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17th International Scientific and Technical Conference on Optical Technologies for Telecommuncations

作者： Diyazitdinov, Rinat R. Povolzhskiy State Univ Telecommun & Informat PSUT Dept Commun Syst 23 Tolstoy St Samara 443010 Russia

ISBN: (纸本)9781510638402;9781510638396

This article was described the task offset and rotate measurement for video signal superposition. The developed algorithm is generalization of Lucas-Kanade model. Another name of this model is optical flow algorithm. The original algorithm allows to rate offsets parameters, but developed algorithm also allows to rate rotate angle. The concept of superposition has based on Taylor series of signal and sinus and cosines replacement on approximate function.

关键词： multidimensional optical video signals video signal superposition offset and rotate measurement optical flow full-scan algorithm correlation algorithm Lucas-Kanade's algorithm

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A Measuring Method for Angular Displacement Based on correlation algorithm

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JOURNAL OF COMPUTERS 2012年第10期7卷 2376-2382页

作者： Yan, Ping He, Yan Yi, Runzhong Liu, Fei Chen, Guorong Chongqing Univ State Key Lab Mech Transmiss Chongqing Peoples R China Chongqing Univ Sci & Technol Sch Elect & Informat Engn Chongqing Peoples R China

The existing angular displacement measurement methods rely on the manufacturing precision of the fixed-plate and moving-plate with high manufacturing cost, and it is difficult to overcome a static error and drift for the static measurement method. A kind of angular displacement measuring method based on correlation algorithm is presented with the characteristics of a low manufacturing cost, high precision, anti-noise and anti-partially damaged properties and so on. The method is that firstly full circle broadband or white noise, random data is a pre-prepared coaxially in a rotating body, then the periodic random signal is continuously formed using pickup head reads this data in the basic uniform rotation process of the rotating body. The instantaneous angular displacement of the pickup head relative to the rotating body is obtained by means of the correlation operations between the periodic random signal and the signal sequence of pre-stored data. The angular displacement among the different pickup heads is gained by subtraction for the instantaneous angular displacement of different pickup heads relative to the rotating body at the same instant. The functional relationship between the relative angular displacement of the different pickup heads and the measured angular displacement is determined by linkage equations, which is used to calculate the measured angular displacement. Furthermore, the schematics of detective devices and the principle of the signal processing are developed to implement the method.

关键词： angular disposition signal processing correlation algorithm measurement

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Error Analysis for correlation algorithm Based Servo Valve Frequency Characteristic Measurement

Error Analysis for Correlation Algorithm Based Servo Valve F...

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4th International Conference on Measuring Technology and Mechatronics Automation (ICMTMA 2012)

作者： Chang, Huayao Wang, Junzheng Zhao, Jiangbo Wang, Shoukun Beijing Inst Technol Sch Automat Beijing 100081 Peoples R China

ISBN: (纸本)9783037852842

A fault diagnosis based on bond graph model is proposed for hydraulic variable pitch system. Because the knowledge representation of bond graph model can provide information of cause and effect between components, a bond graph model of hydraulic variable pitch system is given above rated wind speed. A fault tree, using cause and effect analysis by back propagation, is developed. Qualitative value of parameters is assigned and the fault source is detected by analyzing boundary parameters of fault tree. Comparing with quantitative fault diagnosis based on model, the bond graph fault diagnosis is more flexible and has good completeness.

关键词： correlation algorithm error analysis frequency characteristic

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Digital Approach to Rotational Speed Measurement Using an Electrostatic Sensor

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SENSORS 2019年第11期19卷 2540.-2540.页

作者： Li, Lin Hu, Hongli Qin, Yong Tang, Kaihao Xi An Jiao Tong Univ State Key Lab Power Equipment & Elect Insulat Xian 710049 Shaanxi Peoples R China Beijing Jiaotong Univ State Key Lab Rail Traff Control & Safety Beijing 100044 Peoples R China

In industrial production processes, rotational speed is a key parameter for equipment condition monitoring and fault diagnosis. To achieve rotational speed measurement of rotational equipment under a condition of high temperature and heavy dust, this article proposes a digital approach using an electrostatic sensor. The proposed method utilizes a strip of a predetermined material stuck on the rotational shaft which will accumulate a charge because of the relative motion with the air. Then an electrostatic sensor mounted near the strip is employed to obtain the fluctuating signal related to the rotation of the charged strip. Via a signal conversion circuit, a square wave, the frequency of which equals that of the rotation shaft can be obtained. Having the square wave, the M/T method and T method are adopted to work out the rotational speed. Experiments were conducted on a laboratory-scale test rig to compare the proposed method with the auto-correlation method. The largest relative errors of the auto-correlation method with the sampling rate of 2 ksps, 5 ksps are 3.2% and 1.3%, respectively. The relative errors using digital approaches are both within +/- 4 parts per thousand. The linearity of the digital approach combined with the M/T method or T method is also superior to that of the auto-correlation method. The performance of the standard deviations and response speed was also compared and analyzed to show the priority of the digital approach.

关键词： electrostatic sensor digital approach rotational speed correlation algorithm

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Satellite Network Resource Association Analysis and Collaborative Optimization Method

Satellite Network Resource Association Analysis and Collabor...

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作者： Debin Wei Junpeng Zhang Li Yang Chengsheng Pan Dalian University Nanjing University of Science & Technology

With the continuous development of satellites,the number and types of satellites continue to grow,people are increasingly demanding satellites,and the demand for satellite networks is *** to the wide coverage of the satellite,the long distance from the ground,the high dynamics,and many types,the difficulty of satellite network resource management is increased,resulting in a series of problems such as improper resource management and idle resources in the satellite *** view of the above problems,this paper firstly uses the coarse-grained method to classify the satellite network’s multi-dimensional resources and uses the characteristic parameters of the resource elements to perform fine-grained characterization and analysis of the satellite network resources;then,because the single resource element can’t meet the needs of various tasks of the satellite network,a multi-dimensional resource element association algorithm for satellite networks is proposed;finally,for the multi-dimensional resource collaborative optimization problem,a resource conversion strategy is pro proposed to solve the problem of resource shortage in satellite network *** simulation verification,the resource conversion strategy is better than the traditional method under the shortage of satellite network communication resources.

关键词： Satellite network resource management characterization analysis correlation algorithm resource conversion

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Comparison of correlation algorithms with Correlating Shack-Hartmann Wave-front Images 2

Comparison of Correlation Algorithms with Correlating Shack-...

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Conference on Real-Time Photonic Measurements, Data Management, and Processing II

作者： Zhou, Hangcheng Zhang, Lanqiang Zhu, Lei Bao, Hua Guo, Youming Rao, Xuejun Zhong, Libo Rao, Changhui Chinese Acad Sci Key Lab Adapt Opt POB 350 Chengdu 610209 Sichuan Peoples R China Chinese Acad Sci Inst Opt & Elect Lab Adapt Opt POB 350 Chengdu 610209 Sichuan Peoples R China Univ Chinese Acad Sci 19A Yuquan Rd Beijing 100049 Peoples R China

ISBN: (纸本)9781510604711;9781510604728

Correlating Shack-Hartmann wavefront sensor is widely used in solar adaptive optics in which the relative shift between different subapertures by correlation algorithm is computed, and then the control voltage by wavefront reconstruction can be estimated to use for correcting the wavefront distortion induced by atmospheric turbulence. In this paper, several different correlation algorithms including Cross-correlation Coefficient, Absolute Difference Function, Absolute Difference Function-Squared and Square Difference Function are used to estimate relative shift in correlating Shack-Hartmann wave-front sensor with the different observed solar structure such as sunspot, solar pore and solar granulation. The measurement noise RMS error is computed to compare the performance of the correlation algorithms. The results show the correlation algorithm precision is directly related to the solar structure. The measurement noise is relatively small with the relatively high contrast target, and vice versa. At the same time, the size of reference image also could influence the measurement noise, the larger size of the reference image, the smaller the measurement noise is.

关键词： Solar Adaptive Optics Correlating Shack-Hartmann Waver-front Sensor correlation algorithm Noise

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A novel track correlation algorithm for radar data fusion

A novel track correlation algorithm for radar data fusion

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7th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM)

作者： Wu, ZeMin PLAUST Inst Commun Engn Nanjing Jiangsu Peoples R China

ISBN: (纸本)9781424462520

In this paper, a novel topology sequence calculation method is proposed and applied to track correlation algorithm. Based on attribute of topology sequence, tracks from different sensors will be same when there are no errors in sensor's measurement. In order to recognize track from blurred measurement, hypothesis verification is used. Detailed experimental results on such correlation algorithm confirm that topology sequence is robust to range and angle error of sensor measurement, not only including random error, but also including system error.

关键词： correlation Detectors Noise Radar tracking Topology blurred measurement correlation algorithm correlation methods hypothesis verification radar data fusion radar signal processing sensor fusion sensor measurement topology sequence topology sequence calculation method track correlation algorithm

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Method of Face Recognition with the Use of Scalar Perturbation Functions and a Set-Theoretic Operation of Subtraction

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OPTOELECTRONICS INSTRUMENTATION AND DATA PROCESSING 2016年第1期52卷 43-48页

作者： Vyatkin, S. I. Russian Acad Sci Siberian Branch Inst Automat & Electrometry Pr Akad Koptyuga 1 Novosibirsk 630090 Russia

The problem of face recognition is discussed. For this purpose, a method based on scalar perturbation functions and a set-theoretic operation of subtraction is proposed. It is shown that all surface points and the mas... 详细信息

关键词： stereo pair depth map correlation algorithm perturbation functions operation of subtraction voxelization

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Fingerprinting Web Browser for Tracing Anonymous Web Attackers 1

Fingerprinting Web Browser for Tracing Anonymous Web Attacke...

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1st IEEE International Conference on Data Science in Cyberspace (DSC)

作者： Liu, Xiaofeng Liu, Qixu Wang, Xiaoxi Jia, Zhaopeng Chinese Acad Sci Inst Comp Technol Beijing Peoples R China Chinese Acad Sci Inst Informat Engn Beijing Peoples R China Beijing Univ Technol Beijing Peoples R China Beijing Univ Posts & Telecommun Beijing Peoples R China

ISBN: (纸本)9781509011926

As web attackers hide themselves by using multistep springboard (e.g., VPN, encrypted proxy) or anonymous network (i.e. Tor network), it raises a big obstacle for traceability and forensics. Furthermore, traditional forensics methods based on traffic and log analysis are just useful for analyzing attack events but useless for fingerprinting an attacker. Because of this, the browser fingerprinting technique which makes use of slight differences among different browsers was come up with. However, although this technique is effective for tracing attackers, countermeasures have been proposed, such as blocking extensions, spoofing extensions and Blink (a dynamic reconfiguration tool). These countermeasures will lead to changes of fingerprints. To solve the instability of browser fingerprints, we present an enhanced solution aiming at tracing attackers continuously even if the fingerprint changes within a particular period of time. By introducing secondary attributes, employing browser storage mechanisms and designing correlation algorithms, we implement the prototype system to examine the accuracy of our approach. Experimental results show that our proposed solution has the ability to associate different fingerprints from a single platform and the accuracy of tracing anonymous web attackers increases by 24.5% than traditional fingerprinting techniques.

关键词： fingerprint tracing correlation algorithm

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A Novel Range Profile Synthesis Method for Random Hopping Frequency Radar

A Novel Range Profile Synthesis Method for Random Hopping Fr...

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IEEE International Conference on Digital Signal Processing (DSP)

作者： Liao, Zhikun Lu, Dawei Hu, Jiemin Zhang, Jun Natl Univ Def Technol ATR Lab Changsha 410073 Hunan Peoples R China

ISBN: (纸本)9781509041657

A random distribution over the bandwidth makes the random hopping frequency radar widely use in the synthetic wideband application as stepped-frequency radar. However, the traditional inverse fast Fourier transform is not able to achieve range compression due to the random modulation. In this paper, firstly, the echo of the random hopping frequency radar is derived, and an efficient range imaging method is proposed. Then, the range-velocity ambiguity function of random hopping frequency radar using correlation algorithm is depicted to reveal the coupling interrelationship of the range and Doppler. At last, Monte Carlo simulations are carried on to estimate the relation between side-lobe level and the number of frequencies. At the same time, the theoretical prediction formula provides a solid proof for it.

关键词： random hopping frequency radar correlation algorithm ambiguity function Monte Carlo simulations

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