International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of最新文献

{"title":"SAC-C and the AM constellation: three years of achievements","authors":"F. Colomb, C. Varotto","doi":"10.1109/RAST.2003.1303893","DOIUrl":"https://doi.org/10.1109/RAST.2003.1303893","url":null,"abstract":"SAC-C is an international Earth observation satellite mission conceived as a partnership between CONAE and NASA, with additional support in instrumentation and satellite development from the Danish DSRI, the Italian ASI, the French CNES and the Brazilian INPE. A Delta II rocket successfully launched it on November 21st, 2000, from Vandenberg AFB, California, USA. There are ten instruments on board SAC-C, which perform different studies: the Multispectral Medium Resolution Scanner (MMRS), provided by CONAE, Argentina, helps in the study of evaluation of desertification processes and their evolution in time (i.e., Patagonia, Argentina), to identify and predict agricultural production, to monitor flood areas and to make studies in coastal and fluvial areas. The MMRS is associated with a High Resolution Technological Camera (HRTC), also provided by CONAE, that helps enhance MMRS resolution in the areas required. A High Sensitivity Technological Camera (HSTC) is also included in the mission and provided by CONAE. SAC-C also carries instruments to monitor the condition and dynamics of the terrestrial and marine biosphere and environment (GPS OccuLtation and Passive reflection Experiment (GOLPE)) from NASA/JPL. The Magnetic Mapping Payload (MMP) developed by the Danish Space Research Institute and JPL helps to better understand the Earth's magnetic field and related Sun-Earth interactions. Italian Star Tracker (IST) and Italian Navigation Experiment (INES) developed by the Italian Space Agency, constitute a technological payload that permits testing a fully autonomous system for attitude and orbit determination. Influence of space radiation on advanced components (ICARE), provided by CNES allows improvement of risk estimation models for radiation effect on last generation integrated circuit technology. On June 14th, 2000 CONAE and NASA signed an amendment to the Memorandum of Understanding for the SAC-C mission in order to include the SAC-C satellite in the \"International Morning Constellation\". This constellation is integrated by US satellites Landsat 7, EO 1 and Terra, and the Argentine SAC-C that feature on-board instruments from the United States, Argentina, Denmark, Italy, France, and Japan.","PeriodicalId":272869,"journal":{"name":"International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130569058","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":"Remote sensing data for seismic activity in SW Bulgaria","authors":"M. Matovà, R. Glavcheva, E. Botev, R. Petkovski","doi":"10.1109/RAST.2003.1303909","DOIUrl":"https://doi.org/10.1109/RAST.2003.1303909","url":null,"abstract":"Numerous faults, photolineaments and concentric structures are established based on field research and interpretation of Landsat 1 remote sensing data. The territory of SW Bulgaria was and is the most seismically active in this country. The concentration of weak earthquake epicenters (1990-2002) and several cases of their migration take place in small blocks, limited by faults (photolineaments), in the concentric structures or along the faults and photolineaments. The results of our complex analysis indicate that: (i) the seismic manifestations migrate in several predominant directions; (ii) the epicenter distribution corresponds to the direction of main lineaments and concentric structures, (iii) the activated volumes cover consecutive segments of certain photolineaments, concentric structures and/or the blocks between them.","PeriodicalId":272869,"journal":{"name":"International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134139039","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 novel approach for synthetic aperture radar image processing based on Genetic Algorithm","authors":"M. Aydemir, T. Gunel, I. Erer, S. Kurnaz","doi":"10.1109/RAST.2003.1303944","DOIUrl":"https://doi.org/10.1109/RAST.2003.1303944","url":null,"abstract":"In this study, an evolutionary computing algorithm is utilized for data preparation and analysis of synthetic aperture radar (SAR) imagery for planetary geology. Since its invention by J.H. Holland in the 1990s, the Genetic Algorithm (GA) has already gained popularity in a wide range of engineering applications. The genetic approach is used for processing of SAR imagery to find a region of a pre-defined criterion. It was seen that the algorithm is superior to deterministic methods in terms of processing times and finding the global minimum points. The proposed method is suitable to SAR image processing where huge amounts of data have to be processed in very short time intervals.","PeriodicalId":272869,"journal":{"name":"International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131827218","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":"Micro synthetic jets and their interaction with a cross flow in slip regime","authors":"F. O. Edis, N. Erbaş, O. Baysal, A. Aslan","doi":"10.1109/RAST.2003.1303981","DOIUrl":"https://doi.org/10.1109/RAST.2003.1303981","url":null,"abstract":"The flow field generated in and around a micro synthetic jet actuator is analyzed using the an existing Navier-Stokes solver. The solver is modified to accommodate slip wall boundary condition proposed in literature for micro scale flow problems. Two actuator cavity shapes, rectangular and triangular, are investigated for quiescent and cross-flow external domain conditions. Results are presented and compared for slip and no-slip conditions. Cavity shape is found to affect the orifice expulsion velocity profile. Cross-flow affects the orifice velocity distribution as well as the flow field inside the cavity.","PeriodicalId":272869,"journal":{"name":"International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132914699","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 method for estimating space launch vehicle parameters and technological assessment","authors":"K. Toker, U. Arkun, T. Tinaztepe","doi":"10.1109/RAST.2003.1303953","DOIUrl":"https://doi.org/10.1109/RAST.2003.1303953","url":null,"abstract":"This study is based on the work performed by the authors, in the research project funded by Turkish Ministry of Defense under the lead of the Turkish Air Force. The first aim is to develop a computer simulation model to simulate launch missions of small satellites up to medium Earth orbits. The second aim is to apply the model to a specific launch problem, evaluate the results in terms of their validity and to conclude with an assessment on the realization of the problem by the current technological infrastructure in Turkey.","PeriodicalId":272869,"journal":{"name":"International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of","volume":"2 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131436845","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":"Robust nonlinear H/sub /spl infin// autopilot design","authors":"M. Jalili-Kharaajoo, F. Besharati","doi":"10.1109/RAST.2003.1303989","DOIUrl":"https://doi.org/10.1109/RAST.2003.1303989","url":null,"abstract":"In this paper, the design of nonlinear H/sub /spl infin// controller for autopilot application is presented. The design of nonlinear H/sub /spl infin// control action leads to a partial differential inequality or equation, namely, Hamilton-Jacobi-Isaacs (HJI) inequality. It is too difficult, if not impossible, to find an exact closed form solution for this inequality. However, there are some approximate solutions. In this paper, we will make use of one of the most efficient possible methods, Taylor Series Expansion of nonlinear terms appear in HJI. Simulation results of the proposed method on a missile's autopilot design show the effectiveness of the proposed algorithm.","PeriodicalId":272869,"journal":{"name":"International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127865858","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":"Study on the simulation of the spacecraft's inertia and mass properties of a novel docking dynamics test bed","authors":"C. Zhigang, Zhang Guangyu, Zhao Xuezeng","doi":"10.1109/RAST.2003.1303932","DOIUrl":"https://doi.org/10.1109/RAST.2003.1303932","url":null,"abstract":"A special double barbell simulator (DBS) is proposed to simulate the inertia and mass properties of spacecraft in a novel ground docking dynamics test bed. With the DBS, the test bed can accurately simulate the docking process to study the capturing and buffering capabilities of the docking mechanism. By adjusting the DBS's parameters such as barbell mass and length, the simulator can simulate different spacecraft inertia and mass properties, so the test bed can simulate different spacecraft docking processes. This paper presents the configuration of the DBS and its layout on the test bed, discusses the simulator parameters and adjusting method, and formulates a mathematical model. An example is included to demonstrate the application of the DBS. It is shown that the simulator is convenient and accurate to simulate different spacecraft inertia and mass properties, and the inertia error is less than 0.006 percent.","PeriodicalId":272869,"journal":{"name":"International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115539474","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 experimental study on attitude control of spacecraft using neural networks","authors":"Choong-Seok Oh, Hyunjae Lee, H. Bang","doi":"10.1109/RAST.2003.1303931","DOIUrl":"https://doi.org/10.1109/RAST.2003.1303931","url":null,"abstract":"This primary objective of this study is to demonstrate ground-based experiment for the attitude control of spacecraft. A two-axis rotational simulator with a flexible arm is constructed with on-off air thrusters and reaction wheel as actuation. The simulator is also equipped with payload pointing capability by simultaneous thruster and DC servo motor actuation. The experiment of spacecraft attitude control is performed using the reaction wheel. Using the reaction wheel the performance of the PID and the three proposed neural network controllers is illustrated by simulation and experimental results for a two-axis rotational simulator.","PeriodicalId":272869,"journal":{"name":"International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124162940","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":"Comparison of advanced modulation schemes for LEO satellite downlink communications","authors":"O. Belce","doi":"10.1109/RAST.2003.1303955","DOIUrl":"https://doi.org/10.1109/RAST.2003.1303955","url":null,"abstract":"The M.Sc. degree project, whose one major part is explained in this paper, has been accomplished at the University of Surrey by the financial support of TUBITAK-BILTEN inclusive to the remote sensing satellite project BILSAT-1, which was carried out by Surrey Satellite Technology Limited in UK, collaboration with TUBITAK-BILTEN. This paper explains the methodology and the simulation results of the performances of advanced modulation techniques under the implications of highly dynamic LEO satellite downlink. Modulation schemes that can possibly serve the objectives are the phase shift keying type modulations. Hence, the performance of binary phase shift keying (BPSK), quadriphase shift keying (QPSK), offset QPSK (OQPSK), /spl pi//4 shifted QPSK, octaphase shift keying (8PSK), and 3/spl pi//8 shifted 8PSK have been deeply investigated through simulations considering the LEO satellite communication downlink channel properties. The modulators and demodulators were synthesised using computer programs. The simulations demonstrated the necessity of applying non-coherent demodulators in order to fight with the multipath fading present in the downlink channel. The non-coherent limiter discriminator demodulator of /spl pi//4 shifted QPSK, which turned out to have the best performance in fading simulations, was an evidence of the above observation. 3/spl pi//8 shifted 8PSK was also demodulated with a similar system. However, implementation of 3/spl pi//8 shifted 8PSK is not recommended because of the fact that higher power with respect to /spl pi//4 shifted QPSK modulation is necessary to have identical BER performances. Although the data rate could be increased even more with implementation of 3/spl pi//8 shifted 8PSK than /spl pi//4 shifted QPSK scheme, power limited 'little' LEO satellites prevent using this higher order modulation for downlink.","PeriodicalId":272869,"journal":{"name":"International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of","volume":"178 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124435796","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":"Energetic particle monitoring in space: three-decades of experience at IEPSAS","authors":"K. Kudela, J. Balaz, I. Strhárský","doi":"10.1109/RAST.2003.1303904","DOIUrl":"https://doi.org/10.1109/RAST.2003.1303904","url":null,"abstract":"IEPSAS in Kosice, Slovakia has a long track of experience with the design, construction, testing and operating of energetic particle detectors at low-altitude and high-apogee satellites as well as interplanetary probes during past 30 years. A review of experiments in space and a brief survey of selected results with references is presented. A simple programmable energetic particle detector MEP-1 developed for COMPASS microsatellite is described with more details. The device can be used for both scientific and application tasks at LEO. In addition to the scientific studies of near Earth environment, the experience obtained can be used in the future also for commercial satellites, where relatively simple, monitoring type of devices for measurement of radiation, especially due to the effects of space weather, are of relevance.","PeriodicalId":272869,"journal":{"name":"International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125822032","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}