Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011最新文献

{"title":"Magnetosheath cavities: Cluster observations and kinetic hybrid model comparisons","authors":"Filiz Turk Katircioglu, Z. Kaymaz, N. Omidi, D. Sibeck","doi":"10.1109/RAST.2011.5966906","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966906","url":null,"abstract":"High energy particles cause depressed magnetic field and density regions in the foreshock region which are called as foreshock cavities. These cavities are formed as a result of the interaction between the backstreaming ions energized at and reflected from the bow shock. This study investigates whether similar structures are present in the magnetosheath region, and if so, what their characteristics and possible sources are using Cluster observations and compare the results from those obtained using kinetic hybrid particle simulations. Our search shows that the magnetic field strength and ion density are depressed up to 50% in the presence of high energetic (>30 keV) ion particle fluxes. Also slight decreases in ion velocity and increases in ion temperature are seen. The depressed magnetic field and density characterize the magnetosheath cavities. Our search also indicates that magnetosheath cavities occur during the low IMF cone angles less than 30°. We run a 2,5-D kinetic-hybrid particle model for radial IMF (cone angle is 0°) and inclined IMF (cone angle is 45°), to understand the response of the magnetosheath under these conditions. The simulation results clearly demonstrate that the magnetosheath cavities form when the IMF cone angle is low and verify Cluster observations. These results from the model suggest that the solar wind carries the foreshock cavities into the magnetosheath under the low IMF cone angle (radial IMF) conditions. In this study, we compare the magnetic field and density structure of the magnetosheath from the model pointing at the similarities and differences. The particles accelerated to high energies at various energy levels as they pass through the Earth's bow shock. Their further transport with the solar wind into the magnetosheath modifies the magnetosheath's magnetic and plasma characteristics. In the model, depressed magnetic field and ion density regions are seen more distinctly toward the mid latitude magnetosheath. Model's magnetosheath cavities display highly structured and turbulent features and they seem to depend on the location in the magnetosheath. These periodic, high amplitude fluctuations within the model magnetosheath cavities indicate wave activity and wave-particle interactions and that they tend to be stronger and are more evident toward the higher latitudes of the magnetosheath.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"36 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":"115891566","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":"An SDR based AIS receiver for satellites","authors":"J. A. Larsen, H. Mortensen, J. Nielsen","doi":"10.1109/RAST.2011.5966893","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966893","url":null,"abstract":"For a few years now, there has been a high interest in monitoring the global ship traffic from space. A few satellite, capable of listening for ship borne AIS transponders have already been launched, and soon the AAUSAT3, carrying two different types of AIS receivers will also be launched. One of the AIS receivers onboard AAUSAT3 is an SDR based AIS receiver. This paper serves to describe the background of the AIS system, and how the SDR based receiver has been integrated into the AAUSAT3 satellite. Amongst some of the benefits of using an SDR based receiver is, that due to its versatility, new detection algorithms are easily deployed, and it is easily adapted the new proposed AIS transmission channels.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"71 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":"114879273","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":"A new subband domain method for spatial frequency based image fusion","authors":"N. H. Kaplan, I. Erer","doi":"10.1109/RAST.2011.5966826","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966826","url":null,"abstract":"A new image fusion algorithm, based on lattice filters and spatial frequency, to merge ERS and multispectral SPOT data is presented. First, ERS and SPOT data are decomposed into their subbands with analysis lattice filter structure. The detail subbands are decomposed into blocks, and these blocks are merged according to a predefined Spatial Frequency based rule. Finally, the fused image is obtained by synthesis lattice filter structure.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"1 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":"117158443","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":"Simulating the earth magnetic field according to the 10th generation of IGRF coefficients for spacecraft attitude control applications","authors":"M. Navabi, N. Nasiri","doi":"10.1109/RAST.2011.5966905","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966905","url":null,"abstract":"In recent decades utilizing satellites in low earth orbits have had increasing tendency. These satellites experience the earth magnetic field more than others. The earth magnetic is used to control the attitude of spacecraft by the interaction between the earth magnetic field and magnetic dipoles. First of all, in order to use this phenomenon the intensity and the direction of the earth magnetic field have to be obtained. There are various ways in order to simulate the earth magnetic field and among these ways the most accurate one is the harmonic coefficients and the earth magnetic field mathematical model. In this study, the earth magnetic field is modeled based on the 10th generation of the IGRF coefficients and the results are verified with a valid reference. To utilize the earth magnetic field in the attitude control of a spacecraft, it is necessary to transform the magnetic filed into the spacecraft body frame. The transformation between orbital and body frame could be linear or nonlinear. In the next step, based on the comparison of the results of the spacecraft attitude dynamics with linear and nonlinear transformation, the validity of linear transformation is studied regarding spacecraft attitude angles.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"134 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":"116409141","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":"A global space policy that would revive space exploration","authors":"T. Sharma, C. Chatwin, R. Young, P. Birch","doi":"10.1109/RAST.2011.5966963","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966963","url":null,"abstract":"Almost every nation today relies on space-based technology for communications, weather forecasting, satellite navigation and resource management, either through indigenous programs or through programs run by its allies. As such, it is safe to say that every country is a space-faring nation. However, when it comes to space science and technology, attention must be directed towards countries that possess the ability to launch payloads.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"63 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":"122119558","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":"Development of a fly-back CANSAT in 3 weeks","authors":"M. E. Umit, W. Cabañas, M. Tetlow, H. Akiyama, Shusaku Yamaura, S. Olaleye","doi":"10.1109/RAST.2011.5966953","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966953","url":null,"abstract":"Two CanSats are developed in Wakayama University by international researchers in one month. The first CanSat was developed in less than three days. The second CanSat was more advanced and developed in three weeks. The design and development phases are explained in this paper.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"23 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":"123957659","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":"Applicability of ECSS E-TM-10-21 to national space programs","authors":"Mustafa Aydin","doi":"10.1109/RAST.2011.5966919","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966919","url":null,"abstract":"The European Cooperation for Space Standardization (ECSS) has published ECSS-TM-10-21 in 2010 which covers simulation facilities utilized throughout several phases of space system development lifecycle. The main driver for the standardization effort was to uniquely identify the configurations employed by several industries and institutions under different names and portray a clear picture of modeling and simulation applications primarily intended to guide the system engineering process. Although the memorandum can be used as a guideline for the standardization of the modeling & simulation (M&S) processes involved in the national space programs, certain adaptations shall be performed to fit to the local context.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"6 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":"129415032","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":"A reentry trajectory planning approach satisfying waypoint and no-fly zone constraints","authors":"Yu Xie, Luhua Liu, G. Tang, W. Zheng","doi":"10.1109/RAST.2011.5966833","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966833","url":null,"abstract":"A trajectory planning approach is proposed for the reentry vehicle with relatively high lift-to-drag ratio. Multiple constraints including waypoints and no-fly zones are taken into consideration. The three-dimensional trajectory planning problem is decomposed into a longitudinal trajectory planning subproblem and a lateral trajectory planning subproblem. The former is to determine a drag-energy profile (D-E profile) that is consistent with the required trajectory length and satisfies the given path constraints except waypoints and no-fly zones. The latter is to specify the sign of bank angle for satisfying the waypoint and no-fly zone constraints and minimizing the final crossrange error. The trajectory length and lateral maneuverability may not meet requirements, so an adjustment of D-E profile is required after solving the previous subproblems. Thus, the longitudinal trajectory planning and lateral trajectory planning subproblems are iteratively solved to converge to a feasible three-dimensional trajectory which meets all the path and terminal constraints. The trajectory planning approach is tested using the Common Aero Vehicle model. Simulations demonstrate that the approach consistently achieves the desired target conditions within allowable tolerances and satisfies waypoint and no-fly zone constraints.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"70 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":"129742951","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":"Space environment and evaluation for RASAT","authors":"M. Hudaverdi, I. Baylakoğlu","doi":"10.1109/RAST.2011.5966978","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966978","url":null,"abstract":"The space environment is a set of surrounding composed of energetic particle radiation, micrometeoroids and space debris. The quantity of each element is defined by external physical world for a given launch time, altitude and duration of a specific mission. Proper evaluation is the key to verify best performance, problem avoidance and survivability of a system in space environment. In this work, the space environment analysis and evaluation for RASAT is reported with an emphasis on radiation analysis as being the most significant source of space product failures. For 2 mm aluminium shielding thickness, the forecasted value of total ionizing dose (TID) is 1.89 × 104 rads (Si) and non-ionizing displacement damage dose (DDD) is 5.42 × 107 MeV/g(Si) for 5-year mission lifetime of RASAT. We estimate 0.0005 m−2 flux of 1 mgr space debris for 5-year. Based on the analysis and evaluation results it is determined that RASAT components should not be less than ∼20 krad.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"1 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":"128508623","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":"Design and implementation of intelligent decision making system to generate flight scenario automatically","authors":"S. M. Dehghan, S. H. Cheheltani, Ali Kiapasha","doi":"10.1109/RAST.2011.5966817","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966817","url":null,"abstract":"In this paper, a new structure of an autonomous system generating a valid flight scenario for a satellite is designed and implemented. The hypothetical mission of this satellite is imaging from any points which are specified by users and also acquiring a sequence of imaged from high priority points on earth like fires jungles or volcano. The main intelligent decision making system in the satellite has to generate flight scenario of a microsatellite by receiving longitude and latitude of each requested imaging point from the earth. In this article an introduction of intelligent systems and their architecture for a typical microsatellite, cooperation scenarios between ground stations and a satellite and their missions are investigated. Finally the proposed intelligent system architecture and implementation of each layer and their integration is discussed. To test this new developed architecture a proper test bench is designed too. One of the approaches is adding some degree of autonomy to OBC of a satellite. All goals that are mentioned for an intelligent system and expansion in autonomy lead to self-based decision making process. This onboard decision making process is helpful in those situations that are not previewed on earth therefore are not scheduled to be done by satellite. This facility helps the system to pass the unsafe situations and response to them in a best way. At least this aspect can reduce destructible side effects of sudden situations.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"1 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":"129246336","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}