Pub Date : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627603
Lin Huang, W. Jing
This paper presents a method to remove effects of remanent disturbance torque. For some small satellites, a considerable magnetic dipole moment still remains after degaussing, thus the remanent torque becomes one of the main disturbance torques that limit their pointing accuracy. Firstly, an attitude extended Kalman filter is developed to estimate magnetometer bias. Secondly, a dipole field model is used to evaluate the remanent dipole moment. Thirdly, the initial control dipole moment yielded using the optimal distribution law is distracted by the estimated remanent dipole. Finally, the corrected magnetic control dipole interacts with geomagnetic field to associate a momentum-biased wheel to control attitude of satellite. The simulations show that the present method has removed effects of remanent disturbance torque to some extent and in turn improved three-axis attitude control accuracy
{"title":"Correction of remanent disturbance torque","authors":"Lin Huang, W. Jing","doi":"10.1109/ISSCAA.2006.1627603","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627603","url":null,"abstract":"This paper presents a method to remove effects of remanent disturbance torque. For some small satellites, a considerable magnetic dipole moment still remains after degaussing, thus the remanent torque becomes one of the main disturbance torques that limit their pointing accuracy. Firstly, an attitude extended Kalman filter is developed to estimate magnetometer bias. Secondly, a dipole field model is used to evaluate the remanent dipole moment. Thirdly, the initial control dipole moment yielded using the optimal distribution law is distracted by the estimated remanent dipole. Finally, the corrected magnetic control dipole interacts with geomagnetic field to associate a momentum-biased wheel to control attitude of satellite. The simulations show that the present method has removed effects of remanent disturbance torque to some extent and in turn improved three-axis attitude control accuracy","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129516212","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 : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627622
Xijun Chen, Ren Li, Zhen-fan Tan
Method of identifying the dynamic model of accelerometer on precision centrifuge is studied in this paper. Through the method of improved Levy's identification, using only the accelerometer magnitude frequency response data, the accelerometer's dynamic mathematical model can be identified expressed in transfer function. The practicability and effectiveness of the method is illustrated by means of experiment
{"title":"Study on the frequency domain identify method to the accelerometer dynamic model on a centrifuge","authors":"Xijun Chen, Ren Li, Zhen-fan Tan","doi":"10.1109/ISSCAA.2006.1627622","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627622","url":null,"abstract":"Method of identifying the dynamic model of accelerometer on precision centrifuge is studied in this paper. Through the method of improved Levy's identification, using only the accelerometer magnitude frequency response data, the accelerometer's dynamic mathematical model can be identified expressed in transfer function. The practicability and effectiveness of the method is illustrated by means of experiment","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129829297","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 : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627630
Huijun Gao, Tongwen Chen
This paper investigates the problem of stabilization for a Takagi-Sugeno (T-S) fuzzy system with nonuniform uncertain sampling. The sampling is not required to be periodic, and the only assumption is that the distance between any two consecutive sampling instants is less than a given bound. By using the input delay approach, the T-S fuzzy system with variable uncertain sampling is transformed into a continuous-time T-S fuzzy system with a delay in the state. A new condition guaranteeing asymptotic stability of the closed-loop sampled-data system is derived by a Lyapunov approach plus the free weighting matrix technique. Based on this stability condition, two procedures for designing state-feedback control laws are given: one casts the controller design into a convex optimization by introducing some over design, and the other utilizes the cone complementarity linearization (CCL) idea to cast the controller design into a sequential minimization problem subject to linear matrix inequality (LMI) constraints, which can be readily solved using standard numerical software
{"title":"Stabilization of sampled-data T-S fuzzy systems","authors":"Huijun Gao, Tongwen Chen","doi":"10.1109/ISSCAA.2006.1627630","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627630","url":null,"abstract":"This paper investigates the problem of stabilization for a Takagi-Sugeno (T-S) fuzzy system with nonuniform uncertain sampling. The sampling is not required to be periodic, and the only assumption is that the distance between any two consecutive sampling instants is less than a given bound. By using the input delay approach, the T-S fuzzy system with variable uncertain sampling is transformed into a continuous-time T-S fuzzy system with a delay in the state. A new condition guaranteeing asymptotic stability of the closed-loop sampled-data system is derived by a Lyapunov approach plus the free weighting matrix technique. Based on this stability condition, two procedures for designing state-feedback control laws are given: one casts the controller design into a convex optimization by introducing some over design, and the other utilizes the cone complementarity linearization (CCL) idea to cast the controller design into a sequential minimization problem subject to linear matrix inequality (LMI) constraints, which can be readily solved using standard numerical software","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128433168","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 : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627701
N. Phaisal-atsawasenee, R. Suleesathira
Beamspace MUSIC (multiple signal classification) of forward-backward spatial smoothing are used to estimate the directions of coherent arrivals. Coherence are often encountered in sonar, radar, or mobile communications. Such combination can be degraded when the source signals become coherent or strongly correlated. In this paper, we improve angular resolution of beamspace MUSIC by using the forward-backward averaging of a combined signal eigenvectors. The sample covariance matrix computed from the forward-backward spatial smoothing is exploited for an eigen-decomposition. The decorrelation performance of the proposed method is compared to the several methods based on MUSIC and on beamspace MUSIC, in terms of directions of arrival (DOA) estimations, MSEs versus (1) correlation, (2) noise variance and (3) SNRs, probability of resolution to separate closely spaced DOAs
{"title":"Improved angular resolution of beamspace MUSIC for finding directions of coherent sources","authors":"N. Phaisal-atsawasenee, R. Suleesathira","doi":"10.1109/ISSCAA.2006.1627701","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627701","url":null,"abstract":"Beamspace MUSIC (multiple signal classification) of forward-backward spatial smoothing are used to estimate the directions of coherent arrivals. Coherence are often encountered in sonar, radar, or mobile communications. Such combination can be degraded when the source signals become coherent or strongly correlated. In this paper, we improve angular resolution of beamspace MUSIC by using the forward-backward averaging of a combined signal eigenvectors. The sample covariance matrix computed from the forward-backward spatial smoothing is exploited for an eigen-decomposition. The decorrelation performance of the proposed method is compared to the several methods based on MUSIC and on beamspace MUSIC, in terms of directions of arrival (DOA) estimations, MSEs versus (1) correlation, (2) noise variance and (3) SNRs, probability of resolution to separate closely spaced DOAs","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128369647","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 : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627657
B. Song, G. Ma, Chuanjiang Li
The main problem addressed is attitude regulation of a rigid spacecraft with inertia parameter uncertainty, control input saturation and external disturbances. A robust fuzzy attitude control scheme is presented. The parallel distributed compensation (PDC) is applied to design the robust fuzzy controller, which guarantees robust stability of the close-loop system with respect to parametric uncertainty and bounded L2-gain performance with respect to disturbances. Both robust stability and L2-gain performance, together with input constraint, are incorporated in the linear matrix inequality (LMI) conditions. The feedback gains are obtained by the convex optimization technique based on LMI. Simulation results are included to demonstrate the effectiveness of the approach
{"title":"Robust fuzzy controller design for a rigid spacecraft attitude regulation system","authors":"B. Song, G. Ma, Chuanjiang Li","doi":"10.1109/ISSCAA.2006.1627657","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627657","url":null,"abstract":"The main problem addressed is attitude regulation of a rigid spacecraft with inertia parameter uncertainty, control input saturation and external disturbances. A robust fuzzy attitude control scheme is presented. The parallel distributed compensation (PDC) is applied to design the robust fuzzy controller, which guarantees robust stability of the close-loop system with respect to parametric uncertainty and bounded L2-gain performance with respect to disturbances. Both robust stability and L2-gain performance, together with input constraint, are incorporated in the linear matrix inequality (LMI) conditions. The feedback gains are obtained by the convex optimization technique based on LMI. Simulation results are included to demonstrate the effectiveness of the approach","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130631182","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 : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627551
P. Long, Xiaotong Zhang, Qin Wang
Ranging is a fundamental issue in the DOCSIS-based HFC networks, because RTD (round trip delay) between the CM and the CMTS must be dynamically measured and ascertained through ranging schemes. This paper mainly researches the DOCSIS MAC ranging schemes in HFC networks, and proposes a solution to the CM initial ranging in the embedded environment. The design has been successfully applied to a bidirectional communication platform for HDTV, which contains a PHY ASIC chip and an ARM embedded kernel chip. The experimental results have shown that the presented solution can rapidly execute the initial ranging process with high accuracy, and provide fine performance as well as high reliability in various applications
{"title":"Ranging schemes in HFC networks and its embedded implementation","authors":"P. Long, Xiaotong Zhang, Qin Wang","doi":"10.1109/ISSCAA.2006.1627551","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627551","url":null,"abstract":"Ranging is a fundamental issue in the DOCSIS-based HFC networks, because RTD (round trip delay) between the CM and the CMTS must be dynamically measured and ascertained through ranging schemes. This paper mainly researches the DOCSIS MAC ranging schemes in HFC networks, and proposes a solution to the CM initial ranging in the embedded environment. The design has been successfully applied to a bidirectional communication platform for HDTV, which contains a PHY ASIC chip and an ARM embedded kernel chip. The experimental results have shown that the presented solution can rapidly execute the initial ranging process with high accuracy, and provide fine performance as well as high reliability in various applications","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123982087","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 : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627666
Zhonghai Li, Yibo Li, Wenchuan Zhao
The design method of a kind of adaptive filters with human visual sensitivity is proposed. By analyzing on the character of human visual, we take three features of human visual sensitivity to be considered. It is shown that the algorithm is adaptive. The most of the common filters, such as mean filter, are improved into adaptive filters. It constructs simply the coefficient matrices of filters on line and combines with common filters to attain the adaptive filters in the time domain. It decreases the contradiction between reducing the noise in images and preserving the significant features. The coefficient for visual sensitivity is obtained before filtering, so it can be integrated with some other common filters to get new filters with human visual sensitivity
{"title":"Design of an adaptive human visual filter","authors":"Zhonghai Li, Yibo Li, Wenchuan Zhao","doi":"10.1109/ISSCAA.2006.1627666","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627666","url":null,"abstract":"The design method of a kind of adaptive filters with human visual sensitivity is proposed. By analyzing on the character of human visual, we take three features of human visual sensitivity to be considered. It is shown that the algorithm is adaptive. The most of the common filters, such as mean filter, are improved into adaptive filters. It constructs simply the coefficient matrices of filters on line and combines with common filters to attain the adaptive filters in the time domain. It decreases the contradiction between reducing the noise in images and preserving the significant features. The coefficient for visual sensitivity is obtained before filtering, so it can be integrated with some other common filters to get new filters with human visual sensitivity","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121383029","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 : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627443
A. Esmaeli, Yaxiu Sun, Li Sun
Mitigation of the adverse effects of PWM inverter through active filter technique is discussed in this paper. A PWM inverter fed ac motor drive system capable of suppressing all the adverse effects of PWM inverter based on active cancellation method is developed. An active EMI filter proposed for this system is characterized by sophisticated connection of two small separate filters, which they can mitigate common mode voltages produced by PWM inverter and can suppress leakage current. As a result small active filter with ability of reducing of all the adverse effects is approached. Whole system is modeled and simulated based on SABER simulator. Simulations are verified by experimental results, which show the reduction characteristics of the shaft voltage, bearing current, common mode current, and leakage current
{"title":"Mitigation of the adverse effects of PWM inverter through active filter technique","authors":"A. Esmaeli, Yaxiu Sun, Li Sun","doi":"10.1109/ISSCAA.2006.1627443","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627443","url":null,"abstract":"Mitigation of the adverse effects of PWM inverter through active filter technique is discussed in this paper. A PWM inverter fed ac motor drive system capable of suppressing all the adverse effects of PWM inverter based on active cancellation method is developed. An active EMI filter proposed for this system is characterized by sophisticated connection of two small separate filters, which they can mitigate common mode voltages produced by PWM inverter and can suppress leakage current. As a result small active filter with ability of reducing of all the adverse effects is approached. Whole system is modeled and simulated based on SABER simulator. Simulations are verified by experimental results, which show the reduction characteristics of the shaft voltage, bearing current, common mode current, and leakage current","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"189 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114202234","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 : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627513
G. Chen, Yize Sun
This paper proposed a novel approach for part locating design. A fixture feature recognition algorithm is presented. With the algorithm, the fixture feature could be extracted from 3D part model. A novel reasoning algorithm by hybrid using of RBR and fuzzy evaluation method for locating design is proposed. It finds the search scope with RBR and optimal select the locating surfaces with fuzzy evaluation judgment and generates the feasible locating solution. A prototype is developed for verification of proposed algorithm. A case study is provided to show how the proposed algorithms work
{"title":"Algorithm for workpiece locating design","authors":"G. Chen, Yize Sun","doi":"10.1109/ISSCAA.2006.1627513","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627513","url":null,"abstract":"This paper proposed a novel approach for part locating design. A fixture feature recognition algorithm is presented. With the algorithm, the fixture feature could be extracted from 3D part model. A novel reasoning algorithm by hybrid using of RBR and fuzzy evaluation method for locating design is proposed. It finds the search scope with RBR and optimal select the locating surfaces with fuzzy evaluation judgment and generates the feasible locating solution. A prototype is developed for verification of proposed algorithm. A case study is provided to show how the proposed algorithms work","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124231256","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 : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627588
Junjie Peng, Jun Ma, B. Hong, Chengjun Yuan
Fault tolerance is of importance to increase the dependability of computer systems. However, it is hard to be evaluated and validated, which will be either time-consuming or costly. Fault injection is an effective method to validate fault tolerance mechanisms. Among different fault injection techniques, software-implemented fault injection (SWIFI) is the most promising one. Although interesting, major drawbacks of existing SWIFI are that temporal and spatial overheads induced into target systems will influence its behavior. In this paper, fault tolerance of an onboard system is tested by a new SWIFI technique which will not induce any additional overheads into the target system under test. The technique is based on embedded processor debug interface standard, Nexus, which ensures that faults are injected into the target system with its behavior being traced while not altering normal execution of the target system
{"title":"Validation of fault tolerance mechanisms of an onboard system","authors":"Junjie Peng, Jun Ma, B. Hong, Chengjun Yuan","doi":"10.1109/ISSCAA.2006.1627588","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627588","url":null,"abstract":"Fault tolerance is of importance to increase the dependability of computer systems. However, it is hard to be evaluated and validated, which will be either time-consuming or costly. Fault injection is an effective method to validate fault tolerance mechanisms. Among different fault injection techniques, software-implemented fault injection (SWIFI) is the most promising one. Although interesting, major drawbacks of existing SWIFI are that temporal and spatial overheads induced into target systems will influence its behavior. In this paper, fault tolerance of an onboard system is tested by a new SWIFI technique which will not induce any additional overheads into the target system under test. The technique is based on embedded processor debug interface standard, Nexus, which ensures that faults are injected into the target system with its behavior being traced while not altering normal execution of the target system","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127643792","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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