Home > Archive > 2016 No. 06

2016 No. 06

Publish Date：2016-06-06
ISSN：0258-7998
CN：11-2305/TN
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Special Column-IEEE-1394 Bus

1394 bus technology summary

DOI：10.16157/j.issn.0258-7998.2016.06.001

Author：Tian Ze1，2，Suo Gaohua3，Liu Yufeng4，Li Kai3

Author Affilications：1.AVIC Computing Technique Research Institute，Xi′an 710068，China； 2.Aviation Key Laboratory of Science and Technology on Integrated Circuit and Micro-System Design，Xi′an 710068，China； 3.Xi′an Xiangteng Microelectronics Technology CO.，LTD，Xi′an 710068，China； 4.Beijing Keeven Aviation Instrument CO.，LTD，Beijing 100086，China

Abstract：The features 1394 has, like static assignment of channel numbers,synchronization via start of frame packets,use of asynchronous streams and pre-assignment of bandwidth，are able to meet the requirements of avionics system, which make Mil-1394 the priority of safety-critical/mission-critical applications for military and aerospace vehicles. Based on the knowledge of the developing background of 1394, the essay analyzes Mil-1394′s essential technology in detail and introduces its growing trend, which lays a solid ground for the further construction of the system and application of the project.
Key word：
Mil-1394
essential technology
growing trend
View(46914)

Analysis and research of 1394 bus key protocol

DOI：10.16157/j.issn.0258-7998.2016.06.002

Author：Yang Feng1，2，Chen Wei3，Wang Xuanming1，2，Yang Qingke3

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

Abstract：In a new generation of aircraft safety-critical and mission-critical systems,real-time,certainty and reliability of bus are put forward higher requirements. To ensure the high real-time,high certainty of a bus transmission and high reliability, 1394 bus protocol specification forced constraints such as the root node,the static assignment channel number,vertical parity check,STOF synchronous and asynchronous flow packet communication and send/receive electric property indexes. Aiming at application demand of 1394 bus in the safety-critical and mission-critical system, detailed analysis and research on the 1394 bus key protocol are given respectively from the bus topology，bus packet format and the reliability. Then it established theoretical foundation for design,implementation and system application of 1394 bus.
Key word：
IEEE 1394b protocol
1394 bus
asynchronous flow packet
remode node
redundancy topology
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Design and implementation of aerocraft management 1394 bus interface module

DOI：10.16157/j.issn.0258-7998.2016.06.003

Author：Cai Yefang1，2，Zhang Yaqi3，Niu Shaoping1，2，Xia Jie3

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

Abstract：In the 1394 bus application for a new generation of aerocraft management system,in order to satisfy the standard node design,improve the electrical characteristics signal quality,and reduce the node′s maintenance costs，this paper puts forward a aerocraft management 1394 bus interface module based on 1394 bus protocol. The module has characteristics of low power,small volume,light weight and high reliability,and 1394 bus three ports are fetched respectively by three 1394 special cable with plait format,to achieve the standardization and unification of interface. In the full understanding of 1394 bus protocol，the article introduces the aerocraft management 1394 bus interface module design and implementation from the hardware architecture,logic design and software design repectively. The test and verification show that the interface module function and performance meet the demands of the application of avionic.
Key word：
1394 bus protocol
aircraft management system
AS5643 protocol
interface module
View(15034)

Design and implementation of avionics 1394 node

DOI：10.16157/j.issn.0258-7998.2016.06.004

Author：Zhao Bin1，2，Yi Ningning3，Zheng Fei1，2，Wei Yanyan1，2

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

Abstract：Airborne bus node interface module as system bus network access nodes,its performance of completeness and reliability has the vital function for bus network system construction. 1394 bus as a new generation of aircraft avionics bus network transmission,the importance of the node module design is obvious. The paper combines protocol with demand of bus system background,and designs a kind of avionics bus 1394 node interface module.This node module is based on standardization and generalization design, extracts the user demand,and is combined with 1394 protocol hierarchy to make the final product architecture. Founction in the design of bus nodes using CC\RN\BM integration design,providing PCI\PCIE host interface,supporting S100\S200\S400 configurable bus communication speed,and flexible design to provide users with software and hardware interface standard,which effectively reduce the design and maintenance costs.
Key word：
Mil1394
AS5643
Mil-1394 node
View(17312)

Design and implementation of 1394 three-node simulation card

DOI：10.16157/j.issn.0258-7998.2016.06.005

Author：Xin Yongli1，2，Jin Weiping3，Jia Zhao3，Chen Feiru3

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

Abstract：It has high cost and risk to make a military 1394 bus verifation test which is based on a airborne environment，as well as great limitations.It is deeply necessary to develop a corresponding ground simulation device for bus system of integrated simulation test.This paper combines the demand of 1394 protocol in the military field developed a military 1394 three-node simulation card.This device achieves integration design of the control computer,remote node,the bus monitoring and load maintenance,which makes data transceiver,configuration load,fault injection,communication monitoring,topology display,remote loading,and other functions into one. It can be used in the laboratory environment to build a complete military 1394 bus communication system,and build the airborne subsystem device between the complicated situation of the internet. The completion of a comprehensive system bus simulation application test provides support and guarantee in the field of military.
Key word：
Mil1394
simulation device
three-node
View(13728)

Design and implementation of 1394 simulation system

DOI：10.16157/j.issn.0258-7998.2016.06.006

Author：Zhang Ling1，2，Tian Ruilong3，Yang Chengli3，Wang Huan3

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

Abstract：As 1394 bus is widely used in the field on airborne,for low cost and flexibility consider,the process of surface configuration,simulation,testing,monitoring and test need to establish a complete set of 1394 bus simulation test system. Reliable bus simulation system can realize the product level and system level application testing,at the same time，shorten the system development cycle and save the development costs greatly. This paper proposes a 1394 bus simulation system design scheme，combinging with the system requirements with the detailed introduction of the system building,system configuration,system monitoring and simulation and system configuration,to establish a comprehensive,complete,reliable platform for the simulation system. Based on the platform，the further study of 1394 bus communication mechanism,operation mode,the working principle and system application can be achieved. It is easy for system developer to detect a failure,check and maintenance,and provides reliable technical support for the development，validation,test and application of airborne equipment.
Key word：
1394 bus
AS5643
simulation system
View(12106)

Review and Comment

Research on HF wide area diversity technology

DOI：10.16157/j.issn.0258-7998.2016.06.007

Author：Liu Qinglong1，2，Dong Jiashan2

Author Affilications：1.School of Electronic and Information Engineering，South China University of Technology，Guangzhou 510640，China； 2.Guangzhou Haige Communications Group Incorporated Company，Guangzhou 510663，China

Abstract：Through multiple High Frequency(HF) fixed stations that are connected by wireline networks and far away from each other, HF wide area diversity technology collects HF signals from different areas and polarization diversity antennas, combines these signals real time and retrieves the original signals so as to improve the stability and reliability of HF voice communications. For the design of HF wide area diversity systems, firstly the technical feature is introduced in details and the difficulties are also pointed out. This paper summarized the current research at home and abroad on HF wide area diversity technology. Finally, the paper introduced the key technologies of HF wide area diversity and gave the prospect of future developments.
Key word：
HF communication
wide area diversity
View(12344)

Microelectronic Technology

A wideband programmable gain amplifier with high linearity

DOI：10.16157/j.issn.0258-7998.2016.06.008

Author：Ke Qiang1，2，Liu Xin1，2，Liu Yu1，2，Wang Xiaosong1，2，Zhang Haiying1，2

Author Affilications：1.Institute of Microelectronics of Chinese Academy of Sciences，Beijing 100029，China； 2.Beijing Key Laboratory of Radio Frequency IC Technology for Next Generation Communications，Beijing 100029，China

Abstract：A wideband programmable gain amplifier(PGA) with high linearity is designed for ultra-wideband wireless receiver. The PGA is composed of linearity enhanced amplifier with source degenerate and attenuator. Variable gain is achieved by two steps，the 6 dB gain step is implemented by the PGA Core and the 1 dB gain step is implemented by the attenuator. To improve PGA linearity, PGA Core adopts linearity enhanced amplifier with source degenerate. The PGA is implemented in SMIC 0.18 μm 1.8 V CMOS process. The simulation results show that the PGA achieves a dynamic range from -4 dB to 28 dB with 1 dB step and a 3 dB bandwidth up to 280 MHz. The output third-order intercept point(OIP3) is 25.7 dBm and the noise figure(NF) is 22.24 dB at the maximum gain. The quiescent current of PGA is 10.4 mA. The chip area is 0.2 mm2.
Key word：
programmable gain amplifier
linearity enhanced amplifier
digital control
wideband
View(12392)

Application and implementation of video scaling algorithm based on FPGA

DOI：10.16157/j.issn.0258-7998.2016.06.009

Author：Zhang Liang，Wang Jingcun，Mei Biao

Author Affilications：College of Information Science and Engineering，Wuhan University of Science and Technology，Wuhan 430081，China

Abstract：Focusing on the practical requirements of the monitoring video controller in some displaying systems, this paper introduces a circuit architecture which is designed for real time scale of four video signals. Through analyzing the display quality and hardware realizability of several scaling algorithms, selects implement video scaling by bilinear interpolation algorithm and uses line buffers architecture as the core of algorithms implementation based on FPGA. The design mainly consists of the data buffer module, the coefficient generation module and the integrated control module. To meet the quality requirements of video scaling, this design avoids selecting complex algorithms to cause FPGA resources to be consumed excessively, and effectively solves the problem of image distortion caused by the loss of the original image information. The result indicates that the system can realize arbitrary scaling, and its real-time，flexibility and display effect are good, which can meet the application requirements of the actual project.
Key word：
video scaling
bilinear interpolation
line buffer
FPGA
View(16482)

Design of navigation system intermediate frequency filter

DOI：10.16157/j.issn.0258-7998.2016.06.010

Author：Huang Haisheng，Jing Genping，Li Xin，Chen Shunzhou

Author Affilications：School of Electronic Engineering，Xi′an University of Posts and Telecommunications，Xi′an 710121，China

Abstract：In this paper，a high out-band restraint，low in-band flatness and high linearity six order Chebyshev filter is proposed to solve the problem of the Intermediate Frequency Filter(IFF) that can only receive single frequency band signal in the Radio Frequency(RF) receiver of navigation system,it can be used to Radio Frequency(RF) receiver which can receive B1 frequency band signal from BD Satellite Navigation System and L1 frequency band signal from GPS. The filter is on the basis of double pole section of gain structure,through the adoption of three class united way to implement. The circuit is simulated by the Spectre in Cadence which indicates that the center frequency is 4 MHz, the -3 dB bandwidth is 4 MHz, the active gain is 13 dB,Gain flatness ±1 dB. Attenuation is more than 20 dB when 28 MHz, The gain of the operational amplifier is greater than 45 dB, and the bandwidth of it is more than 190 MHz, the phase margin of it is greater than 60°，1 dB compression point for -14 dBm.
Key word：
IFF
gain
P1dB
phase margin
View(9986)

The error analysis of measuring methods for locking-time based on PLLFS

DOI：10.16157/j.issn.0258-7998.2016.06.011

Author：Zhao Wen1，Yin Junjian1，Zhao Dongliang1，2

Author Affilications：1.Institute of Microelectronics of Chinese Academy of Sciences，Beijing 100029，China； 2.School of Physics and Microelectronics，Hunan University，Changsha 250100，China

Abstract：With the development of frequency hopping communication, the locking-time of phase-locked loop frequency synthesizer is limited more and more strictly, even shortens to 20 μs in the TD-LTE standard. Yet there has not been uniform industry standard for related measurement, and further more, no systematic analysis and comparison have been made for different locking-time methods. Based on this situation, this paper selected five methods to measure the locking-time of a same ADF4351 PPLFS, further more, with the standard of the result of using the signal source analyzer method, we analysised and compared the deviation errors of the spectrum analyzer method, the oscilloscope direct measurement, the VCO tuning-voltage-test method and the LD pin -test method. Therefore the results showed these four methods could not meet the locking-time test requirements under one thousand microsecond, and only the signal source analyzer could do that.
Key word：
frequency synthesizer
phase-locked loop
locking-time
ADF4351
measurement
View(9266)

Design of multi-channel digital down-converter of digital radar receiver

DOI：10.16157/j.issn.0258-7998.2016.06.012

Author：Huang Shifeng1，Chen Zhangyou1，Zhang Lan1，2，Yue Xianchang1，2

Author Affilications：1.School of Electronics and Information，Wuhan University，Wuhan 430072，China； 2.Collaborative Innovation Center of Geospatial Technology，Wuhan 430079，China

Abstract：A digital down-converter(DDC) module in a multi-channel digital radar receiver executed at two frequencies is designed based on time division multiplexing(TDM) technique, this new DDC designed by using intellectual?property(IP) cores of the numerical controlled oscillator(NCO) and the finite impulse response(FIR) filter of a field programmable gate array(FPGA). Simulation of this new designed DDC shows that these functions, such as digital mixer, decimation and filter have been achieved. Furthermore, this new DDC reduces the occupation of FPGA resources, simplifies the complexity of hardware design and reduces the cost of hardware.
Key word：
digital receiver
two working bands synchronously
multi-channel
digital down-converter
time division multiplexing
View(13478)

Short-circuit strategy of IGBT module based on two levels di/dt detection

DOI：10.16157/j.issn.0258-7998.2016.06.013

Author：Wang Liangliang1，2，Yang Yuan1，Gao Yong1,2，Wen Yang1，2，Ma Li1

Author Affilications：1.Department of Electronics Engineering，Xi′an University of Technology，Xi′an 710048，China； 2.Department of Electronics & Information，Xi′an Polytechnic University，Xi′an 710048，China

Abstract：In order to solve the existing problems of the traditional VCE in detecting the short-circuit fault of high power IGBT module, on the basis of analyzing IGBT short-circuit characteristic, a strategy based on two levels di/dt for detecting IGBT two types short-circuit fault is proposed in this paper. It enables the driver to take protective measures much earlier with limiting IGBT short circuit current and short circuit power consumption, reducing spike voltage. The results of short-circuit experiment based on 3 300 V/1 200 A IGBT module prove that the strategy proposed is effective and feasible.
Key word：
IGBT
short-circuit characteristic
detection circuit
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Embedded Technology

A laser cutting head servo system based on STM32 and PCAP01

DOI：10.16157/j.issn.0258-7998.2016.06.014

Author：Wang Hai，Zhang Lichao，Zhou Weiguang

Author Affilications：College of Materials Science and Engineering，Huazhong University of Science and Technology，Wuhan 430074，China

Abstract：In order to improve the quality and reliability of laser cutting system, because of the undulating surface of workpiece, a laser cutting head servo system based on STM32 and PCAP01 was designed. It used PCAP01 to get the capacitance between the nozzle on laser cutting head and the surface of workpiece. The distance was calculated by capacitance, after Kalman filtering, which was used to keep the distance between laser cutting head and workpiece. The results show the equipment has good quality and reliability.
Key word：
STM32
PCAP01
μC/OS-III
laser cutting
View(13258)

Asynchronous LFSR encryption system based on FPGA

DOI：10.16157/j.issn.0258-7998.2016.06.015

Author：Pan Bitao，Nie Xiaolong，Wang Zuqiang

Author Affilications：School of Information Science and Engineering，Shandong University，Jinan 250100，China

Abstract：As a kind of stream cipher, linear feedback shift register(LFSR) pseudo random binary sequence(PRBS) has widely applied in many encryption occasions with characters like succinct principle and strong unpredictability, to solve the limitation that encryption system based on LFSR can only work in synchronous condition, this paper proposed a asynchronous configurable LFSR encryption system, and has implemented the system in hardware based on FPGA. The experiment results shows it not only applied the LFSR sequence′s outstanding performance but also implemented asynchronous encryption. It has a certain value of practical application.
Key word：
LFSR
FPGA
asynchronous encryption
View(14186)

Design and implementation of wide-field vision video processing system based on Zynq-7000

DOI：10.16157/j.issn.0258-7998.2016.06.016

Author：Han Deqiang，Yang Liping，Wang Zongxia

Author Affilications：College of Computer，Beijing University of Technology，Beijing 100124，China

Abstract：For the requirements of no blind-zone video recording in security monitoring and intelligent transportation area, the paper design a wide-field vision video processing system based on Zynq-7000 platform. Through the research of multi-channel real-time video mosaic technology based on embedded system, it design and implements video processing board, which is centered on the XC7Z020 chip, with co-scheduling service program running on Dual ARM Cotex-A9 processor，and video capture and pre-processing, projection transformation, image blending IP sub-system running on FPGA, and the customized video play function is realizeed through remote client. The experiment shows that the system is a portable solution both with stable performance and flexible area deployment.
Key word：
Zynq-7000
wide-field
Vivado HLS
real-time video mosaic
View(14226)

Design of linear CCD image acquisition and display system based on FPGA

DOI：10.16157/j.issn.0258-7998.2016.06.017

Author：Zhou Jingdong，Shen Piaohai，Wang Lei

Author Affilications：Research and Design Institute of Agricultural Mechanical Engineering，Hubei University of Technology，Wuhan 430068，China

Abstract：Color separator which utilized image acquisition , processing and display techniques was widely used in industrial and agricultural product testing. The common solution consisted of the FPGA, DSP/ARM and PC was complicated and expensive. This paper designed a system in which CCD image acquisition and display were implemented in one single FPGA chip. With FPGA-based image processing algorithms, image processing could also be integrated into this FPGA chip. Logic design of image acquisition and display was elaborated and it′s correctness was verified by both software and hardware testing. Above all,this system was simple and economical. After a proper transplant, this system could also be adopted in security checks and medical imaging.
Key word：
FPGA
linear CCD
image acquisition
image display
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Design and application of vehicle control unit for an electric light-truck

DOI：10.16157/j.issn.0258-7998.2016.06.018

Author：Bai Shuang，Huang Junzeng，Shi Chun，Wu Gang

Author Affilications：Institute of Industrial Automation，Department of Automation，University of Science and Technology of China，Hefei 230022，China

Abstract：This article mainly describes the design and application of a vehicle control unit for electric light trucks, which work in inferior conditions and are sensitive to energy consumption per kilogram. MC9S12XEQ512, a 16bit MCU made by Freescale Semiconductor Inc., is used as the core controller. In addition, PCB design, software framework and control strategy are careful designed for the typical need of electric light truck and for the probable interference. This design is suitable for the electric light truck and it has passed the relevant national standard. It is highly reliable and it meets the needs of the industry.
Key word：
vehicle control unit
electric light truck
hardware design
control strategy
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Measurement Control Technology and Instruments

Design and implementation of the verification platform for WBAN Baseband

DOI：10.16157/j.issn.0258-7998.2016.06.019

Author：Wu Kaibin，Chen Lan，Lv Chao

Author Affilications：Institute of Microelectronics，Chinese Academy of Sciences，Beijing 100029，China

Abstract：Verification test is an important step in the design process of the SoC. To solve the questions happened in the verification of the wearable Wireless Body Area Network(WBAN) baseband SoC, such as vector complex, high reliability of RF and results diversification，this paper designed and implemented a WBAN baseband verification platform. In the hardware，highly integrated FPGA(Altera-Cyclone III), RF chip(MAX2837) and mixed-signal front-end chip(MAX19712) were used to Improve the reliability of the system. In the software, a WBAN′s data stream state machine was designed to load multi-rate data stream automatically, and verify the Quality of Service(QoS). Currently, the platform accomplished a large number of test validation for the IEEE 802.15.6 baseband system which is developed independently by ourselves. The key indicators meet the needs of WBAN chip design verification, and also can be extended to verify other short-range wireless communication chips.
Key word：
wireless body area network
SoC verification
IEEE802.15.6 baseband
state machine
quality of service
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Research and implementation of PRACH signal detection in LTE-A system

DOI：10.16157/j.issn.0258-7998.2016.06.020

Author：Xu Hu1，2，Lin Yihui1，2，Liu Xiaogang1，2

Author Affilications：1.The 41st Research Institute of CETC，Bengbu 233010，China； 2.Anhui Province Key Laboratory of Electronic Measurement Technology，Bengbu 233010，China

Abstract：The paper analyzes the principle of physical random access signal detection, according to the ZC sequence，FFT and cycle correlation characteristics, and puts forward a fast and efficient PRACH detection method of eNodeB. It presents the performance of this method, and implements in DSP TMS320C6487 chip. In a word, it provides a solution for the implementation of PRACH detection.
Key word：
LTE-A
PRACH
preamble detection
DSP implementation
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EMC analysis and design for control system based on narrow-band HPM source of high-power electromagnetic environment

DOI：10.16157/j.issn.0258-7998.2016.06.021

Author：Jin Hui，Luo Min，Liu Zong

Author Affilications：Science and Technology on High Power Microwave Laboratory，Institute of Applied Electronics，CAEP，Mianyang 621900，China

Abstract：In allusion to the influence of narrow-band high power microwave(HPM) source electromagnetic environment on performance of control system, the interference source and coupling paths of electro magnetic interference(EMI) are researched through theoretical analysis and experimental measurements. Electro magnetic compatibility(EMC) design of the control system,electromagnetic shielding, filter and grounding are analyzed. Relevant measures are put in to practice too.These measures prove that the experiments on restraining EMI of high-power electromagnetic environment are effective and feasible.The design of control system satisfies the requirements of HPM source.Meanwhile,technical support is provided for protection on instruments and equipments in high-power electromagnetic environments.
Key word：
electromagnetic compatibility
high-power electromagnetic environment
narrow-band HPM system
electromagnetic shielding
filter
grounding
View(10816)

Fault diagnosis method of rolling bearing based on LCD and improved SVM

DOI：10.16157/j.issn.0258-7998.2016.06.022

Author：Zhang Meiling1，Hu Xiao2

Author Affilications：1.College of Information and Electrical Engineering，China University of Mining and Technology，Xuzhou 221116，China； 2.College of Mechanical and Electrical Engineering，China University of Mining and Technology，Xuzhou 221116，China

Abstract：According to the characteristics of nonlinear and non-stationary of rolling bearing vibration signals, a new method of bearing fault diagnosis based on local characteristic-scale decomposition(LCD) and improved support vector machine(SVM) is proposed. Firstly, bearing vibration signals were decomposed by LCD, and a series of intrinsic scale components(ISC) were obtained. Through comparative study with empirical mode decomposition(EMD), the superiority of the LCD method was proved. Then the energy entropy of all components were calculated and bearing signal sensitive feature sets were extracted, which were input to SVM after parameter optimization by genetic algorithm(GA). The diagnostic identification of bearing condition was completed. Experimental studies have shown that the bearing diagnosis algorithm can effectively extract the bearing fault feature information based on LCD and improved SVM, which could identify four rolling bearing types beyond 90%. It is a very effective rolling bearing fault diagnosis method.
Key word：
rolling bearing
local characteristic-scale decomposition
genetic algorithm
support vector machine
fault diagnosis
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Four camera optical touch screen system developed based on the ARM

DOI：10.16157/j.issn.0258-7998.2016.06.023

Author：Pei Chenglong，Wei Zhipeng，Yang Liang

Author Affilications：School of Information Science and Engineering，Shenyang University of Technology，Shenyang 110870，China

Abstract：Aiming at the large touch screen is expensive, poor universality limitations, four cameras optical touch screen system based on ARM is built using image recognition technology. System synchronously samples touch screen images by installed in 4 vertices of the CMOS camera, ARM microprocessor using touch point detection to acquired images, based on contact image position and camera demarcation to get contact direction of linear, finally, by calculating two arbitrary lines intersected in one point to determine the contact position. Experiments show that this system of single point and two-point touch can achieve 99% recognition rate and contact coordinates of the location error is less than 2%.
Key word：
four cameras
image recognition
touch point positioning
optical touch scree
View(6892)

A new time-frequency analysis method of sinusoidal frequency modulation signals based on sparse decomposition

DOI：10.16157/j.issn.0258-7998.2016.06.024

Author：Quan Shengrong，Zhang Tianqi，Wang Junxia，Ma Baoze

Author Affilications：Chongqing Key Laboratory of Signal and Information Processing，Chongqing University of Posts and Telecommunications， Chongqing 400065，China

Abstract：For the serious cross-terms interference problem of sinusoidal frequency modulation(SFM) signal Wigner-Ville distribution(WVD), a new time-frequency analysis method based on sparse decomposition is proposed. Firstly, the Gabor atom dictionary is constructed by signal time-frequency parameters, then the signal sparse decomposition is realized by using matching pursuit(MP) algorithm, and combined with the improved genetic algorithm to search the best matching atoms. Finally, the matching Gabor atoms constitutes the signal WVD without cross-terms through the Wigner-Ville transform in turns. Simulation results verify that the proposed method is efficient, it can improve the computational efficiency of signal decomposition, and a few Gabor atoms can represent signal WVD by a flexible selecting way. Compared with traditional time-frequency analysis methods, it can effectively restrain the time-frequency cross-term interference, and maintain a high time-frequency resolution.
Key word：
SFM
WVD
cross-terms interference
sparse decomposition
time-frequency resolution
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ADRC control based on PSODE hybrid algorithm

DOI：10.16157/j.issn.0258-7998.2016.06.025

Author：Wang Zihao，Yang Xiaojian

Author Affilications：School of Computer Science and Technology，University of Nanjing Technology University，Nanjing 211816，China

Abstract：According to the problem that the optimal parameters are difficult to be determined in the process of active disturbance rejection controller, a hybrid PSODE algorithm is proposed. It sets up the process of linear ADRC parameter optimization controller, uses the ITAE value the system dynamic performance evaluation as a child, and adds the punishment strategy for larger amplitude retracement output. For solving the problem of how to optimize ADRC control parameters, mixing PSODE algorithm is raised: When PSO′s search is stagnant, asynchronously and intermittently, the pbest space will be mutant under new algorithm, and the small inertia weight particle converges, which balances the global and local search ability of the algorithm. Finally the proposed control algorithm is used to control the boiler superheated steam temperature system simulation model. The results show that the optimized control system has good control performance and robustness.
Key word：
ADRC
parameters optimization
mutation
DE
PSO
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Communication and Network

A raspberry pi based evasive penetration test approach

DOI：10.16157/j.issn.0258-7998.2016.06.026

Author：Tao Xiaoling1，2，Wu Xin2，Kang Ruinan2

Author Affilications：1.Guangxi Colleges and Universities Key Laboratory of Cloud Computing and Complex Systems， Guilin University of Electronic Technology，Guilin 541004，China； 2.School of Information and Communication，Guilin University of Electronic Technology，Guilin 541004，China

Abstract：With the increase of APT attacks year by year, conventional penetration test approaches cannot meet the requirements of the diverse network security detections in current network environment. In this paper, evasive penetration test methods are investigated from the physically security vulnerabilities. A PT penetration test approach that seeding the raspberry pi as a spy is proposed as well. The approach disguises the control flows as the HTTPS flows using the tunnel technologies and camouflage techniques, which enable secure communication between raspberry pi and C&C server. Meanwhile, to achieve the evasive effects eventually, the Tor network is used to realize the anonymity for penetration testers. Finally, the experiment results show the evasive of the approach and clarify the threats that such attack can cause. The proposed approach provides reference for the security for officer to defend and detect the APT/PT attack.
Key word：
penetration test
raspberry pi
evasive
persistent threat
tunnel
Tor network
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Reaserch of coverage ratio and energy saving in wireless sensor network

DOI：10.16157/j.issn.0258-7998.2016.06.027

Author：Liu Wei1，Hu Anlin2

Author Affilications：1.Tianhua College，Shanghai Normal University，Shanghai 201815，China； 2.Shanghai Gongjin Electronics Limited Company，Shanghai 200233，China

Abstract：Due the limited energy of sensor nodes in wireless sensor network, overlap area of coverage among sensor nodes should be reduced, and the energy must be intelligently used to increase network lifetime. Therefore, we propose an energy aware-based area coverage algorithm. In this algorithm, the active sensing nodes are determined by the area they covered and their residual energy values. The work aims to minimize the number of active nodes on the basis of preserving the coverage of network. Results from simulation show that algorithm offers better performance in terms of coverage ratio and achieves better lifetime compared to the others.
Key word：
wireless sensor network
energy aware
coverage ratio
network lifetime
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A GMSK demodulator with frequency offset estimation and calibration

DOI：10.16157/j.issn.0258-7998.2016.06.028

Author：Zheng Jingyi1，Gao Shaoquan1，Jiang Hanjun1，Zhang Chun1，Wang Zhihua1，2，Jia Wen2

Author Affilications：1.Institute of Microelectronics，Tsinghua University，Beijing 100084，China； 2.Research Institute of Tsinghua at Shenzhen，Shenzhen 518055，China

Abstract：This paper proposes a Gaussian minimum shift keying(GMSK) demodulator structure used in a zero-IF Bluetooth low energy(BLE) transceiver. GMSK is one of the continuous phase modulation(CPM), the primary basis for demodulation is the change of phase. The carrier frequency offset between the transmitter and the receiver affects the phase changes, so a frequency offset estimation and calibration algorithm is presented. The algorithm combines improved one bit differential operation for demodulation and coordinate rotation digital computer(CORDIC) algorithm, which is less complex than the conventional frequency offset estimation algorithm. With a frequency offset within 150 kHz, the signal noise radio(SNR) difference for 0.1 percent bit error rate(BER) demand is 1 dB to the most. This GMSK demodulator is realized in Verilog and validated using FPGA.
Key word：
Gaussian minimum shift keying
demodulation
frequency offset
one bit differential operation
coordinate rotation digital computer
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AGC design for non constant envelope burst communication

DOI：10.16157/j.issn.0258-7998.2016.06.029

Author：Liu Meirui

Author Affilications：No.10 Institute of China Electronics Technology Group Corporation，Chengdu 610036，China

Abstract：In the non constant envelope burst communication system, the automatic gain control(AGC) of receiver requires fast response and low distortion introduced. Compared to the traditional AGC circuit whose response time is not adjustable, this paper presents a variable speed AGC design which is suitable for the burst communication. According to the frame structure characteristics of the burst signal, the response speed of this AGC circuit can be switched in real time. When the burst signal arrives, the AGC circuit is quickly stabilized, after which it returns to slow hold mode, and when the burst is complete, the AGC circuit is triggered into fast release mode. The AGC scheme is implemented by simple analog circuits, and the test results show that the settling time is short, the release rate is fast, and the signal distortion is small. In a word, this AGC scheme is suitable for burst communication, especially for non constant envelope burst communication system.
Key word：
non constant envelope
burst communication
automatic gain control
response time
signal distortion
frame structure
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Recursive least square based sparse channel estimation under non-Gaussian noise background

DOI：10.16157/j.issn.0258-7998.2016.06.030

Author：Zhu Xiaomei1，Huang Ying1，Bao Yaping1，Gui Guan2

Author Affilications：1.College of Computer Science and Technology，Nanjing Tech University，Nanjing 211816，China； 2.Institute of Signal Processing and Transmission，Nanjing University of Posts and Telecommunications，Nanjing 210003，China

Abstract：Most of the proposed channel estimation algorithms are based on the assumption of Gaussian noise model. In actual wireless communication environment, however, the existence of impulse noise makes it no longer satisfy the Gaussian noise model, but meet the generalized Gaussian distribution(GGD) noise model. The traditional adaptive channel estimation algorithm, such as recursion least square(RLS) algorithm, cannot suppress the non-Gaussian noise interference. Under this background, a RLS channel estimation algorithm, which inhibits the non-Gaussian noise interference，is proposed. The proposed algorithm exploits sparse structure information effectively by introducing two kinds of sparse constraint functions(L1-norm and L0-norm) into the standard RLS algorithm. The Monte Carlo simulation results show that the proposed algorithm has the better estimation performance than the standard RLS.
Key word：
generalized Gaussian distribution
sparse channel estimation
recursive fast square algorithm
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Research on power line communication signals recognition based on wavelet transform

DOI：10.16157/j.issn.0258-7998.2016.06.031

Author：Li Kun1，Liu Tao2，Wang Yongjian3，Jiang Hong1

Author Affilications：1.School of Information Engineering，Southwest University of Science and Technology，Mianyang 621010，China； 2.College of Geophysis and Information Engineering，China University of Petroleum-Beijing，Beijing 102249，China； 3.National Computer Network and Information Security Management Center，Beijing 100031，China

Abstract：In power line digital communication signal recognition research, in view of the power line communication has strong noise interference and the current situation of recognizer algorithm is complex, this paper designs a signal diagnosis with simple algorithm and small amount of calculation. Under the condition of the input noise is the background noise, the method of wavelet transform is used to extract the characteristics of power line digital communication signals. By statistical recognition model to get the optimal threshold, the threshold value is compared with the signal characteristic value, finally the signal modulation type is identified. Simulation results show that the correct identification rate between inter-class and intra-class reaches 93% and 95% when the SNR is 5 dB, respectively.
Key word：
digital signal recognition
power line communication
background noise
wavelet transform
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Computer Technology and Its Applications

Verification of BPMN processes based on the unified modeling platform

DOI：10.16157/j.issn.0258-7998.2016.06.032

Author：Wang Keli1，Wu Shuhong1，Wang Yaoli2

Author Affilications：1.College of Computer Science and Technology，Taiyuan University of Technology，Taiyuan 030024，China； 2.College of Information Engineering，Taiyuan University of Technology，Taiyuan 030024，China

Abstract：To tackle the problems of non-unified platform and poor portability in business process design, formal analysis and verification phase, this paper introduces a formal verification protocol which is based on our unified modeling platform to process the output processes of Business Process Model Notation(BPMN2.0) model. First of all, the formal modeling platform is built based on Java language and its input is directly from the output of BPMN model. Then, a Java code based verification approach for Business Processes Modeling method is proposed by using the BPMN 2.0 standard. In this way after the modeling phase, the created Java code can be automatically run in order to find out possible deadlocks and livelocks. Finally, complex system corresponding instances are introduced to demonstrate the effectiveness of our method.
Key word：
BPMN2.0
process verification
complex system
deadlock
livelock
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Research of vehicle intelligent video surveillance system based on Android platform

DOI：10.16157/j.issn.0258-7998.2016.06.033

Author：Wang Hao1，Han Min1，Dong Jie2

Author Affilications：1.Faculty of Electronic Information and Electrical Engineering，Dalian University of Technology，Dalian 116024，China； 2.School of Information Science and Engineering，Dalian Polytechnic University，Dalian 116034，China

Abstract：For solving the problems of low network utilization and poor realtime performance in traditional vehicle video surveillance, this paper proposes the solution of vehicle video surveillance based on Android platform, key modules of this system are researched in detail. P2P and C/S mixed architecture, multi-thread mechanism, processing of package loss and reordering are used to improve the real-time monitoring performance.The experimental results show the system can real-time and efficiently monitor the vehicles ,which conducive to expand to the intelligent transportation.
Key word：
P2P
heartbeat mechanism
NAT
FFmpeg
multithread
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Evaluating degeneration ratio of train damper using Copula function

DOI：10.16157/j.issn.0258-7998.2016.06.034

Author：Yan Yunhua1，Lv Qianyong2，Qin Na2

Author Affilications：1.Changzhou Institute of Mechatronic Technology，Changzhou 213164，China； 2.School of Electrical Engineering，Southwest Jiaotong University，Chengdu 610031，China

Abstract：To evaluate the mechanical wear degree of key component of high-speed train bogie, an approach using copula function to evaluate damping degeneration ratio of yaw damper is proposed in the paper. Vibration signals of a certain high-speed train are obtained under different degeneration ratios. The vibration signal is decomposed by wavelet packet filters first. The marginal distribution function of the signal is fitted by generalized Gaussian distribution. The joint probability distribution between degenerate signal and the normal signal is computed by Gaussian Copula function. The mean of joint probability density function is extracted as the feature and the degeneration ration of target signal is evaluated. The vibration signals of different parameter degeneration ratio of high-speed train bogie yaw damper are used to do experiments using the proposed method and compared with the real degeneration ratio. Experiment results shows the error is within negative 3 percentages to 3 percentages at the speed of 200 km/h, which verifies the effectiveness of the proposed degeneration ratio evaluation method.
Key word：
high-speed train
Copula function
degeneration ratio evaluation
joint probability density function
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Object component fitting computation based on 2-dimensional mixed Gaussian model

DOI：10.16157/j.issn.0258-7998.2016.06.035

Author：Lang Bo，Fan Yina，Huang Jing，Wang Peng

Author Affilications：School of Information Technology，Beijing Normal university Zhuhai，Zhuhai 519087，China

Abstract：For representing image prototype, minor price, more efficient and more flexible, this paper designs an object fitting algorithm which conforms human′s recognition mechanism and has much intelligibility based on recognition-by-component theory. The designed algorithm uses mixture of 2-dimensional Gaussian component to fit the object′s edge images, and makes object representation from single pixel converted into component. For seek more robust fitting algorithm, a Split-Convergence mechanism is introduced to amend the fitting results. The experimental results demonstrated that this fitting algorithm can well describe the object feature component, and laying a good foundation for image high-level semantic processing.
Key word：
prototype representation
object recognition
2-dimensional Gaussian
component theory
fitting
View(5734)

Power Supply Technology and Its Application

Design of voltage regulator module in battery monitoring chip

DOI：10.16157/j.issn.0258-7998.2016.06.036

Author：Zhang Meng1，2，Lin Min1，Cheng Xinhong1，Li Xinchang1，2，Wu Zhonghao1

Author Affilications：1.Shanghai Institute of Micro-System and Information Technology，Chinese Academy of Science，Shanghai 200050，China； 2.University of Chinese Academy of Sciences，Beijing 100049，China

Abstract：This paper presented a voltage regulator module ,which was applied in the battery monitoring chip and provided analog power supply voltage and digital power supply voltage for the whole chip. In this design ,band-gap reference circuit generated analog power supply voltage stably, digital power supply voltage was gained by adding the gate-source voltages. This circuit was designed by XFAB 0.35 ?滋m standard CMOS process and Cadence Spectre simulations showed that the change of the analog power supply voltage was 12 mV when the load current was 4 mA and the battery voltage was from 10 V to 60 V，the variation of the analog power supply voltage was 6 mV and the temperature coefficient was 7.8 ppm/℃ in the temperature range of -40 ℃～125 ℃ and the load current was 4 mA; The change of the digital power supply voltage was 0.12 V and 0.76 V respectively, they were all qualified in the actual applications. This module could provide power-on reset signal reliably and also have functions of over current protection and temperature protection.
Key word：
battery monitoring
voltage regulator module
power-on reset
over-current protection
over-temperature protection
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Development of single phase EPS based on DSP2812

DOI：10.16157/j.issn.0258-7998.2016.06.037

Author：Yang Jun，Li Xiaoning，Li Junlong，Zhang Wenrui

Author Affilications：University of Electronic Science and Technology of China，Chengdu 611731，China

Abstract：The emergency power supply is an independent device providing temporary power to customers when the grid power supply is abnormal. In order to overcome the disadvantages of the conventional single stage inverter circuit, which is too much for the battery to be maintained, the Boost- inverter two stage circuit is adopted in this paper, and design a 3.6 kW single-phase emergency power supply based on the DSP2812. It mainly studies the selection method of the parameters of the main components and the control method of the inverter system. Finally, the test and analysis are carried out to prove the feasibility of the system.
Key word：
emergency lighting power supply
inverter system
DSP
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A new “one-step” boosting type matrix converter

DOI：10.16157/j.issn.0258-7998.2016.06.038

Author：Hu Kaimin，Wan Heng，Zou Yuanwei，Jin Jing

Author Affilications：School of Electrical and Electronic Engineering，Shanghai Institute of Technology，Shanghai 201418，China

Abstract：Due to the structural design of the traditional matrix converter, the voltage transfer ratio is limited to 0.866. In this paper, we proposed a new “one-step” boosting type matrix converter which can make the voltage transfer ratio variable from the perspective of changing the topological structure. Meanwhile, it also helps to make the voltage transmission easier and enhance the reliability of commutation so as to solve the problem of low ratio.
Key word：
matrix converter
voltage transfer ratio
topological structure
commutation
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Analysis of the output stability influenced by inductance of pulsed power supplies

DOI：10.16157/j.issn.0258-7998.2016.06.039

Author：Zhuang Li，Zhang Jun，Dong Jiannian

Author Affilications：School of Energy and Power Engineering，Nanjing University of Science and Technology，Nanjing 210094，China

Abstract：The value of modulation inductance has relationships with the output of pulsed power supplies. Relative mathematical models were established, combined with partial experimental data, and circuit software was used to simulate and analyze outputs of a single PFN topology influenced by changing inductance values. The output effects of the modulation inductance on multiple PFN topologies in different coupling conditions was also discussed. Simulation results show that the mutation of the inductance value is more likely to cause adverse effects on the output of pulsed power system during actual discharging process, and then reduces launching accuracy. For large inductance used to propulsion coil guns, inductance coupling will increase the relative inductance values between each modules and slow the current drop speed in the late PFN discharge, decreasing the emission efficiency of the instruments.
Key word：
pulsed power supply
discharge currents
inductive mutation
coupling factor
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