Pub Date : 1996-04-11DOI: 10.1109/SECON.1996.510095
F. D. King, P. Winson, A. Snider, L. Dunleavy, D. Levinson
Conditions numbers expressing the sensitivity of computed circuit element values to inaccuracies in S-parameter measurements are derived and evaluated for a standard small-signal MESFET model. The condition numbers shed light on the common difficulty experienced by transistor modelers in extracting accurate values for the input resistance. Other elements are also classified according to their sensitivity.
{"title":"The condition numbers arising in MESFET parameter extraction","authors":"F. D. King, P. Winson, A. Snider, L. Dunleavy, D. Levinson","doi":"10.1109/SECON.1996.510095","DOIUrl":"https://doi.org/10.1109/SECON.1996.510095","url":null,"abstract":"Conditions numbers expressing the sensitivity of computed circuit element values to inaccuracies in S-parameter measurements are derived and evaluated for a standard small-signal MESFET model. The condition numbers shed light on the common difficulty experienced by transistor modelers in extracting accurate values for the input resistance. Other elements are also classified according to their sensitivity.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128290921","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 : 1996-04-11DOI: 10.1109/SECON.1996.510031
C.W. McKerley
Two degree of freedom seekers are used in many aerospace applications. When designing the control loops for such seekers a planar representation is usually adequate. However when the seeker is modeled in conjunction with an overall system concept, the coupled two degree of freedom equations must be used. In addition seekers are not perfectly balanced and they generally have a center of gravity (CG) offset relative to the gimbal rotation axes. The effects of this imbalance must be modeled to determine just how much CG offset can be allowed. The derivation of the equations of motion for a two degree of freedom coupled seeker with no crossproducts of inertia or mass imbalance has been presented by Cannon (1967). This paper extends this approach to the case of inertia coupling and mass imbalance. A block diagram is also presented representing the math flow diagrams from which the seeker math model may be developed.
{"title":"A model for a two degree of freedom coupled seeker with mass imbalance","authors":"C.W. McKerley","doi":"10.1109/SECON.1996.510031","DOIUrl":"https://doi.org/10.1109/SECON.1996.510031","url":null,"abstract":"Two degree of freedom seekers are used in many aerospace applications. When designing the control loops for such seekers a planar representation is usually adequate. However when the seeker is modeled in conjunction with an overall system concept, the coupled two degree of freedom equations must be used. In addition seekers are not perfectly balanced and they generally have a center of gravity (CG) offset relative to the gimbal rotation axes. The effects of this imbalance must be modeled to determine just how much CG offset can be allowed. The derivation of the equations of motion for a two degree of freedom coupled seeker with no crossproducts of inertia or mass imbalance has been presented by Cannon (1967). This paper extends this approach to the case of inertia coupling and mass imbalance. A block diagram is also presented representing the math flow diagrams from which the seeker math model may be developed.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128561772","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 : 1996-04-11DOI: 10.1109/SECON.1996.510081
Bennamoun, B. Boashash, M. Dunbar
The need to successfully navigate in an underwater environment is rapidly becoming an important concern in the 1990s. This paper presents the development of an integrated navigation system for use by autonomous vehicles (AUV) using GPS, INS and sonar. This paper discusses the existing problems with sub-sea navigation, the motivation for an integrated system, the mathematical derivation for an integrated GPS/INS/sonar system, and the results obtained from extensive testing.
{"title":"The development of an integrated GPS/INS/sonar navigation system","authors":"Bennamoun, B. Boashash, M. Dunbar","doi":"10.1109/SECON.1996.510081","DOIUrl":"https://doi.org/10.1109/SECON.1996.510081","url":null,"abstract":"The need to successfully navigate in an underwater environment is rapidly becoming an important concern in the 1990s. This paper presents the development of an integrated navigation system for use by autonomous vehicles (AUV) using GPS, INS and sonar. This paper discusses the existing problems with sub-sea navigation, the motivation for an integrated system, the mathematical derivation for an integrated GPS/INS/sonar system, and the results obtained from extensive testing.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124525048","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 : 1996-04-11DOI: 10.1109/SECON.1996.510063
Liu Feng, W.J. Ebel
This paper discusses algebraic geometry codes by their construction, parametric properties, and decoding algorithms. Comparisons between algebraic geometry codes and Reed Solomon codes are made to provide a deeper understanding of the algebraic geometry codes. Also, a worked example of algebraic geometry codes is given.
{"title":"Algebraic geometry codes from Reed Solomon codes","authors":"Liu Feng, W.J. Ebel","doi":"10.1109/SECON.1996.510063","DOIUrl":"https://doi.org/10.1109/SECON.1996.510063","url":null,"abstract":"This paper discusses algebraic geometry codes by their construction, parametric properties, and decoding algorithms. Comparisons between algebraic geometry codes and Reed Solomon codes are made to provide a deeper understanding of the algebraic geometry codes. Also, a worked example of algebraic geometry codes is given.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124640312","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 : 1996-04-11DOI: 10.1109/SECON.1996.510166
W.L. Elden
Nearly all engineering and scientific codes of ethics proclaim that the overriding ethical obligation of a professional is to protect the public's safety, welfare and environment. The degree to which an engineer/scientist is capable of exercising this obligation will determine how close the individual really has attained standing in society as a true "professional". The author believes that this goal has not been achieved and that an insidious practice of "ethical harassment" has existed for a long time. Members of the IEEE may request assistance from its Member Conduct Committee or file misconduct complaints against other members when faced with this practice.
{"title":"Curtailment of ethical harassment of engineers","authors":"W.L. Elden","doi":"10.1109/SECON.1996.510166","DOIUrl":"https://doi.org/10.1109/SECON.1996.510166","url":null,"abstract":"Nearly all engineering and scientific codes of ethics proclaim that the overriding ethical obligation of a professional is to protect the public's safety, welfare and environment. The degree to which an engineer/scientist is capable of exercising this obligation will determine how close the individual really has attained standing in society as a true \"professional\". The author believes that this goal has not been achieved and that an insidious practice of \"ethical harassment\" has existed for a long time. Members of the IEEE may request assistance from its Member Conduct Committee or file misconduct complaints against other members when faced with this practice.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124861899","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 : 1996-04-11DOI: 10.1109/SECON.1996.510084
A.H. El Zooghby, S. El Khamy, C. Christodoulou
The problem of increasing the number of users in FDMA mobile satellite communication systems is addressed. An antenna array is used to estimate the AOA of the desired and cochannel mobile users then the same array is used to allocate the maximum of the pattern to desired users while cochannel interference is nulled. This paper describes the use of the MUSIC algorithm for DOA estimation. Pattern nulls are obtained using the Wiener solution for the optimum array weights. It is shown that this approach allows closer proximity of the mobile users with same frequency thus increasing the channel capacity.
{"title":"Adaptive antenna arrays for mobile satellite communications","authors":"A.H. El Zooghby, S. El Khamy, C. Christodoulou","doi":"10.1109/SECON.1996.510084","DOIUrl":"https://doi.org/10.1109/SECON.1996.510084","url":null,"abstract":"The problem of increasing the number of users in FDMA mobile satellite communication systems is addressed. An antenna array is used to estimate the AOA of the desired and cochannel mobile users then the same array is used to allocate the maximum of the pattern to desired users while cochannel interference is nulled. This paper describes the use of the MUSIC algorithm for DOA estimation. Pattern nulls are obtained using the Wiener solution for the optimum array weights. It is shown that this approach allows closer proximity of the mobile users with same frequency thus increasing the channel capacity.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"70 1-4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120908813","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 : 1996-04-11DOI: 10.1109/SECON.1996.510149
M. Malek, P. Chillakanti, S. A. Shaikh, A. Sinha
Extracting instruction level parallelism is a key issue in superscalar architecture. We propose a graph theoretic model to identify parallelism in a sequence of instructions. The system graph model (SGM), presented, is a fundamental source of information regarding the resource dependencies, intra-instruction and inter-instruction parallelism, and the cost-performance of the architecture. Additionally, we propose a new technique called hierarchical identification of parallelism (HIP), which is a systematic approach to identify parallelism. Using this technique, an optimizing compiler can obtain a better static schedule of the assembly level instructions. For better understanding of the techniques developed, we have presented a case study of Hewlett-Packard's PA-RISC microprocessor. Finally, we discuss potential application of the proposed graph model in architectural level testing.
{"title":"Graph modeling of parallelism in superscalar architecture-a case study of HP PA-RISC microprocessor","authors":"M. Malek, P. Chillakanti, S. A. Shaikh, A. Sinha","doi":"10.1109/SECON.1996.510149","DOIUrl":"https://doi.org/10.1109/SECON.1996.510149","url":null,"abstract":"Extracting instruction level parallelism is a key issue in superscalar architecture. We propose a graph theoretic model to identify parallelism in a sequence of instructions. The system graph model (SGM), presented, is a fundamental source of information regarding the resource dependencies, intra-instruction and inter-instruction parallelism, and the cost-performance of the architecture. Additionally, we propose a new technique called hierarchical identification of parallelism (HIP), which is a systematic approach to identify parallelism. Using this technique, an optimizing compiler can obtain a better static schedule of the assembly level instructions. For better understanding of the techniques developed, we have presented a case study of Hewlett-Packard's PA-RISC microprocessor. Finally, we discuss potential application of the proposed graph model in architectural level testing.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126557264","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 : 1996-04-11DOI: 10.1109/SECON.1996.510024
K. Anbumani, V. Malarvizhi
Design of a real-time patient management system that monitors both ECG and blood pressure is discussed. A detailed procedure is given for the object-oriented design of the system.
讨论了一种同时监测心电图和血压的实时病人管理系统的设计。给出了系统面向对象设计的详细步骤。
{"title":"Object-oriented real-time system design of patient management system","authors":"K. Anbumani, V. Malarvizhi","doi":"10.1109/SECON.1996.510024","DOIUrl":"https://doi.org/10.1109/SECON.1996.510024","url":null,"abstract":"Design of a real-time patient management system that monitors both ECG and blood pressure is discussed. A detailed procedure is given for the object-oriented design of the system.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121530767","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 : 1996-04-11DOI: 10.1109/SECON.1996.510109
T.C. Liau, W. K. Tsai
An LMS-like fast algorithm, called the orthogonal LMS (OLMS) algorithm, is proposed. The OLMS algorithm is capable of estimating an FIR system. The estimation error will drop below the noise floor with the number of iterations in about two times the number of taps in the FIR system. This algorithm was designed originally to train the echo cancellers for the voiceband modems. The main feature of OLMS is that it uses an orthogonal training sequence and by exploiting the orthogonality, it accomplishes the exact same computations of the RLS algorithm. A simplified version of OLMS, called the SOLMS algorithm, is shown to be a normalized LMS algorithm with an orthogonal sequence. SOLMS has exactly the computation complexity of the LMS algorithm while converging at a speed compatible to the RLS algorithm. The steady-state error of the SOLMS is almost the same as that of the RLS algorithm. This difference in error actually goes to zero as the channel length goes to infinity. On the other hand, OLMS, which requires 50% more memory than SOLMS while being only slightly more complex than SOLMS, is shown to be exactly equivalent to the RLS algorithm. Using a deterministic linear algebraic formulation of the system identification problem of FIR systems, new insights about LMS-like algorithms and their relationship with the RLS algorithms are obtained. According to the linear algebraic framework, the LMS-like algorithms are shown to be based on the under-determined system approach, while the RLS algorithm is based on the over-determined system approach and these two approaches become the same when the training sequence is orthogonal or when the system is actually exactly determined. Numerical implementation results are provided to demonstrate the theoretical results presented in this paper.
{"title":"Orthogonal LMS algorithms for fast line echo canceller training","authors":"T.C. Liau, W. K. Tsai","doi":"10.1109/SECON.1996.510109","DOIUrl":"https://doi.org/10.1109/SECON.1996.510109","url":null,"abstract":"An LMS-like fast algorithm, called the orthogonal LMS (OLMS) algorithm, is proposed. The OLMS algorithm is capable of estimating an FIR system. The estimation error will drop below the noise floor with the number of iterations in about two times the number of taps in the FIR system. This algorithm was designed originally to train the echo cancellers for the voiceband modems. The main feature of OLMS is that it uses an orthogonal training sequence and by exploiting the orthogonality, it accomplishes the exact same computations of the RLS algorithm. A simplified version of OLMS, called the SOLMS algorithm, is shown to be a normalized LMS algorithm with an orthogonal sequence. SOLMS has exactly the computation complexity of the LMS algorithm while converging at a speed compatible to the RLS algorithm. The steady-state error of the SOLMS is almost the same as that of the RLS algorithm. This difference in error actually goes to zero as the channel length goes to infinity. On the other hand, OLMS, which requires 50% more memory than SOLMS while being only slightly more complex than SOLMS, is shown to be exactly equivalent to the RLS algorithm. Using a deterministic linear algebraic formulation of the system identification problem of FIR systems, new insights about LMS-like algorithms and their relationship with the RLS algorithms are obtained. According to the linear algebraic framework, the LMS-like algorithms are shown to be based on the under-determined system approach, while the RLS algorithm is based on the over-determined system approach and these two approaches become the same when the training sequence is orthogonal or when the system is actually exactly determined. Numerical implementation results are provided to demonstrate the theoretical results presented in this paper.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129146812","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 : 1996-04-11DOI: 10.1109/SECON.1996.510124
S. Zein-Sabatto, O. Omitowoju, W. Hwang
To enhance the performance of intelligent control systems, an automated, online procedure for observing changes in the dynamics of the controlled plant is needed. An interesting approach is the use of neural networks. A methodology using a neural network for failure detection and accommodation is presented. The main idea is to constantly monitor system output for off-nominal behavior (failures) and to use this information to generate an appropriate control action. A two-layer neural network is trained on input-output data pairs generated by simulating the system behavior in different failure modes. An integrated intelligent control system combining the controlled plant, a controller, a trained neural network for failure detection, a vector matching mechanism, and a neural network for failure accommodation is constructed. The vector matching mechanism cross correlates the output of the controlled plant with those of trained neural networks, and reports its decision about the system condition to a neuro-designer. The neuro-designer assesses the system dynamics and generates proper controller coefficients suitable for the current plant dynamics. The computed controller coefficients are continuously downloaded from the neuro-designer to the controller to ensure a stable operating mode and accommodate failures in the plant as they occur. A preliminary simulation result, conducted on the control of an airplane, showed that the intelligent controller is able to maintain system stability even in cases of harsh failures in a tilt-rotor airplane.
{"title":"An intelligent neuro-system for failure detection and accommodation","authors":"S. Zein-Sabatto, O. Omitowoju, W. Hwang","doi":"10.1109/SECON.1996.510124","DOIUrl":"https://doi.org/10.1109/SECON.1996.510124","url":null,"abstract":"To enhance the performance of intelligent control systems, an automated, online procedure for observing changes in the dynamics of the controlled plant is needed. An interesting approach is the use of neural networks. A methodology using a neural network for failure detection and accommodation is presented. The main idea is to constantly monitor system output for off-nominal behavior (failures) and to use this information to generate an appropriate control action. A two-layer neural network is trained on input-output data pairs generated by simulating the system behavior in different failure modes. An integrated intelligent control system combining the controlled plant, a controller, a trained neural network for failure detection, a vector matching mechanism, and a neural network for failure accommodation is constructed. The vector matching mechanism cross correlates the output of the controlled plant with those of trained neural networks, and reports its decision about the system condition to a neuro-designer. The neuro-designer assesses the system dynamics and generates proper controller coefficients suitable for the current plant dynamics. The computed controller coefficients are continuously downloaded from the neuro-designer to the controller to ensure a stable operating mode and accommodate failures in the plant as they occur. A preliminary simulation result, conducted on the control of an airplane, showed that the intelligent controller is able to maintain system stability even in cases of harsh failures in a tilt-rotor airplane.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133689809","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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