Pub Date : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627426
Weixian Tang, Zhong-ke Shi, Hong-chao Li
We propose a novel method that applies least-square support vector machines (LS-SVM) to denoising of impulse response signal for aircraft flight flutter test. This method is based on time series prediction using LS-SVM. Since the signal to noise ratio (SNR) varies with amplitude for the decaying property of damped sinusoid, the beginning data points with high SNR is used for training and prediction of the subsequent data with low SNR. In order to improve the performance of denoising, singular value decomposition (SVD) filtering is employed for signal preprocessing. Finally, the simulations and experiment on real flight test data demonstrate effectiveness and efficiency of our approach
{"title":"Denoising of impulse response using LS-SVM and SVD for aircraft flight flutter test","authors":"Weixian Tang, Zhong-ke Shi, Hong-chao Li","doi":"10.1109/ISSCAA.2006.1627426","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627426","url":null,"abstract":"We propose a novel method that applies least-square support vector machines (LS-SVM) to denoising of impulse response signal for aircraft flight flutter test. This method is based on time series prediction using LS-SVM. Since the signal to noise ratio (SNR) varies with amplitude for the decaying property of damped sinusoid, the beginning data points with high SNR is used for training and prediction of the subsequent data with low SNR. In order to improve the performance of denoising, singular value decomposition (SVD) filtering is employed for signal preprocessing. Finally, the simulations and experiment on real flight test data demonstrate effectiveness and efficiency of our approach","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"22 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":"129360414","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.2006.1627650
Qiming Ruan, Renjie He, Yuejin Tan, Yingwu Chen, Xiong Liu
As the number of Earth observing satellites increases, the opportunity of observation is much enhanced. Through coordination, several satellites can observe more area than single satellite in a given time horizon. Counterwise to this advantage, the scheduling problem of observations is NP-hard in computational complexity. Although the study on satellites scheduling problem has attracted much attention for years, those proposed researches are merely concerning spot targets which can not satisfy the requirements of observing area targets. This article presents the study of a satellites coordinating system, which can effectively coordinate imaging activities of satellites to meet the requirement of observing area targets
{"title":"Coordinating remote sensing for Earth observing satellites","authors":"Qiming Ruan, Renjie He, Yuejin Tan, Yingwu Chen, Xiong Liu","doi":"10.1109/ISSCAA.2006.1627650","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627650","url":null,"abstract":"As the number of Earth observing satellites increases, the opportunity of observation is much enhanced. Through coordination, several satellites can observe more area than single satellite in a given time horizon. Counterwise to this advantage, the scheduling problem of observations is NP-hard in computational complexity. Although the study on satellites scheduling problem has attracted much attention for years, those proposed researches are merely concerning spot targets which can not satisfy the requirements of observing area targets. This article presents the study of a satellites coordinating system, which can effectively coordinate imaging activities of satellites to meet the requirement of observing area targets","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"46 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":"129613682","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.2006.1627455
C. Jittilertwirun, K. Ahmed, R.M.A. Premanandana Rajatheva
Bit error rate of two-user cooperation over the uplink scheme frequency selective Rayleigh fading channel is presented in this paper. The time division multiple access (TDMA) scheme and the half-duplex mode of transmission are assumed. The network architecture is defined as symmetrical structure. We analyze the bit error rate of BPSK two-user cooperation in various relaying protocols where the perfect channel state information is available at the receiver. The relaying protocols are considered as amplify-and-forward, decode-and-forward, selection, and incremental relaying. We investigated the effects of various interuser SNRs on the performance. The result shows that the higher interuser SNRs, the better bit error rate performance. From the bit error rate performance comparison of all relaying protocols illustrates that the incremental relaying protocol give the best performance. This is the result of limited feedback in the incremental relaying from the destination yield a great improvement on the system performance
{"title":"Performance of two-user cooperation in frequency selective Rayleigh fading channel","authors":"C. Jittilertwirun, K. Ahmed, R.M.A. Premanandana Rajatheva","doi":"10.1109/ISSCAA.2006.1627455","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627455","url":null,"abstract":"Bit error rate of two-user cooperation over the uplink scheme frequency selective Rayleigh fading channel is presented in this paper. The time division multiple access (TDMA) scheme and the half-duplex mode of transmission are assumed. The network architecture is defined as symmetrical structure. We analyze the bit error rate of BPSK two-user cooperation in various relaying protocols where the perfect channel state information is available at the receiver. The relaying protocols are considered as amplify-and-forward, decode-and-forward, selection, and incremental relaying. We investigated the effects of various interuser SNRs on the performance. The result shows that the higher interuser SNRs, the better bit error rate performance. From the bit error rate performance comparison of all relaying protocols illustrates that the incremental relaying protocol give the best performance. This is the result of limited feedback in the incremental relaying from the destination yield a great improvement on the system performance","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"34 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":"130571678","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}
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.2006.1627558
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}
For the shortage of the system reliability datum in the initial stage of the design of a spaceborne antenna deployment mechanism, unascertained method for system reliability allocation is proposed. This method is based on the weighted allocation method. Through introducing the unascertained information into the matrix of weight coefficients, the unascertained model for the reliability allocation of a spaceborne antenna deployment mechanism is built. By means of the arithmetic operation rules of unascertained rational number, the expression of unascertained weighting coefficient is derived. Finally, the reliability allocation of a spaceborne antenna deployment mechanism is given as an example. The possible reliability values and faith degrees of the system are obtained. The rationality and validity of the presented method are demonstrated
{"title":"Reliability allocation of large spaceborne antenna deployment mechanism system using unascertained method","authors":"Zhentao Liang, Jianjun Chen, Wei Gao, Zengqing Zhu","doi":"10.1109/ISSCAA.2006.1627559","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627559","url":null,"abstract":"For the shortage of the system reliability datum in the initial stage of the design of a spaceborne antenna deployment mechanism, unascertained method for system reliability allocation is proposed. This method is based on the weighted allocation method. Through introducing the unascertained information into the matrix of weight coefficients, the unascertained model for the reliability allocation of a spaceborne antenna deployment mechanism is built. By means of the arithmetic operation rules of unascertained rational number, the expression of unascertained weighting coefficient is derived. Finally, the reliability allocation of a spaceborne antenna deployment mechanism is given as an example. The possible reliability values and faith degrees of the system are obtained. The rationality and validity of the presented method are demonstrated","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"32 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":"121317389","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.2006.1627586
Xinsheng Wang, Hanxu Sun
A fault tolerance design on onboard computer (OBC) is proposed that allows commercial-off-the-shelf (COTS) devices to be incorporated into dual processing modules of onboard computer. The processing module is composed of 32-bit ARM RISC processor and other COTS devices. As well as, a set of fault handling mechanisms is implemented in the computer system. The onboard software was organized around a set of processes that communicate between each other through a routing process. The fault tolerant onboard computer has excellent data processing capability and is enough to meet the demands of the extremely tight constraints on mass, volume, power consumption and space environmental conditions
{"title":"Fault tolerance design on onboard computer using COTS components","authors":"Xinsheng Wang, Hanxu Sun","doi":"10.1109/ISSCAA.2006.1627586","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627586","url":null,"abstract":"A fault tolerance design on onboard computer (OBC) is proposed that allows commercial-off-the-shelf (COTS) devices to be incorporated into dual processing modules of onboard computer. The processing module is composed of 32-bit ARM RISC processor and other COTS devices. As well as, a set of fault handling mechanisms is implemented in the computer system. The onboard software was organized around a set of processes that communicate between each other through a routing process. The fault tolerant onboard computer has excellent data processing capability and is enough to meet the demands of the extremely tight constraints on mass, volume, power consumption and space environmental conditions","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"76 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":"127219339","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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