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All-digital Carrier Frequency Tracking method in LEO DS/SS Communication

Semiconductor Photonics and Technology 2006年第2期12卷 126-130页

作者： XING Ke-fei YANG Jun ZHANG Chuan-sheng WANG Yue-ke Institute of Electromechanical Engineering and Automation NUDT Changsha 410073 CHN

An efficient method to track the carrier frequency which is recommended to use in low earth orbit(LEO) direct-sequence spread-spectrum(DS/SS) communication system is given. The carrier frequency drifts quicker in LEO DS/SS communication system, its tracking problem becomes much more important especially in digital receiver with the limits of physical shape and power. Under the condition of coarse carrier frequency synchronization, a digital tracking method based on least square method(LSM) is proved to be a quick, simple and efficient method. Numerical results and charts are given.

关键词： Low earth orbit Direct-sequence spread- spectrum Carrier frequency tracking least square method

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Multi-source Information Fusion Based Train On-line Operation Data Monitoring and Analyzing

Multi-source Information Fusion Based Train On-line Operatio...

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第40届中国控制会议

作者： Minjie Zhang Haifeng Song Tao Wang Pengju Sun Hairong Dong School of Electronic and Information Engineering Beijing Jiaotong University Department of Passenger Transport China Railway Shenyang Group Co.Ltd. Institute of Transportation and Economics China Academy of Railway Sciences Group Co.Ltd. State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University

With the rapid development of high-speed trains in the world,how to quickly collect train operation data becomes a significant *** paper uses Global Navigation Satellite System（GNSS）,Inertial Navigation System（INS）,and Driver Machine Interface（DMI） information fusion to obtain the position and speed information of the train more *** these information sources,GNSS and INS can carry out the collection of train position and speed information with and without obstructions,*** the train is running in the open and unobstructed,GNSS can directly obtain train operation *** the train passes through an environment with obstructions,GNSS and INS work simultaneously to obtain train operation *** DMI on the train has the timely speed and kilometer mark information of the *** the measurement,as we can not access to the onboard *** camera is applied to collect the DMI *** image is processed to obtain the train data *** this paper,the train data collected by GNSS/INS equipment is corrected by the Kalman filtering *** data collected by DMI is filtered by the kinematics theorem and the least square *** is more,a centralized fusion structure is used to process the DMI,GNSS,and INS *** result can provide more accurate train time,speed,and kilometer mark information for the train during the operation test.

关键词： train operation information fusion least square method Kalman filtering centralized fusion

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A method for Measurement of Static Lever Arm

A Method for Measurement of Static Lever Arm

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新型导航技术及应用研讨会

作者： Ma Xianglu Qin Shiqiao Wang Xingshu WuWei Hu Feng Zheng JiaXing College of Optoelectronic Science and Engineering National University of Defense Technology Air Force Radar Academy

Lever arm effect has to be considered in transfer alignment technology. Between static lever arm and dynamic lever arm,the former has larger amplitude, and it is the major error source in transfer alignment. How to measure and solve it become an important problem. This paper takes vehicle as a rigid *** that static lever arm doesnot change in a short time, based on two inertial measurement units(IMU), data are measured and constituted several matrixes *** that, by using least square method, static lever arm is solved finally. Simulation experiments are implemented, results show that static lever arm can be solved *** study shows that, the precision of the method can be improved by preprocessing low pass filter.

关键词： inertial navigation lever arm rigid body least square method

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Data-based Parameter Calibration method of the Computed Tomography System

Data-based Parameter Calibration Method of the Computed Tomo...

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第37届中国控制会议

作者： Zhang Ruikun Shan Zhengduo Duan Deyu Xu Guangwei Zhang Xinli School of Mathematics and Physics Qingdao University of Science and Technology Big Data Research Center of School of Mathematics and Physics Qingdao University of Science and Technology Center for Mathematical Modeling Research Qingdao University of Science and Technology

This paper mainly studies data-based parameter calibration of the computed tomography（CT） system. By establishing a least squares algorithm model, CT system parameters were calibrated. First, the attenuation coefficient is calculated from the known data, and the relationship between the received information and the pitch of the X-ray transmission template is obtained by using the Lambert-beers principle. Then, by using the geometric relationship between the ray and the two-dimensional graph, the relationship model between the pitch and the variable to be sought is established. On this basis, we can get the multivariate linear equations which present the received information and the variables to be solved. Finally, the least square method is used to establish the target programming model which is based on the minimum square sum of the fitting value and the actual value of the received information. By using the genetic algorithm, the multiple linear equations are solved. Meanwhile, the deflection center and receiver unit spacing can be obtained.

关键词： Parameter Calibration Data-based CT system least square method Genetic Algorithm

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APPLICATION OF PIEZOELECTRIC IMPEDANCE TECHNOLOGY IN STRUCTURAL DAMAGE DETECTION

APPLICATION OF PIEZOELECTRIC IMPEDANCE TECHNOLOGY IN STRUCTU...

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2006年中国机械工程学会年会暨中国工程院机械与运载工程学部首届年会

作者： ZHANG Jing, ZHANG Zhiwen School of Electronic Information and Automation, Chongqing Institute of Technology, Chongqing, China

Recently, the impedance-based damage detection technique has been developed as a promising tool for real-time structural damage assessments. The basic concept of this method is using the electromechan

关键词： Structural damage detection truss structure piezoelectric impedance response least square method looseness of bolts.

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Design of Intelligent Paper Counting System Based on KNN Algorithm

Design of Intelligent Paper Counting System Based on KNN Alg...

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第32届中国控制与决策会议

作者： Yong Sun Miao Chen Guoming Lin Tianjin University of Technology and Education Key Laboratory of Information Sensing and Intelligent Control

This system is controlled by STM32 single-chip ***2214 capacitance sensor detects different capacitance values between plates,and can accurately detect the number of paper between plates A and *** STM32 F407 ZGT6 microcontroller as the core processor,data processing is carried out through the least square method of fitting the slope,eliminating the influence of parasitic capacitance on the data,improving the detection accuracy,collecting stable data of different paper Numbers between the plates in advance,generating samples and self-training and *** the effective data is collected,the system will find the sample value with the highest similarity of characteristic values through KNN proximity algorithm between the sample data,determine the number of detected papers,and display them on the serial port screen,at the same time,the buzzer will emit sound.

关键词： FDC2214 least square method KNN Neighborhood Algorithm the Paper Counts

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FORECAST OF PORT THROUGHPUT BASED ON SPREADSHEET

FORECAST OF PORT THROUGHPUT BASED ON SPREADSHEET

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2005年中国机械工程学会年会

作者： YANG Shenhua, SHI Chaojian (Merchant Marine College, Shanghai Maritime University, Shanghai, 200135 Navigation Institute, Jimei University, Xiamen, 361021)

＜正＞Forecasting throughput properly is important for port operation and development. Spreadsheet method is an effective method of research and application in management science. For forecasting and testing the throughput of Nantong port with Trend Forecast Technology, we use the model of least mean square fitted by orthogonal functions. Then we perform the modelling and calculation using Spreadsheet. The result indicates that the model fits the historical data properly and is effective to forecast the throughput in the future.

关键词： spreadsheet throughput least square method forecast

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Fast Transient Simulation of Output Voltage for Piezoresistive Microaccelerometers Using Model Order Reduction

Fast Transient Simulation of Output Voltage for Piezoresisti...

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The Seventh China-Japan-Korea Joint Symposium on Optimization of Structural and Mechanical Systems

作者： Ki Beom Kwon Jeong Sam Han Dept.of Mechanical Design Engineering Andong National University760-749AndongKorea

The transient analysis for output voltage of a piezoresistive microaccelerometer takes a relatively high computational cost because at least two iterations are required to calculate the piezoresistive-structural coupled response at each time *** high computational cost for calculating the transient output voltage can be highly reduced by a way of using Krylov-based model order reduction and the least square *** the approach,data on static displacement and output voltage calculated by piezoresistive-structural coupled simulation for three acceleration inputs are used to develop a quadratic regression model relating the output voltage to the displacement at a certain observation *** transient output voltage is then calculated by the regression model using the displacement response cheaply calculated by the reduced-order models.A high-G piezoresistive microaccelerometer with various input accelerations was studied to represent the efficiency and accuracy of the suggested approach.

关键词： Model order reduction Krylov subspace least square method Piezoresistive microaccelerometer

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Dynamic Weighing Technology Combining Parameter Identification

Dynamic Weighing Technology Combining Parameter Identificati...

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第三届国际仪器科学技术学术研讨会

作者： GAO Zong-hai a MAO Jian-dong b aSchool of Mechanical & Instrumental Engineering Xi’an University of Technology Xi’an 710048 China bDepartment of Electronic & Information Engineering The Second Northwest University For Minorities Yinchuan 750021 China

In dynamic weighing system, in order to consider the speed and precision simultaneously when measureing, the problem of dynamic weighing is resolved through parameter identification based on least squ

关键词： dynamic weighing parameter identification Householder transformation least square method

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Research and Application of Flatness Control for Tandem Cold Rolling

Research and Application of Flatness Control for Tandem Cold...

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第37届中国控制会议

作者： LI Xiaogang FANG Yiming LIU Le Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University National Engineering Research Center for Equipment and Technology of Cold Strip Rolling

Compound wave defect occurs in flatness during tandem cold rolling when high-end automobile and household appliance plate are produced, which has several impact on line speed and quality of final product. In this paper, a further research is done on sourcing cause of formation for the flatness defect. In combination with adjusting actuators and automatic flatness control principles, Achieving target flatness by rolls tilting, work rolls bending, middle rolls bending, and section cooling *** control output of tilting, work rolls and middle rolls bending are calculated by the least square method. Section cooling control output of rolling is calculated by the typical fuzzy control theory. The least square method and fuzzy control algorithm are optimized so as to enhance control accuracy of automatic flatness, and at the same time largely improve flatness of steel strip, reduce working strength of operators and improve production efficiency of production line.

关键词： Tandem cold rolling Automatic flatness control least square method Fuzzy control

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