2017 No. 06-Application of Electronic Technique

Special Column-Aerospace Electronic Technology

Design of mercury-lamp source for solar irradiance spectrometer spectral calibration

DOI：10.16157/j.issn.0258-7998.2017.06.001

Author：Zhang Heng，Ma Qingjun，Wang Longqi，Wang Shurong

Author Affilications：Changchun Institute of Optics，Fine Mechanics and Physics，Chinese Academy of Sciences，Changchun 130033，China

Abstract：In order to satisfy the requirement of solar irradiance spectrometer spectral calibration on the satellite, a mercury-lamp source is designed based on its characteristics which can be described as high voltage to glow and low voltage for work. The single-ended flyback topological structure and four level dual voltage rectifier are used to provide the high glowing voltage. And the degenerative feedback is designed to current constant. The glowing voltage and working voltage can be switched automatically without the microcontroller. Both the usability and the reliability in low temperature of the source are improved. The experiments show that the current precision of the mercury-lamp source designed is 0.000 21, the current adjustment rate is 0.001 8, the current stabilization coefficient is 0.009. The mercury-lamp source can work reliably in low temperature and satisfy the system requirement of the load.

Key word：
solar irradiance spectrometer

spectral calibration

mercury-lamp source

single-ended flyback

current control

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Design of high-speed CMOS image storage and real-time display system

DOI：10.16157/j.issn.0258-7998.2017.06.002

Author：Ma Lin1，2，Li Jinming1，2，Zhang Huwei1，2，Hou Tianxi1，2，Jiang Shuai1，2

Author Affilications：1.National Key Laboratory for Electronic Measurement Technology，North University of China，Taiyuan 030051，China； 2.Key Laboratory of Instrumentation Science & Dynamic Measurement of Ministry of Education， North University of China，Taiyuan 030051，China

Abstract：A high-speed image storage and real-time display system is designed for telemetry system of aiming at the problems of large data volume, high-speed and inability to store display directly. The system takes the Spartan 6 series FPGA as the core processor, and uses the full mode Camera Link interface to gather the image data of CMOS camera output. The system of possessing high-speed image storage and real-time display uses technology of DDR3 Ping-Pong cache to write image data into a disk array consisting of SATA controllers as well as through Gigabit Ethernet interface upload to computer after analysis and processing. Image data is converted to the VGA resolution format of the 1 024×768 pixels in the form of pumping frames and reducing resolution. Finally the system conduct the image real-time display through the VGA interface. What the experimental results show that the system can store and display the high-speed image data with 2 048×2 048 pixels and frame frequency with 150 f/s resolution.

Key word：
CMOS camera

FPGA

disk array

Gigabit Ethernet

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Design of file-based bad block management of high-speed large-capacity space-borne storage

DOI：10.16157/j.issn.0258-7998.2017.06.003

Author：Yang Zhiyong1，2，Dong Zhenxing1，2，Zhu Yan1，2，Dong Wentao1

Author Affilications：1.National Space Science Center，Chinese Academy of Sciences，Beijing 100190，China； 2.University of Chinese Academy of Sciences，Beijing 100190，China

Abstract：In order to ensure high-speed stable storage rate of high-speed large-capacity space-borne storage, we must to manage the bad blocks that occur when writing because of single particle flipping and exceeding erase limits in NAND Flash chip. File-based bad block management links all bad blocks of four-level pipeline into one file, links unused blocks of four-level pipeline into four separate files, and links used blocks into many different payload files. In addition, adopting a four-level pipeline ping-pong buffer mechanism replaces the write failure blocks fast. The file-based bad block management, which runs in the model task, resolves the problem of storage rate jitter when the data is written in a bad block, and stores the multi-payload data into different payload files with four times the write rate of one-level pipeline. Therefore, file-based bad block management ensures the correctness and integrity of the payload data.

Key word：
high-speed large-capacity space-borne storage

multi-payload

pipeline operation

file-based bad block management

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The research of IGP algorithms for grid ionospheric model correction in BDS

DOI：10.16157/j.issn.0258-7998.2017.06.004

Author：Yu Geng1，Qu Ge2

Author Affilications：1.School of Civil Aviation，Shenyang Aerospace University，Shenyang 110136，China； 2.School of Electronic Information Engineering，Shenyang Aerospace University，Shenyang 110136，China

Abstract：Based on the grid ionospheric correction algorithm of BDSBAS,the paper discusses how to calculate the IGP vertical ionospheric delay by the IPP vertical ionospheric and tests the grid point ionospheric vertical delay error(GIVE).The results show that grid ionospheric model is a kind of high accuracy ionospheric delay correction algorithm and the delay of ionospheric grid is the key of the grid model;selects near the IGP reference station to calculate the vertical grid delay is more accurate and is also beneficial to obtain high-accuracy ionospheric correction effect;Additionally,the correction error is in a normal range,verifies the algorithm of GIVE is workable in the area of China and can limit the grid point ionospheric delay error with a confidence level of 99.9%.

Key word：
BD navigation satellite-based Augmentation System(BDSBAS)

grid ionospheric model

grid vertical delay

GIVE

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Study on improvement of radar signal fusion recognition algorithm based on evidence theory

DOI：10.16157/j.issn.0258-7998.2017.06.005

Author：Zhao Rupeng，Tian Runlan，Wang Xiaofeng

Author Affilications：Department of Information Countermeasures，Aviation University of Air Force，Changchun 130022，China

Abstract：As evidence theory algorithms fail to identify and distinguish the complex and unstable radar signals efficiently, the improvement have be presented for the algorithm of fusion recognition based on evidence theory. Firstly, add the classification strategy to classifying the signals and use the consistency of ranking method to measuring the weight value of each parameters. Then, the improved evidence fusion rules is subsequently applied to exercise fusion processing on the similarity of parameters concerning each signal and the trust value concerning target framework of each signal in order. Finally, finish the recognition according to the final trust value. The results of simulation reveal that the improved algorithm can exert favorable effect on the distinction of unknown complex radar signals, with higher recognition rate and less consumption time, which is more fit for the actual signal fusion recognition.

Key word：
radar signals

fusion and recognition

evidence theory

classification strategy

consistency of ranking method

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Optimization design of double layer hybrid satellite network and coverage performance evaluation

DOI：10.16157/j.issn.0258-7998.2017.06.006

Author：Dai Cuiqin，Li Jian

Author Affilications：School of Communication and Information Engineering，Chongqing University of Posts and Telecommunications， Chongqing 400065，China

Abstract：We have studied the issues that poor survivability and high processing delay of single-layer satellite networks, and complex management and high link redundancy of triple-layer satellite networks, and propose an optimal design scheme of double-layer hybrid satellite network. In our proposed scheme, the networking analysis and constellation design for MEO and LEO satellites have been presented by using Walker constellation and polar orbit constellation respectively. Meanwhile, aiming at the problem that the traditional satellite coverage performance index cannot be used to evaluate the satellite constellation with different configurations generally, a unified evaluation model of satellite constellation is proposed based on Analytic Hierarchy Process(AHP). Simulation results show that the proposed scheme can not only improve the percentage of coverage, but also effectively reduce the average gap duration and average response time, so then meet the overall design requirements for all-day coverage in China.

Key word：
satellite constellation design

worst case observation point

street of coverage

analytic hierarchy process

coverage performances

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Review and Comment

The recent progress of integrated circuits for medical applications

DOI：10.16157/j.issn.0258-7998.2017.06.007

Author：Li Yan

Author Affilications：Beijing Information Science and Technology University，Beijing 100192，China

Abstract：Integrated circuits(ICs) have important applications in portable, wearable and implantable medical instrumentations and artificial organs. According to the application environment and the low frequency and small amplitude characteristics of physiological signals, the medical applications propose new challenges and requirements in reducing the power, reducing the size, achieving low cutoff frequency and increasing the reliability. In this paper, the recent progress of portable, wearable and implantable medical instrumentations and artificial organs is reviewed, the new methods and technologies are summarized, and the future of the medical ICs is analyzed.

Key word：
integrated circuit

portable

wearable

implantable

artificial organs

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A survey on orbital angular momentum antennae in wireless communication

DOI：10.16157/j.issn.0258-7998.2017.06.008

Author：Dang Weiguo，Zhu Yongzhong，Yu Yang，Zhang Yefeng

Author Affilications：Department of Information Engineering，Engineering University of People′s Armed Police，Xi′an 710086，China

Abstract：With the rapid development of wireless communication technology, spectrum resource in radio frequency is reaching Shannon Limit. Orbital angular momentum(OAM) can theoretically provide infinite orthogonal channels and use spectrum resources effectively. Basic theory of OAM is briefly introduced at the beginning of this paper, then typical forms and specific realization of OAM antennae are concluded, in which their merits and drawbacks in gain, radiation pattern, receiving and demultiplexing are focused on. Finally, common problems of present OAM antennae are summarized, and prospect of their appliance in wireless communication in near future is made.

Key word：
orbital angular momentum

antenna

wireless communication

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Microelectronic Technology

The research and implementation of polarization code decoding based on FPGA

DOI：10.16157/j.issn.0258-7998.2017.06.009

Author：Deng Yuanyuan，Qing Linbo，Wang Zhengyong，Gao Jingxi，Xu Chengqiang

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

Abstract：In the binary discrete memoryless channel, polarization code can achieve its channel capacity limit and its implementation complexity is relatively low,which is a major breakthrough in communication field,so it is a very important research significance to realize polarization code decoding in FPGA. Firstly，the SC decoding algorithm is introduced and the butterfly structure is converted into liner structure in order to improve the efficiency of decoding. Then the decoding algorithm is improved by minimum decoding, fixed- point quantifying and resources sharing so that it is easier to implement in hardware. Finally，realizes the polarization code decoding in FPGA and gives the test waveforms, while the comprehensive resource about different coding block length are also compared in this paper. The experimental results show that the decoding can reach the highest frequency 134 MHz and reach the throughput rate 35.6 Mbps.

Key word：
FPGA

polarization code

channel polarization

SC decoding

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Design of a circuit with overtemperature protection apply to LED driver

DOI：10.16157/j.issn.0258-7998.2017.06.010

Author：Cui Jingjing，Zeng Yicheng，Xia Junya

Author Affilications：Department of Microelectronics Science and Engineering，Xiangtan University，Xiangtan 411105，China

Abstract：An overtemperature protection circuit is designed whose driving current changes with the voltage of temperature self-adaptive changes. Circuit has the characteristic of hysteresis thermal-shutdown and adds the temperature self-adaptive in the constant-current output. Circuit is simple and stable relatively.Based on 0.5 μm standard CMOS technology,the circuit is simulated by Cadence Spectre. The result shows that the reference voltage with high precision,low temperature drift,and temperature coefficient is 1.6×10-5/℃. The LED driver circuit current outputs 350 mA in 0~65 ℃ and its changeable range is under 0.285%. The variation range of temperature self-adaptive current is 85 mA when the temperature changes from 65 ℃ to 108 ℃. The signal for hysteresis thermal-shutdown would be high level and the output circuit would turn off when the temperature rises up to 110 ℃. The circuit wouldn′t restart until the temperature down to 60 ℃.

Key word：
constant current output

temperature self adaptive

hysteresis thermal shutdown

LED driver

over temperature protection

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A JPEG real-time decoding optimization algorithm based on multicore DSP TMS320C6678

DOI：10.16157/j.issn.0258-7998.2017.06.011

Author：Peng Yizhi

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

Abstract：Focus on the real-time processing requirement for digital video in electronic information system applications, based on the analysis of JPEG decoding, proposes a method of multicore DSP task-level parallel implementation for the system architecture of multicore DSP, and design a JPEG decoding system based on TMS320C6678, implement decoding task-level parallel pipeline and efficient inter-core communication. Experimental results show that the real-time processing capability of JPEG decoding system based on TMS320C6678 has improved so much and broaded application prospect in the field of digital video transmission and processing of electronic information systems.

Key word：
digital video

JPEG

multicore DSP

TMS320C6678

real-time

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Design and implementation of X-band single road′s frequency mixer channel based on MEMS filter

DOI：10.16157/j.issn.0258-7998.2017.06.013

Author：Liu Boyuan，Xu Jun

Author Affilications：University of Electronic and Science Technology，China Physical and Electronic College，Chengdu 610054，China

Abstract：The method of miniaturizedly designing filter based on MEMS chips for x-band receiving module was proposed in this paper, constituting a down-conversion circuit which consisted of a four-way down-conversion receiving channel from X band to L band channel in combination with the filter chips, LO-power divider and power-control circuit. It had functions of amplifying, filtering and gain-controling, featured with a small size and low power consumption. By circuit analysis, modeling and simulation，the electrical specifications of the channel was decomposed to circuit units. The down-conversion circuit, acted as the mixing-power dividing chain，was the most important unit，which had two vital filters with MEMS chips structure，which is an RF switch filter and an IF filter. So it can be achieved with MEMS filter chips design. The MEMS filter chips had obvious advantages on performance and size. And the mixer channel had low power consumption and a small volume，conforming to the technical development trend and demands of miniaturization，modularization and integration，which was suitable for the promotion in practical application.

Key word：
mixing

MEMS filter chips

four-way down-conversion receiving channel

ADS

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Design and simulation of several operational circuits based on CFA

DOI：10.16157/j.issn.0258-7998.2017.06.014

Author：Feng Hao，Wang Yajie，Zhao Baishu

Author Affilications：School of Computer Science and Information Engineering，Hubei University，Wuhan 430062，China

Abstract：A typical current feedback operational amplifier OPA603 has been chosen to research,and several operational circuits have be designed with it. This paper discusses the circuit design principle,the circuit structure and the method of selecting component parameters in detail. Though the external zero adjustment method to solve the problem of current feedback operational amplifier imbalanc，using the Howland current source to design noninverting integrator,or adding the compensation resistance to inverting integrator which avoids the limit that inverting integrator cannot be formed by the direct capacitive feedback. The simulation results show that the method of circuit design is feasible， and the bandwidth of operational circuits composed of CFA reach 100 MHz.

Key word：
current model circuit

CFA

operational circuit

integrator circuit

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Design of high-speed serial data transceiver interface based on FPGA

DOI：10.16157/j.issn.0258-7998.2017.06.012

Author：Liu An1，2，Yu Weidong1，Ma Xiaobing1，Lv Zhipeng1，2

Author Affilications：1.Institute of Electronics，Chinese Academy of Sciences，Beijing 100190，China； 2.School of Electronic and Communication Engineering，University of Chinese Academy of Sciences，Beijing 100039，China

Abstract：To solve the problems of synchronization and inter-symbol interference caused by parallel transmission, this paper studies the high-speed serial protocol-JESD204B and provides a design of data transceiver interface based on the V7 series FPGA of Xilinx. The experiment is conducted under the bit rate of 6 Gb/s per lane, the test result verifies that this design could fulfill the requirements of synchronization and accuracy during data transmission，and also shows that serial transmission simplifies the layout of PCB, decreases the number of layers and the cost of project, which has more advantages than parallel mode.

Key word：
high-speed serial protocol

JESD204B

interface of data transmission

FPGA

ADC/DAC

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Embedded Technology

An Arduino module-based development method using MATLAB/Simulink

DOI：10.16157/j.issn.0258-7998.2017.06.015

Author：Wu Jiao，Hao Yukai，Xu Ning，Li Xiangdong

Author Affilications：AVIC Xi′an Aeronautic Computing Technique Research Institue，Xi′an 710115，China

Abstract：Based on the Arduino platform, an open source, low-cost hardware and software platform which is widely used in the measurement and control fields, the software development methods and workflows based on model are investigated in use of MATLAB/Simulink. Meanwhile, the examples of Arduino model development are analyzed, finally it completes the model design, model testing, automated code generation, automatically download and run, online debugging and so on, explores the full Arduino modeling method development, verifies Arduino model development feasibility and convenience using MATLAB/Simulink.

Key word：
module-based software development

DO-178B/C

MATLAB/Simulink

Arduino

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The design and realization of GPS baseband generation and control module based on FPGA

DOI：10.16157/j.issn.0258-7998.2017.06.016

Author：Zuo Xiaopu1，Yang Zufang2，Pan Wei3，Zheng Jiansheng1，3

Author Affilications：1.School of Electronic Information，Wuhan University，Wuhan 430072，China； 2.Information Engineering College，Wuhan Technology and Business University，Wuhan 430065，China； 3.School of Satellite Navigation and Positioning Technology Research Center，Wuhan University，Wuhan 430079，China

Abstract：Global Positioning System(GPS) baseband can be used to test the performance of navigation and positioning equipment research and generate deception jamming signal.The design and realization of GPS baseband generation and control module based on field programmable gate array(FPGA) are presented, which includes hardware circuit design and code writing. It realizes multi-channel controllable gain GPS signal output at the same time, generates C/A code and P code by using FPGA, and generates carriers L1,L2 by using direct digital frequency synthesizer(DDS). It shows that the design has the adjustable output gain and the controllable output frequency, and can provide multi-channel the baseband signals and control signals for RF module.

Key word：
FPGA

GPS

baseband

DDS

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The realize of border router in 6LoWPAN based on OpenWrt

DOI：10.16157/j.issn.0258-7998.2017.06.017

Author：Ji Fusheng1，2，Wang Yachen1，2，Hua Lei1，2

Author Affilications：1.School of Telecommunication and Information，Chongqing University of Posts and Telecommunications，Chongqing 400065，China； 2.Optical Communication and Network Key Laboratory of Chongqing，Chongqing 400065，China

Abstract：OpenWrt is a highly modular and automatic embedded Linux system. It includes effective network components for network forming and extensibility. Based on OpenWrt, a design scheme of the 6LoWPAN border router is presented. In order to gain access to both IPv6 and 6LoWPAN, two kinds of protocol are designed respectively on the border router. Through the establishment of a SLIP channel between two protocol stacks，communication between the heterogeneous networks is realized. Owing to the powerful routing function and strong packet management mechanism of OpenWrt system, this border router has direct access to IPv6 network and its scalability is good.

Key word：
OpenWrt

6LoWPAN border router

6LoWPAN

IPv6

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Design and implementation on the system of high speed fog removal in traffic video images based on FPGA

DOI：10.16157/j.issn.0258-7998.2017.06.018

Author：Gao Quanming1，Sun Junxi2，Liu Guangwen1，Cai Hua1，Chen Guangqiu1

Author Affilications：1.School of Electronic Information Engineering，Changchun University of Science and Technology，Changchun 130022，China； 2.School of Computer Science and Information Technology，Northeast Normal University，Changchun 130117，China

Abstract：To solve the problem of unclearness of traffic surveillance video image in foggy days, the paper puts forward a fog removal system in traffic surveillance video image based on FPGA. Firstly, cacheing the collected real-time image data to SDRAM, then estimating the spreading images by using the luminance component, finally recovering the original explicit images based on the atmospheric scattering model. With the characteristics of powerful process ability and richful logic resource of FPGA, the processing speed of image is 60 frames per second for a 640×480 PAL corlor image. The result shows that the system can better remove the fog in video image on the premise of outputing a high qualified vedio image.

Key word：
FPGA

traffic videos

high speed fog removal

hardware system

atmosphere scattering model

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Measurement Control Technology and Instruments

Development on a non-contact road surface temperature measurement system

DOI：10.16157/j.issn.0258-7998.2017.06.019

Author：Xie Le1，2，3，Liu Jianguo1，2，3，Cheng Yin1，3，Gui Huaqiao1，3，Lu Yihuai1，3

Author Affilications：1.Key Laboratory of Environment Optics and Technology，Anhui Institute of Optics and Fine Mechanics， Chinese Academy of Sciences，Hefei 230031，China； 2.University of Science and Technology of China，Hefei 230026，China； 3.Anhui Province Key Laboratory of Optics for Environmental Monitoring Technology，Hefei 230031，China

Abstract：Road surface temperature is not only one of meteorological elements of road surface, but also an important basis for judging the road surface condition. A non-contact infrared temperature measurement system to measure the road surface temperature uses pyroelectric detector receive road surface infrared radiation with total radiation temperature measuring method, completing the overall system design and data analysis，and calibrating the temperature with minimum double multiplication and BP neural network. The experimental results show that the three-layer BP neural network calibration has better fitting effect and the error is less than 1%. And through the experiment, compared to PT100 the correlation coefficient is 0.999. It can measure the road surface temperature accurately.

Key word：
road surface temperature

pyroelectric detector

infrared thermometer

BP network

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Design of energy saving control system for teaching building

DOI：10.16157/j.issn.0258-7998.2017.06.020

Author：Yu Xinye，Yi Yi，Hao Jianwei

Author Affilications：Institute of Information Technology，Guilin University of Electronic Technology，Guilin 541004，China

Abstract：Normally, the classrooms and power consumption equipments in the teaching building are not managed scientifically, which caused serious waste of energy resources. Aiming at this problem, a remote electrical energy conservation control system is designed. It is able to control and manage electrical equipments both on the mobile phones or PC. It can also automaticly control the electricity equipments being on or off according to the power arrangement. This system has been applied for an university, and the operation results show that it has many advantages, such as simple structure, easy installation and reliable performance. In addition, it is convenient and practical, achieving energy conservation, human resources and material resources conservation.

Key word：
electrical energy conservation control

STM32

STM8

automatic control and management

single live line power supply technology

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A novel harmonic estimation algorithm based on adaptive linear neural network

DOI：10.16157/j.issn.0258-7998.2017.06.021

Author：Fang Shu1，Han Yang2，Luo Fei3，Xu Lin4

Author Affilications：1.State Grid Sichuan Electric Power Company，Chengdu 610041，China； 2.University of Electronic Science and Technology of China，Chengdu 611731，China； 3.State Grid LiangShan Electric Power Supply Company，Xichang 615050，China； 4.State Grid Sichuan Electric Power Research Institute，Chengdu 610072，China

Abstract：To overcome the shortcomings of the conventional FFT-based harmonic estimation algorithms due to extensive computational load, poor real-time capabilities and poor noise immunities, a novel harmonic estimation algorithm based on adaptive linear neural network(ADALINE) is proposed. The mathematical model of the algorithm is presented using the least mean square(LMS) algorithm, and the step-size selection of the algorithm is discussed using three-dimensional manifold based on the LMS error and the Fourier series coefficients. The fundamental active, reactive component and the individual harmonic component are extracted from the load current using time-domain iterations, which lays the basis for the selective harmonic compensation purposes.

Key word：
Harmonic detection

least mean square algorithm

ADALINE

step-size

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Research on test method of new generation of aviation bus system

DOI：10.16157/j.issn.0258-7998.2017.06.022

Author：Wang Zhongjie1，Suo Gaohua2，Chen Wei2，Zhang Yaqi2，Wang Xuanming3，4

Author Affilications：1.Chinese Flight Test Establishment，Yanliang 710089，China； 2.Xi′an Xiangteng Microelectronics Technology CO.，LTD，Xi′an 710068，China； 3.AVIC Computing Technique Research Institute，Xi′an 710068，China； 4.Aviation Key Laboratory of Science and Technology on Integrated Circuit and Micro-System Design，Xi′an 710068，China

Abstract：In order to ensure the correctness of the new generation of aviation bus——Military 1394 bus′s performance andfunction,and it′s protocol conformance and reliability of system application,thesyster test of bus becomes a necessary means. In this paper,it sets up a test platorm for bus system,and researches test methods of this bus system from bus electricalcharacteristics,bus protocol conformance,system application. Through the joint-test, experiments and flight tests of the bus system,it is proved that the system test method described in this paper is effective and feasible,which provides a reliable guarantee for the flight safety of the new generation of aviation system.

Key word：
bus system

1394 bus

electrical characteristics

protocol conforms

reliability

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Design of embedded spectral density measurement system based on LabVIEW

DOI：10.16157/j.issn.0258-7998.2017.06.023

Author：Zhao Shuofeng1，Zhang Juan2

Author Affilications：1.Wenzhou Medical University Renji College of China，Wenzhou 325035，China； 2.School of Biomedical Engineering，Wenzhou Medical University of China，Wenzhou 325035，China

Abstract：To facilitate the requirements of actual project, an inexpensive and integratable measuring system spectral intensity is designed. It adopts linear array CCD device TSL1401 as optoelectronic conversion device, and sets FPGA chip EP1C3T100C8 as the control core for collection system, while ARM chip STM32F103RCT6 is used as the data transmission channel for realizing to communicate with upper computer. And the real-time display of collection data will be completed through the module of LabVIEW. The experimental result shows that the system can distinguish the different fringe objects obviously, which meets the expectation of theory. This system is stably and efficiently to be applied for real-time and fast spectral measurement with accuracy.

Key word：
spectrum density

embedded

LabVIEW

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Communication and Network

PAPR reduction in wavelet-based OFDM using improved PTS-μ law algorithm

DOI：10.16157/j.issn.0258-7998.2017.06.024

Author：Wu Hong1，2，Xu Xiyan1，2，Ma Xiaoxu1，2，Tang Ran1，2，Liu Bing1，2

Author Affilications：1.College of Electronic Information and Optical Engineering，Nankai University，Tianjin 300350，China； 2.Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology，Nankai University，Tianjin 300350，China

Abstract：Wavelet-based orthogonal frequency division multiplexing(WOFDM) system has the problem of high peak-to-average ratio(PAPR). Aiming at the high computational complexity and low bit error(BER) performance of the traditional technique to reduce PAPR, a PAPR reduction algorithm using improved partial transmit sequence(PTS) technology and μ-law companding method is proposed in the paper. Simulation results show that the improved PTS technology greatly reduces the computational complexity with only a little PAPR performance lost compared to the traditional technology. Combining improved PTS technology with μ-law companding method, in the premise of low computational complexity, the PAPR value in WOFDM system reduces by 4.7 dB with only 1.4 dB BER lost.

Key word：
wavelet transform

OFDM

PAPR

μ-law companding

PTS

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Improved joint signal reconstruction algorithm for wideband collaborative spectrum sensing

DOI：10.16157/j.issn.0258-7998.2017.06.025

Author：Tong Minglei1，2，Bai Yong1，2

Author Affilications：1.State Key Lab of Marine Resource Utilization in South China Sea，Hainan University，Haikou 570228，China； 2.College of Information Science and Technology，Hainan University，Haikou 570228，China

Abstract：Sub-Nyquist sampling with Modulated Wideband Converter(MWC) can reduce required sampling rate for wideband spectrum sensing of Cognitive Radio(CR), and collaborative spectrum sensing conducted by multiple CRs and a fusion center can help increasing the precision of spectrum sensing. The Block Sparse Simultaneous Orthogonal Matching Pursuit(BSOMP) algorithm, extended from Orthogonal Matching Pursuit(OMP), has been investigated as one joint signal reconstruction algorithm for collaborative spectrum sensing with MWC, but the percentage of correct support recovery of BSOMP algorithm is not satisfied in low Signal Noise Ratio(SNR) regime. In this paper, Block Sparse Simultaneous Compressive Sampling Matching Pursuit(BSCoSaMP) algorithm, extended from Compressive Sampling Matching Pursuit(CoSaMP), is proposed to be the improved joint signal reconstruction algorithm for collaborative spectrum sensing. Simulation results demonstrate that higher percentage of correct support recovery can be achieved with BSCoSaMP algorithm than with BSOMP algorithm.

Key word：
Cognitive Radio(CR)

spectrum sensing

sub-Nyquist sampling

Orthogonal Matching Pursuit(OMP)

Compressive Sampling Matching Pursuit(CoSaMP)

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Mobile communication vehicle dynamic networking anti-jamming effectiveness evaluation simulation

DOI：10.16157/j.issn.0258-7998.2017.06.026

Author：Wang Shujuan1，Li Weiping2

Author Affilications：1.Department of Information Technology，Zhongyuan College of Information & Business，Zhengzhou 451191，China； 2.Department of Police Technology，Railway Police College，Zhengzhou 450053，China

Abstract：In view of the traditional evaluation method of non mobile communication vehicle dynamic network anti jamming effectiveness evaluation is not accurate，the evaluation of anti jamming effectiveness of mobile vehicle dynamic network combined maximum deviation method and support vector machine is proposed. Based on the analysis of mobile communication vehicle dynamic network structure and evaluation index, for the mobile communication vehicle，its dynamic network information is preprocessed, increasing the accuracy of the information. Based on the maximum deviation method and the support vector machine method, the vehicle dynamic anti jamming effectiveness evaluation model is established, realizing anti jamming effectiveness evaluation. Experimental results show that，with the improved evaluation method, the evaluation of the error is small, anti-jamming effectiveness evaluation is good, it has certain advantages.

Key word：
mobile communication vehicles

dynamic network

anti-interference performance

evaluation model

simulation analysis

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Performance analysis of physical layer security based on the average rate over Rayleigh fading channels

DOI：10.16157/j.issn.0258-7998.2017.06.027

Author：Yuan Liangfeng1，Lin Shengbin2

Author Affilications：1.Guangxi College of Water Resources and Electric Power，Nanning 530023，China； 2.Chongqing Communication Institute，Chongqing 400000，China

Abstract：According to the existing physical layer security technology lack of security performance analysis over Rayleigh fading channel, this paper establishes the wiretap model over the Rayleigh fading channel. Firstly, the average decoding rate and the average eavesdropping rate are used to measure the effectiveness and safety of the transmission system and their analytical expressions are derived. Then, the compromise of the safety and effectiveness is modeled as a multi-objective optimization problem, which is further transformed into a single objective optimization problem by using the linear weighted method. Besides, an optimal transmission rate algorithm is given based on gradient descent method. Finally, the simulation results show the effects of the signal transmission rate, the eavesdropping position, the number of loop iterations and other factors on the security performance.

Key word：
physical layer security

average decoding rate

average eavesdropping rate

gradient descend method

View(9262)

Dynamic multimedia transmission scheme based on GOP frames cooperation

DOI：10.16157/j.issn.0258-7998.2017.06.028

Author：Jin Yong，Qian Zhenjiang

Author Affilications：School of Computer Science and Technology，Changshu Institute of Technology，Changshu 215500，China

Abstract：According to the reliability of mobile multimedia communication and the real-time security of parallel multi stream, a multi stream parallel dynamic transmission mechanism based on GOP is proposed. Firstly, based on the multimedia stream structure and video frame priority, the construction and dynamic adjustment scheme of the GOP sub frame cooperative transmission network is proposed. Secondly, the dynamic state analysis based on the multimedia stream number, channel quality, variation of decodable frame ratio and bit error rate is given, and a dynamic multimedia transmission mechanism based on GOP Frames Cooperation is proposed. Finally, the simulation results show that the proposed scheme has good performance in real-time, parallel efficiency and reliability, and is very suitable for parallel large-scale multimedia real-time communication.

Key word：
group of pictures frames

cooperative transmission

multimedia stream

dynamical scheduling

multiple stream parallel

View(7268)

High mobility channel estimation method based on basis expansion model

DOI：10.16157/j.issn.0258-7998.2017.06.029

Author：Huang Jinjin，Zhao Yisheng，Chen Zhonghui，Lai Xinlin，Dong Zhixiang

Author Affilications：College of Physics and Information Engineering，Fuzhou University，Fuzhou 350108，China

Abstract：In this paper, the problem of high mobility channel estimation is investigated in the Long-Term Evolution for Railway(LTE-R) communication system. By employing a Basis Expansion Model(BEM), the channel impulse response of the LTE-R system is fitted as the summation of several basis functions multiplied by the corresponding coefficients. The fast time-varying channel can be obtained approximately by estimating the coefficients of the basis functions. The performances of a polynomial BEM, a Complex Exponential BEM(CE-BEM), a Generalized CE-BEM(GCE-BEM), and an Optimization GCE-BEM(OGCE-BEM) are compared by simulation. Simulation results show that the OGCE-BEM has the lowest Normalized Mean Square Error(NMSE). In addition, the estimation performances of the OGCE-BEM are discussed under different moving speeds, different numbers of basis functions, and different modulation modes, respectively. Simulation results reveal that the OGCE-BEM still has a lower NMSE under a higher moving speed, a smaller number of basis functions, and a higher order modulation.

Key word：
channel estimation

high mobility

basis expansion model

View(9866)

Computer Technology and Its Applications

Design and implementation of a vertical search engine for web stock review

DOI：10.16157/j.issn.0258-7998.2017.06.030

Author：Wang Shuai，Huang Yongfeng，Hu Ping

Author Affilications：The Research and Application of Network Technology in the Next Generation，Department of Electronic Engineering， Tsinghua University，Beijing 100084，China

Abstract：The stock market is a barometer of the national macroeconomic environment，the views of users on the stock market to a large extent reflect the views of the stock market，but also affect the stock market. Therefore，through the emotional network text polarity analysis technology and search engine technology to mining stock network view is one of the hot topic of current financial information and cross discipline.This paper designed a fusion vertical search full-text search and opinion mining for network stock review engine system structure，put forward a network oriented theme stock data acquisition point harvest algorithm and crawler structure，and established a multi granularity unsupervised emotion network stock review fuzzy calculation polarity classification method,to achieve the analysis of online stock comment.The test results show that the classification accuracy, the efficiency of data acquisition and the response time of search engine can meet the requirements of practical application.

Key word：
stock network

affective computing

search engines

topical crawler

View(6448)

Rapid detection system for aircraft fuselage based on UAV

DOI：10.16157/j.issn.0258-7998.2017.06.031

Author：Wei Yongchao，Zhao Wei

Author Affilications：1.Academy of Flight Technology and Safety，Civil Aviation Flight University of China，Guanghan 618307，China； 2.Aviation Engineering Institute，Civil Aviation Flight University of China，Guanghan 618307，China

Abstract：In order to solve the problem of rapid detection of aircraft fuselage and improve efficiency and accuracy of detection, a rapid detection system for airplane fuselage structure was designed, which used the detection device and multiple rotor unmanned aerial vehicle(UAV). Multi-level and modular open structure design was adopted for the system’s hardware, and a set of general software testing platform was constructed. The whole system was divided into the mobile airborne control platform and the back-end processing platform, which could realize feedback of images and real-time monitoring for detection process. Through the analysis of collected data, the final diagnosis results and the test report could be obtained. Finally, the system was used to detect the real aircraft, and the effectiveness of the system was verified by the results.

Key word：
unmanned aerial vehicle

aircraft fuselage

3D scanning

data processing

View(14376)

An improved algorithm of association rules based on the Spark

DOI：10.16157/j.issn.0258-7998.2017.06.032

Author：Ye Lu，Dong Zengshou

Author Affilications：School of Electronic Information Engineering，Taiyuan of Science and Technology，Taiyuan 030024，China

Abstract：Association rules Apriori algorithm have problems with large calculation cycle and low algorithm efficiency faced with huge amounts of data in the era of information explosion, data in a specific storage on the data structure to reduce the data on the number of times past, pruning operation before the items self-joins and changing the terms of judgment have been adopted in the paper, and the algorithm combined with Spark computing framework, an improved algorithm based on the Spark(Spark+IApriori) can be put forward. Experimental results show that the Spark+IApriori algorithm has a good data scalability and speed ratio than Apriori.

Key word：
association rules

Apriori

MapReduce

Hadoop

Spark

View(14646)

A fast pedestrian detection method combining contour rough selection and HOG fine classification

DOI：10.16157/j.issn.0258-7998.2017.06.033

Author：Zhang Li1，Wei Yanming2，Zhou Bin3

Author Affilications：1.Department of Computer and Information Technology，Zhejiang Changzheng Vocational & Technical College， Hangzhou 310012，China； 2.Department of Information Management，Henan Institute of Economics and Trade，Zhengzhou 450018，China； 3.College of Information Engineering，Zhengzhou University，Zhengzhou 450001，China

Abstract：For solving the problems of high false alarm rate and low efficiency of existing pedestrian detection methods, a fast pedestrian detection method is proposed. First, this paper executes contour rough selection of the first layer according to geometric features of the contours, and executes the one of the second layer according to the invariant moments of the contours, to remove false-targets and reduce false alarm rate. On this basis, this paper crops the suspicious image patches and only extracts histogram of oriented gradients(HOG) features on these image patches, and then uses linear support vector machines to classify these features, for further reducing the false alarm rate. Meanwhile, the efficiency is improved because the number of HOG feature extraction is sharply reduced. Simulations train and verify features on INRIA and Caltech dataset, respectively. Results show that the new method has low false alarm rate and high efficiency.

Key word：
pedestrian detection

contour extraction

invariant moments

HOG

SVM

View(9140)

Designing and implementing a fast 3D reconstruction system for UAV sequence images

DOI：10.16157/j.issn.0258-7998.2017.06.034

Author：Xie Lixiang，Wan Gang，Cao Xuefeng，Wang Qinghe

Author Affilications：School of Geospatial Information，Information Engineering University，Zhengzhou 450001，China

Abstract：A fast 3D reconstruction system called FDroneMap for sequence image of unmanned aerial vehicle(UAV) is designed and implemented. The efficiency of the system is improved through two aspects. One is optimizing reconstruction algorithm, using a new image matching method based on hash table and adjust image matching strategy according to the "sequential characteristic in time and space" of UAV to accelerate the speed of image matching. On the other hand, each module of the reconstruction algorithm is designed in parallel, which improves the performance of the system. The contrast experiments show that FDroneMap can significantly improve the efficiency of 3D reconstruction in the process of high resolution UAV images, and can guarantee the accuracy of the reconstruction.

Key word：
unmanned aerial vehicle

matching based on hash table

sequential characteristic in time and space

parallel

View(12630)

An accurate positioning method for vehicles with multi-sensor fusion and neighbors collaboration

DOI：10.16157/j.issn.0258-7998.2017.06.035

Author：Huang Jinguo1，Zhou Xianchun2

Author Affilications：1.School of Information and Electrical Engineering，Jiangsu Open University，Nanjing 210017，China； 2.School of Electronics and Information Engineering，Nanjing University of Information Science and Technology，Nanjing 210044，China

Abstract：Facing to the low positioning accuracy problem of existing vehicle positioning devices, an accurate positioning method for vehicle ad-hoc networks is proposed. First, it obtains multi-sensor information from vehicles, and fuses these information to build the state model of the current vehicle. Then, Bayesian filtering method is used to calculate the credibility for vehicle′s current state. And then, it estimates the relative position of current vehicle by combining with the vehicles′ information of current vehicle′s one hop neighbors. Finally, it amendments the current location of the vehicle to improve the positioning accuracy with the information above. Experiments show that, compared with commonly used methods such as global positioning system(GPS) and extended Kalman filter, the new method has higher positioning accuracy and less influenced by GPS positioning error.

Key word：
vehicle positioning

multi-sensor fusion

neighbors collaboration

Bayesian filtering

credibility

View(9734)

Power Supply Technology and Its Application

Research on a novel carrier-based hybrid SPWM strategy control modular multilevel converter

DOI：10.16157/j.issn.0258-7998.2017.06.036

Author：Yuan Zhiwen，Dong Xiucheng，Yu Xiaomei

Author Affilications：Key Laboratory of Power Electronic Energy-saving Technology & Equipment(Xihua University)，Chengdu 610039，China

Abstract：Modular multilevel converter(MMC) is one of the hot spots in the application of Voltage Source Converter based High Voltage Direct Current Transmission(VSC-HVDC). Aiming at the traditional pulse width modulation method in the MMC system, which vary the output power of each module unit and the performance of the output waveform is reduced, a carrier-based hybrid SPWM(CBH-SPWM)is proposed. The modulation strategy includes characteristics of the carrier overlapping modulation and carrier phase shift modulation .On the one hand, the performance of output voltage is improved, on the other hand, output power of each module in the MMC is equal. The correctness and effectiveness of proposed CBH – SPWM was verified through the simulation calculation.

Key word：
modular multilevel converter(MMC)

output power of modular

output performance

carrier-based hybrid SPWM(CBH-SPWM)

View(9354)

Design of non isolated CC/CV mode switching PI control fuel cell booster charger

DOI：10.16157/j.issn.0258-7998.2017.06.037

Author：Yao Jin

Author Affilications：College of Mechanical and Material Engineering，Wuzhou University，Wuzhou 543000，China

Abstract：In order to realize the charging of lithium polymer battery and reduce the charge ripple, a non isolated constant current/constant voltage mode switching PI control fuel cell booster charger design method is proposed. The fuel cell needs to balance equipment problems start power, as the standby rechargeable battery lithium polymer battery, and the charging process in the traditional boost charger ripple amplitude is large, is not conducive to battery life, through the analysis of steady state characteristics and boost charger transfer function is derived, and the design of the external PI controller for commercial integrated circuit based on MAX745 to achieve constant current and constant voltage automatic switching technology charging mode, obtain good ripple rejection and stable charging effect. The experimental results show that the proposed algorithm has high stability margin, which can obtain faster charging speed and lower battery loss, that verifies the effectiveness of designed charging circuit.

Key word：
non isolated type

PI control

mode switching

boost charger

fuel cell

View(9970)

Design of distributed generation micro-grid control system

DOI：10.16157/j.issn.0258-7998.2017.06.038

Author：Xie Meng，Zhao Luhuai，Wang Juan

Author Affilications：City College，Xi′an Jiao Tong University，Xi′an 710018，China

Abstract：In order to save energy and protect the environment, efforts have been made to develop and use of sustainable energy sources. Photovoltaic, wind and fuel cell power generation will be the main future distributed power generation. This article is designed for distributed generation micro network control system, the power of distributed maximum power emitted by the microcontroller, H-bridge circuit, driver circuit, sampling circuit dual-loop control, energy storage devices, load or distributed power source output when the change, using two closed-loop system to stabilize the DC bus voltage, the system is such that the maximum power tracking module energy can be transported to the grid, two-way flow of energy. After testing, the control system can complete photovoltaic cell maximum power output control, and so the range of voltage stability is very small, and achieves high accuracy regulation.

Key word：
distributed generation

photovoltaic cells

maximum power tracing

H bridge circuit

View(11290)

Simulation and analysis of 1 800 MHz RF energy harvesting system

DOI：10.16157/j.issn.0258-7998.2017.06.039

Author：Tie Huanhuan，Liu Gaoping

Author Affilications：EDA Key Laboratory，Zhejiang Wanli University，Ningbo 315100，China

Abstract：The output voltage and power conversion efficiency(PCE) of radio frequency(RF) energy harvesting system are two important parameters to measure the system performance. In this paper, the circuit is operating in the 1 800 MHz band, mainly consists of receiving antenna, impedance matching circuit, six stage rectification voltage-multiplying circuit and load circuit. In Advanced Design System（ADS）simulation, signal source power change between -30 dBm~0 dBm, the change of the load resistance value between 100 kΩ~500 kΩ, observe the whole circuit changes of the output voltage and PCE. Results show, increasing both the incident power and the load resistance can increase the output voltage of the circuit, PCE will increase with the enhancement of incident power increase but decrease with the increase of load resistance, the output voltage and power of system that collecting RF signal with high power can meet the requirement of low power equipment.

2017 No. 06

Publish Date：2017-06-06

ISSN：0258-7998

CN：11-2305/TN

Special Column-Aerospace Electronic Technology

Key word： solar irradiance spectrometer spectral calibration mercury-lamp source single-ended flyback current control View(11796)

Key word： CMOS camera FPGA disk array Gigabit Ethernet View(11318)

Key word： high-speed large-capacity space-borne storage multi-payload pipeline operation file-based bad block management View(10430)

Key word： BD navigation satellite-based Augmentation System(BDSBAS) grid ionospheric model grid vertical delay GIVE View(23614)

Key word： radar signals fusion and recognition evidence theory classification strategy consistency of ranking method View(13464)

Key word： satellite constellation design worst case observation point street of coverage analytic hierarchy process coverage performances View(17224)

Review and Comment

Key word： integrated circuit portable wearable implantable artificial organs View(17598)

Key word： orbital angular momentum antenna wireless communication View(28636)

Microelectronic Technology

Key word： FPGA polarization code channel polarization SC decoding View(23334)

Key word： constant current output temperature self adaptive hysteresis thermal shutdown LED driver over temperature protection View(10730)

Key word： digital video JPEG multicore DSP TMS320C6678 real-time View(10540)

Key word： mixing MEMS filter chips four-way down-conversion receiving channel ADS View(9710)

Key word： current model circuit CFA operational circuit integrator circuit View(10416)

Key word： high-speed serial protocol JESD204B interface of data transmission FPGA ADC/DAC View(27076)

Embedded Technology

Key word： module-based software development DO-178B/C MATLAB/Simulink Arduino View(22656)

Key word： FPGA GPS baseband DDS View(18614)

Key word： OpenWrt 6LoWPAN border router 6LoWPAN IPv6 View(14298)

Key word： FPGA traffic videos high speed fog removal hardware system atmosphere scattering model View(17580)

Measurement Control Technology and Instruments

Key word： road surface temperature pyroelectric detector infrared thermometer BP network View(8172)

Key word： electrical energy conservation control STM32 STM8 automatic control and management single live line power supply technology View(11770)

Key word： Harmonic detection least mean square algorithm ADALINE step-size View(7714)

Key word： bus system 1394 bus electrical characteristics protocol conforms reliability View(16718)

Key word： spectrum density embedded LabVIEW View(8606)