{"title":"Plasma manipulation using a MHD-based device for a communication blackout in hypersonic flights","authors":"Minkwan Kim, A. Gulhan","doi":"10.1109/RAST.2011.5966868","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966868","url":null,"abstract":"When a vehicle flies with hypersonic velocity, a weakly ionized plasma layer is generated around the vehicle due to the shock heated air. Since the created plasma layer has a high electron number density, the vehicle has a communication difficulty known as radio blackout. In this study, we propose an innovative concept of a mitigation scheme based on MHD. The proposed mitigation scheme uses an ExB layer to manipulate the plasma density in a specific region during hypersonic flights. Due to the reduced electron number density in the plasma layer, it provides the possibility for communication during radio blackout.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131288021","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}
S. Kurnaz, Yelena M. Gambarova, R. Rustamov, A. Gambarov, M. Zeynalova
{"title":"Rare vegetation change detection in the Gobustan Conservation Area, Azerbaijan","authors":"S. Kurnaz, Yelena M. Gambarova, R. Rustamov, A. Gambarov, M. Zeynalova","doi":"10.1109/RAST.2011.5966804","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966804","url":null,"abstract":"The Gobustan State National Park (Conservation Area) is a nationally important desert/semi-desert located west and south-west of Baku, Azerbaijan. In 2007 Gobustan was declared a UNESCO World Heritage Site considered being of “outstanding universal value” for the quality and density of its rock art engravings. The Study Area at Gobustan contains a wealth of historical and archaeological sites and is also known for its rare vegetation.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120896062","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}
{"title":"Dynamics modeing and maneuverability analysis of a near-space earth observation platform","authors":"Yue-neng Yang, Jie Wu, Yu Xie, W. Zheng","doi":"10.1109/RAST.2011.5966828","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966828","url":null,"abstract":"Near-space autonomous airship represents a unique and promising platform for earth observation and surveillance that involve a long duration airborne presence. In this paper, a six-degrees-of-freedom dynamics model and maneuverability of a near-space earth observation platform are presented. First, the near-space earth observation platform is introduced, including the concept design, configuration, energy sources, propeller and payload. Second, reference frames and motion parameters of the platform are defined, and the kinematics equations describing the platform's dimensional motion are derived. The effects of gravity, buoyancy, added inertia, aerodynamics and thrust on the platform are incorporated into the dynamics analysis, and a dynamics model in vector form of the platform is derived based on Newton-Euler principle. Finally, a simulation program has been developed to implement the dynamics model and applied to analyze the maneuverability of the platform. It is hoped that this work is useful to support the evaluation of maneuverability and the development of control system for the near-space earth observation platform.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"187 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121549042","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}
{"title":"In flight magnetometer calibration via unscented Kalman filter","authors":"H. Soken, C. Hajiyev","doi":"10.1109/RAST.2011.5966970","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966970","url":null,"abstract":"In this study an unscented Kalman filter (UKF) based algorithm for the estimation of magnetometer biases and scale factors is proposed as a part of the attitude estimation scheme of a small satellite. UKF estimates magnetometer biases and scale factors as well as six attitude parameters of the satellite. Differently from the existing algorithms, scale factors are not treated together with the other parameters as a part of the state vector; three scale factors are estimated via a newly proposed extension for the UKF. Proposed algorithm is simulated for attitude estimation of a pico satellite which has three magnetometers and three rate gyros as measurement sensors. Besides, effects of non-calibrated magnetometers on attitude determination are shown via supplementary simulations.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128946355","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}
Sharmila Kayastha, O. Tekinalp, M. Ozgoren, N. Horri
{"title":"Gain scheduled inverse optimal control for fine pointing of a spacecraft camera","authors":"Sharmila Kayastha, O. Tekinalp, M. Ozgoren, N. Horri","doi":"10.1109/RAST.2011.5966977","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966977","url":null,"abstract":"The problem of controlling a system modeled as two coupled bodies, a spacecraft and a camera, is considered here. These two bodies are connected by active truss members forming a system of springs and piezoelectric actuators to damp out vibrations. There is also a satellite mounted reaction wheel cluster to perform slew maneuvers. An inverse optimal controller is designed to control the attitude of the satellite and improve the pointing performance of its large earth observation camera. It is based on gain scheduled minimum-norm optimization. A gain scheduling strategy is used in this paper to achieve an optimal tradeoff between settling time and integrated torque, under torque saturation constraints. Simulation results show that the proposed controller compares favorably with a conventional quaternion error feedback controller, which is used as a benchmark.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"300 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133649507","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}
O. Ceylan, Yasin Kurt, Furkan A. Tunc, H. B. Yagci, A. Aslan
{"title":"Low cost S Band communication system design for nano satellites","authors":"O. Ceylan, Yasin Kurt, Furkan A. Tunc, H. B. Yagci, A. Aslan","doi":"10.1109/RAST.2011.5966945","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966945","url":null,"abstract":"Nano satellite structures have limited communication ability due to limited power and size. Most of satellite includes sensors, for instance camera, also image transfer requires more data transfer speed. In this project, 2.4 GHz (S Band) communication system is designed for LEO satellites (700–900 km). System includes system-on-chip transmitter device, preamplifier, band pass filter, power amplifier and microstrip antenna array. Microstrip antenna array and RF circuit is designed on FR4. Microstrip array size is 92×84mm2 and RF circuit size is 38×53mm2. Output power of the system is 35dBm for 2.4kbaud data rate, but it can be increased to power capability of the satellite for more data rate.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131202879","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}
{"title":"Optimal impulsive orbital transfer between coplanar-noncoaxial orbits, local and global solutions","authors":"M. Navabi, M. Sanatifar","doi":"10.1109/RAST.2011.5966844","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966844","url":null,"abstract":"Nowadays, orbital transfer has a significant role in any space mission, and it can be firmly said that there is no space mission that does not need to the orbital transfer. On the other hand, since the cost of each space mission is very important and the mass of fuel directly related to the cost, decreasing the fuel usage has always been an important issue. So the discussion of minimization of fuel consumption in orbital transfer has always been considered important. Hence, the problem of fuel optimization in orbital transfer has a long history and many scientists have worked on this problem and solved many special and simple cases. To solve the problems with more complex geometry, such as optimal impulsive orbital transfer among coplanar non co-axial orbits, numerical solution of nonlinear equations is required which is extracted from the optimization. Numerical solution of these equations is very sensitive to initial guess values and the convergence process is very slow. Also solving these equations lead only to a local minimum and there is no assurance for global minimum. In this paper, to extract the optimization equations, some explicit equations have been extracted so the process to reach all solutions will be possible. These equations are not provided in other articles. Our method is implemented on two numerical examples. Results have shown acceptable accuracy and high speed calculation of this method.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"4 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131437902","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}
{"title":"Inexpensive CubeSat attitude estimation using COTS components and Unscented Kalman Filtering","authors":"J. A. Larsen, K. Vinther","doi":"10.1109/RAST.2011.5966853","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966853","url":null,"abstract":"This paper describes a quaternion implementation of an Unscented Kalman Filter for attitude estimation on CubeSats using measurements of a sun vector, a magnetic field vector and angular velocity. Using unit quaternions provides a singularity free attitude parameterization. However, the unity constraint requires a redesign of the Unscented Kalman Filter. Therefore, a quaternion error state is introduced. Emphasis has been put in making the implementation accessible to other CubeSat by using realistic models of COTS components used for attitude sensing and simulations have shown that the extra computational cost of estimating bias in measurements is worthwhile. The simulations where performed in a simulation environment for the CubeSat AAUSAT3, where robustness has been an important factor during tuning of the attitude estimators. The results indicate that it is possible to achieve acceptable CubeSat attitude estimation, even during eclipse, on a limited budget and using COTS components, without the need of expensive high precision sensor setups.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"210 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121036360","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}
{"title":"Advances space technology for project management in early stage of the design work","authors":"S. Kurnaz, S. Hasanova, R. Rustamov, N. Rahimov","doi":"10.1109/RAST.2011.5966805","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966805","url":null,"abstract":"Geographical information System (GIS) is an instrument for integration appropriate spatial data into the geographical system. The data based on space information received from satellite for the purpose needed to be considered for indicated problem solution can be provided by using remote sensing methods throughout satellite images. This instrument allows gathering, storing, analyzing, editing, sharing information and successfully using in wide required areas. In the meantime GIS is a tool creating an environment for interactive quires, analyze the spatial information, edit data, develop maps and present outcomes of all these operations.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121352394","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}
E. Koyuncu, E. Baskaya, M. Cihan, Soner Isiksal, Melih Fidanoglu, Caner Akay, A. Cetin, B. Karadag, Y. Kaya, Berat Karyot, Cingiz Haciyev, I. Ozkol, M. O. Kaya, G. Inalhan
{"title":"ITU-pSAT II: High-precision nanosatellite ADCS development project","authors":"E. Koyuncu, E. Baskaya, M. Cihan, Soner Isiksal, Melih Fidanoglu, Caner Akay, A. Cetin, B. Karadag, Y. Kaya, Berat Karyot, Cingiz Haciyev, I. Ozkol, M. O. Kaya, G. Inalhan","doi":"10.1109/RAST.2011.5966887","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966887","url":null,"abstract":"ITU-pSAT II project aims to design and develop standardized bus architecture and an ADCS for pico and nano sized satellites. In order for nano-satellites to perform more capable missions, precise attitude control and more capable bus designs are needed. ITU-PSAT II is considered as follow-on to the ITU-PSAT I project, it includes multi-purpose bus and a 3-axis controlled platform, which can be used in future missions with different payload configurations. ITU-pSAT II bus and ADCS operation architecture also embeds a health monitoring system in order to cooperatively detect and successfully handle the highly possible failure modes (such as sensor, actuator failures and errors). In this paper, we review the architecture of ADCS, its subcomponents and strategy of combining ADCS operation modes.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128793299","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}