2016 No. 09-Application of Electronic Technique

Special Column-Electronic Techneque of UAVs

Optimize driving system of direct current motor for multiple rotor unmanned aerial vehicle

DOI：10.16157/j.issn.0258-7998.2016.09.001

Author：He Shuai1，2，Pei Xinbiao1，2，Gong Xun1，Xu Dongfu1，2，Bai Yue1，Xu Zhijun1

Author Affilications：1.Changchun institute of optics，Fine mechanics and Physics，Chinese Academy of Sciences，Changchun 130033，China； 2.University of Chinese Academy of Sciences，Beijing 100039，China

Abstract：To enhance the driving system reliable. This article control the motor by three-phase fully-controlled bridge H_PWM_ON_L_ON. Use the principle of back electromotive force zero-crossing testing, the relationship between the floating phase terminal end voltage and midpoint voltage in DC link of three phases’ back electromotive force was analyzed. Choice power MOSFET to be the switching devices. Use three IR2101 chip to drive six composite power for realizing the change of phase. The cruising time of unmanned aircraft that using this driving system extended 20% than the usual H-bridge system. This system can even running stable at -25 ℃. The response rate of this system enhance 10%.

Key word：
brushless direct current motor

three-phase fully-controlled bridge

composite power tube

IR2101

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Research of UAV target tracking based on CamShift fused local feature matching

DOI：10.16157/j.issn.0258-7998.2016.09.002

Author：Liu Yawei，Li Xiaomin，Yang Sen

Author Affilications：Department of UAV Engineering，Ordnance Engineering College，Shijiazhuang 050003，China

Abstract：A target tracking method based on CamShift fused local feature matching has been introduced aimed at the problem caused by the single tracking characteristics of CamShift, which make the tracking algorithm be sensitive to similar target of color and shelter. The experimental results show that BRISK show the good performance in feature detection and feature description. The algorithm of CamShift fused local feature matching improves the sensitivity of interference of color similar target and shelter. The improved algorithm makes the target tracking more accurate by the common location of color information and local characteristics.

Key word：
UAV

CamShift

BRISK

target tracking

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Wideband DS-Signal capture scheme based on parallel processing technology

DOI：10.16157/j.issn.0258-7998.2016.09.003

Author：Zhang Dezhi，Zeng Xingxing，Hu Qian

Author Affilications：China Academy of Launch Vehicle Technology R&D Center，Beijing 100076，China

Abstract：The rate of wideband spread spectrum signal is up to 150Mcps, which cause the traditional capture method can not work under this rate. A fast algorithm based on parallel signal processing technique is proposed to solve this problem. Local carrier and PN code is generated by means of parallel NCO, which can achieve 600 MHz equivalent sample rate. Inside PN code achieve phase alignment by sliding code phase. Out side PN code achieve phase alignment by match filter. The proposed algorithm is feasible and can achieve fast acquisition of wideband spread spectrum signal.

Key word：
parallel process

wideband DS-signal

fast capture

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Research on GPS orientation attitude measurement system

DOI：10.16157/j.issn.0258-7998.2016.09.004

Author：Wang Jianzhong，Yang Lu

Author Affilications：Department of Information Engineering，Chongqing Youth & Vocational College，Chongqing 400712，China

Abstract：Required by real-time motion carrier attitude measurement, this research uses two GPS modules to receive satellite carrier phase measurements synchronously,uses GPS carrier phase differential technique to search two-dimensional traversal satellite data, and builds a ambiguity function for quick search. Then the research calculates baseline vector length between two antenna central points based on the least squares method,and quickly compute relative reference angles of heading, rolling and pitch.The experiment proves that under the baseline of 3 m, the heading accuracy has reached 1.5 mil, and directional time generally takes about 1 minute while under 6 m baseline, heading accuracy has reached 1 mil, and directional time only takes 1 minute.

Key word：
GPS

carrier phase difference

integer ambiguity

attitude

least square method

View(9538)

Design and implementation of path planning and visual simulation system for UAV

DOI：10.16157/j.issn.0258-7998.2016.09.005

Author：Yang Lichun，Gu Yingyan，Tao Mingming

Author Affilications：Jiangsu Automation Research Institute，Lianyungang 222061，China

Abstract：In order to promote UAV′s capacity of automatic tasks, to reduce the actual test investment and the risk of development, to simulate flying and task execution process and shorten the development cycle. Based on a certain type of UAV flight characteristics, a set of interactive UAV path planning and visual simulation system that is an important part of UAV simulation system was developed to solve the complex flight environment modeling for path planning and to establish big range of 3D real scene. The experimental simulation results show that the path planning module of system can be rapid and accurate planning out the optimal path according to the requirement of different environment, and the visual simulation module can intuitive show real 3D scene and UAV′s flight characteristics. The system can meets the requirements of path planning of UAV flight task and visual simulation validation.

Key word：
path planning

layer probability roadmap method

A* algorithm

visual simulation

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Review and Comment

Analysis of key common technologies in military IP core standards system

DOI：10.16157/j.issn.0258-7998.2016.09.006

Author：Wang Dong1，2，Chen Lan1，2，Feng Yan1，2

Author Affilications：1.Institute of Microelectronics of Chinese Academy of Sciences，Beijing 100029，China； 2.Beijing Key Laboratory of Three-Dimensional and Nanometer Integrated Circuit Design Automation Technology， Beijing 100029，China

Abstract：Based on the present situation of military IP core standards system，considering the applicability of existing standards for military IP core，and according to the requirement and characteristic of military application，the key common technologies of military IP core are studied and analyzed, such as deliveries demanding，quality evaluation，test methodology，reliability test and inspection，which can provide suggestion and technical guidance for establishing and consummating the military IP core standards system．

Key word：
military IP core

standards system

common technology

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Microelectronic Technology

Design of parallel test controller applied to multiple clock domains

DOI：10.16157/j.issn.0258-7998.2016.09.007

Author：Jiao Fang，Zhang Yue，Yan Yunyao，Yan Wei

Author Affilications：School of Software & Microeletronics，Peking University，Beijing 100871,China

Abstract：This article combining the IEEE 1149 TAP controller concept and IEEE 1500 wrapper concept to design a test controller that based on IEEE 1500 standard and compatible with IEEE 1149 test standard .It also has the function that parallel configured the general register in different clock domain to improve the test efficiency. The results of verdi simulation diagram show that the test structure to achieve the desired.

Key word：
IEEE1500 standard

IEEE1149 standard

TAP

wrapper

test

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Study on shot noise detection method in nano devices

DOI：10.16157/j.issn.0258-7998.2016.09.008

Author：Chen Xiaojuan1，Che Xiaolei2，Wu Jie3

Author Affilications：1.College of Electronica and Information Engineering，Changchun University of Science and Technology，Changchun 130022，China； 2.Institute of Information Engineer，Northeast Dianli University，Jilin 132012，China； 3.School of Electronic & Information Engineering，Beihua University，Jilin 132013，China

Abstract：To deal with the shortcomings of denoising methods for nano devices shot noise, this paper studies the variance characteristics of shot noise signal in different states and proposes an improved algorithm for empirical mode decomposition(EMD). The algorithm can adaptively select the IMF layer which need to be processed, according to the relationship between the maximum variance of IMFs with the corresponding layers. At the same time, it is integrated with the classical average algorithm, then the shot noise signal is separated from the noise effectively. The results show that under different degrees(≥-3.92 dB) low-frequence noise environment, with traditional rigid EMD de-noising method comparison, it improves the signal to noise ratio 5.4 dB～7.0 dB, the mean square error is reduced by more than 36%, this method effectively removes low-frequency noise,and increases the effectiveness of the shot noise detection.

Key word：
nano devices

shot noise

EMD

classical average algorithm

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Application and simulation analysis of AD9957 in radio frequency digital HF transmitter

DOI：10.16157/j.issn.0258-7998.2016.09.009

Author：Zhang Hao，Wang Yongbin，Zhou Andong，Fu Tianhui

Author Affilications：College of Electronic Engineering，Naval University of Engineering，Wuhan 430033，China

Abstract：First of all, giving a brief introduction to the main function of RF digital HF transmitters as well as the basic principles of the AD9957 chip, then proposing a scheme that realize quadrature digital up convert module and the digital to analog conversion module based on AD9957 chip in the RF digital HF transmitters, having a simulation and analysis about the application part of AD9957 in the HF transmitter by System View software, finally presenting a complete simulation circuit diagram of the baseband processing, quadrature digital up convert and digital to analog conversion.

Key word：
AD9957

System View simulation

HF RF digitalization

View(11822)

The design and implementation of DSC high speed decoder based on FPGA

DOI：10.16157/j.issn.0258-7998.2016.09.010

Author：Long Kuicheng，Qing Linbo，He Xiaohai，Lv Shun

Author Affilications：School of Electronics and Information Engineering，Sichuan University，Chengdu 610064，China

Abstract：The algorithm is adopted and implemented on FPGA,whose name is Normalized min-sum algorithm, multiplication of the algorithm could be converted into shift and addition operation,through selecting the suitable normalized factor.The optimal decoding iteration number could be obtained, through simulating the algorithm in Additive White Gaussian Noise channel.Besides, the quantization bits could be determined through simulating and resource of Xilinx XC7VX485T. Then a DSC decoder which is new and high-speed and partly parallel could be designed based on the algorithm and three parameters.The decoder extremely realizes the balance of decoding efficiency,decoding complexity and the utilization of FPGA resource.And the decoder has been realized on Xilinx XC7VX485T chip,whose throughput rate could up to 197 Mb/s.

Key word：
DSC decoder

FPGA

partly parallel

normalized min-sum algorithm

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Design of low temperature drift oscillator with process trimming

DOI：10.16157/j.issn.0258-7998.2016.09.011

Author：Wang Huili，Feng Quanyuan

Author Affilications：Institute of Microelectronics，School of Information Science & Technology，Southwest Jiaotong University，Chengdu 611756，China

Abstract：A compensation method about on-chip CMOS oscillator was proposed to solve frequency deviation problem across the temperature and process variation. A reference voltage generated a NTAT current on resistor with positive temperature coefficient, which was compensated with PTAT current from band gap reference cell. By temperature compensation, the current with low temperature coefficient was used to charge capacity. Digital trimming capacitor circuit was designed to reduce the output frequency drift due to process variation. Simulation results showed that the oscillator output a 1 MHz clock with 50% duty cycle, which drift less than 0.8% across the temperature range of -40 ℃～125 ℃ and less than 1.23% for three different process corners. The oscillator was insensitive to process and temperature, and showed high stability thus.

Key word：
oscillator

temperature compensation

process drift

capacitor trimming

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Constraint repetition inspection for XFA on FPGA

DOI：10.16157/j.issn.0258-7998.2016.09.012

Author：Mai Taotao，Pan Xiaozhong，Wang Yaqi

Author Affilications：Key Laboratory of Network and Information Security of the CAPF，Department of Electronic Technology， Engineering University of the CAPF，Xi′an 710086，China

Abstract：Aiming at the space explosion and mismatching problems posed by complex constraint repetitions in regular expression. This paper designs a FPGA-based hardware constraint repetition inspection block. Combining with the interleaved ROM block, this block can quickly achieve constraint repetition detection and matching. By defining constraint-repetition-parameter-memory, the counting block consumes only a small amount of hardware resources to achieve constrained duplicate detection matches. Experimental results for module that the counting block can reach Gbps throughput and the regular expression rule storage space compression by more than 50%.

Key word：
constraint repetition

FPGA

interleaved ROM

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Embedded Technology

Design and realizing of satellite signal simulator based on DSP+FPGA

DOI：10.16157/j.issn.0258-7998.2016.09.013

Author：Jiang Canhui1，2，Sun Xiyan1，2，Yan Suqing1，2，Ji Yuanfa1，2

Author Affilications：1.School of Information and Communication，Guilin University of Electronic Technology，Guilin 541004，China； 2.Guangxi Key Laboratory of Precision Navigation Technology and Application，Guilin 541004，China

Abstract：In order to provide replicable satellite signal with high precision and stability to the test of satellite navigation receivers, the satellite signal simulator is designed. The system takes DSP+FPGA as the core chip, and integrates RF up-conversion circuit, high speed D/A converter, Flash chip and SDRAM chip. The system could simulate dual-mode and multi-frequency satellite signal, which includes GPS L1, BDS B1I, BDS B2I and BDS B3. The satellite navigation signal generated by the hardware platform has been tested using commercial navigation receivers, and the correctness of the design of satellite signal simulator is verified by the positioning results, which suggests the design requirements are achieved.

Key word：
GPS

BDS

satellite signal simulator

FPGA

DSP

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A method of FPGA dynamic configuration based on TMS320C6A8168

DOI：10.16157/j.issn.0258-7998.2016.09.014

Author：Zhang Demin，Tong Qing，Liu Yijing，Zhufu Wengang

Author Affilications：Key Laboratory of Mobile Communication Technology of Chongqing， Chongqing University of Posts and Telecommunications, Chongqing 400065，China

Abstract：Aiming at the problem of speed and flexibility in traditional FPGA booting allocation in baseband processing system, this paper presents a method of dynamic loading FPGA configuration file through SD card and network based on TMS320C6A8168. The program has embedded system platform composed of four pieces of FPGA and an ARM C6A8168 processor, by modifying the U-boot code makes the baseband system selectively load FPGA configuration file in PC when running the U-boot, so that the FPGA can complete the corresponding physical layer algorithms and hardware acceleration. It effectively achieves the configuration of the FPGA, improves the flexibility of the FPGA system configuration, and has a good application prospects in the base band processing system.

Key word：
TMS320C6A8168

FPGA

SD card

baseband processing system

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No keyboard electronic lock design based on image recognition

DOI：10.16157/j.issn.0258-7998.2016.09.015

Author：Sun Qihao，Zhan Jie，Zhang Hao

Author Affilications：College of Physics and Electronic Science，Hunan University of Science and Technology，Xiangtan 411201，China

Abstract：Lock has always been daily necessities. With the development of the social economy and the progress of the science and technology, the higher public requirements on the safety and convenience of lock bring the electronic lock which combines ARM technology with image recognition. This electronic lock collects the key information through camera and then validate the key information by controller decoding information. It has fewer system components, lower hardware dependencies and higher transportabilities. Also, it is easy to use and can constantly update the unlock mode.

Key word：
electronic lock

image collect

image positioning

STM32F407

Python

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The research of spacecraft navigation system based on pulse signal from pulsars

DOI：10.16157/j.issn.0258-7998.2016.09.016

Author：Zhai Qianqian1，Tang Haifeng1，2，Ma Kun1

Author Affilications：1.Faculty of Science，Kunming University of Science and Technology，Kunming 650500，China； 2.Xi′an Institute of Optics and Precision Mechanics，Chinese Acadenny of Sciences，Xi′an 710119，China

Abstract：Pulsars are neutron stars, with 107-109t magnetic field, rotating rapidly, and radiate electric pulse signal periodically. Aircraft positioning and attitude adjustment can be realized by identifying the pulse contour. In this paper, experiment collects TDC data from the X-ray ground simulation facility while the moment of photons reach, then puts TDC data to PC via USB to revert pulse profile. Finally, producing B0531-galaxies pulse signals by using the X-ray ground simulation system in Xi'an Institute of Optics and Precision Mechanics of CAS, the similarity between the pulse profile data restored from experiment and downloaded from NASA is 95.38%.

Key word：
X-ray pulsar navigation

TDC

TOA

rough time

fine time

pulse profile revert

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Measurement Control Technology and Instruments

The software anti-interference method of high-speed visual online detection system

DOI：10.16157/j.issn.0258-7998.2016.09.017

Author：Yuan Weiqi1，Wei Zhipeng1，Li Dejian1，Zheng Dawei2，Zhang Junpeng1

Author Affilications：1.College of Information Science and Engineering，Shenyang University of Technology，Shenyang 110870，China； 2.College of Physics and Information Engineering，Fuzhou University，Fuzhou 350108，China

Abstract：Machine vision online detection is an emerging detection method based on computer vision and image processing. The method, which captures the tested image with the help of camera, gets describable parameters of the measure object by image processing techniques, and ultimately applied in actual test, measurement and control after parsing and judging the parameters, has the features of non-contact, high accuracy, wide application range and high degree of automation. Aiming the interference issues, encountered by the system itself, the difference of load and user operation existed, now in the situation of multi-threaded, high speed and multi-camera visual online detection system is proposed in this paper. Finally experiments show that the method makes the detection speed of high-speed visual on-line detection system increase by 70%，and provides a guarantee of high speed and stable operation for high-speed visual on-line detection system.

Key word：
high speed

online detection

anti-interference

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A design of component-based measurement and control platform for wind tunnel

DOI：10.16157/j.issn.0258-7998.2016.09.018

Author：Luo Changjun，Ma Yongyi

Author Affilications：China Aerodynamics Research and Development Center，Mianyang 621000，China

Abstract：In order to improve the scalability and reusability of the wind tunnel measurement and control system, and shorten the developing cycle of the software, this paper summarized the universal of the platform for measurement and control system. Based on the object-oriented theory and system architecture design, this paper proposed the hierarchy of the component-based software platform for wind tunnel measurement and control system, analyzed the components division, component communication mode/interfaces and components package of the custom layer structure and function implementation layer, and discussed the control software platform′s prototype system basing on components. All of the above provided a new idea which could further the universal of the measurement and control system.

Key word：
wind tunnel

measurement and control platform

component

XML

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Comparative analysis of spectroscopic scattering reduction methods based on Monte Carlo simulation

DOI：10.16157/j.issn.0258-7998.2016.09.019

Author：Lv Bo，Wang Yongming

Author Affilications：School of Engineering，University of Shanghai Normal University Tianhua College，Shanghai 201815，China

Abstract：Light scattering is one of the main reasons of the inaccurate spectroscopic measurement and analysis. The Lambert-Beer law no longer exists at the presence of scattering. Three simple scattering reduction methods, such as polarization subtraction, added absorber and spatial filtering methods, are compared here based on Monte Carlo simulation. Three methods are applied to select weakly scattered photons from a scattered light background and then linearize the relationship between light attenuation and absorption coefficients. The degree of the desired linearity of this relationship is determined by the variance of the optical path lengths. Weakly scattered photons have undertaken shorter path lengths, the mean and variance of the path lengths are closer to the thickness of the medium and zero, respectively, while the light intensity is inevitably lowered. Three methods are compared with respect to the temporal responses, relationship between attenuation and absorption, variances of the path lengths and light intensity. It is demonstrated that polarization subtraction method provides the optimum performance among three methods.

Key word：
polarization subtraction

added absorber

spatial filtering

Monte Carlo

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The modeling analysis and system design of rotational inverted pendulum based on single chip microcomputer control

DOI：10.16157/j.issn.0258-7998.2016.09.020

Author：Zeng Xianyang1，2，Yang Hongli3，4，Yu Hanqi1，Chu Nanfeng1

Author Affilications：1.Industry Center，Nanjing Institute of Technology，Nanjing 211167，China； 2.Department of Mathematics，Nanjing University，Nanjing 210093，China； 3.Department of Mathematics and Physics，Nanjing Institute of Technology，Nanjing 211167，China； 4.School of Atmospheric Sciences，Nanjing University，Nanjing 210093，China

Abstract：Structure of rotational inverted pendulum is simple, but the control system is more complicated. This paper introduces the structure of rotational inverted pendulum, Lagrange equation in analytical mechanics linear mathematical model of rotational inverted pendulum is established, the formula and a more accurate equation of state description are deduced, and the instability and controllability of rotational inverted pendulum are analyzed. The control system hardware circuit and software programming are designed. The control process of the system for data acquisition, graphic display, swinging rod is analyzed from natural prolapse to set up the whole process of 180° handstand. System control uses the discrete PID algorithm to ensure the stability of the system. And the infusion of the Kalman filtering algorithm filters the possible jamming signal, which ensures the accuracy of the data.

Key word：
rotational inverted pendulum

Lagrange

mathematical model

Kalman filter

PID control

View(21042)

Reliability of PLC system using different redundant structure

DOI：10.16157/j.issn.0258-7998.2016.09.021

Author：Meng Jun

Author Affilications：Shenhua Group Corporation Limited，Beijing 100011，China

Abstract：Redundant PLC system is the important way to improve the reliability of industrial control system, which was widely used in many fields as an excellent fault-tolerant solution. However, suitable selection of redundant structure according to the practical application was an inevitable problem in the actual application environment. The reliability and MTBF(Mean Time Between Failures) of single element system, parallel redundancy, triple-module redundancy and double 2-vote-2 redundancy system are analyzed based on basic reliability theories, and the relationship between reliability, MTBF and failure rate of different redundant structure were discussed. The research achievements can provide effective theoretical guide for suitable selection of redundant structure in practical applications.

Key word：
PLC

redundancy

reliability

MTBF

fault-tolerant technology

availability

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Communication and Network

A reformed TDMA protocol fitted for dynamic topology

DOI：10.16157/j.issn.0258-7998.2016.09.022

Author：Du Jing，Xi Yong，Huang Shengchun

Author Affilications：School of Electronic Science and Engineering，National University of Defense Technology，Changsha 410073，China

Abstract：To satisfy the requirements for ad hoc tactical communications network fast dynamic networking, based on the classic USAP protocol, the E-USAP protocol adapted to dynamic topology is proposed. By employing a distributed slot assignment method schemes, the proposed protocol reduces control information exchange cycle by increasing the number of control slots in the frame structure, and can respond quickly to dynamic topology changes. The analysis and simulation indicate the reformed protocol can reduce the networking time under the conditions of static topology，and present good performance on throughput and delay and can better respond to ad hoc network topology changes under the conditions of dynamic topology.

Key word：
USAP

distribution

slot assignment

dynamic topology

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Multi-hop network data broadcast protocol based on adaptive selection gossiping probability

DOI：10.16157/j.issn.0258-7998.2016.09.023

Author：Yuan Fen1，Tao Lin2，Xu Congfu3，Wei Linjing4

Author Affilications：1.Department of Computer and Information Technology，Zhejiang Changzheng Vocational & Technical College， Hangzhou 310023，China； 2.Department of Electronical and Information Engineering，Henan Polytechnic Institute，Nanyang 473000，China； 3.College of Computer Science and Technology，Zhejiang University，Hangzhou 310027，China； 4.College of Information Science and Technology，Gansu Agriculture University，Lanzhou 730070，China

Abstract：Mobile Ad Hoc wireless network nodes took up a lot of network resources and the energy cost of the larger broadcast information in the broadcast packet information. To solve these problems, a multi-hop network data broadcast protocol based on adaptive selection gossiping probabilistic is proposed. The protocol defines the gossiping probability based on the number of network nodes and node density distribution of the average neighbor, to reduce the cost of the broadcast information. It adds the ability to select an adaptive gossiping probability, and excludes the nodes will bring node transmission interruption from the candidate neighbor nodes. Simulation results show that compared with gossiping routing protocols, perceived opportunities transmission Ad Hoc routing protocols and lightweight mobile Ad Hoc network active source routing protocols, the network total energy consumption decreases by 32.5%, 14.6% and 2.1%，and can reduce packet loss rate and reduce packet transmission delay well.

Key word：
Ad Hoc networks

data broadcast protocol

adaptive selection gossiping probability

energy analysis

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PTTC：Clustering algorithm for Wireless Sensor Networks

DOI：10.16157/j.issn.0258-7998.2016.09.024

Author：Wang Zhichao

Author Affilications：Department of Information and Engineering，Wuchang University of Technology，Wuhan 430223，China

Abstract：Clustering in WSNs is an effective technique for prolonging the network lifetime. Therefore, Prim based tree topology Clustering algorithm for wireless sensor networks(PTTC) is proposed in this paper. PTTC algorithm decides optimal number of clusters, and calculate the probability of optimum number of cluster head. After that, PTTC algorithm introduces current energy and the count that the node has been selected as CH to stochastically select the CH. Finally, the tree in cluster is computed by Prim algorithm, and the data is transmitted among tree. This improves the energy efficient and longer network lifetime. Simulation shows that PTTC algorithm effectively reduces and balances the energy consumption among the nodes, and thus significantly extends the network lifetime.

Key word：
Wireless Sensor Network

Clustering

energy

tree

Prim

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Unknown network applications traffic classification algorithm based on improved TSVM

DOI：10.16157/j.issn.0258-7998.2016.09.025

Author：Li Bin，Li Lijuan

Author Affilications：Department of Information Engineering，Shijiazhuang Vocational Technology Institute，Shijiazhuang 050081，China

Abstract：An unknown network protocol classification method based on improved transductive support vector machine learning is proposed to solve the problem of classifying augmented class when unknown network protocol data appeared in the training process. This method uses the large number of unlabeled samples to assist training classification model, where the augment loss of new unknown class samples is described by the loss augment function. TSVM(Transductive Support Vector Machine) optimization model is established and its solving process is deduced, so the decision boundary can classify the unknown class samples. The performance of the proposed method is examined in simulations with real network data sets. The experimental results illustrate the feasibility and effectiveness of the unknown network applications classified by this proposed method.

Key word：
support vector machine

transductive learning

unknown network protocol

traffic classification

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Customer evaluation based trust model in cloud service

DOI：10.16157/j.issn.0258-7998.2016.09.026

Author：Liu Dafu1，Su Yang1，2，Xie Hongan1，Yang Kai1，2

Author Affilications：1.Key Laboratory of Network and Information Security of CAPF，Xi′an 710086，China； 2.The Institute of Information Security，Engineering University of CAPF，Xi′an 710086，China

Abstract：Since the lack of building trust and evaluating means between service provider and consumer in the environment of cloud service，a customer evaluation based trust model(CETrust) was proposed. Firstly, an attribute reduction algorithm was put forward to reduce the evaluation data based on rough set. Secondly, the consumer filtration algorithm based on evaluation similarity was used to improve calculation accuracy. Then, with customer′s credibility fully considered, this model evaluated trust degree combined overall evaluation with sub-item attribute evaluation. Finally, the comprehensive trust degree was calculated through third party′s appraisal and accreditation results. Compared with the existing models, the simulation result shows that the reduction algorithm maintains the accuracy of trust degree calculation. CETrust can filter malicious evaluation to get comprehensive evaluation results that reflects cloud service′s credibility.

Key word：
cloud service

trust model

evaluation filtration

attributes reduction

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Massive MIMO signal detection based on SSOR method

DOI：10.16157/j.issn.0258-7998.2016.09.027

Author：Hua Quan，Wang Qian，Shen Bin，Zhao Shufeng

Author Affilications：Chongqing Key Lab of Mobile Communications，Chongqing University of Posts and Telecommunications，Chongqing 400065，China

Abstract：For massive MIMO systems, conventional minimum mean square error(MMSE) linear detection algorithm can achieve nearly optimal performance when the number of antennas at the base station(BS) is much larger than the number of single-antenna users. But the MMSE detection algorithm involves complicated matrix inversion, thus making it difficult to implement rapidly and effectively. In this paper, a modified MMSE algorithm is proposed, which exploits the channel characteristics occurring in massive MIMO channels and using the symmetric successive over-relaxation(SSOR) method to avoid the matrix inversion. To guarantee the performance of SSOR-based signal detector in practice, a proper quantified relaxation parameter and initial solution for SSOR-based signal detector are proposed too. In addition, from the perspective of algorithm implementation, the channel estimation scheme is adopt, which used in channel hardening-exploiting message passing(CHEMP) receiver. Simulation results verify that the proposed algorithm can achieve its performance quite close to that of the MMSE algorithm with only a small number of iterations.

Key word：
massive MIMO

minimum mean square error

matrix inversion

symmetric successive over-relaxation

channel hardening-exploiting message passing

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A robust AOA positioning algorithm based on GDOP-weighted intersection

DOI：10.16157/j.issn.0258-7998.2016.09.028

Author：Kong Fanzeng，Ren Xiukun，Zheng Nae

Author Affilications：The PLA Information Engineering University，Zhengzhou 450002，China

Abstract：Given that the existing weighted intersection AOA positioning algorithm causes low accuracy and undesirable adaptivity due to the inconsiderateness of bearing line intersection, a method called a robust GDOP-weighted intersection AOA(RGWIAOA) is proposed in this paper. The algorithm mentioned in the paper obtains all the bearing line intersections based on the AOA measurements to blind node from anchor node, confirms the valid intersections by using Circular Error Probable(CEP),assigns the corresponding weight to the valid intersections in accordance with the Geometric Dilution of Precision(GDOP) of the valid intersections, and conducts weighted summation for the valid intersections for position estimation of the blind node. The RGWIAOA method uses the standard deviation of the AOA measured value, and also gives consideration to the anchor node position error in the calculation of GDOP, which enables the method to be with strong robustness. The simulation result shows that the RGWIAOA method has better adaptivity and higher positioning accuracy in different application scenarios compared with the existing method.

Key word：
localization

WSN

AOA

GDOP

Cramér-Rao lower bound(CRLB)

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Computer Technology and Its Applications

The research of data mining technologies based on Hadoop on the application of photometric redshifts

DOI：10.16157/j.issn.0258-7998.2016.09.029

Author：Qian Weiyang1，Wang Junyi2，Qiu Hongbing2

Author Affilications：1.School of Information and Communication，Guilin University of Electronic Technology，Guilin 541004，China； 2.Key Laboratory of Cognitive Radio &Information Processing，Guilin University of Electronic Technology，Guilin 541004，China

Abstract：The amount of astronomical data quickly grows by exponential middleweight, making astronomical data mining face unprecedented challenges. The rapid development of distributed cluster technologies and cloud computing platforms provides new research ideas and methods for massive data processing and analysis. Of them, the distributed cluster technology Hadoop is a meteoric rise, and shows comparative advantages in terms of iterative machine learning and interactive data mining applications. This paper uses the latest release of Sloan Digital Sky Survey hotometric data set to explore the suitability and application problems of the data mining technologies based on Hadoop on the massive astronomical survey data, providing new means and methods for massive astronomical data mining.

Key word：
data mining

machine learning

Hadoop

MLPQNA

photometric redshifts

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Construction and implementation of Vivado HLS embedded real-time image processing system

DOI：10.16157/j.issn.0258-7998.2016.09.030

Author：Zhang Yanhui1，Guo Mingyu2，He Bin1

Author Affilications：1.College of Information Science and Technology，Beijing University of Chemical Technology，Beijing 100029，China； 2.Beijing Institute of Satellite Environment，Beijing 100094，China

Abstract：Traditional processing platforms which are based on CPU,GPU and DSP cannot meet the requirements in real-time processing. FPGA has unique advantages in parallel image processing and provides a much more flexible option between performance and power consumption. By using Vivado High Level Synthesis(HLS),tool of Xilinx,a variable parameter laplacian image filter algorithm has been implemented. And a kind of real-time and visual embedded image processing system is constructed on the ZYNQ-7000 SoC. The experimental results of this system verify different image processing algorithm can be implemented easily on this platform,requirements of real-time，high performance and low cost can be satisfied well. This design provides reference for further high performance image processing system.

Key word：
Vivado HLS

image processing

Laplacian

ZYNQ-7000

embedded Linux

Qt

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Automatic code generation framework for heterogeneous processing platform

DOI：10.16157/j.issn.0258-7998.2016.09.031

Author：Du Hong，Peng Hua，Ma Jinquan，Yue Chunsheng

Author Affilications：College of Information System Engineering，Information Engineering University，Zhengzhou 450001，China

Abstract：To solve the Heterogeneous platform development difficulties on period and complexity,a new automatic code generation is put forward. This auto-code-generation comprises of framework configuration,element macro definition,hardware drive,component software and component assembly.Experimental results show that the auto-code-generation meets the demands of real-time,distributed processing and reliability,can ensure the consistence with the actual engineering and reduce workload on manual programming.

Key word：
automatic code generation

heterogeneous platform

Python

twin-engine

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Design of intelligent shopping system in the mode of participatory sensing based on Android

DOI：10.16157/j.issn.0258-7998.2016.09.032

Author：Zhou Jing1，Zhou Jie1，2，Du Jinglin1

Author Affilications：1.College of Electronic & Information Engineering，Nanjing University of Information Science and Technology， Nanjing 210044，China； 2.Department of Electronic and Electrical Engineering，Niigata University，Niigata 950-2181，Japan

Abstract：The design comes up with a C/S architecture intelligent shopping system by the participatory sensing manner based on Android. The system is based on the sensory data, processing data on the server and client side and showing the estimated waiting time at the mall check-out queue to the user side real-timely in the form of map visualization,graphs and pushing notifications with the aid of web-socket technology and the third party delivery service,providing the reference for users to make more reasonable shopping plan,and reducing the waste time. The experiment of the prototype system shows the effectiveness and feasibility of the system.

Key word：
participatory sensing

Android

Web-socket

push

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Face recognition based on local feature and kernel low-rank representation

DOI：10.16157/j.issn.0258-7998.2016.09.033

Author：Shou Zhaoyu，Yang Xiaofan，Li Mengya

Author Affilications：Key Laboratory of Cognitive Radio and Information Processing，Guilin University of Electronic Technology，Guilin 541004，China

Abstract：For the problem of face recognition, such as disguise, occlusion, illumination and expression changes, a face recognition based on local feature and kernel low rank representation is proposed. First, it extracts the LBP feature of training and testing sample image. Then it is projected onto the high dimensional feature space by the mapping function. The feature matrix which is projected into the high dimension space is used to extract the common features of the samples by the method of low rank representation after dimension reduction. Finally,it carries on the classified recognition based on the method of residual approximation. The experimental results show that the proposed algorithm is robust to occlusion, camouflage and illumination changes. At the same time, compared with some of current face recognition algorithms,the recognition rate of this proposed algorithm has been significantly improved.

Key word：
kernel method

feature extraction

low-rank representation

mapping function

LBP

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Power Supply Technology and Its Application

Design of ripple signal power supply based on MSP430

DOI：10.16157/j.issn.0258-7998.2016.09.034

Author：Li Longlong，Li Guofu，Chen Mo，Li Yongliang，Liu Zhifang

Author Affilications：China Electric Power Research Institute，Beijing 100192，China

Abstract：Aging test of arrester in DC transmission system needs a high voltage test power supply which can generate a kind of special ripple waveform. For this requirement, a programmable ripple waveform power supply is designed. The power supply uses MSP430 as control MCU, and uses D/A converter and amplitude control to produce high-precision reliable test ripple waveform, then uses power amplifier to amplify the voltage and power. The paper introduces the hardware principle and software structure in detail. Experimental results show that, the power supply can generate valve voltage and bridge voltage accurately, the maximum output voltage can up to 60V, and voltage stability is less than 1%, the frequency stability is less than 0.5%. The power supply can meet the test requirement of ripple waveform for arrester aging test.

Key word：
ripple signal generator

MSP430

aging test

power supply

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Sine space voltage vector flux linkage analysis and its implementation in the soft starter

DOI：10.16157/j.issn.0258-7998.2016.09.035

Author：Meng Yanjing，Gao Zeyu，Chen Jun

Author Affilications：College of Electrical and Information Engineering，Shaanxi University of Science & Technology，Xi′an 710021，China

Abstract：In order to solve the problem that the voltage regulating soft starter′s electric current reducing effect is poor，in addition, it′s lack of torque and the inverter are expensive beyond that it′s difficult to bypass, this paper analysis the frequency changing theory and flux linkage locus of space voltage vector under sine power supply breaking the dc suppling limited, apply that to the voltage regulation circuit, design multistage switching frequency soft start strategy and develop sine space voltage vector of the soft starter which has the function of step frequency changing. The MATLAB simulation verifies the validity and feasibility. Experimental results show that the soft starter can start asynchronous motor with rated load and limit the start current under the four time of the rated current.

Key word：
sine space voltage vector

flux linkage locus

soft start strategy

step frequency changing

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Analysis of series-parallel hybrid model of wireless power transmission efficiency via magnetic resonance

DOI：10.16157/j.issn.0258-7998.2016.09.036

Author：Zhang Jiechen，Li Fuhai，Chen Gang，Chen Chenxi

Author Affilications：School of Electrical and Information Engineering，Hunan University，Changsha 410082，China

Abstract：Aiming at the efficiency of wireless power transmission system via magnetic coupling resonant(RWPT)，modeled and analyzed the equivalent circuit of series-series(SS) model and series-parallel hybrid(SPPS) model by using the theory of circuit. also deduced the corresponding formula about transmission efficiency. Through the simulation, the changes about transmission efficiency of SS model and SPPS model with its distance and load were compared. Compared with the SS model, the comparative analysis shows SPPS model displays its superiority in long distance, large load and higher efficiency. More over, SPPS model can adjusted the matching capacitance value to achieve higher transmission efficiency in different transmission distance. The theoretical analysis and simulation is verified by building experimental platform.

Key word：
wireless power transmission

magnetic resonance

series-series model

series-parallel hybrid model

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