Home > Archive > 2013 No. 05

2013 No. 05

Publish Date：2013-05-06
ISSN：0258-7998
CN：11-2305/TN
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Embedded Technology

Design of detecting instrument for certain aero-engine temperature controller based on ARM-WinCE

Author：Wang Dapeng1，Fan Huilin1，Chen Danqiang1，Bao Xueliang1，Li Qiang2

Author Affilications：1.Campaign and Command Department，Aviation University of Air Force, Changchun 130022，China； 2.Unit 93802 of PLA, Xianyang 712201，China

Abstract：Based on the ARM processor and WinCE embedded systems, this paper provided a detecting instrument design and introduced the hardware and software design. In software design, the operating system was customized, hardware drivers were programmed and real-time display of detected data was achieved through multi-threading technology. The software has data saving and failure analysis functions. The relationship between pulse frequency under test and detection opportunity was obtained. The results show that the detecting instrument assumes good stability, high accuracy and convenient operation. The design ideas and engineering methods are references to real-time physical quantities detecting of low-frequency pulse signal.
Key word：
aero-engine
temperature controller
automatic detection
ARM-WinCE
software design
View(10278)

Design of the Camera Link-HDMI converter based on Cyclone IV

Author：Liang Yitao1，Tang Yao2，Shi Weiya1，Wang Feng1，Li Yonggang1

Author Affilications：1.School of Information Science and Engineering，Henan University of Technology，Zhengzhou 450001，China； 2.Xi′an Institute of Optics and Precision Mechanics of CAS，Xi′an 710119，China

Abstract：In order to meet one project requirements, based on fully understanding to the Camera Link protocol and the HDMI interface protocol, a design scheme of Camera Link-HDMI converter is presented. According to the scheme, one Cyclone IV device which is Altera′s FPGA device is chosen. And the converter is made and tested. The testing results show that real-time of the image conversion has been ensured. And colors and graphics of the image were without distortion. The design demand was met. The scheme is a method to take Camera Link-HDMI conversion, and may be a useful reference for similar techniques design.
Key word：
video processing
FPGA
Camera Link
HDMI
interface converter
View(16854)

Design of the IIC interface control module of OLED microdislay based on FPGA

Author：Ran Feng，He Linqi，Chu Chu

Author Affilications：Microelectronic R&D Center, Shanghai University，Shanghai 200072，China

Abstract：As a new microdisplay, OLED microdisplay has many advantages.According to the OLED microdisplay mostly using IIC interface,we designed the IIC control module for OLED microdisplay′s IIC interface based on FPGA EP2C8Q208C8 using Verilog language and adopting the modular structure. The control module includes writing data storage module, reading data storage module, data reading and writing module,which realize the read and write operation of the OLED microdisplay internal registers accurately and effectively.
Key word：
OLED microdisplay
modular design
FPGA
IIC interface
View(9322)

Implementation of LwIP porting based on μC/OS-Ⅲ

Author：Han Deqiang，Yang Qishan，Wang Zongxia，Gao Xueyuan

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

Abstract：Ethernet is an important module for embedded system. This paper discusses how to port LwIP 1.4.0 into the latest real-time operating system μC/OS-Ⅲ, and enable it with a network communication function. The detailed porting process of the LwIP on TI LM3S9B95 development platform is described and the experimental results are presented.
Key word：
porting
LwIP
μC/OS-Ⅲ
View(11614)

Realization and simulation of demodulation and descramble in TD-LTE system based on FPGA

Author：He Dengping，Jiang Caoyong，Li Xiaowen，Bu QingmingChongqing Key Lab of Mobile Communications，Chongqing University of Posts and Telecommunications，Chongqing 400065，China

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

Abstract：This paper mainly realizes demodulation and descramble in TD-LTE system. It includes the introduction of demodulation and descramble，max-log-map algorithm，projects form，the process of FPGA implementation and the results analysis. Then it finishes simulation, synthesis and verification of board on Virtex-6.The results show that this algorithm of demodulation and descramble have a high effectively and good reliability to TD-LTE RF conformance testing instrument.
Key word：
FPGA implementation
TD-LTE system
demodulation and descramble
max-log-map algorithm
View(15200)

Realization of BootLoader of embedded system based on ARM+DSP in LTE

Author：Chen Fatang，Guo Liqiang

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

Abstract：This article selects the embedded system of C6A8168 based on ARM+DSP, describing the design and realization of BootLoader which is to start of the system of dual-core according to the requirements of TD-LTE. It includes the path from the designing of interrupt vector and the startup of main core to the entering into the main process. And more, this article mainly describes the differences between system of dual-core and that of single CPU in detail. The BootLoader starts the system of ARM+DSP successfully as well as realizes the base requirement of the system of TD-LTE radio coherence.
Key word：
embedded
dual-core
ARM
DSP
BootLoader
View(8530)

Design and development of a new embedded ambulatory blood pressure monitoring system

Author：Deng Chen1，Liang Xiaofeng2，Liang Jianru1，Teng Xudong1

Author Affilications：1.Institute of Electrical and Electronic Engineering，Shanghai University of Engineering Science，Shanghai 201600，China； 2.Xi′an Rironic Electronic Technology Co.，Ltd.，Xi′an 710075，China

Abstract：This paper proposes a design program of embedded dynamic blood pressure monitor based on ARM Cortex-M3. An improved algorithm is put forward in this scheme，which uses Gauss distribution curve to fit the envelope of human pulse wave. The experimental results show that the method is effective.
Key word：
ambulatory blood pressure measurement
embedded microprocessor
Gauss curve fitting
peak envelope
View(6378)

Application of Integrated Circuits

Principle analysis and test on BD2 single direction time transfer

Author：Zhai Kunpeng1，He Wentao1，2，Xu Jianhua1，2，Ye Tianchun1

Author Affilications：1.Institute of Microelectronics of Chinese Academy of Sciences，Beijing 100029，China； 2.Hangzhou Zhongke Microelectronics Co.，Ltd.，Hangzhou 310053，China

Abstract：In this paper, the principles of GNSS time transfer were described with emphasis being placed on the so-called single direction method. The sources of error during GNSS time transfer were discussed and the accuracy was analyzed. After that the availability of timing service from BD2 navigation satellite system was verified by a self-developed GPS/BD2 multi-system receiver. The test result shows that the timing accuracy of BD2 is better than 10 ns(1σ).
Key word：
BD2
GPS
single direction timing
1PPS
View(4658)

A high PSRR and low temperature coefficient bandgap reference

Author：Zhu Longfei，Mo Taishan，Ye Tianchun

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

Abstract：A new BGR circuit with high PSRR and low TC is proposed. The PSRR performance of BGR is discussed in detail, especially at high frequency. Then, a high PSRR over a wide frequency range is achieved. The circuit is fabricated in 0.35 μm BiCMOS process. Simulation results show that the PSRR is -108.5 dB at 1 Hz, and -58.9 dB at 15 MHz. A second order curvature compensated circuit is designed. The temperature coefficient is as low as 1.5 ppm/℃ over a temperature range -40 ℃ to 95 ℃.
Key word：
bandgap reference
PSRR
second order curvature compensated
View(10434)

Design and implementation of memory system in heterogeneous multi-core GPU

Author：Xiao Lingzhi1，Pu Lin2，Han Jungang1，Li Tao2

Author Affilications：1.School of Computer Science & Technology，Xi′an University of Posts & Telecommunications，Xi′an 710061，China； 2.School of Electronic Engineering，Xi′an University of Posts & Telecommunications，Xi′an 710061，China

Abstract：A hardware method for heterogeneous multi-core graphic processor unit(HMGPU) memory management system is proposed in this paper. Fixed-partition is used to manage big-block and continuous data，and paging management methods is used to manage small-block and non-continuous data.The memory management system is designed and simulated in Verilog, and it is verified to be valid in FPGA. Experimental results show that the system can provide effectively 2 021.2 MB/s memory bandwidth for HMGPU.
Key word：
heterogeneous multi-core graphic processor
real-time and parallel
hardware method
memory management system
View(4074)

Research on the ENOB test methods of high-speed high-resolution ADC

Author：Li Haitao，Li Binkang，Ruan Linbo，Tian Geng，Tian Xiaoxia，Qu Hongguang，Wang Jing，Zhang Yanxia

Author Affilications：State Key Lab of Intense Pulsed Radiation Simulation and Effect，Northwest Institute of Nuclear Technology，Xi′an 710024，China

Abstract：The performance parameters of ADC, especially the ENOB, are introduced in the paper. After the discussion of several test methods of ADC performance parameter, a test solution for ENOB is put forward. The application of the FFT method in the ENOB test is analyzed, including spectral leakage, coherent sampling and windowing functions, etc. An improved FFT methods is used in the ADC ENOB test, and the ENOB of ADS5400 working at 400 MS/s is 9.12 bit(fin=1.123 MHz).
Key word：
ADC ENOB
FFT
ADS5400
View(12022)

A high gain CMOS wideband LNA with noise cancelling

Author：Dong Yezi1，2，Zhang Peng1，Mao Luhong2

Author Affilications：1.National Ocean Technology Center；Tianjin 300112，China； 2.School of Electronic and Information Engineering, Tianjin University，Tianjin 300072，China

Abstract：A CMOS wideband low noise amplifier is presented for multi-standard applications. Noise cancelling and local feedback are used in this design, as well as a gate inductor is used in order to compensate the gain loss at high frequency. These lead to a LNA with high gain and low noise, and achieve a flat gain in pass-band. The design is realized with UMC 0.18 μm process. According to the post simulation result: Consuming 9.45 mW from a 1.8 V supply, the LNA achieves a maximum power gain of 23 dB and a NF of 1.7 dB~5 dB over a 3 dB bandwidth of 0.1 GHz~1.35 GHz; and under a 1 V supply, the circuit can remain a good performance.
Key word：
wideband low noise amplifier
noise cancelling
local feedback
inductor peaking
CMOS integrated circuits
View(6890)

Design of a 12-bit 500 MS/s segmented current-steering D/A converter

Author：Li Jia

Author Affilications：Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei 230027，China

Abstract：Based on TSMC 0.18 μm CMOS technology, a 12-bit 500 MS/s D/A converter with 3.3 V analog supply voltage and 1.8 V digital supply voltage was designed using segmented current-steering structure. Simulation results showed that when sampling at 500 MS/s, the SFDR at 70 MHz and 240 MHz input was 89.9 dBc and 77.6 dBc respectively.
Key word：
segmented current-steering
D/A converter
SFDR
View(6974)

Application research on Boost DC/DC conveners MAX756

Author：Gao Yingming1，Zou Nianyu1，Zhang Huanyue2，Cao Guangying1，Zhang Jinghui1，Jin Rencheng2

Author Affilications：1.Research Institute of Photonics, Dalian Polytechnic University，Dalian 116034，China； 2.Faculty of Mechanical Engineering & Materials and Energy, Dalian University of Technology，Dalian 116023，China

Abstract：Power supply unit with adjustable-output voltage and battery-aware function was designed by Boost DC/DC conveners MAX756 in order to power wireless sensor node. Key design principle of printed circuit board and schematic concerning MAX756 was presented. Relationship between input voltage and conversion efficiency of power supply unit was measured. According to the measurement，the conversion efficiency of power supply unit increased as input voltage and output current increased. Load transient response test shows that output voltage had greater noise when load current changed transiently, so filter of the power supply unit need to be improved.
Key word：
wireless sensor node
power supply unit
Boost DC/DC
load transit response test
View(6064)

Power Supply Technology and Its Application

Research on composite islanding detection method in distributed generation

Author：Li Yingying1，Ding Ning2

Author Affilications：1.Liabary of Henan Normal University,Xinxiang 453007，China； 2.Zhengzhou Railway Vocational and Technical College，Zhengzhou 450052，China

Abstract：In order to solve the islanding detection problem in the distributed generation systems, a new islanding detection algorithm is proposed based on summarizing the shortcoming of traditional islanding detection methods. The new algorithm combining with the advantages of traditional passive islanding detection methods and improved AFD method, the islanding identification is realized by organic combination of the two methods. Simulation are developed to validate the proposed method. The experimental results verify the good performance of the proposed method.
Key word：
distributed generation
grid-connected
inverter
islanding detection
simulation
View(5432)

Study on the technology of brake and energy regeneration for electric vehicles

Author：Qu Yanyan，Yan Gangfeng

Author Affilications：College of Electrical Engineering, Zhejiang University，Hangzhou 310027，China

Abstract：Based on the brake and energy regeneration control principle of brushless DC motor for electric vehicles (EV), a simple but effective control strategy of brake and energy regeneration was proposed. During the braking period, only the switching sequence of the inverter was changed so that the braking energy would return to the battery. In this way, the driving range of an EV was increased. The results of PSIM simulations and experiments prove that the proposed strategy can effectively realize energy regeneration for an EV.
Key word：
electric vehicles
brushless DC motor(BLDCM)
energy regeneration
View(7326)

Research on three-level intelligent transformer

Author：Zhou Zhenjun1，Li Lei2，Hang Jingyu1，Zou Xiaoyu1

Author Affilications：1.Avic Radar and Avionics Institute，Wuxi 214063，China； 2.Department of Automation, NUST, Nanjing 210094，China

Abstract：This paper proposes a new topology structure of three-level intelligent transformer. Firstly，researches the topology structure of SEPIC three-level intelligent transformer. The multi-level technology is applied to the topology, which can obviously reduce the voltage stress of switches and the volume of filter. Secondly, analyzes its working principle and switching mode, and designs transient voltage feedback control strategy with same capacitor voltage. In the end, a single phase principle prototype is made to verify the feasibility of new topology and correctness of control strategy. By experiment, results show excellent performance of prototype, and fully reflect the superiority of SEPIC three-level Intelligent Transformer.
Key word：
power electronic transformer
three-level
AC-AC converter
AC voltage regulator
SEPIC converter
View(6544)

Study on mechanism of capacitor compensated methods for the contactless power transmission system

Author：Xu Tianhao

Author Affilications：School of Automation, University of Electronic Science and Technology of China, Chengdu 610054，China

Abstract：This paper introduced some kinds of compensation methods of the magnetic coupling resonance contactless power transmission(CPT) system, analyzed the relationship between reflected impedance and frequency as well as the choice of original side compensation capacitor, derived expressions of transmission power when the CPT system use different compensation methods. Through analysis and simulation, results shows that the CPT system is optimized when the transmitter coil using series compensation, and the receive coil using parallel compensation.
Key word：
contactless power transmission
magnetic coupling resonance
capacitor compensate
View(12552)

Measurement Control Technology and Instruments

The research of micro digital controlled well logging surface system based on NiosII

Author：Yang Qingsheng, Zhang Xianhe, Zhan Xisheng

Author Affilications：Hubei Normal University College of Mechanical and Control Engineering, Huangshi 435002, China

Abstract：This paper researches a kind micro digital controlled well logging surface system based on the NiosII soft core.The data acquisition box is the most important part of the well logging surface system, using large scale programmable logic devices and SoPC technology, simplified acquisition box hardware structure, realize the acquisition box further miniaturization, improved the performance of the system,strengthened the maintainability and the expansibility of the system．
Key word：
NiosII sofe core
data acquisition box
programmable logical devices
View(5900)

The design of self-balancing two-wheel vehicle control system based on data fusion

Author：Wei Wen, Duan Chendong, Gao Jinglong, Li Changlei

Author Affilications：College of Electronic and Control Engineering, Chang’an University, Xi’an 710064, China

Abstract：In order to solve the problem of the large vibration interference and drift error of the sensor in self-balancing two-wheel vehicle system, and to improve the precision and real-time performance of the system attitude angle measurement, a method based on gyroscope and accelerometer data fusion is presented. On the basis of the establishment of self-balancing two-wheel system dynamics model, Kalman-Filtering algorithm is used to fuse the gyroscope and accelerometer signals in order to get the optimal estimate of system attitude angle and angular velocity. The self-balancing two-wheel vehicle control system is achieved by double closed loop digital PID algorithm. Through the hardware and software design, it verifies the feasibility and effectiveness of the method successfully, and the method greatly improves the anti-interference performance of self-balancing two-wheel system.
Key word：
data fusion
Kalman-filtering
two-wheel
self-balancing
View(7360)

Design of ZigBee-infrared control system for appliances in Internet of Things

Author：Zhang Yi, Zhang Lingzhi, Lu Wei

Author Affilications：College of Communication, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Abstract：With the rise of IoT(Internet of Things) technology, the ZigBee wireless communication technology is widely used. However, the Infrared communication protocol is now implemented in most household electric appliances. This paper proposed a system to help these appliances, which implemented with the Infrared communication protocol, join into IOT quickly and efficiently without any rebuild or redesign on the existing appliances, to realize centralized control , energy-saving control and intelligent control of different household electric appliances.
Key word：
Internet of Things
ZigBee
infrared communication
View(9310)

Design of intelligent temperature controller based on STC series microcontrollers

Author：Tang Hongfu1， Zhang Xingbo2

Author Affilications：1. National Computer System Engineering Research Institute of China, Beijing 100083, China; 2. Beijing Systems Control International, Inc., Beijing 100083, China

Abstract：An intelligent temperature control system based on single chip microcomputer STC12C5204AD was introduced. The paper described the development of the temperature measurement chip MAX6675,and illustrated the use of IAP(In Application Program) function and the communication module. The configuration parameters are flexible depended on the application environment, convenient remote operation, low cost, reliability and stability.
Key word：
STC microcontroller
MAX6675
RS485
IAP
View(16370)

Design of a virtual digital integrated circuits testing system based on VIIS-EM platform

Author：Yin Chaoping, Zhang Bingren, Zhao Jixiang

Author Affilications：Instrumentation & Electrical Engineering, Jilin University, Changchun 130026, China

Abstract：According to the concept of the modularization virtual instrument, this paper has designed a kind of Digital Integrated Circuits Testing System and discussed its realization scheme. It uses VIIS-EM platform as the core of the instrument and LabVIEW as the programming tool in the computer. It specifically analyzed the construction of hardware and software control flow. It gives the actual signal test results in the end.
Key word：
virtual instrument
VIIS-EM，LabVIEW
digital integrated circuit
View(5716)

The design of temperature and level measurement and control system of multiple tanks based on LabVIEW

Author：Guo Fengyu1,2, Zhang Lei1,2

Author Affilications：1. Institute of Information and Electrical, China University of Mining and Technology, Xuzhou 221008, China; 2. Institute of Electronic Engineering, Huaihai Institute of Technology, Lianyungang 222005, China

Abstract：Aiming at the current problems occurred in temperature and level control of the multi-tank, such as temperature control inaccurate, complicated operation, no host computer control operation and process data, and so on, a novel temperature and level control system is designed , in which the MPS-010602 multifunction USB signal acquisition card is used as the core. The host computer program is compiled with LabVIEW. The temperature and level parameters can be modified according to the actual situation. Meanwhile, the system can implement the functions that acquisition and real-time display of the temperature and level of the tank, data pracessing and storage and playback.
Key word：
LabVIEW
acquisition card
temperature sensor
RS485
View(15384)

Research and design of remote monitoring system for cold-chain transport based on RFID

Author：Gong Yulong, Wang Jinhai, Xu Shufang

Author Affilications：College of Electronics and Information Engineering, Tianjin Polytechnic University, Tianjin 300387, China

Abstract：In this paper, a remote monitoring system for cold-chain transport is developed based on RFID. The system is composed of vehicle terminal and monitoring center. Vehicle terminal consists of the microcontroller STC12C5A60S2, SIM300 wireless communication module, GPS positioning module u-blox neo, RFID electronic tag and reader. It has the function of data acquiring， preprocessing and transferring. Monitoring center makes use of thread pool technology to receive, analyse and online display temperature, humidity and orientation data. The experimental results show that the system has a high reliability characteristic and low-cost hardware. It can display data in real-time function, and is suitable for extending and enlarging in cold-chain industry.
Key word：
cold-chain transport
RFID
STC12C5A60S2
thread pool
vehicle terminal
View(16618)

Communication and Network

Multi-constraints QoS routing protocol based on dynamic programming in Ad Hoc

Author：Liu Xiaopeng, Chen Xihong, Liu Shaowei

Author Affilications：Air Defense & Antimissile Institute, Air Force Engineering University, Xi’an 710051, China

Abstract：For the solving problem of multi-constraints QoS routing protocol, the limitation of heuristic algorithm consists in its long path finding time. To solve this problem, a multi-constraints QoS routing based on dynamic programming is put forward , which use dynamic programming to optimize the criterion. The protocol finds several routes which can satisfy the requirement of the data bandwidth, then the destination node search for the route which has the shortest delay by the dynamic programming. The description of the routing protocol is divided into two aspects, the packet structure and the flow of route. At last, the passage compare the routing protocol with the traditional DSR routing in delay time, packet delivery fraction and routing overhead through the simulation , and draw a conclusion that the routing protocol can improve performance obviously for massive Ad Hoc network.
Key word：
Ad Hoc
QoS
dynamic programming
multi-constraints
View(5526)

A data gathering and fusion algorithm based on energy optimization for WSN

Author：Ding Juan, Liu Sanyang, Zhang Ping

Author Affilications：School of Science, Xidian University， Xi′an 710071，China

Abstract：To solve the overloading problem of cluster head in LEACH, an improved data gathering and fusion algorithm named LEACH-E is proposed. In the stage of establishing cluster, the selection of cluster heads takes into account the residual energy and their relative distance. In the communication phase, the cluster heads make data fusion first by the principal components analysis method for dimensionality reduction, and then transmit the data along the optimal path searched by the ant colony algorithm to the base station in multi-hop manner. The simulation results show that, compared with the LEACH, the LEACH-E performs much better in the aspects of the uniform clustering, energy balancing, and lifetime prolonging.
Key word：
WSN
routing
energy
data fusion
View(4866)

Blind estimation for PN code of reconnaissance signal combined with quadratic frequency modulated and pseudo-random binary phase code

Author：He Danna, Zhang Tianqi, Gao Li, Gao Hongxing

Author Affilications：Chongqing Key Laboratory of Signal and Information Processing (CQKLS&IP), Chongqing University of Posts and Telecommunications (CQUPT), Chongqing, 400065, China

Abstract：A new algorithm is proposed to blindly estimate the pseudo noise(PN) code of reconnaissance signal combined with quadratic frequency modulated(QFM) and pseudo-random binary phase code (PRBC),which is based on the methods of cubic phase function(CPF) and spectrum shifting. Firstly, square method is computed to eliminate the phase mutation, which induced noise degradation. Then, Method of CPF based on cumulative mean is adopted to estimate second and third coefficients, and the coefficients are used to reconstruct the index. The original signal is multiplied by the conjugated index to get a new compound signal. And then, the real part of the new compound signal consists of sine carrier and the PRBC signal, and the original PN code can be restored by the way of spectrum shifting. Simulation results show that the algorithm is feasible, and correct rate of PN code estimation is more than 0.9 when signal-to-noise ratio is more than or equal to 1 dB, which shows good performance.
Key word：
QFM-PRBC
blind estimation of PN code
CPF
spectrum shifting
View(4976)

Analysis of the received SIR within the Macro-Femto twin-layer networks

Author：Zhang Jie, Li Guangjun

Author Affilications：SCIE UESTC，Chengdu 611731， China

Abstract：The femtocells are proposed to off-load the huge traffic demand in future network, where the femtocells are deployed within the traditional macrocells. As a result, a twin-layer macro-femto network is formulated, where the femtocells are randomly deployed within the macrocell. In this paper, we investigate the received signal-interference-ratio(SIR) of this twin-layer network, where the femtocells are distributed according to spatially poisson point process(SPPP). We derived the spatially averaged complementary distribution function(CDF) of the received SIR. Our simulation results demonstrate that the derived CDF is capable of matching the simulation results accurately. As a result, the proposed method may be employed to the analysis and design of this twin-layer network.
Key word：
SIR
fluid model
SPPP
femtocell
View(6558)

Mutual coupling error correction algorithm based on the uniform circular array

Author：Lu Zukun， Gao Ying， Shi Yu， Liu Yang

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

Abstract：Mutual coupling effect had a serious impact on the performance of DOA estimation between the array elements. Based on the uniform circular array, a DOA estimation and mutual coupling error self-correction algorithm was proposed under the condition of mutual coupling effect. The mathematical model of mutual coupling error was built which used the banded circulant matrix. Then, the mutual coupling matrix and DOA was estimated which used the MUSIC algorithm and iterative methods at the same time. Self-correction method did not require any auxiliary array element , and can implement two types of parameters estimates. Simulation result shows that the algorithm has a good solution to the problem of uniform circular array mutual coupling, and can estimate the DOA and mutual coupling error accurately.
Key word：
uniform circular array
mutual coupling error
DOA estimation
multiple signal classification(MUSIC)
array signal processing
View(5842)

Pole characteristic analysis of folded dipole array-based chip-less tag

Author：He Yi1, Xu Li2, Zou Chuanyun2

Author Affilications：1. Network Information Center, South-West University of Technology and Science, Mianyang 621010, China; 2. Information Engineering School, South-West University of Technology and Science, Mianyang 621010, China

Abstract：The accuracy of the tag pole extraction is affected by many factors, and the pole distribution characteristics of lossless dielectric media materials (thickness, relative permittivity) is analyzed. Using folded dipole array chipless tags as a research object. Simulation results show that the damping coefficient and resonance frequency of resonance pole tend to decrease while the pole distribution performed S-shaped similar curve close to axis origin with the dielectric thickness and relative dielectric constant increases.
Key word：
RFID
chip-less tag
dielectric material
pole characteristic
View(4804)

OFDM signal identification method based on the probability density

Author：Fu Gejia, Duan Tiandong, Liu Ruidong, Xu Wenyan

Author Affilications：Institute of Information System Engineering ,Information Engineering University, Zhengzhou 450002, China

Abstract：To solve the question of OFDM signal blind identification, combined with probability density and HF Watterson channel model,we overcome the shortcoming of not full discussion in real signal kurtosis and sixth-order mixed moments and prove the stability of kurtosis and sixth-order mixed moments in OFDM signal recognition. A new universal high-level mixed moment was proposed. Experimental results testify to the deduction of probability density of various signals proposed in this paper and show that high-order mixed moments not only maintains the merit of low error rate in identifying OFDM signal in HF channel, but also has the advantage of easier threshold setting.
Key word：
OFDM
probability density
kurtosis
mixed moments
signal classification
View(14496)

Computer Technology and Its Applications

Design and implementation of embedded host controller for ITS

Author：Ye Dunfan, Li Yamin, Zhang Mengyan

Author Affilications：Mechanical and Electronic Information Institute, China University of Geosciences, Wuhan 430074, China

Abstract：A design of embedded host controller based on an embedded motherboard for ITS is presented in this paper. Multipath vehicle inspection and multichannel high-definition camera can work at the same time to implement monitoring of multi-lane traffic flow, snapshot when speeding, retrogradation, violation of traffic line. The host controller also has self-protection, self-test, remote control and other function.
Key word：
ITS
embedded motherboard
intelligent transportation
remote control
View(5152)

3G smart and remote vehicle diagnostic system based on QNX

Author：Zhang Rui

Author Affilications：Computer and Information Department of Shangqiu Normal University, Shangqiu 476000 China

Abstract：A program of remote 3G diagnosis system was proposed based on QNX. The hardware real-time system of QNX was used to the vehicle terminal, to capture status information of the vehicle by CAN and GPS module, so as to achieve dynamic feedback to the running status. In order to complete communicates between the car terminal and remote servers, design 3G Wireless layered driver model. As a result , improve the real-time and accuracy of the system. In order to improve the running safety factor, a remote monitoring service center was introduced, so as to check the safe parameter in real-time. Experiments show that, this program can not only capture all the ECU parameter affected the running safety, but also can trace and monitor the vehicle by the remote service center all day.
Key word：
diagnostic system
vehicle terminal
layered driver
service center
View(6138)

The design and implementation of a reusable verification platform based on System Verilog

Author：Shan Rui1, Jiang Lin2, Li Tao1

Author Affilications：1. School of Electronic Engineering, Xi′an University of Posts and Telecommunications, Xi′an 710061, China; 2. School of Graduate, Xi′an University of Posts and Telecommunications, Xi′an 710061, China

Abstract：Design a reusable verification platform with a hierarchical structure employing system verilog language. This verification platform can generate targeted, random, and error test vectors. The platform also facilitates the computing of functional coverage. Running this platform on VCS tools of Synopsys Corporation, meanwhile using it to simulate packet switch chip. The result shows that the functional coverage of chip can achieve 100% through revising restraint condition of random signal and weight value using to generate random signal.
Key word：
System Verilog
verification
hierarchical platform
reusability
View(8850)

The NAT traversal research in the peer-to-peer network linking

Author：Sun Weixi, Xi Shaolong

Author Affilications：Center of Computer Network Engineering Technology, College of Mathematics and Information Science, Weinan Normal University, Weinan 714000, China

Abstract：By combining the ‘holes’ crossing through the cone NAT with the combination of symmetric NAT, we successfully went across all the NAT and solved the Peer-to-Peer networking of the NAT traversal problem. The scheme can go without changing the existing network equipment and ensure the security of the internal network, and it also overcomes the shortage of tradition scheme can only go across some certain types of NAT that currently exist across the way, packet lost, delaying and other shortcomings.
Key word：
P2P
NAT
classification
type detection
traversal
View(6600)

Research on BP-GA mixture algorithm in micro-seismic source inversion

Author：Yu Miao1,2, Chen Zubin1,2, Wang Lianfei1,2

Author Affilications：1. Key Laboratory of Geo-exploration Instrumentation, Ministry of Education, Jilin University, Changchun 130061, China; 2. National Engineering Research Center of Geophysics Exploration Instruments, Changchun 130061, China

Abstract：For the defects of traditional nonlinear inversion methods, such as easy to fall into local optimum resolution and slow rate of convergence, a micro-seismic source positioning inversion method based on BP-GA algorithm has been proposed. The design model and theory of the BP-GA hybrid algorithm is discussed in this paper. It also describes the method of data analysis and processing in Matlab with instances.
Key word：
BP neural network
genetic algorithm
micro-seismic source
inversion
View(7274)

Energy-saving frequency modulation transmitter based on MSP430 MCU

Author：Mao Xiaoli1,2, Yang Bo1，Yang Jingqiu1， Ma Chao1，Zhu Weina1

Author Affilications：1.School of Electronic & Information Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China; 2. Jiangsu Key Laboratory of Meteorological Observation and Information Processing, Nanjing University of Information Science & Technology, Nanjing 210044, China

Abstract：In order to improve the transmission efficiency and reduce system power consumption and unnecessary waste of energy, the design of energy-saving digital FM transmitter with automatically shutting down is discussed. Taking MSP430 MCU as master control and BH1415F as central chip to constitute digital FM transmitter. Using sound intensity detection module and relay switch module to connect or auto disconnect power. The debugging shows that the program is feasible and can play energy saving.
Key word：
MSP430
BH1415
sound intensity measurement
relay control
mute off
View(5736)

The application of the fish to optimize the BP network in cold rolling

Author：Li Ying, Wang Hongrui, Zhang Junlin, Wei Lixin

Author Affilications：Industrial Computer Control Key Laboratory in Hebei Province, Yanshan University Qinhuangdao 066004, China

Abstract：First of all, in the rolling mill hydraulic AGC system and its running mechanism was established on the basis of electric fluid position control system mathematical model. Using the FB Generateror C language etc, the writing and packaging of the optimized network was done, andobtained the neural network intelligent controller based on improved artificial fish algorithm. Created based on neural network intelligent algorithm CFC(continuous function chart) block and in Siemens FM458 platform on the electric liquid control system model experiment. Artificial fish algorithm optimized neural network controller can accurate and fast to control requirements, the method applied in cold rolling mill AGC control effective.
Key word：
cold rolled AGC
neural network
artificial fish swarm algorithm
intelligent controller
View(12906)

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