. The watermark information is a robust and security binary sequence, with the result of successively encoding, encryption operation based on WLD features. The sector partition scheme and embed watermark in introduced into the DCT frequency domain. Based on WLD global statistical characteristics, the watermark can be extracted and authenticated with out the aid of the host image. Experiments show that the watermark has a good invisibility with a good robustness to additive noise, gamma correction and shear operations. As a blind robust watermarking algorithm, our scheme offers convenient image authentication.

    A SemiDefinite Relaxation Programming Approach to AOA Source Localization
    WANG Zhihong, YUAN Peng
    . 2016, 29(7):  19. 
    Abstract ( 386 )   PDF (644KB) ( 309 )  
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    In this paper, a new semidefinite programming approach is devised for AOA source localization. The main idea is to include the noise components as parameters of interests, which increases the flexibility in the convex optimization formulation. The original nonconvex quadratic optimization problem of source position is converted first into an equivalent nonconvex semidefinite programming problem, and then into a convex optimization problem, thus resolving the convex optimization problem and serves as a good approximate of original difficult problem. The computer simulation results show that the semidefinite relaxation method can effectively solve the source localization problem

    Prediction of the Production of Transparent Material by HAFBPS
    XU Xiaolei, NIE Wenhui, CAO Fei
    . 2016, 29(7):  22. 
    Abstract ( 309 )   PDF (883KB) ( 272 )  
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    Currently, there is no good method for the production of hyaluronic acid forecast. This paper presents a model of particle swarm algorithm, HAFBPS, to predict the production of hyaluronic acid. The accuracy of SVM depends on the set of penalty coefficient and nuclear parameters. In order to improve its accuracy and efficiency, we transform the penalty coefficients and parameters into a solution of the space using particle swarm algorithm to optimize its operation in the global scope. Comparison of the results show that HAFBPS have higher accuracy on prediction of hyaluronic acid.

    Research on Algorithm Mode of Optimization Problems
    CUI Li
    . 2016, 29(7):  26. 
    Abstract ( 414 )   PDF (690KB) ( 261 )  
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    The algorithm reuse idea is proposed to improve the efficiency and reduce design time of algorithm design. The example of algorithm for the N queen problem is taken to describe the algorithm design process, which is developed from algorithm framework to specific algorithm. By algorithm reuse, one can fill the specific details of the algorithm under the algorithm framework, implement functions according to our choice in order to avoid the repetitive tasks of algorithm design, and save the time and effort required for algorithm design, thus improving the efficiency of algorithm design.

    Research on Flameout Vibration Reduction of Automotive Driveline Systems
    LI Kai1, ZHANG Zhendong1, WU Xuling2, ZHOU Zhe1
    . 2016, 29(7):  29. 
    Abstract ( 447 )   PDF (1241KB) ( 288 )  
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    Vehicle with Dual Mass Flywheel (DMF) reduces the vibration during normal driving conditions at the cost of aggravating the vibration response during the flameout condition. This paper proposes a vibration reduction strategy based on the resonance speed range when the transmission has installed the DMF. This result is concluded by the experiments of a specific type of vehicle. The results of different test schemes indicate that the vehicle in the flameout condition by ECU closes inlet throttling valve (TVA) and exhaust gas recirculation (EGR) valve, and that the control algorithm of cut-off time delay fault oil moment is appropriate. The algorithm saves half of the time of the driveline system through the resonance speed range, thus significantly improving the transmission systems vibration level during the flameout condition.

    An Approach to Threat Assessment of Aerial Targets Based on BP Neural Network Algorithm Using Ant Colony Optimization
    DENG Yumei
    . 2016, 29(7):  33. 
    Abstract ( 444 )   PDF (746KB) ( 254 )  
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    On the basis of the characteristics of aerial targets threat assessment, the weaknesses of BP neural network for aerial targets threat assessment are analyzed. By using the ant colony optimization (ACO) algorithm seeking global excellent result to optimize the random of BP algorithm, a new aerial targets threat assessment method is established and the ACOBP algorithm is achieved by the method, which overcomes the randomness of BP network initial weights, solves the problem lost in local minimum, and improves convergence speed of the network. Finally, the performance of the algorithm is analyzed. Simulation results show the ACOBP algorithm can estimate threat degree accurately and appropriately with faster convergence and better performance than the BP algorithm, proving that the ACOBP algorithm is an effective approach to threat assessment.

    Design of Adaptive Fuzzy Controller for Nonlinear Systems
    WU Haiqing, SU Zhan, SHEN Yuming
    . 2016, 29(7):  36. 
    Abstract ( 405 )   PDF (620KB) ( 325 )  
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    In this paper, a fuzzy adaptive controller is designed for the nonlinear system. The fuzzy adaptive controller is designed for the stability and control effect of the system based on the feedback control and the adaptive law of the parameter vector, combined with the Lyapunov stability theory. In order to verify the effectiveness of the controller, the controller is applied to the stability control of the two stage inverted pendulum system. The simulation results show that the controller is effective and has better control effect than the traditional control method.

    A Calibration Method for External Camera Parameters Based on Two Parallel Lines of Highway
    SUN Yinghui
    . 2016, 29(7):  40. 
    Abstract ( 432 )   PDF (781KB) ( 616 )  
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    A new method based on lane line for self calibration of vehicle camera, especially the external parameter calibration, is proposed. By using the relationship between the external parameters of the camera and the vanishing point and the shooting angle, the calculation method of the external parameters is simplified. With the height of the camera given, the parameters can be calibrated by looking for two of the parallel line information. Experiments show that the proposed algorithm is feasible and of practical value.

    Research on Intelligent PID Control Algorithm and Matlab Simulation
    CAI Shumin1, WANG Yagang1, TIAN Tao2
    . 2016, 29(7):  43. 
    Abstract ( 466 )   PDF (704KB) ( 290 )  
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    With the rapid development of modern industry, the conventional PID control algorithm can not meet the requirements of the control task. In order to solve these problems, the fuzzy PID control and BP neural network PID control are included in intelligent PID control for simulation and comparison of the control results of the intelligent PID control and conventional PID control. The experiments show that the overshoot of the intelligent PID control can reach 0 with the stability time greatly shortened and the dynamic and static characteristics of the system improved.

    A Hybrid P2P Overlay for Multiattribute Queries in Cloud Computing
    DU Xiaofeng1, CHEN Shiping2
    . 2016, 29(7):  47. 
    Abstract ( 315 )   PDF (1123KB) ( 263 )  
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    To resolve the multiattribute queries of cloud resource in cloud computing, a hybrid P2P overlay is proposed in this paper. The overlay is based on the combination of multistar topology. Multiattribute queries will be achieved if the normalized cloud resource is deployed to the overlay. In the paper, the algorithm for multiattribute queries and the performance of the network are described. The overlay is designed to reduce the number of hops in resource searching, so the analysis to the number of hops is the point in the paper. The experimental results show that the number of hops in the overlay is reduced as respected.

    Algorithm for Virtual Machine Deployment in Cloud Computing Environment Based on Resource Rating
    LIU Xiu, LI Ye
    . 2016, 29(7):  51. 
    Abstract ( 400 )   PDF (961KB) ( 312 )  
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    Many problems may occur during a large scale deployment of VMs, such as overall load imbalance in data center and high VM deployment rejection rate. This paper proposes a resources rating based placement algorithm (RRPA). By considering the affinity relationship between VMs, the topological relationship between PMs, and the connection link bandwidth, one or several PMs mostly appropriate for VNFs deployment are chosen. The simulation results show that RRPA has a higher degree of resource equilibrium and lower rejection rate of deployment than existing methods under the same condition.

    A SURF Algorithm Based on the Fourier Merlin Transform
    NA Yan, LIAO Mengmeng
    . 2016, 29(7):  55. 
    Abstract ( 460 )   PDF (795KB) ( 254 )  
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    A SURF algorithm based on the Fourier Merlin transform is proposed to improve the registration accuracy of speed up robust features in dealing with the registration when there is large rotation between images under the condition that no removal error registration algorithm. The floated image and reference image are Fourier transformed and Merlin transformed by the proposed algorithm, after which the rotation angle between two images is computed by using the energy spectrum, and the changes of translation and scale between the two images are computed by the SURF algorithm, thus realizing the registration of two images. Experimental results show that the registration with large rotation between two images can be effectively realized by the proposed algorithm with better registration result than that by the SIFT algorithm and the SURF algorithm available.

    Simulation Software for Evolution of BA Scalefree Networks Based on LabVIEW
    ZHOU Qian, CHEN Jiaying, LIU Haiyang, WANG Meibao, L Mengxuan, LIU Song, LIU Ge
    . 2016, 29(7):  58. 
    Abstract ( 431 )   PDF (1504KB) ( 336 )  
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    BA scale free network model describes the evolutionary character of most networks in nature and human society. However, we lack software to simulate the evolution of BA network to illustrate its properties of growth and preferential attachment. In view of the lack, we developed a software package via Labview combined with Matlab. We apply Labview to construct the humanmachine interface and to realize the evolution animation. Matlab is utilized to compute all the data such as adjacent matrix, node degrees and attachment probabilities. The evolution of the network can be vividly shown by adding node after node when a command button is clicked again and again. The software is beneficial to learn and understand the BA model of scale free networks. An example the BA scalefree evolution is given, and the results show that the software is capable not only of displaying the process of the network evolution, but also of dynamic calculation of the adjacent matrix, node degrees and attachment probabilities.

    Design of Dual Channel Humidity Monitoring System Based on LabVIEW
    WU Yongling1, 2, YANG Na1, PAN Xiaohui1, WANG Wenjiang1
    . 2016, 29(7):  61. 
    Abstract ( 418 )   PDF (972KB) ( 261 )  
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    This paper establishes a two-channel humidity monitoring system using the hardware of NI USB-6009 data acquisition card, AMT2001 humidity sensor module and PC and the software of LabVIEW. The debugging test shows that this operating system offers ease and stable operation at low cost, real-time display of humidity data, acousto-optic transfinite alarm and data storage. It has the characteristics of flexible parameter setting of delay time and humidity threshold value and is applicable to the real-time and accurate humidity monitoring in different fields.

    General DataBase Accessing Interface Middleware’s Design and Application
    SHI Bin
    . 2016, 29(7):  64. 
    Abstract ( 313 )   PDF (965KB) ( 258 )  
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    Nowadays, there is big difference of the developing interface provided by database system of the high-level language(for example: C++), We need to write the corresponding code for the specified database. While database is changed, the code should be modified accordingly, the flexibility of the system becomes worse. In view of the above problems, adopting the layered thought, that is, inserting the middle layer between the application and database access layer, called general database access interface (GDBAI) middleware. By abstracting the application and the database access layer, the application and the database access control are separated, and the amount of code is reduced at least 20%, and the ease of use and maintainability are improved.

    Driver Design Based on EZ-USB FX3
    LIU Jie, DIAO Jietao, LI Nan, SUN Zhaolin
    . 2016, 29(7):  68. 
    Abstract ( 379 )   PDF (801KB) ( 277 )  
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    USB30 data transfer interface is gradually replacing the USB20 interface as the protagonist of the electronic device interface with its significant advantages in terms of transmission speed and the needs for driven development are also increasing. The traditional driver design approach with Driver Studio + WDM structure fails to meet the needs for real-world applications due to the complex structure and the huge time consumption. In this paper, the USB30 driver is designed with a new WDF driver architecture in Visual Studio2013 + WDK81 development and compilation environment by the universal driver improved method. Results show that the driver designed by this method works stably, effectively reducing the driver development effort and shortens the development cycle.

    Compression and Recovery of 3D Body Point Clouds Based on Compressed Sensing
    LIU Jia
    . 2016, 29(7):  72. 
    Abstract ( 396 )   PDF (910KB) ( 273 )  
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    With higher precision of the laser 3D scanning, the growing point cloud model data lead to the difficulty of data storage and transmission, thus limiting its application in the body network. In order to solve this problem, the compressed sensing technique is applied to the compression and reconstruction of human body point clouds model to perform data simplification processing by the improved three-dimensional grid method before compression. In light of the characteristics of human point cloud data, the block sparse transformation and orthogonal matching pursuit algorithm is applied to reconstruct the original model. The final experimental error is only  , which confirms the validity and feasibility of the algorithm.

    Design and Application of Intelligent Park Management System Based on Cloud Platform
    ZHU Lihui
    . 2016, 29(7):  75. 
    Abstract ( 390 )   PDF (1118KB) ( 605 )  
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    With the development of modern communication and Internet, in order to satisfy the requirement of Wisdom park construction, this paper explores the model of the park under the cloud platform and a management system is designed. The management system uses sensor networks, Internet of things, the Internet and other network for transmission of information, improving the productivity and competitiveness of the park.

    Real-time Face Detection and Tracking Based on Android Platform
    YU Shiqiang,YING Jie
    . 2016, 29(7):  78. 
    Abstract ( 405 )   PDF (1126KB) ( 298 )  
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    Aiming at the low efficiency and high error rate from Android smartphone original face detection system, this paper proposes a method of transplanting OpenCV(Open Source Computer Vision Library) to Android platform, using improved AdaBoost algorithm combined with OpenCV Library to realize real-time face detection and tracking on embedded Android platform. The experiment achieved 9505% detection accuracy rate and 5013 ms average detection speed, it is more effective and practical than Android original face detection system at almost the same detection speed.

    Research on Image Denoising Method Based on Wavelet Transform
    XIANG Rui, WANG Li
    . 2016, 29(7):  82. 
    Abstract ( 397 )   PDF (1286KB) ( 245 )  
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    An image denoising method based on wavelet transform is proposed to solve gaussian noise, salt and pepper noise and mixed noise in the image. Experiments with different denoising sequences by using the combination of BayesShrink and median filtering methods are performed to improve the quality of image denoising. Experimental results show that BayesShrink followed by median filtering offers better denoising results than other methods. The method has the actual application value in image denoising processing.

    A New Two-step Automatic Segmentation Scheme for Medical Images
    HE Jing, CHEN Sheng
    . 2016, 29(7):  85. 
    Abstract ( 395 )   PDF (721KB) ( 300 )  
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    This paper proposed a new image segmentation scheme to solve the manual segmentation by and the poor accuracy of existing image segmentation methods. Firstly, the massive-training artificial neural networks (MTANNs) are employed to suppress bones in the lungs, using artificial neural network trained on a large scale of standard chest radiograph of the ribs, clavicle, such as inhibition of bone structure. Then active contour model (ACM) based on region, or the Snake Mode, is adopted to segment correctly images with non-uniform brightness. A comparison with images manually segmented by medical personnel and rated by radiologists shows that the average score of the original images is 20 points while that by our improved segmentation method is 34 points.

    A Trusted Operating System Boot Method Based on BIOS Authentication
    LIU Wei
    . 2016, 29(7):  88. 
    Abstract ( 392 )   PDF (760KB) ( 332 )  
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    In the broadcast television network, for host security protection systems, the effectiveness of the security protection and the security of the own procedures depend on the operating system. Based on BIOS authentication, this paper designs a trusted operating system boot method for the trust operating system to boot properly throughout the authentication on the operating system. The hidden file allocation tables (FAT) technology is adopted to prevent the operating system the data in the hard disk from being damaged. This method offers good accuracy and data security.

    Study of Omni-directional PSD Sun Tracking Sensors
    HAO Hongyang, ZHOU Hanyi, XIE Yong, LI Yun
    . 2016, 29(7):  91. 
    Abstract ( 331 )   PDF (1026KB) ( 232 )  
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    This paper introduces an approach to tracking the sun with the two-dimensional PSD sensors matching with silicon photocells to realize omni-directional highly precise sun tracking. The difference scale circuit eliminates the temperature drift error of PSD sensor. This method avoids the calculation error of calendar tracking and reduces the hardware costs of the encoders measuring the angles with good practical effect.

    Application of Polymer Dispersed Liquid Crystal
    PANG Xiaofeng
    . 2016, 29(7):  94. 
    Abstract ( 285 )   PDF (1173KB) ( 261 )  
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    Polymer dispersed liquid crystal is liquid crystal molecules in the form of droplets dispersed in the polymer, a high performance liquid thin film material is formed. This paper introduces the PDLC three application areas, a traditional large-screen liquid crystal display technology aspects curved display unparalleled advantage, and is making smart glass core material, and can be used to develop better performance of the variable optical attenuator, wave strip, lenses and optical devices and other important modulator. Finally doped nano research is to improve the performance of PDLC. Polymer-dispersed liquid crystal has a very broad application prospects, and its production process is simple, low cost, should arouse enough attention to domestic scholars to avoid future formation of monopoly of foreign technology.

    Optical Current Sensor for Measuring Grounding Fault Signal in Power Grid
    XUE Song1, XU Xiaodong1, JIANG De1, CHEN Jin2
    . 2016, 29(7):  98. 
    Abstract ( 388 )   PDF (1586KB) ( 283 )  
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    A feasible method for detecting fault signals with optical current sensors in power networks is proposed with the single-phase grounding fault current in medium-voltage power grid as an example. The mixed programming with Labview and Matlab is adopted to simulate the grounding fault current, with wavelet denoising the measured fault signals. An analysis of harmonic component of denoising signals is made, which indicates that the selection of fault line based on fifth harmonic is done correctly. Simulation and design show that the denoising fault signals are real and reliable, and that the analysis of proportion of harmonic frequency is the real reflect of the fault signal component as well.

    Analysis of Period Jitter Induced by Power Supply Noise of Phase Locked Loop
    ZHU Jian
    . 2016, 29(7):  102. 
    Abstract ( 431 )   PDF (1406KB) ( 267 )  
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    In terms of the jitter in phase locked phase loop caused by the power supply noise, the equation used to predict the peak-to-peak jitter induced by power supply noise is presented through analyzing the relation between the power supply noise, the phase jitter and the period jitter. The maximum error between the results predicted by the equation presented in this paper and simulated by HSPICE is 3%, which verifies the accuracy of this equation.

    Design and Implementation of Serial Communication Circuits Based on FPGA
    DANG Junbo1, LI Zhe1, LI Yajun2
    . 2016, 29(7):  106. 
    Abstract ( 431 )   PDF (1385KB) ( 331 )  
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    A serial communication circuit is designed by finite state machine for the requirement of data communication between computer and control system based on FPGA. The circuit realizes the communication between the control system and the computer, including the control commands and parameters the computer sends to the control system and the status information the control system sends to the computer. The communication circuit is tested by the embedded logic analyzer Chipscope in the ISE software. The results show that the circuit is stable and reliable, and can complete the function of data transmission.

    A Time-sharing Microwave Network Operated in Ku/Ka-band
    ZHANG Bo,SU Li
    . 2016, 29(7):  110. 
    Abstract ( 395 )   PDF (671KB) ( 233 )  
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    Based on the theory of microwave network, a Ka/Ku dual-band microwave network system is presented for small antenna. It has a Time-sharing function of frequency reuse which is implemented by using motor driven diverter switch. The network operates circularly polarization at Ka band, and linear polarization at Ku band. Polarization characteristics of antenna can be controlled by rotating the variable polarizer.some measurements for the feed system are done,with insertion loss of  the system less than 1 ,VSWR less than 135,and XPI more than 30 .measurement result is verified to meet the technique requirement very well.

    Design of a 04 m Plate Antenna of Satcom on the Move
    ZHANG Ruidong, NIU Chuanfeng
    . 2016, 29(7):  113. 
    Abstract ( 353 )   PDF (1427KB) ( 516 )  
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    Traditional parabolic antenna has high profile, while high speed aircraft need low profile antenna to reduce the wind resistance. A kind of Ku band “Satcom on the Move” flat antenna is designed, which has the advantage of low profile, low wind resistance and good performance. The antenna array is designed to be a 35:1 ratio rectangle which can reduce antenna height. By using high efficiency radiation unit, the antenna array is connected with strip line and waveguide which have low insert loss. The phase controlled beam scanning technique is used for azimuth tracking and program tracking for elevation. The result shows that the antenna has a height of lower than 280mm, the antenna gain is better than 33dB, and then tracking accuracy is controlled in 05dB.

    Adaptive Slope Compensation Based Pseudo-PLL for DCDC Converters
    XIU Wenliang, QI Yawei
    . 2016, 29(7):  117. 
    Abstract ( 403 )   PDF (1023KB) ( 298 )  
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    An adaptive slope compensation circuit in frequency synchronous DCDC converters is presented. Based on a pseudo phase-locked loop (PLL) structure, the slope compensation is dynamically adjusted according to the synchronized switching frequency to guarantee the stability of DCDC converters, as well as the response speed of load transient. Based on 035 μm CMOS process and Cadence software platform, simulations in the Spectre simulator verify the function of pseudo-PLL to generate adaptive slope compensation under different synchronous frequencies. Simulation results show that the proposed pseudo-PLL circuit can generate adaptive slope compensation with the frequency range 250 kHz~15 MHz, and guarantee the stability of DCDC converters.

    Application of TD-LTE Broadband Cluster Technology in Urban Rail Transit
    ZHANG Jing
    . 2016, 29(7):  120. 
    Abstract ( 290 )   PDF (1149KB) ( 278 )  
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    This paper introduces the present situation of the wireless communication system of urban rail transit and the existing problems of the current scheme, and proposes the use of TD-LTE broadband cluster technology integrated services with the scheme architecture given. the advantages of TD-LTE scheme are given by comparison with the present technology, and the key TD-LTE requirement in the multi-service integration of the train-ground wireless network is analyzed. From the transmission level, transmission delay and packet loss rate, the feasibility of the application of the TD-LTE technology in the train-ground communication of CBTC is discussed. It is concluded that the TD-LTE scheme is capable of the integrated services of urban rail transit.

    Decoupling Analysis of Multi-load Power Distribution Networks
    LIU Yongliang
    . 2016, 29(7):  124. 
    Abstract ( 403 )   PDF (1505KB) ( 232 )  
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    The traditional design method of power distribution network by using frequency domain target impedance is mainly used for the circumstance that one plane own one chip. But it no longer applies to the today’s complex power distribution networks in which multiple chips share one power plane. This paper utilizes the multiple superimposed impedances extracted from full-wave simulation software SI-wave to guide the design of complex PDN. The rational function of multiple superimposed impedance of every chip is obtained by the fitting algorithm, and then imported into the decoupling capacitor select algorithm to get the decoupling scheme of each chip. The result of experiment shows that the power noise of IC is within the allowable 5% range after adding the decoupling capacitor to the power/ground plane.

    Design of A Large Load Peak Current Mode DC-DC Converter
    LI Yang
    . 2016, 29(7):  128. 
    Abstract ( 363 )   PDF (1064KB) ( 272 )  
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    In this paper, a large load output integrated converter is designed based on the technology of DC-DC converter. For the problem of the harmonic oscillation in the peak current mode control, the slope compensation circuit is introduced. An adaptive slope compensation circuit is designed to improve the load capacity. In order to eliminate the slope compensation effect on the load capacity, a dynamic clamping circuit is introduced, which improves the chip output current capability effectively.

    A New Distributed Modeling and Decoupling Method for Multi-chip Power Delivery Network
    ZHANG Yi
    . 2016, 29(7):  132. 
    Abstract ( 347 )   PDF (1353KB) ( 277 )  
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    At the present stage more mature decoupling analyses of PDN aim mostly at the single chip and single input network, failing to meet the analysis requirements of the increasingly high-speed and highly integrated system. Based on the N-port network theory, this paper analyzes the principle of resistance increases for multi-power port PDN, introduces the new concept of multi-input impedance in order to catch the distributed characteristics of PDN current, and gives the decoupling method for complex PDN finally. The experimental results prove that the proposed decoupling scheme can reduce multi-input impedance of all the chips to below target impedance effectively to meet the requirements of the system 5% noise margin.

    Design of Power Amplifier Simulation Models Based on ADS
    ZHANG Jiayu, CHANG Shumao
    . 2016, 29(7):  136. 
    Abstract ( 401 )   PDF (1058KB) ( 408 )  
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    A power amplifier base on ADS is developed for the design of the RF power amplifiers. This circuit is designed using a transistor model; the optimal load impedance is selected by load pull simulations to determine the matching networks. The simulation shows a PAE=60% and a Pout=35 dBm at 19 GHz, indicating the simulation model is correct and reasonable.

    Design of Fiber Optic High-definition Video Transmission System Based on GTP
    MIN Yingtao, TANG Qingshan, LI Yajie, ZHONG Haili, ZENG Pengfei, LUO Zhen, CHEN
    . 2016, 29(7):  139. 
    Abstract ( 377 )   PDF (1664KB) ( 415 )  
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    To meet the needs of the long-distance, high-definition picture quality, anti-interference and stability in video transmission system, a high-speed serial transmission based on GTP is proposed to replace the conventional parallel transmission mode, implements long-distance transmission of uncompressed HD video. FPGA identifies the video formats and cached data in SDRAM after acquiring digital video data, which are converted to high-speed serial data in GTP and then transmitted via single-mode fibers at 25 Gbit·s-1. The receiver decodes, caches and displays the video data. Simulation, debugging and verification show that the system is capable of stable transmission of and real-time switching between 8 mainstream resolution videos such as 720p and1 080p.

    Cognitive Reconnaissance Radar Signal Processing Technology
    GUANG Xiaoli
    . 2016, 29(7):  143. 
    Abstract ( 392 )   PDF (1421KB) ( 242 )  
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    The research status and the system model of cognitive electronic warfare are described at the beginning, and a possible cognitive model of reconnaissance system is presented. Then based on the cognitive model of reconnaissance system, a digital channel frequency measurement method based on cognitive technology is proposed. Theoretical deduction and simulation shows that the digital channel measurement method based on cognitive technology greatly improves the signal to noise ratio and the frequency measurement accuracy compared to the traditional digital channel measurement method. And the feasibility of electronic reconnaissance based on cognitive technology is proved.

    Research on Distributed Test Interconnection Netwark Techonlogy
    GUO Xiaoyan
    . 2016, 29(7):  147. 
    Abstract ( 341 )   PDF (1838KB) ( 199 )  
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    This paper takes the test interconnection system of the civil avionics system as an example to introduce a design technique of the test interconnection network. In the process of large and complex electronic system development, it is always a necessary step to implement interconnection project among distributed test facility to meet transmission quality and delay requirement of the test signals. The extensible test interconnection network showed in this paper adopts multi electrical signal adaptation technology based on optical fiber network, and the network is constructed by the core equipment: fiber switch and signal conversion device. Finally the test analysis of the prototype system shows that in the case of ensuring the quality of the signal, the transmission delay is no more than 60μs.

    A Small Electric Vehicle Charging Machine Design
    CHEN Linlin,YU Huishan,WANG Chong
    . 2016, 29(7):  151. 
    Abstract ( 377 )   PDF (1559KB) ( 301 )  
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    Fast charging is the key technology of the current small electric cars need to be addressed. This pa-per has developed a smart electric vehicle fast charger, the charger uses MC9S12XE100 microcontroller-based dual closed-loop control of a multi-mode adaptive charging mode for charging. Were the main circuit parameters, in-cluding power management selection, transformer design, circuit design to absorb and filter circuit design, PWM control circuit design, microcontroller core circuit design. Finally, the test proved that the design of the charger reaches the performance requirements, the main circuit topology and control circuit is feasible.

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