Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011最新文献_第9页

GIS applications in cloud computing platform and recent advances GIS在云计算平台中的应用及最新进展

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966820

A. Aysan, Hikmet Yigit, G. Yilmaz

引用次数: 4

Distributed simulator design by using of SimNetwork to overcome speed limit on GenSim 利用SimNetwork设计分布式仿真器，克服GenSim的速度限制

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966872

Cheol-hea Koo, Hoon-Hee Lee, Yee-Jin Cheon

引用次数: 5

Design and study of dielectric double chirped mirrors in ultra short femtosecond pulse lasers 超短飞秒脉冲激光器中介质双啁啾反射镜的设计与研究

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966910

Amal Mohammed Ali Al-Hillou, E. Mohammad

引用次数: 1

Quasi-equilibrium glide auto-adaptive entry guidance based on ideology of predictor-corrector 基于预测校正思想的准平衡滑翔自适应进入制导

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966837

Mingliang Xu, Luhua Liu, G. Tang, Ke-jun Chen

{"title":"Quasi-equilibrium glide auto-adaptive entry guidance based on ideology of predictor-corrector","authors":"Mingliang Xu, Luhua Liu, G. Tang, Ke-jun Chen","doi":"10.1109/RAST.2011.5966837","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966837","url":null,"abstract":"A novel quasi-equilibrium glide auto-adaptive guidance algorithm based on ideology of predictor-corrector is proposed for high lifting entry vehicle. The quasi-equilibrium glide condition based on constant flight path angle is adopted. The vehicle heading is adjusted to firing plane using lateral guidance logic firstly, and then the range-to-go is calculated from the terminal position constraint. The needed flight path angle is calculated based on the range-to-go using the analytical relationship between range and flight path angle. The angle of attack is adjusted to control the trajectory to satisfy the quasi-equilibrium glide condition with the needed flight path angle. By the means, the quasi-equilibrium glide auto-adaptive guidance which meets the terminal position constraints is achieved. For the situation with terminal velocity constraint, the control variable bank angle is corrected according to the difference between the expected and predicted terminal velocity which is acquired analytically in each guidance period. The guidance algorithm is validated via a three-dimensional trajectory guidance simulation which results indicate that the quasi-equilibrium glide auto-adaptive guidance performs well.","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":"129710546","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: 2

Determination of optimum STC orientation by GA 遗传算法确定最佳STC取向

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966824

O. Bettemir

{"title":"Determination of optimum STC orientation by GA","authors":"O. Bettemir","doi":"10.1109/RAST.2011.5966824","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966824","url":null,"abstract":"Optimum orientation of star tracker, which minimizes the precision of georeferencing without ground control points is searched. The study aims to obtain the best orientation of STC that minimizes the uncertainty of georeferencing. Precision of georeferencing is estimated by Differential Sensitivity Analysis (DSA) based on partial derivatives of input parameters which contains certain amount of uncertainty. Uncertainties of interior camera parameters, camera position, image timing and digital elevation model (DEM) are included in the precision estimation procedure of the georeferencing. Uncertainties of these parameters are assumed to be normally distributed and the confidence interval for the input parameters are obtained from the manufacturers and the vendors. Orbit of BilSAT on the 3rd of August 2005 is used for the optimization analysis. Interior camera parameters are assigned in reasonable ranges for a small satellite. Analysis are conducted for the imaging geometry of 0°, 5°, 10°, 15°, and 20° cross-track rotations of the camera with respect to body fixed reference system of the satellite. Sum of the obtained georeferencing precisions is considered as the objective function to be minimized. Optimization procedure searches the optimum solution in the plane of two variables; pitch and yaw angles of the STC with respect to body fixed reference system of the satellite. Genetic Algorithm (GA) is implemented for the search of the optimum solution.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"15 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":"124608494","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: 1

Communication subsystem of RASAT RASAT通信子系统

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966983

Dilsad Icoz, N. D. Kahyaoglu, Muhsin Bolucek, Emrah Oncu, Tunahan Kirilmaz, C. Dudak, H. Sunay, V. Akan, O. Sen

引用次数: 7

Potential of multi-look SAR processing 多视SAR处理的潜力

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966857

D. Vavriv, O. Bezvesilniy

引用次数: 6

Road detection from remotely sensed images using color features 基于彩色特征的遥感图像道路检测

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966802

B. Sirmaçek, C. Unsalan

{"title":"Road detection from remotely sensed images using color features","authors":"B. Sirmaçek, C. Unsalan","doi":"10.1109/RAST.2011.5966802","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966802","url":null,"abstract":"Urban regions are dynamic environments. Especially their road maps change by the expansion of the urban region. Therefore, automatic detection of roads from very high resolution aerial and satellite images is a very important research field. Unfortunately, the solution is not straightforward by using basic image processing and computer vision algorithms. Therefore, advanced methods are needed for road network detection from aerial and satellite images. In this study, we propose a novel method for automatic detection of road segments from very high resolution color aerial and satellite images. Our method depends on choosing a training set from the input image manually. We use color chroma values of pixels as the discriminative features. Since road pixels have similar color characteristics, the distribution of color chroma feature values of the training region have a peak at a certain point in the feature space which shows the road class. Using this information and one-class classification methodology, we label road segments in a given remotely sensed image. Finally, we fit a road network shape on the detected segment. Experimental results on color aerial and Ikonos satellite images show the importance of color features in road detection applications.","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":"130664625","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: 10

A decentralized design philosophy for satellites 分散的卫星设计理念

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966896

J. Nielsen, J. A. Larsen

引用次数: 6

NERVA rocket trajectory corridor over black Sea 黑海上空的NERVA火箭轨迹走廊

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966924

R. Rugescu, C. Constantinescu, M.Al. Barbelian, Seyed Mohamadreza Mahmoudian

{"title":"NERVA rocket trajectory corridor over black Sea","authors":"R. Rugescu, C. Constantinescu, M.Al. Barbelian, Seyed Mohamadreza Mahmoudian","doi":"10.1109/RAST.2011.5966924","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966924","url":null,"abstract":"The constraints during the atmospheric ascent of the small NERVA rocket launcher are investigated, especially in regard to the limited flight envelope and mass optimization requirements. The usual flight ascent optimization faces in this case additional constraints, which must be solved with minimum losses of mass efficiency of the vehicle. A methodology of investigating the best ascent control laws is presented with emphasize on the second stage of the vehicle, regarding both the gas-dynamic controller system of the control unit and the accuracy of the inertial sensors of the self-guidance onboard system. The methodology is also focused on accommodating the high orbital insertion requirements of the gravity turn trajectory with a low-cost, highly secure flight controller system. Minimum technological modifications of the existing rocket propulsion system of the second stage are considered, which is a typical liquid propellant stage with aerodynamic and gas-dynamic attitude controls. Possible technological solutions are analyzed and compared regarding the accessibility of the ascent trajectories and optimal constrained solutions to the safety problem. The constraints are of safety, technological and international nature.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"11 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":"123940447","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: 1