Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005.最新文献

{"title":"International, interdisciplinary, and intercultural space education through ISU team projects","authors":"J. O'rourke, S. Podhajsky","doi":"10.1109/RAST.2005.1512534","DOIUrl":"https://doi.org/10.1109/RAST.2005.1512534","url":null,"abstract":"The International Space University (ISU) was created to deliver graduate-level education, training and development for young professionals in the space and satellite sector, both at its central campus in Strasbourg, France and at locations around the world. In its two-month summer session programme (SSP) and one-year Master of Space Studies (MSS) as well as the Master of Space Management (MSM), ISU not only offers its students a unique curriculum covering all disciplines related to space programmes and enterprises (space science, space engineering, systems engineering, space policy and law, business and management, and space and society), but does so in an international, interdisciplinary and intercultural (3I) context. An essential component of both the MSS and SSP programmes are the team projects. In these, ISU students are given the opportunity to solve complex problems together in an active 3I environment. The paper, written in the 3I spirit by a lawyer and an engineer (graduates of SSP2003 and SSP2004 respectively), outlines ISU and its programmes, explains the importance of the 3I approach, describes the implementation of 3I through the team project process, illustrates the authors' own experience of ISU programmes and team projects and assesses the benefits accrued.","PeriodicalId":156704,"journal":{"name":"Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005.","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125745671","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":"Investigations of some human physiological parameters in relation to geomagnetic variations of solar origin and meteorological factors","authors":"S. Dimitrova","doi":"10.1109/RAST.2005.1512663","DOIUrl":"https://doi.org/10.1109/RAST.2005.1512663","url":null,"abstract":"A group of 86 healthy volunteers was examined on working days in autumn 2001 and in spring 2002. These periods were chosen because of maximal expected geomagnetic activity. Systolic and diastolic blood pressure and heart rate were measured. Pulse pressure was calculated. Data about general well-being of persons were gathered. Altogether 2799 recordings were obtained and analysed. MANOVA was employed to check the significance of the influence of three factors on the physiological parameters under consideration. The factors were as follows: 1) planetary geomagnetic activity level estimated by Ap-index and divided into five levels; 2) gender - males and females; 3) the presence of medication. Post hoc analysis was performed to elicit the significance of differences in the factors' levels. Arterial blood pressure, pulse pressure and subjective psycho-physiological complaints were found to increase with the increase of geomagnetic activity level. Results obtained suggest that females and persons on a medication are more sensitive to geomagnetic activity increment in comparison with respectively males and persons not taking medicaments. Additionally ANOVA was employed to check the significance of the influence of some meteorological elements on the physiological parameters examined. Results revealed that the influence of meteorological factors is less biologically effective than the influence of geomagnetic activity.","PeriodicalId":156704,"journal":{"name":"Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130249133","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":"Tide normalized change detection using multitemporal satellite imagery to decipher the turtle rookery dynamics of Gahirmatha, India","authors":"G. Prusty, S. Dash, S. Prasad","doi":"10.1109/RAST.2005.1512631","DOIUrl":"https://doi.org/10.1109/RAST.2005.1512631","url":null,"abstract":"A GIS based tide normalized change detection method is developed and tested for analyzing multi-temporal satellite imagery to decipher the morphological change pattern of the two major Olive Ridley sea turtle nesting landforms, namely Ekakula spit and Nasi sandbar situated in the Gahirmatha coast, India. The shoreline position of the coastal landforms at the time of satellite capture is variable as it is dependent on the dynamic nature of the tidal conditions. To normalize the tidal effect, reference Digital Elevation Models (DEM) were constructed from seven-change position of the shoreline, derived from the satellite images sampled between Dec'98 and March'99 under varied tidal conditions. According to the associated tidal levels of the historical images, the corresponding Reference shorelines were extracted from the constructed DEM for quantitative estimation of change in surface area. The methodology has recorded an error up to 4% in the self-consistency check. The ephemeral nature of the rookery was deciphered from the change computation of surface area from the 25 historical images sampled between the years 1988 and 2004 and demonstrated that the geomorphological characteristic of the rookery is one of the major deciding factors for the mass-nesting of the turtles.","PeriodicalId":156704,"journal":{"name":"Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005.","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134220029","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":"Classification of remote sensing data by multistage self-organizing maps with rejection schemes","authors":"J. Lee, O. Ersoy","doi":"10.1109/RAST.2005.1512626","DOIUrl":"https://doi.org/10.1109/RAST.2005.1512626","url":null,"abstract":"A new classification method for remote sensing data is proposed. The proposed classifier consists of several stage neural networks (SNN) and rejection schemes. Rejection schemes are used to decide whether the input vector is hard to classify. By adopting rejection schemes, it is possible to detect the hard input vectors and reduce the possibility of misclassification, for example, due to input vectors which are linearly non-separable or close to boundaries between classes. Such input vectors are rejected by rejection schemes in each SNN and fed into the next SNN. Simultaneously, the input vectors accepted by rejection schemes are classified in each SNN. The self-organizing map (SOM) is used for learning of weight vectors. Experiments are done using the proposed method with two remote sensing data sets, and results are compared to those of other methods.","PeriodicalId":156704,"journal":{"name":"Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130816301","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":"Measurement of Earth electric potentials and ULF signals for seeking earthquake precursors","authors":"B. Boytchev, P. Nenovski","doi":"10.1109/RAST.2005.1512687","DOIUrl":"https://doi.org/10.1109/RAST.2005.1512687","url":null,"abstract":"Measurements of the Earth electric potential (EEP) and electromagnetic field complement existing facilities for studying various kinds of geodynamical formation and phenomena. An apparatus for electrotelluric field measurements in the ULF range is suggested. This apparatus constitutes a system for multipoint measurements. Such measurements appear to be a principal element of programmes toward seeking electromagnetic precursors of earthquakes. First results on anomalous electrotelluric signals prior to great earthquakes are illustrated.","PeriodicalId":156704,"journal":{"name":"Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005.","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124317033","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 ground-based orbit determination for BILSAT","authors":"M. O. Karslioglu, J. Friedrich, H. Urhan","doi":"10.1109/RAST.2005.1512553","DOIUrl":"https://doi.org/10.1109/RAST.2005.1512553","url":null,"abstract":"This paper describes a ground-based orbit determination algorithm for the remote sensing satellite BILSAT. A near-real time quality control of orbit data In the ground station is of vital importance to detect outliers or to bridge data gaps where position information is not available. These might result both from possible temporary mal-functioning and intermittently on/off switching of the onboard GPS receiver. A dynamic approach is preferred for the orbit determination because it includes not only outlier's detection or bridging of data gaps without GPS observations but also rigorous modeling of relevant forces with a better model accuracy, reliable velocity information of the space craft and direct estimation of other Important parameters like atmospheric drag or radiation pressure coefficients. Such an algorithm provides continuous Improved orbit Information on the basis of force models and space-borne GPS position fixes as observations. In context with the dynamic model a best fitting orbit for BILSAT is then achieved by using a univariate Gauss-Markoff model as the estimation procedure so that Improved orbit information In terms of Cartesian coordinates with respect to WGS 84 can be provided.","PeriodicalId":156704,"journal":{"name":"Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005.","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114500379","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":"Experiment for radiation dose measurements in a human phantom onboard the ISS for estimation of the radiation risk in long duration space flights","authors":"J. Semkova, R. Koleva, G. Todorova, N. Kanchev, V. Petrov, V. Shurshakov, E. Yarmanova, V. Benghin, I. Tchhernykh","doi":"10.1109/RAST.2005.1512664","DOIUrl":"https://doi.org/10.1109/RAST.2005.1512664","url":null,"abstract":"Radiation exposure of crewmembers on manned space flight has been recognised as an important factor in the planning and design of such missions. Indeed, the effects of ionising radiation on crew health, performance and life expectancy are a limitation to the duration of man's sojourn in space. Predicting the effects of radiation on humans during a long-term space mission requires: i) accurate knowledge and modeling of the space radiation environment; ii) calculation of primary and secondary particle transport through shielding materials and though the human body; and iii) assessment of the biological effect of cosmic particles, especially highly energetic particles in the heavy ion component (HZE particles). The International Space Station (ISS) internal radiation environment is complex, with incident external space radiation field modulated by widely varying amounts of shielding and internal material, including the astronaut's bodies. For the estimation of the organ doses, and thus the radiation risk, measurements in human phantoms are essential. In the present paper the dosimetric telescope Liulin-5 developed for investigation of the radiation environment dynamics within the Russian spherical tissue-equivalent phantom on ISS is presented. Described are the measurement method, the functional requirements to the instrumentation and the technical specifications. Liulin-5 experiment is an adherent part of the international project MATROSHKA-R on ISS. The MATROSHKA-R project, launched in 2004, is aimed to study the radiation doses distribution at the sites of critical organs of the human body, using models of human body anthropomorphic and spherical tissue-equivalent phantoms. The aim of Liulin-5 experiment is long term investigation of the depth-dose distribution inside the spherical tissue-equivalent phantom, mounted in different places of the Russian Segment of ISS. Energy deposition spectra, linear energy transfer (LET) spectra, flux and absorbed dose rates for protons and the biologically-relevant heavy ion components of the cosmic radiation will be measured simultaneously with near real time resolution at different depths of the phantom's radial channel. Dose equivalent rates at these depths will be calculated from the absorbed dose rates multiplied by quality factor Q(LET). The doses in intermediate points will be determined by interpolation. Data obtained together with data from other active and passive dosimeters will be used to estimate the radiation risk to the crewmembers, verify the models of radiation environment, validate body transport model and correlate organ level dose to skin dose. Liulin-5 is planned to be flown on the ISS in 2006 year. Modifications of the Liulin-5 instrument for radiation monitoring outside the phantom are under development. Discussed are the possibilities analogues of these techniques to be used for investigation of the radiation hazards during future exploratory unmanned interplanetary missions, as well as a","PeriodicalId":156704,"journal":{"name":"Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005.","volume":"195 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114951893","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":"Geometric evaluation, automated DEM and orthoimage generation from along-track stereo ASTER images","authors":"A. Marangoz, G. Buyuksalih, I. Buyuksalih, U. Sefercik, H. Akcin","doi":"10.1109/RAST.2005.1512621","DOIUrl":"https://doi.org/10.1109/RAST.2005.1512621","url":null,"abstract":"A cloud-free ASTER scene combination covering 61.5km /spl times/ 63km Zonguldak testfield in the north-west Turkey has been analysed. It comprises the nadir and backward views with a base-to-height ratio of 0.6. The pixel size on the ground is 15m. The bundle orientation was executed with the related module of PCI Geomatica V9.1.4 software package and resulted the 3D geo-positioning to an accuracy of about 14m in planimetry and 13m in height. This level of accuracy can be provided using the number of GCPs up to 14 which are distributed over the scene uniformly. Based on the scene orientation, a DEM of the area has been determined by an automatic image matching and PCI system yielded a DEM with 30m cell size. For the validation of extracted DEM, different groups of GCPs selected over the testfield were utilized. In this analysis, GCPs were located in the raster DEM in according to their planimetric coordinates, then the heights are estimated by the bilinear interpolation of the neighboured grid cells. This was done by the program DEMINT and mean square differences was obtained in the range of 12 to 14m. Moreover, matched DEM was checked against reference DEM based on digitised contour lines from the 1:25000 scale topographic maps using program DEMANAL. The discrepancies between the two DEMs were determined as reference DEM minus matched DEM. Then positive biases resulted which show that matched DEM occurred under the reference DEM. These biases appeared also in the superimposition of contours from two DEMs. Image of DZ discrepancies is displayed as a function of grey values as well and highest residuals occurred mainly at the ridges. In the meantime, RMSE-Z from the comparison of both DEMs obtained very close in the range of /spl plusmn/21-22m. Finally, orthoimage was generated using matched DEM and nadir image component of ASTER stereopair without problem. Planimetric accuracy check of this product was realized using the GCPs and shows no systematic error pattern overall.","PeriodicalId":156704,"journal":{"name":"Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005.","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116370298","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 low power hollow thruster for orbit correction system for small, mini and micro satellites","authors":"T. Maksymenko, A. Loyan, N. Koshelev","doi":"10.1109/RAST.2005.1512590","DOIUrl":"https://doi.org/10.1109/RAST.2005.1512590","url":null,"abstract":"In this article problem of low-power SPT development actualite is considered. The main requirements for this thruster class are represented. Some methods of low-power Hall thruster developing and their advantages and disadvantage. The test results and main parameters of new law-power thruster laboratory model SPT-20M are represented. Comparative characteristics of SPT model and law power hollow thrusters developed by leading world specialists is shown.","PeriodicalId":156704,"journal":{"name":"Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005.","volume":"55 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121958735","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":"Time - frequency analysis of radar signals for ISAR applications","authors":"K. Skrapas, G. Boultadakis, A. Karakasiliotis, P. Frangos","doi":"10.1109/RAST.2005.1512657","DOIUrl":"https://doi.org/10.1109/RAST.2005.1512657","url":null,"abstract":"Time - frequency analysis is nowadays very frequently used for the evaluation of non - stationary signals, with applications in areas such as radar target imaging and identification, seismic signal interpretation etc. The corresponding two - dimensional (2D) time - frequency plots, usually called 'spectrograms', are sometimes very useful, because they provide the time - dependence of the signal spectrum, not available in other traditional spectrum estimation methods. In this paper we focus on several time frequency techniques, like the Short - Time Fourier Transform (STFT). Furthermore, the performance of the Bilinear Time - Frequency Transforms is also carefully examined. The basic idea of time - frequency analysis is the characterization of the time-varying frequency content of a signal. In this way, additional signal information can be acquired, and ultimately improved target image resolution can be achieved. Finally, time - frequency transforms allow the use of variable parameters, which change according to the time and frequency, in order to achieve the desired target resolution. In this paper, we develop computer codes for the above methods, and simulated synthetic radar data are used for their implementation.","PeriodicalId":156704,"journal":{"name":"Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005.","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128678624","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}