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

Ionospheric effects preceded the October 2003 Halloween storm 电离层效应早于2003年10月的万圣节风暴

Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005. Pub Date : 2005-06-09 DOI: 10.1109/RAST.2005.1512667

D. Blagoveshchensky, J. MacDougall, A. V. Pyatkova

{"title":"Ionospheric effects preceded the October 2003 Halloween storm","authors":"D. Blagoveshchensky, J. MacDougall, A. V. Pyatkova","doi":"10.1109/RAST.2005.1512667","DOIUrl":"https://doi.org/10.1109/RAST.2005.1512667","url":null,"abstract":"The goal of this study is to reveal some ionospheric forerunners which occur prior to the expansion phase of any storm or substorm. Another task is to compare variations of two main ionospheric parameters, f/sub 0/F2 and h/sub max/F2, on two chains of ionosondes located in Europe and North America during the interval October 16-28, 2003. This interval precedes the Halloween storm and includes its onset. Analysis is based on ionospheric data of the SPIDR system. The key findings are as follows. A positive peak of delta f/sub 0/F2 occurs some hours before onset of a magnetic storm or substorm, where delta is a deviation from the quiet value. This peak can serve as a forerunner of disturbance development. Delta f/sub 0/F2 peak amplitude reaches the sizes 20-100% of f/sub 0/F2 values. Similarities of delta f/sub 0/F2 variations on two chains are: (i) the delta f/sub 0/F2 peak mentioned above occurs simultaneously as a rule before disturbances on both chains; (ii) similar delta f/sub 0/F2 variations are observed on all of the mid-latitude (or high-latitude) ionosondes of each of the chain. Delta h/sub max/F2 variations are approximately the opposite of the f/sub 0/F2 variations. Their amplitudes fall in the range 15 - 25% from the average h/sub max/F2 value. This investigation is useful and important for the short-term prediction of space weather states.","PeriodicalId":156704,"journal":{"name":"Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005.","volume":"73 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":"115144583","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}

引用次数: 0

Microwave power transmission system with phase and amplitude controlled magnetrons 具有相位和幅度控制磁控管的微波功率传输系统

Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005. Pub Date : 2005-06-09 DOI: 10.1109/RAST.2005.1512529

N. Shinohara, H. Matsumoto

引用次数: 15

Autonomous onboard computer systems using real time trace models 使用实时跟踪模型的自主机载计算机系统

Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005. Pub Date : 2005-06-09 DOI: 10.1109/RAST.2005.1512560

P. Hristov, P. Angelov, M. Gousheva

{"title":"Autonomous onboard computer systems using real time trace models","authors":"P. Hristov, P. Angelov, M. Gousheva","doi":"10.1109/RAST.2005.1512560","DOIUrl":"https://doi.org/10.1109/RAST.2005.1512560","url":null,"abstract":"In the paper some particularities of the autonomous spacecraft computer systems are discussed. The ways to reach the autonomy are described - high reliability and adaptability of the system, reached by application of AI elements formal structural models (specification, verification and real time control) and dynamic reconfiguration. A method using trace models In real time for testing of system operations is described. The method is suitable for systems specified by process algebras (CSP - Communicating Sequential Processes, Timed CSP, ASM - Abstract State Machine, and TAM - Temporal Agent Model) where process tracts are used. The computing processes and these in the hardware are observed. Special control processes (tracers) are specified. They allow to control in real time the correspondence of the real system traces and preliminary computed traces (the formal specification) and send messages to the other subsystems when no correspondence (e.g. to specification and dynamic reconfiguration subsystems). The method allows finding in real, time the software and hardware incorrectly functioning (disparity of the traces) based on rigorous mathematical specification. In the paper are described: an autonomous control system structural model, an algorithm for real time traces control, software simulations (laboratory models) of autonomous systems, the faults and reaction of the tracer-processes, all based on CPPCSP - C++ Communicating Sequential Processes library. The application of trace models in real time allows find any system incorrectly operating and this is one of the ways for,increasing the onboard computer systeme reliability and to achieve full operation autonomy.","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":"116943810","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}

引用次数: 0

The SSETI-Express mission: from idea to launch in one and a half year SSETI-Express任务:从想法到发射用了一年半

Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005. Pub Date : 2005-06-09 DOI: 10.1109/RAST.2005.1512543

Lars Alminde y, Morten Bisgaard y, Neil Melville z, Jorg Schaefer y

引用次数: 11

Toward the radiation belt forecast in Japan 日本辐射带预测

Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005. Pub Date : 2005-06-09 DOI: 10.1109/RAST.2005.1512531

T. Obara, T. Goka, H. Matsumoto

引用次数: 0

Indication of geohazard risk and economic value of gypsum deposits in the Tertiary Sivas Basin (Turkey) using ASTER and Landsat ETM+ images 利用ASTER和Landsat ETM+图像对土耳其第三纪锡瓦斯盆地石膏矿床地质灾害风险和经济价值的指示

Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005. Pub Date : 2005-06-09 DOI: 10.1109/RAST.2005.1512633

K. S. Kavak

{"title":"Indication of geohazard risk and economic value of gypsum deposits in the Tertiary Sivas Basin (Turkey) using ASTER and Landsat ETM+ images","authors":"K. S. Kavak","doi":"10.1109/RAST.2005.1512633","DOIUrl":"https://doi.org/10.1109/RAST.2005.1512633","url":null,"abstract":"The Tertiary Sivas Basin contains widespread, tectonically deformed deposits of massive Oligocene gypsum. This unit is one of the most important factors controlling the tectono-stratigraphic evolution of the basin insofar as these deposits are interpreted as decollement levels. Sivas Basin also has remarkable structural expressions within these evaporite deposits, as seen in satellite images aided by colour composites. Because of the arid climatic conditions of the region, the basin provides ease of interpretation geologically in terms of the synoptic-view capability of broad-band multispectral data sets, such as ASTER and Landsat ETM+. In this study, data fusion and decorrelation stretching methods were applied to highlight Oligocene gypsum deposits of the basin. These continental deposits host celestite and barite mineralization of great industrial importance. These gypsum deposits also carry a geohazard impact, namely their propensity to lead to collapses, particularly on the eastern side of the city of Sivas. Because the present study aids in the discrimination of these gypsum occurrences from other geological units, it may also lead to geohazard-risk reduction.","PeriodicalId":156704,"journal":{"name":"Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005.","volume":"43 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":"125589277","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}

引用次数: 0

Optimum lunar and Martian structures and their construction 月球和火星的最佳结构及其构造

Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005. Pub Date : 2005-06-09 DOI: 10.1109/RAST.2005.1512573

Y. C. Toklu

{"title":"Optimum lunar and Martian structures and their construction","authors":"Y. C. Toklu","doi":"10.1109/RAST.2005.1512573","DOIUrl":"https://doi.org/10.1109/RAST.2005.1512573","url":null,"abstract":"Conditions on the Moon and Mars are very different from those prevailing on the Earth as far as design and construction of lunar and Martian habitats or stations are considered. Gravity on the Mars is about 1/3 of that on the Earth, and about 1/6 on the Moon. There is no atmosphere on the Moon, and it is minimal on the Mars. The radiation is much above the level that human beings or other living organisms can support. Daily temperature fluctuations are much above the levels accustomed. Supply of raw or manufactured materials is very difficult and expensive. These conditions and others bring in very important constraints on the types and constructional techniques to be used. Inner pressure to be provided within structures imposes spherical, toroidal or cylindrical shaped buildings. The need for protection against radiation favors underground, buried or covered structures. Lack of atmosphere and high level of radiation necessitates an advanced level of automatization using robots and tele-operated construction activities. Difficulty and high cost of supplying materials from the Earth increases the feasibility of using local materials. In addition, a high level of security is required under these hostile conditions and all operations must be optimized because of the extremely high level of costs and difficulties.","PeriodicalId":156704,"journal":{"name":"Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005.","volume":"477 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":"116519932","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}

引用次数: 6

Design and experiment on small satellite formation flying simulation platform 小卫星编队飞行仿真平台的设计与实验

Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005. Pub Date : 2005-06-09 DOI: 10.1109/RAST.2005.1512570

Li Bin, You Zheng, Zhang Chenguang, Z. Xiaomin

{"title":"Design and experiment on small satellite formation flying simulation platform","authors":"Li Bin, You Zheng, Zhang Chenguang, Z. Xiaomin","doi":"10.1109/RAST.2005.1512570","DOIUrl":"https://doi.org/10.1109/RAST.2005.1512570","url":null,"abstract":"Small Satellite Formation Flying (SSFF) simulation system can reveal many problems during the system design of SSFF. It will also finger out how to improve the whole system, which will make SSFF much more reliable. In this paper, a Small Satellite Formation Flying Simulation Platform (SSFFSP) is established, on which many components and devices of satellite can be tested and verified. The SSFFSP is made up of several simulative satellites and one control center. Each simulative satellite consists of several kinds of sensors and actuators, which are either physical or simulated. Five running modes are given for the formation flying control. Simulative satellites communicate with each other through the inter-satellite network. An inter-satellite network with rive layers is established and protocols are designed to meet the needs of SSFF. The inter-satellite network can support formation control, states measurement, operation of riles, operation of space missions, program uploading and updating, and network management. The SSFFSP is applied to some projects and experiments. Simulations and experiments on relative distance measurement of satellites based on GPS are given.","PeriodicalId":156704,"journal":{"name":"Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005.","volume":"53 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114042220","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}

引用次数: 0

Trajectory optimization of advanced launch system 先进发射系统弹道优化

Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005. Pub Date : 2005-06-09 DOI: 10.1109/RAST.2005.1512595

Gizem Karsli, Uzan TEKtNALP

引用次数: 9

DEM generation and accuracy assessment from stereo ASTER imagery 立体ASTER影像DEM生成及精度评估

Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005. Pub Date : 2005-06-09 DOI: 10.1109/RAST.2005.1512624

A. Ok, M. Turker

{"title":"DEM generation and accuracy assessment from stereo ASTER imagery","authors":"A. Ok, M. Turker","doi":"10.1109/RAST.2005.1512624","DOIUrl":"https://doi.org/10.1109/RAST.2005.1512624","url":null,"abstract":"In this study, Digital Elevation Models (DEMs) were generated from ASTER stereo images for a study area enclosing the city of Ankara and covering an area of 3600 km/sup 2/. Majority of the area was covered by large scale orthophotos, which were used as the main source to collect the Ground Control Points (GCPs). For those areas that were not covered by the orthophotos the GCPs were collected through a differential GPS. The bundle adjustment process and the generation of DEMs were carried out using PCI Geomatica image analysis software. In order to find the best GCP combination, DEMs were generated using different number of GCPs (8, 16, 24 and 32). DEM accuracies were assessed based on different parameters including the check points, slopes and land cover types. The accuracies of the resulting DEMs revealed that 16 GCPs were good compromise to produce the most accurate DEM. It was found that the post processing and blunder removal were crucial stages that affect the overall DEM accuracy up to 38%. There was a strong linear relationship between the accuracy of DEMs and the terrain slopes. For urban and forested areas, the accuracy in elevation was found to be 8.03 m and 12.69 m, respectively. The overall accuracy computed for 2,171,664 points produced 10.92 m elevation accuracy.","PeriodicalId":156704,"journal":{"name":"Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005.","volume":"675 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":"126445677","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}

引用次数: 3