A novel kind of T/R module is introduced in the article. Basic principle of receiving beam scanning is reviewed and the method of using coupled oscillators to realize the receiving beam-scanning is detailed. Then a kind of more realistic scanning system possessing transmitting and receiving functionality is introduced. The T/R module based on the new beam-scanning system has the merits of low profile, low cost and high efficiency
{"title":"A novel transmit-receive module based on coupled oscillators","authors":"Zhikai Tang, Longhe Liu, Yonghua Jiang, Yuan Hao, Weiliang Gao","doi":"10.1109/ISSCAA.2006.1627556","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627556","url":null,"abstract":"A novel kind of T/R module is introduced in the article. Basic principle of receiving beam scanning is reviewed and the method of using coupled oscillators to realize the receiving beam-scanning is detailed. Then a kind of more realistic scanning system possessing transmitting and receiving functionality is introduced. The T/R module based on the new beam-scanning system has the merits of low profile, low cost and high efficiency","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"16 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":"115698291","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.2006.1627558
Jinpeng Yuan, Di Yang, Xiaosong Sun
Tracking and data relay satellite system (TDRSS) is one of the hot spots in the development of the aerospace engineering recently. It is a challenging task to design the SA pointing control system with high pointing accuracy to ensure the communication between the tracking and data relay satellite (TDRS) and the user satellites. The SA pointing control system is designed in this paper in detail. Firstly the dynamic model of the TDRS is established using the Lagrange equation. Secondly the control scheme of the TDRS satellite is selected for the main body and the single access antennae. The tracking laws are derived and the antenna's azimuth and elevation angles can be derived by the tracking laws when the TDRS is tracking the user satellites. Thirdly the antenna pointing control concepts are described, and the on-board autonomous control method is designed. The on-board autonomous control scheme is composed of acquisition and autotrack modes. On one hand the acquisition process of the SA antenna is designed. On the other hand, the antenna step logic of the autotrack mode is properly selected. The SA antenna is driven by two-phase permanent magnetic stepper motor, and the mathematical model of the stepper motor is established. Finally, the mathematic simulation of the antenna pointing control system designed in this paper is conducted in the case of taking the user satellite and the ground station as tracking objects according to tracking laws derived before, and the SA antenna pointing performance of the TDRS is demonstrated by the analysis of the simulation results
{"title":"Single access antenna pointing control system design of TDRS","authors":"Jinpeng Yuan, Di Yang, Xiaosong Sun","doi":"10.1109/ISSCAA.2006.1627558","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627558","url":null,"abstract":"Tracking and data relay satellite system (TDRSS) is one of the hot spots in the development of the aerospace engineering recently. It is a challenging task to design the SA pointing control system with high pointing accuracy to ensure the communication between the tracking and data relay satellite (TDRS) and the user satellites. The SA pointing control system is designed in this paper in detail. Firstly the dynamic model of the TDRS is established using the Lagrange equation. Secondly the control scheme of the TDRS satellite is selected for the main body and the single access antennae. The tracking laws are derived and the antenna's azimuth and elevation angles can be derived by the tracking laws when the TDRS is tracking the user satellites. Thirdly the antenna pointing control concepts are described, and the on-board autonomous control method is designed. The on-board autonomous control scheme is composed of acquisition and autotrack modes. On one hand the acquisition process of the SA antenna is designed. On the other hand, the antenna step logic of the autotrack mode is properly selected. The SA antenna is driven by two-phase permanent magnetic stepper motor, and the mathematical model of the stepper motor is established. Finally, the mathematic simulation of the antenna pointing control system designed in this paper is conducted in the case of taking the user satellite and the ground station as tracking objects according to tracking laws derived before, and the SA antenna pointing performance of the TDRS is demonstrated by the analysis of the simulation results","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"119 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":"116195899","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.2006.1627555
Fang Ye, Yibing Li, Shen-yuan Yang
Linear frequency modulation (LFM or chirp) signals are widely used in information systems, how to detect and estimate LFM signals is an important problem. However, using traditional array signal process couldn't commendably estimate DOA of LFM signal, because which is a nonstationary signal. Aim at this problem, the paper combined array signal process and fractional Fourier transform (FRFT), proposed extracting signal from the mixture of sources and noise using time-frequency revolving characteristic of FRFT. Then obtained unambiguous initial frequency and frequency modulation slope estimates from the output of the reference element, while combining music arithmetic to estimate 2-D DOA. This paper puts forward a new technique for LFM signal process, which has practical applied importance
{"title":"2-D DOA estimation of LFM signal based on FRFT","authors":"Fang Ye, Yibing Li, Shen-yuan Yang","doi":"10.1109/ISSCAA.2006.1627555","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627555","url":null,"abstract":"Linear frequency modulation (LFM or chirp) signals are widely used in information systems, how to detect and estimate LFM signals is an important problem. However, using traditional array signal process couldn't commendably estimate DOA of LFM signal, because which is a nonstationary signal. Aim at this problem, the paper combined array signal process and fractional Fourier transform (FRFT), proposed extracting signal from the mixture of sources and noise using time-frequency revolving characteristic of FRFT. Then obtained unambiguous initial frequency and frequency modulation slope estimates from the output of the reference element, while combining music arithmetic to estimate 2-D DOA. This paper puts forward a new technique for LFM signal process, which has practical applied importance","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"64 837 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":"116204858","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}
Major efforts in space optics have inspired research in high performance, low cost, very lightweight reflective telescope systems in which Cassegrain system is widely used. Silicon carbide which has unique combination of attributes is used as the primary mirror material in this paper. According to the design requirement and processing technique of the mirror, and analyzing the effect of the sector, the triangle and the hexagon cell structures on the static and dynamic properties of the mirror, the triangle cell structure which has the best combination property is selected as the original scheme. Finite element method is used to build the parameterization model for the optimum structural design. The structure parameters such as thickness of the mirror and the faceplate which have more effect on the mass of the mirror and the maximum deformation of the mirror surface are selected as the design variables. After the optimization, a 256 mm diameter mirror with 24.5 mm thickness and 1.22 kg weight is gained. The lightweight ratio of the mirror is about 52.5 %, and the wavefront error (WFE) is satisfactory with the design requirements
{"title":"Optimum structural design of lightweight silicon carbide mirror in Cassegrain system","authors":"Yuan-yuan Han, Yumin Zhang, Jiecai Han, Jianhan Zhang, W. Yao, Yufeng Zhou","doi":"10.1109/ISSCAA.2006.1627494","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627494","url":null,"abstract":"Major efforts in space optics have inspired research in high performance, low cost, very lightweight reflective telescope systems in which Cassegrain system is widely used. Silicon carbide which has unique combination of attributes is used as the primary mirror material in this paper. According to the design requirement and processing technique of the mirror, and analyzing the effect of the sector, the triangle and the hexagon cell structures on the static and dynamic properties of the mirror, the triangle cell structure which has the best combination property is selected as the original scheme. Finite element method is used to build the parameterization model for the optimum structural design. The structure parameters such as thickness of the mirror and the faceplate which have more effect on the mass of the mirror and the maximum deformation of the mirror surface are selected as the design variables. After the optimization, a 256 mm diameter mirror with 24.5 mm thickness and 1.22 kg weight is gained. The lightweight ratio of the mirror is about 52.5 %, and the wavefront error (WFE) is satisfactory with the design requirements","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"349 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":"121617908","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.2006.1627544
G. Duan, Feng Tan
A smooth switching strategy is proposed to attenuate the chattering at the switching point for time-varying systems under multi-model switched controllers. The internal characteristics of the system are thoroughly considered and smooth switching is realized by letting the closed-loop eigenvectors, instead of the traditional feedback gain matrix, vary gradually. The method is applied to the control of a BTT autopilot system. Simulation results show that the method proposed in this paper has obvious advantage over the traditional one
{"title":"A new smooth switching strategy for multi-model control and its application on a BTT missile","authors":"G. Duan, Feng Tan","doi":"10.1109/ISSCAA.2006.1627544","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627544","url":null,"abstract":"A smooth switching strategy is proposed to attenuate the chattering at the switching point for time-varying systems under multi-model switched controllers. The internal characteristics of the system are thoroughly considered and smooth switching is realized by letting the closed-loop eigenvectors, instead of the traditional feedback gain matrix, vary gradually. The method is applied to the control of a BTT autopilot system. Simulation results show that the method proposed in this paper has obvious advantage over the traditional one","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"40 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":"123992894","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.2006.1627529
Dongsheng Liu, Yi Zhou
With the development of Internet, how to extract the useful information from data with the characteristics of distributed, mass, heterogeneous, complicated and correlative has become one of the most important problems in the domain of distributed data mining. To the limitation of the traditional ID3 algorithm, this paper presents an advanced distributed ID3 algorithm with its model based on mobile-agent technology. And finally, the executing result of this model will prove the efficiency and scientificalness of the algorithm
{"title":"Distributed ID3 model based on mobile agent","authors":"Dongsheng Liu, Yi Zhou","doi":"10.1109/ISSCAA.2006.1627529","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627529","url":null,"abstract":"With the development of Internet, how to extract the useful information from data with the characteristics of distributed, mass, heterogeneous, complicated and correlative has become one of the most important problems in the domain of distributed data mining. To the limitation of the traditional ID3 algorithm, this paper presents an advanced distributed ID3 algorithm with its model based on mobile-agent technology. And finally, the executing result of this model will prove the efficiency and scientificalness of the algorithm","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"35 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":"127914623","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.2006.1627515
Ying-wei Zhang, Jianchang Liu, Xingwang Yang, B. Jiang, Tim Hesketh
This paper presents a methodology for the design of networked control systems with long delay by using output feedback to a given plant. The resulting closed-loop control system is stable in the sense that it provides guaranteed internal stability and Hinfin performance (in terms of disturbance attenuation). A numerical example is given to illustrate the proposed design procedures
{"title":"Stabilization of networked control systems","authors":"Ying-wei Zhang, Jianchang Liu, Xingwang Yang, B. Jiang, Tim Hesketh","doi":"10.1109/ISSCAA.2006.1627515","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627515","url":null,"abstract":"This paper presents a methodology for the design of networked control systems with long delay by using output feedback to a given plant. The resulting closed-loop control system is stable in the sense that it provides guaranteed internal stability and Hinfin performance (in terms of disturbance attenuation). A numerical example is given to illustrate the proposed design procedures","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":"128029202","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.2006.1627407
Tao Wang, Daxin Liu
This paper considers the uncontrolled priority inversion problem occurs when a higher-priority thread is suspended because a lower-priority thread has a needed resource. A new strategy is presented to prevent uncontrolled priority inversion which integrates the priority inheritance protocol, the priority ceiling protocol, and the task classification based upon the priority of their subtasks relative to the task into preemption threshold scheduling. The new strategy provides schedulability improvement and reduces the excessive preemption overhead
{"title":"Avoiding unbounded priority inversion by integrating task inheritance and classification into preemption threshold scheduling","authors":"Tao Wang, Daxin Liu","doi":"10.1109/ISSCAA.2006.1627407","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627407","url":null,"abstract":"This paper considers the uncontrolled priority inversion problem occurs when a higher-priority thread is suspended because a lower-priority thread has a needed resource. A new strategy is presented to prevent uncontrolled priority inversion which integrates the priority inheritance protocol, the priority ceiling protocol, and the task classification based upon the priority of their subtasks relative to the task into preemption threshold scheduling. The new strategy provides schedulability improvement and reduces the excessive preemption overhead","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":"128996685","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.2006.1627664
Y. Zhao, M. Haseyama, H. Kitajima
In this paper an improvement is proposed to solve a problem in the object recognition using GRAS: when an object is rotated, the change may not be acceptable by GRAS in most cases. The proposed algorithm searches the shape of a given object to define some nodes by Archimedes's spiral, and transforms the nodes into a directed graph. Then, it defines some interrelated graph characteristics to compare the given object with others. The performance of the proposed algorithm is presented via experimental results which compare the recognition accuracy of GRAS and proposed algorithm
{"title":"An improved GRAS algorithm using Archimedes's spiral","authors":"Y. Zhao, M. Haseyama, H. Kitajima","doi":"10.1109/ISSCAA.2006.1627664","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627664","url":null,"abstract":"In this paper an improvement is proposed to solve a problem in the object recognition using GRAS: when an object is rotated, the change may not be acceptable by GRAS in most cases. The proposed algorithm searches the shape of a given object to define some nodes by Archimedes's spiral, and transforms the nodes into a directed graph. Then, it defines some interrelated graph characteristics to compare the given object with others. The performance of the proposed algorithm is presented via experimental results which compare the recognition accuracy of GRAS and proposed algorithm","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":"130515789","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.2006.1627473
Zengyuan Bian, Yongquan Yu, Bi Zeng, Minghui Wang, Huifeng Mao
In this paper, we propose a novel evolution strategies algorithm to improve the speed of the evolution strategies. Our scheme is based on selected the direction of the polar coordinates by the polar coordinates. Our object is to develop the traditional evolves strategies, costing the least time and achieve the best result. This new algorithm shows more improved characteristics than conventional approach. Further, the efficiency of the method is verified by two simulation results
{"title":"A novel evolution strategy algorithm based on the selected direction by the polar coordinates","authors":"Zengyuan Bian, Yongquan Yu, Bi Zeng, Minghui Wang, Huifeng Mao","doi":"10.1109/ISSCAA.2006.1627473","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627473","url":null,"abstract":"In this paper, we propose a novel evolution strategies algorithm to improve the speed of the evolution strategies. Our scheme is based on selected the direction of the polar coordinates by the polar coordinates. Our object is to develop the traditional evolves strategies, costing the least time and achieve the best result. This new algorithm shows more improved characteristics than conventional approach. Further, the efficiency of the method is verified by two simulation results","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"9 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":"130572852","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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