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

{"title":"BILSAT-1: power system sizing and design","authors":"U. Orlu, G. Yuksel, L. Gomes, K. Hall","doi":"10.1109/RAST.2003.1303900","DOIUrl":"https://doi.org/10.1109/RAST.2003.1303900","url":null,"abstract":"BILSAT-1 is a 129 kg enhanced microsatellite developed by SSTL with TUBITAK-BILTEN engineers as part of a technology transfer programme. The main objective of the mission is remote sensing. The multispectral imager of the satellite has a 26-meter ground sampling distance at 686 km altitude giving a swath width of 55 km and the panchromatic imager of the satellite with 12-meter ground sampling distance gives a 25 km swath width. The satellite has off-axis pointing capability, provided by the ADCS systems, which (amongst other benefits) reduces the revisit time for any given point on the Earth. The advanced and capable Attitude Determination and Control System including star cameras, sun sensors and rate gyros provide accurate and precise attitude information allowing a very high degree of attitude knowledge. Tetrahedral mounted four reaction wheels on board will make the satellite extremely agile, allowing fast slew maneuvers about its roll and pitch axes. On board the satellite there are additional Turkish payloads, including a Digital Signal Processing payload (GEZGIN), and a low-resolution multi spectral camera (COBAN), and SSTL developed payloads: Dual Control Moment Gyros. Due to the large number of subsystems and payloads, the SSTL enhanced microsatellite power system platform is extended to house more than 50 electronic switches to control subsystem and payload operations. Because of the power generation limitations, payload operations are scheduled in order to keep the battery depth of discharge (DoD) at the design level of 15% (which is dictated by the 5+10 years of extended design lifetime of the satellite), although analyses show that the DoD could reach 20% for some particular orbits where intensive operations are required. Several analyses have been done to increase the orbit average power generation and some structural modifications have been made based on the SSTL enhanced microsatellite platform, such as canting the solar panels to maintain energy balance.","PeriodicalId":272869,"journal":{"name":"International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of","volume":"41 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":"123068810","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":"Applying space technologies for human benefit; the Canadian experience and global trends","authors":"R. Mamen","doi":"10.1109/RAST.2003.1303381","DOIUrl":"https://doi.org/10.1109/RAST.2003.1303381","url":null,"abstract":"In the era since Canada followed the Soviet Union and the United States into space, space technology has evolved enormously. No longer the exclusive purview of fully developed countries, space is being harnessed for the benefit of humanity by even small countries and individual establishments. The exploitation of space applications is limited only by the imagination and resolve of the interested parties. Canada's initiation into space took the form of Alouette 1, launched in 1962 to learn more about the physics of electromagnetic phenomena interfering with its radio communications with its northern areas. International collaboration has played an important role and continues to be emphasized as its exploitation of space progressed from science and communications to remote sensing to space robotics. Even today, Canada has declined to develop an independent launch capability, preferring to collaborate with the nations endowed with such a capability. Recent developments in Canada have seen collaboration extend inward, with federal/provincial and private/public sector cooperation on selected space missions. Such collaboration has proven very beneficial to Canada and is recommended globally. Canadian harnessing of space technology began in the domain of communications, moving from R&D into phenomena affecting communications to the world's first domestic geostationary satellite communications system. Today, Canadians have access to not only our own domestic comsats but also international service providers which include Canadian elements. Canadian involvement in space robotics received a big boost with the contribution of the CANADARM to NASA for use on their space shuttles. It grew further with the CANADARM-2 for the International Space Station (ISS), a sophisticated robot which is still evolving, the third main element not yet launched. This arm is available for use by the international partners on the ISS, a major international scientific collaboration.","PeriodicalId":272869,"journal":{"name":"International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of","volume":"2 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":"126151743","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":"Emerging space markets: engines of growth for future space activities","authors":"Kemal Atatiirk","doi":"10.1109/RAST.2003.1303973","DOIUrl":"https://doi.org/10.1109/RAST.2003.1303973","url":null,"abstract":"After a period of downturn, the space industry seems to be poised for another wave of growth in the near future. One of the drivers of this growth will be emerging space markets (markets that are not significant sources of economic activity at present, but those with a big potential for growth). Four such markets are analyzed in this paper: space tourism, on-orbit satellite servicing, microsatellites and global navigation satellite systems. Each of these markets has a unique combination of technologies, potential applications, and sources of demand. The likely evolution of technologies and applications in each market is discussed and a comparative analysis is presented.","PeriodicalId":272869,"journal":{"name":"International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of","volume":"25 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":"126207276","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":"Mach reflection of shock and detonation waves in steady supersonic chemically reacting flows","authors":"A. V. Trotsyuk, A. Kudryavtsev, M. Ivanov","doi":"10.1109/RAST.2003.1303966","DOIUrl":"https://doi.org/10.1109/RAST.2003.1303966","url":null,"abstract":"Numerical simulations have been performed to study regular and Mach reflections of oblique shock waves (SW) in a steady supersonic flow of a homogeneous combustible gas mixture and different inflow Mach numbers M/sub in/. The dynamics of the compressible medium was described by two-dimensional unsteady Euler equations. Chemical transformations in the gas mixture were described by a two-stage reaction model. The resultant hyperbolic system of equations was solved numerically using the finite-volume scheme with the fourth-order MUSCL TVD reconstruction and the advanced HLLC algorithm for an approximate solution of the Riemann problem. Integration in time was performed with a second-order accuracy by using recently developed, additive semi-implicit Runge-Kutta methods. It was found that, as for nonreacting SW, there is a dual solution domain, where the existence of both regular reflection (RR) and Mach reflection (MR) is possible under identical flow parameters and geometry. In the case of the MR, the Mach stem (MS) is a section of the front of an overdriven stationary detonation wave (DW). A hysteresis phenomenon was obtained for a varied wedge angle /spl theta/. The dependence of the Mach stem height on the value of /spl theta/ was found. It was showed that for some values of M/sub in/ there may exist a standing MS with a system of unsteady transverse waves on its front. The flow structure behind the Mach stem is similar to the flow structure behind the front of a multifront (cellular) freely propagating DW. Despite the motion of the transverse shocks along the MS and periodic changes in the stem shape, MS, on the average, is a standing wave that slightly oscillates near some equilibrium point. The effect of an existence of strong transverse waves on the MS front to steadiness of Mach reflection was investigated. The present study showed that the Mach stem height for the case of a chemically reacting mixture is greater than that for an inert mixture. For a model combustible mixture with variable amount of heat release, the dependence of the MS height on chemical reaction heat was found. The present study showed that certain types of local perturbations of the free-stream flow might initiate the transition for RR to MR in the dual-solution domain.","PeriodicalId":272869,"journal":{"name":"International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of","volume":"14 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":"128064314","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":"TerraSAR-X, German X-band remote sensing system","authors":"J. Munder, D. Miller","doi":"10.1109/RAST.2003.1303383","DOIUrl":"https://doi.org/10.1109/RAST.2003.1303383","url":null,"abstract":"TerraSAR-X is the latest development at EADS Astrium GmbH of Synthetic Aperture Radar using an active phased array for spaceborne remote sensing. Its technical implementation is based on core technologies which have been developed and qualified in a demonstrator programme (DESA). New capabilities have been added like full polarimetry and along track interferometry via a Dual Receive Antenna. The programmatic implementation follows a Public Private Partnership (PPP) between the German Aerospace Center, DLR and EADS Astrium GmbH. EADS Astrium is investing into TerraSAR-X to build-up a data service for world wide customers through the founded Infoterra GmbH.","PeriodicalId":272869,"journal":{"name":"International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of","volume":"8 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":"126643970","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":"Image subpixel estimation by evaluation of ON satellite sensor model","authors":"A. Orun","doi":"10.1109/RAST.2003.1303394","DOIUrl":"https://doi.org/10.1109/RAST.2003.1303394","url":null,"abstract":"Mis-registration of ground control points caused by mixed pixels are the most significant error sources in remote sensing. Even though the effects of these errors on land-cover application have been so far widely investigated, no sufficient attention has been given to their impacts on satellite sensor geometry. In this paper the effect of such errors on sensor model accuracy and the possibility of using orbital epipolarity constrains of Orun & Natarajan (ON) satellite sensor model to avoid such errors are investigated.","PeriodicalId":272869,"journal":{"name":"International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of","volume":"216 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":"121544966","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":"The FuegoSat system concept in the context of the GMES initiative","authors":"J. Bequignon","doi":"10.1109/RAST.2003.1303959","DOIUrl":"https://doi.org/10.1109/RAST.2003.1303959","url":null,"abstract":"Europe has proposed a coherent approach in order to bring advances in space technology to environmental security, including management of natural disasters:GMES. The agency's contribution to this effort is the GMES Service Element which, together with the FuegoSat and TerraSAR consolidation phases, form the EarthWatch programme. Objectives are to address simultaneously development of services supporting European policies (forest fire fighting) and space mission issues (FuegoSat) in order to get a sustainable information system based on continuous space information flow. Decisions to fund new missions based on the information needs deriving from European policies, and the proven ability of the European labs and industries to answer to these needs are reviewed.","PeriodicalId":272869,"journal":{"name":"International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of","volume":"690 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":"127493382","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":"2-micron laser development for space-based remote sensing applications","authors":"U. Singh, Jirong Yu","doi":"10.1109/RAST.2003.1303964","DOIUrl":"https://doi.org/10.1109/RAST.2003.1303964","url":null,"abstract":"The design and performance of a diode pumped Tm sensitized Ho:LuLiF/sub 4/ (LuLF) laser oscillator and double-pass Tm:Ho:YLF laser amplifiers are described. The oscillator produced 135-mJ of Q-switched output, which represents a slope efficiency of 0.09. To our knowledge this is the highest Q-switched output for this material. The output energy of double-pass amplifier was improved by 75% compared to single-pass amplifier, and 380-mJ single pulse energy and 630-mJ double pulse energy have been achieved with high efficiency.","PeriodicalId":272869,"journal":{"name":"International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of","volume":"51 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":"132194928","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":"Synthetic aperture radar image processing using cellular neural networks","authors":"S. Kent, O. Ucan, T. Ensari","doi":"10.1109/RAST.2003.1303925","DOIUrl":"https://doi.org/10.1109/RAST.2003.1303925","url":null,"abstract":"In this paper, Cellular Neural Networks (CNNs) have been applied to noisy Synthetic Aperture Radar (SAR) image to improve its performance and appearance. The image has been obtained from Erzurum, Turkey. Because of the importance of imaging quality and appearance for remote sensing applications, CNN has been applied to data for image processing applications that for noise filtering and edge detection. In training, Recurrent Perceptron Learning Algorithm (RPLA) is used as a learning algorithm. According to templates SAR-image has been tested and obtained satisfactory results.","PeriodicalId":272869,"journal":{"name":"International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of","volume":"50 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":"121457141","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":"SIM - a SuFET based induction magnetometer","authors":"Rostyslav Sklyar","doi":"10.1109/RAST.2003.1303907","DOIUrl":"https://doi.org/10.1109/RAST.2003.1303907","url":null,"abstract":"An attempt to generalize the current knowledge of passive magnetic field (MF) transducers - SQUID and induction sensors (IS) (MAFCOPS) - and to incorporate elements of both designs in order to find a way to improve their performance data (PD) by creating, in theory, a combined transducer-superconducting induction magnetometer (SIM). State-of-the-art of IS design is shown with two modifications for application in outer space - LF with sensitivity threshold (ST) 5 pT//spl radic/Hz-5 fT//spl radic/Hz in frequency range (FR) 20 Hz-16 kHz and HF with ST 0.5 pT/spl radic/Hz-1 fT//spl radic/Hz in FR 10 kHz-10 MHz. The superconducting field-effect transistor (SuFET) is incorporated into a wide-band IS device in order to acquire a ST below 1 fT//spl radic/Hz in the FR from small values of hertz to tens of MHz (0.1-10/sup 7/ Hz). The proposed magnetometer circuit consists of both room-temperature or cooled (up to superconductive) pickup coil (PC) and a SuFET. Both the TF and the ST for SIM are analytically investigated proceeding from the equivalent and noise circuit respectively. The sensitivity improvement of some SIM variants is shown in comparison with other state-of-the-art MAFCOPS. Constructional and operational distinctions of the designed sensor are explained.","PeriodicalId":272869,"journal":{"name":"International Conference on Recent Advances in Space Technologies, 2003. RAST '03. Proceedings of","volume":"3 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":"125392938","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}