Pub Date : 2004-09-27DOI: 10.1109/SSST.2004.1295683
P. Jungwirth, A. Poularikas
We present simulations showing the primary distortion in a Sayiner level crossing converter is odd harmonic distortion and examine two methods for improving the performance. A cosine-dither technique is presented. The potential benefits of a hybrid delta sigma level crossing converter are discussed. Nyquist analog-to-digital converters achieve high dynamic range with a large number of quantization levels. Delta sigma oversampling analog-to-digital converters achieve high dynamic range by averaging a large number of coarsely quantized samples together. A zero crossing converter determines the time when the input signal equals a reference signal. A zero crossing converter requires accurate timing to achieve high dynamic range. By combining a small number of quantization levels with zero crossing times, Sayiner's level crossing converter achieves high dynamic range with a fraction of the complexity of a Nyquist converter and requires less accurate timing than a zero crossing converter.
{"title":"Improved Sayiner level crossing ADC","authors":"P. Jungwirth, A. Poularikas","doi":"10.1109/SSST.2004.1295683","DOIUrl":"https://doi.org/10.1109/SSST.2004.1295683","url":null,"abstract":"We present simulations showing the primary distortion in a Sayiner level crossing converter is odd harmonic distortion and examine two methods for improving the performance. A cosine-dither technique is presented. The potential benefits of a hybrid delta sigma level crossing converter are discussed. Nyquist analog-to-digital converters achieve high dynamic range with a large number of quantization levels. Delta sigma oversampling analog-to-digital converters achieve high dynamic range by averaging a large number of coarsely quantized samples together. A zero crossing converter determines the time when the input signal equals a reference signal. A zero crossing converter requires accurate timing to achieve high dynamic range. By combining a small number of quantization levels with zero crossing times, Sayiner's level crossing converter achieves high dynamic range with a fraction of the complexity of a Nyquist converter and requires less accurate timing than a zero crossing converter.","PeriodicalId":309617,"journal":{"name":"Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133761267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-09-27DOI: 10.1109/SSST.2004.1295620
C.D. Johnson
Discrete/continuous (D/C) control is a modern generalization of contemporary "zero-order-hold" (zoh) type discrete-time control. In this paper, a transfer-function formulation of MIMO discrete/continuous controllers and corresponding, exact "D/C-discretized" MIMO plant models is developed. The results allow control designers to analyze and design D/C controllers using exact, discrete-time transfer-functions and classical block-diagram methods.
{"title":"An exact discrete-time transfer-function representation for the analysis and design of discrete/continuous control systems","authors":"C.D. Johnson","doi":"10.1109/SSST.2004.1295620","DOIUrl":"https://doi.org/10.1109/SSST.2004.1295620","url":null,"abstract":"Discrete/continuous (D/C) control is a modern generalization of contemporary \"zero-order-hold\" (zoh) type discrete-time control. In this paper, a transfer-function formulation of MIMO discrete/continuous controllers and corresponding, exact \"D/C-discretized\" MIMO plant models is developed. The results allow control designers to analyze and design D/C controllers using exact, discrete-time transfer-functions and classical block-diagram methods.","PeriodicalId":309617,"journal":{"name":"Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121931226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-09-27DOI: 10.1109/SSST.2004.1295680
C.D. Johnson
Traditionally, the modeling of (i.e., the creation of mathematical models for) dynamic systems has been more of an art than a science. Today, there is a growing-feeling among scholars in the modeling and simulation community that modeling can, and should, be more scientific in nature. In this paper, a set of fundamental hypotheses and scientific principles are proposed as candidate components for the construction of an effective science of modeling for dynamic systems.
{"title":"On a 'science of modeling' for dynamic-systems; some fundamental ideas and principles","authors":"C.D. Johnson","doi":"10.1109/SSST.2004.1295680","DOIUrl":"https://doi.org/10.1109/SSST.2004.1295680","url":null,"abstract":"Traditionally, the modeling of (i.e., the creation of mathematical models for) dynamic systems has been more of an art than a science. Today, there is a growing-feeling among scholars in the modeling and simulation community that modeling can, and should, be more scientific in nature. In this paper, a set of fundamental hypotheses and scientific principles are proposed as candidate components for the construction of an effective science of modeling for dynamic systems.","PeriodicalId":309617,"journal":{"name":"Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128485595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-09-27DOI: 10.1109/SSST.2004.1295705
C. Chandrasekara, A. Davari
An introductory control laboratory is presented. This paper describes our experiences in developing and teaching such a course to seniors in the Electrical and Computer Engineering Department at West Virginia University Institute of Technology (WVU Tech). The course, entitled "Automatic Control Laboratory," is organized around consideration of principles of control systems. The emphasis in the laboratory experiments is on plant identification, open loop and closed loop characteristics, effect of damping and design and implementation of PID control schemes. The topics introduced in the course ELCE 424 Automatic control such as introduction to control systems, time domain analysis, control system characteristics and performance of feedback control, complement the laboratory course.
{"title":"Experiments for the undergraduate control laboratory","authors":"C. Chandrasekara, A. Davari","doi":"10.1109/SSST.2004.1295705","DOIUrl":"https://doi.org/10.1109/SSST.2004.1295705","url":null,"abstract":"An introductory control laboratory is presented. This paper describes our experiences in developing and teaching such a course to seniors in the Electrical and Computer Engineering Department at West Virginia University Institute of Technology (WVU Tech). The course, entitled \"Automatic Control Laboratory,\" is organized around consideration of principles of control systems. The emphasis in the laboratory experiments is on plant identification, open loop and closed loop characteristics, effect of damping and design and implementation of PID control schemes. The topics introduced in the course ELCE 424 Automatic control such as introduction to control systems, time domain analysis, control system characteristics and performance of feedback control, complement the laboratory course.","PeriodicalId":309617,"journal":{"name":"Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120895193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-09-27DOI: 10.1109/SSST.2004.1295621
M. Gheorghiu, Y.D. Song
Neuro-adaptive control algorithms for depth and pitch control of submarine operating in shallow waters are presented in this paper. The control scheme is based on two neural-network (NN) units which are shown to be effective in attenuating the reconstruction error and other lumped system uncertainties. Stable on-line weight-tuning algorithms are derived based on Lyapunov's stability theory. Variable heading speed and changing center of gravity are taken into consideration in control design. Analyses and simulations show that the proposed control is effective in dealing with external disturbances, system nonlinearities, uncertainties and parameter variations.
{"title":"Control of submarine operating in shallow waters: a neuro-adaptive based approach","authors":"M. Gheorghiu, Y.D. Song","doi":"10.1109/SSST.2004.1295621","DOIUrl":"https://doi.org/10.1109/SSST.2004.1295621","url":null,"abstract":"Neuro-adaptive control algorithms for depth and pitch control of submarine operating in shallow waters are presented in this paper. The control scheme is based on two neural-network (NN) units which are shown to be effective in attenuating the reconstruction error and other lumped system uncertainties. Stable on-line weight-tuning algorithms are derived based on Lyapunov's stability theory. Variable heading speed and changing center of gravity are taken into consideration in control design. Analyses and simulations show that the proposed control is effective in dealing with external disturbances, system nonlinearities, uncertainties and parameter variations.","PeriodicalId":309617,"journal":{"name":"Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121680903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-09-27DOI: 10.1109/SSST.2004.1295627
J. C. Kerce, W. Blair, G. Brown
Approximations are derived for the delay and bending of a wavefront propagating through the class of spherically symmetric refractivity profiles which decay exponentially with altitude. These approximations are derived by formulating the quantities of interest in terms of an optimization problem, the solution of which is then estimated for an appropriately chosen candidate path. Based on these approximations, a simple model is introduced to simulate the residual measurement errors remaining after the application of a notional refraction correction algorithm. The application of this model to the simulation of multi-sensor, multi-platform tracking is discussed.
{"title":"Modeling refraction errors for simulation studies of multisensor target tracking","authors":"J. C. Kerce, W. Blair, G. Brown","doi":"10.1109/SSST.2004.1295627","DOIUrl":"https://doi.org/10.1109/SSST.2004.1295627","url":null,"abstract":"Approximations are derived for the delay and bending of a wavefront propagating through the class of spherically symmetric refractivity profiles which decay exponentially with altitude. These approximations are derived by formulating the quantities of interest in terms of an optimization problem, the solution of which is then estimated for an appropriately chosen candidate path. Based on these approximations, a simple model is introduced to simulate the residual measurement errors remaining after the application of a notional refraction correction algorithm. The application of this model to the simulation of multi-sensor, multi-platform tracking is discussed.","PeriodicalId":309617,"journal":{"name":"Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124938829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-09-27DOI: 10.1109/SSST.2004.1295699
Z. Ramadan, A.D. Poularikas
This paper introduces an adaptive noise canceller (ANC) using a proposed variable step size least mean-square (LMS) algorithm. The step size varies between two hard limits based on a predetermined nonlinear decreasing function of signal to noise ratio (SNR) estimated at every iteration of the algorithm. The performance of the proposed algorithm is studied for different power levels of both stationary and nonstationary Gaussian noise added to the original speech. Compared with other several variable step size algorithms, computer simulations show performance superiority of the proposed algorithm in decreasing excess mean square error (EMSE) in both stationary and nonstationary noise environments. Simulations of the proposed method also show substantial improvements in decreasing misadjustment and reverberation.
{"title":"A variable step-size adaptive noise canceller using signal to noise ratio as the controlling factor","authors":"Z. Ramadan, A.D. Poularikas","doi":"10.1109/SSST.2004.1295699","DOIUrl":"https://doi.org/10.1109/SSST.2004.1295699","url":null,"abstract":"This paper introduces an adaptive noise canceller (ANC) using a proposed variable step size least mean-square (LMS) algorithm. The step size varies between two hard limits based on a predetermined nonlinear decreasing function of signal to noise ratio (SNR) estimated at every iteration of the algorithm. The performance of the proposed algorithm is studied for different power levels of both stationary and nonstationary Gaussian noise added to the original speech. Compared with other several variable step size algorithms, computer simulations show performance superiority of the proposed algorithm in decreasing excess mean square error (EMSE) in both stationary and nonstationary noise environments. Simulations of the proposed method also show substantial improvements in decreasing misadjustment and reverberation.","PeriodicalId":309617,"journal":{"name":"Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131103234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-09-27DOI: 10.1109/SSST.2004.1295657
A. Van Reet, M. Feemster
In order to evaluate control strategies for smart exercise systems, an electrically actuated exercise environment is developed. Specifically, a bicep/tricep exercise machine is augmented with a high torque/low speed DC motor for active resistance generation. A QNX based PC platform running the QMotor software serves as the control implementation environment. Details of the various sensors and power electronics are included.
{"title":"Development of an electrically actuated exercise system","authors":"A. Van Reet, M. Feemster","doi":"10.1109/SSST.2004.1295657","DOIUrl":"https://doi.org/10.1109/SSST.2004.1295657","url":null,"abstract":"In order to evaluate control strategies for smart exercise systems, an electrically actuated exercise environment is developed. Specifically, a bicep/tricep exercise machine is augmented with a high torque/low speed DC motor for active resistance generation. A QNX based PC platform running the QMotor software serves as the control implementation environment. Details of the various sensors and power electronics are included.","PeriodicalId":309617,"journal":{"name":"Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132295580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-09-27DOI: 10.1109/SSST.2004.1295631
J. Schindler, H. Steyskal
We investigate moving target detection with a space-based cluster of radar satellites, modeled as a random sparse array. Results show that improvement in signal to interference is a sensitive function of the pulse repetition frequency and varies over a large dynamic range. Achievable improvement factor maxima are moderately degraded by array pitch (satellite cluster rotation) and strongly degraded with increasing position errors. In general, with increased randomness, fewer elements contribute to form DPCA pairs so that satellite usage efficiency and SNR are degraded.
{"title":"Sparse, random array processing for space-based radar","authors":"J. Schindler, H. Steyskal","doi":"10.1109/SSST.2004.1295631","DOIUrl":"https://doi.org/10.1109/SSST.2004.1295631","url":null,"abstract":"We investigate moving target detection with a space-based cluster of radar satellites, modeled as a random sparse array. Results show that improvement in signal to interference is a sensitive function of the pulse repetition frequency and varies over a large dynamic range. Achievable improvement factor maxima are moderately degraded by array pitch (satellite cluster rotation) and strongly degraded with increasing position errors. In general, with increased randomness, fewer elements contribute to form DPCA pairs so that satellite usage efficiency and SNR are degraded.","PeriodicalId":309617,"journal":{"name":"Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134281193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-09-27DOI: 10.1109/SSST.2004.1295611
M. Nalasani, W. D. Pan
Conventional motion estimation algorithms in video coding consider only translations, which can be readily characterized by displacement motion vectors. We might be able to achieve more accurate motion estimation by enlarging the search windows, at the expense of drastically increased computational complexity. Alternatively, we could also increase the accuracy of motion estimation by taking into account potential non-translation motions of objects in a video scene, without increasing the search window size. In this paper, we conduct a comparative study on the computational complexity of these two methods. We demonstrate that our motion estimation method based on the Lie operators can significantly increase the accuracy of motion estimation, while requiring much lower complexity than the method of enlarged search windows.
{"title":"On the complexity and accuracy of motion estimation using Lie operators","authors":"M. Nalasani, W. D. Pan","doi":"10.1109/SSST.2004.1295611","DOIUrl":"https://doi.org/10.1109/SSST.2004.1295611","url":null,"abstract":"Conventional motion estimation algorithms in video coding consider only translations, which can be readily characterized by displacement motion vectors. We might be able to achieve more accurate motion estimation by enlarging the search windows, at the expense of drastically increased computational complexity. Alternatively, we could also increase the accuracy of motion estimation by taking into account potential non-translation motions of objects in a video scene, without increasing the search window size. In this paper, we conduct a comparative study on the computational complexity of these two methods. We demonstrate that our motion estimation method based on the Lie operators can significantly increase the accuracy of motion estimation, while requiring much lower complexity than the method of enlarged search windows.","PeriodicalId":309617,"journal":{"name":"Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114694292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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