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2017 8th International Conference on Recent Advances in Space Technologies (RAST)最新文献

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Terrain estimation performance of advanced SAR satellites: Cosmo-SkyMed and TerraSAR-X 先进SAR卫星的地形估计性能:cosmos - skymed和TerraSAR-X
2017 8th International Conference on Recent Advances in Space Technologies (RAST) Pub Date : 2017-06-01 DOI: 10.1109/RAST.2017.8003006
U. Sefercik, N. Yastikli, C. Atalay
{"title":"Terrain estimation performance of advanced SAR satellites: Cosmo-SkyMed and TerraSAR-X","authors":"U. Sefercik, N. Yastikli, C. Atalay","doi":"10.1109/RAST.2017.8003006","DOIUrl":"https://doi.org/10.1109/RAST.2017.8003006","url":null,"abstract":"Presently, Cosmo-SkyMed (CSK) and TerraSAR-X (TSX) are the most advanced synthetic aperture radar (SAR) satellites which offer highest spatial resolution that could not be achieved from previous spaceborne SAR missions. In addition to high spatial resolution both of them are capable of repeat-pass interferometry that makes possible three dimensional digital modelling of visible earth surface from space. In this study, digital earth modelling performance of CSK and TSX high resolution spotlight (HS) images is comprehensively analyzed regarding absolute and relative vertical accuracies of generated digital surface models (DSMs). Accuracies were calculated on different land classes in Istanbul using a reference DSM derived by airborne laser scanning (ALS). Compatible results were achieved for CSK and TSX in open, built-up, and forest land classes. The absolute vertical accuracies are between 8 m and 10 m considering standard deviation. The relative vertical accuracies are superior to absolute both for CSK and TSX as expected from active sensing.","PeriodicalId":434418,"journal":{"name":"2017 8th International Conference on Recent Advances in Space Technologies (RAST)","volume":"190 1-4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134289372","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
A study on the local shielding protection of electronic components in space radiation environment 空间辐射环境中电子元件局部屏蔽保护的研究
2017 8th International Conference on Recent Advances in Space Technologies (RAST) Pub Date : 2017-06-01 DOI: 10.1109/RAST.2017.8003007
R. Uzel, A. Özyildirim
{"title":"A study on the local shielding protection of electronic components in space radiation environment","authors":"R. Uzel, A. Özyildirim","doi":"10.1109/RAST.2017.8003007","DOIUrl":"https://doi.org/10.1109/RAST.2017.8003007","url":null,"abstract":"In this paper, we investigated the efficiency of local shielding structures against trapped particles, galactic cosmic rays and solar particles to meet mission reliability objectives considering also mass and volume optimization. The local shielding applications using high-Z materials are also investigated for total ionizing dose levels and internal charging characteristics with 3D radiation analysis.","PeriodicalId":434418,"journal":{"name":"2017 8th International Conference on Recent Advances in Space Technologies (RAST)","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130873786","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
Accuracy assessment of digital elevation models obtained from different data and methods 基于不同数据和方法的数字高程模型精度评价
2017 8th International Conference on Recent Advances in Space Technologies (RAST) Pub Date : 2017-06-01 DOI: 10.1109/RAST.2017.8002942
Beril Varol, A. Tuzcu, Elif Ozlem Yilmaz, Derya Maktav, S. Bayburt
{"title":"Accuracy assessment of digital elevation models obtained from different data and methods","authors":"Beril Varol, A. Tuzcu, Elif Ozlem Yilmaz, Derya Maktav, S. Bayburt","doi":"10.1109/RAST.2017.8002942","DOIUrl":"https://doi.org/10.1109/RAST.2017.8002942","url":null,"abstract":"Digital elevation model (DEM) is primarily a way of visualising 2D maps, photographs and images in 3D. Common uses of DEMs are creation of relief maps, rendering of 3D visualizations, rectification of satellites images and aerial photographs, creation of different physical models, etc. DEMs can be produced by different methods. In this study, DEMs are produced by 1:25000 digital topographic maps, Light Detection and Ranging (LIDAR) data, Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and Shuttle Radar Topographic Mission (SRTM) data, and the accuracy of these models are analysed.","PeriodicalId":434418,"journal":{"name":"2017 8th International Conference on Recent Advances in Space Technologies (RAST)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131146520","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
Mathematical modeling of solar sail spacecraft guidance by considering the form of surface 考虑曲面形式的太阳帆航天器制导数学建模
2017 8th International Conference on Recent Advances in Space Technologies (RAST) Pub Date : 2017-06-01 DOI: 10.1109/RAST.2017.8003002
O. Starinova, I. Gorbunova, A. S. Chekashov, A. Bakhyt
{"title":"Mathematical modeling of solar sail spacecraft guidance by considering the form of surface","authors":"O. Starinova, I. Gorbunova, A. S. Chekashov, A. Bakhyt","doi":"10.1109/RAST.2017.8003002","DOIUrl":"https://doi.org/10.1109/RAST.2017.8003002","url":null,"abstract":"The heliocentric motion of the solar sail spacecraft (SSS) is described in classical Keplerian elements. The solar sail with an ideal reflection coefficient is considered. The spacecraft performs a non-coplanar motion with the sun gravity and the light pressure. Disturbances of other celestial bodies gravity are not considered. To confirm the results correctness, we simulated the motion of solar sail spacecraft. The spacecraft's initial orbit coincides with the average Earth orbit relative to the Sun. Authors developed a program complex to simulate the planar heliocentric movement and obtained results for motion simulation of flights to Venus. The results were compared with the simulation results obtained using the Pontryagin maximum principle.","PeriodicalId":434418,"journal":{"name":"2017 8th International Conference on Recent Advances in Space Technologies (RAST)","volume":"657 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123974974","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
A simultaneous dual channel communication concept over 4D arrays in satellite networks 卫星网络四维阵列上的同步双通道通信概念
2017 8th International Conference on Recent Advances in Space Technologies (RAST) Pub Date : 2017-06-01 DOI: 10.1109/RAST.2017.8002929
Yasin Yavuz, E. Aksoy, Mert Karahan
{"title":"A simultaneous dual channel communication concept over 4D arrays in satellite networks","authors":"Yasin Yavuz, E. Aksoy, Mert Karahan","doi":"10.1109/RAST.2017.8002929","DOIUrl":"https://doi.org/10.1109/RAST.2017.8002929","url":null,"abstract":"In this study, a dual channel transmission concept over a single array with different frequencies and angle of arrivals without time division is presented. A time modulation scheme is applied to an ordinary linear array and the difference between main and fundamental radiation which can be steered independently with different frequencies is exploited in order to achieve a dual channel. By this way, both the so-called wasted power may be used in communication, and an independently steerable dual beam array may be constructed which may be utilized especially in multi-terminal communication infrastructures such as satellite networks. Since it is one of the fundamental communication techniques that the advanced ones are constructed on, a dual channel FM receiver structure is presented as an illustrative example to show the proposed concept is utilizable.","PeriodicalId":434418,"journal":{"name":"2017 8th International Conference on Recent Advances in Space Technologies (RAST)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125581804","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
A frequency selective surface design to reduce the interference effect on satellite communication 一种频率选择表面设计，减少对卫星通信的干扰影响
2017 8th International Conference on Recent Advances in Space Technologies (RAST) Pub Date : 2017-06-01 DOI: 10.1109/RAST.2017.8003013
Mert Karahan, E. Aksoy, Yasin Yavuz
{"title":"A frequency selective surface design to reduce the interference effect on satellite communication","authors":"Mert Karahan, E. Aksoy, Yasin Yavuz","doi":"10.1109/RAST.2017.8003013","DOIUrl":"https://doi.org/10.1109/RAST.2017.8003013","url":null,"abstract":"In this study, a sawtooth-shape scalable frequency selective surface structure (FSS) for X-band applications is presented. The proposed FSS structure intended to be used in shielding of X-band satellite communication systems to reduce the interference effect is specifically tuned to be operated in 10–12 GHz band and it is aimed to have a stable response at oblique incidence. The scalable design allows tuning the operating band up to scale factor of 0.6 without changing its dimensions. The structure is analyzed for commonly used dielectrics and design parameters. The performance of the design is simulated using CST Microwave Studio in terms of resonance frequency stability at oblique incidence and bandwidth. From the results, the design of the FSS has stable performance as a band-stop filter at oblique angle variations between 0° to 75° in TE and TM modes.","PeriodicalId":434418,"journal":{"name":"2017 8th International Conference on Recent Advances in Space Technologies (RAST)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114165509","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: 5
Production of lunar soil simulant in Turkey 土耳其月壤模拟物的生产
2017 8th International Conference on Recent Advances in Space Technologies (RAST) Pub Date : 2017-06-01 DOI: 10.1109/RAST.2017.8002977
Y. C. Toklu, Ali Erdem Çerçevik, S. Y. Kandemir, M. Yaylı
{"title":"Production of lunar soil simulant in Turkey","authors":"Y. C. Toklu, Ali Erdem Çerçevik, S. Y. Kandemir, M. Yaylı","doi":"10.1109/RAST.2017.8002977","DOIUrl":"https://doi.org/10.1109/RAST.2017.8002977","url":null,"abstract":"It is obvious that lunar structures will be constructed on lunar surface, and that the materials to be used are only lunar soil. That is why lunar soils has to be investigated thoroughly as to its physical, chemical and mechanical properties. Unfortunately there is not enough lunar rock or soil brought to Earth for being able to run these analyses. For this purpose, several simulants have been produced in countries like US, Canada, Japan, and China etc. This paper is about an attempt carried out for production of lunar soil simulant in Turkey. For this purpose, undegenerated soil samples are collected from relatively young regions of Turkey, like Kula Sandal Divlit region; the properties of these soils including their chemical properties are compared to properties of lunar soils. As a result of these comparisons, a mix is produced to represent lunar soil. It is hoped that this study will be repeated with more samples from other parts of Turkey to find other simulants to represent lunar soils and rocks in research about lunar constructions.","PeriodicalId":434418,"journal":{"name":"2017 8th International Conference on Recent Advances in Space Technologies (RAST)","volume":"482 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131608159","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
Nontraditional UKF based nanosatellite attitude estimation with the process and measurement noise covariances adaptation 基于UKF的非传统纳米卫星姿态估计与过程和测量噪声协方差自适应
2017 8th International Conference on Recent Advances in Space Technologies (RAST) Pub Date : 2017-06-01 DOI: 10.1109/RAST.2017.8003009
C. Hajiyev, Demet Cilden Guler, H. Soken
{"title":"Nontraditional UKF based nanosatellite attitude estimation with the process and measurement noise covariances adaptation","authors":"C. Hajiyev, Demet Cilden Guler, H. Soken","doi":"10.1109/RAST.2017.8003009","DOIUrl":"https://doi.org/10.1109/RAST.2017.8003009","url":null,"abstract":"In this study, we add on to our previous researches for non-traditional filtering the investigation of measurement and process noise covariance adaptation and propose an Adaptive Unscented Kalman Filter (AUKF) for nanosatellite attitude estimation. Singular Value Decomposition (SVD) method runs using the magnetometer and sun sensor measurements as the first stage of the algorithm and estimates the attitude of the nanosatellite giving one estimate at a single-frame. Then these estimated attitude terms are given as input to the AUKF. In the result, the attitude and attitude rates of the satellite are estimated reliably in the whole orbital period.","PeriodicalId":434418,"journal":{"name":"2017 8th International Conference on Recent Advances in Space Technologies (RAST)","volume":"1154 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121276498","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
Geomagnetic models at low earth orbit and their use in attitude determination 近地轨道地磁模型及其在姿态确定中的应用
2017 8th International Conference on Recent Advances in Space Technologies (RAST) Pub Date : 2017-06-01 DOI: 10.1109/RAST.2017.8003011
Demet Cilden Guler, Z. Kaymaz, C. Hajiyev
{"title":"Geomagnetic models at low earth orbit and their use in attitude determination","authors":"Demet Cilden Guler, Z. Kaymaz, C. Hajiyev","doi":"10.1109/RAST.2017.8003011","DOIUrl":"https://doi.org/10.1109/RAST.2017.8003011","url":null,"abstract":"In this study, three geomagnetic field models, T89, CHAOS-6 and IGRF-12 models are compared at LEO orbit altitudes with the satellite observations. Comparisons between the models and with the observations are made using the total magnetic field and the components during the geomagnetically disturbed and quiet times. Main interest is to see how the angle between the modelled and observed magnetic field vectors changes. The differences are important since satellite's attitude determination system strongly depends on the angle. Effects of geomagnetic activity on the angle is investigated using geomagnetic activity index and the position of the satellite which are inputs to the models. Comparisons are made between the models using root mean square error analysis. Differences between the model magnetic fields and those of observed are seen to increase when the geomagnetic activity occurs. We discuss the implications of these differences on the satellite attitude determination system.","PeriodicalId":434418,"journal":{"name":"2017 8th International Conference on Recent Advances in Space Technologies (RAST)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114524752","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
Information preserving preprocessing for improved radar target classification accuracy 提高雷达目标分类精度的信息保留预处理
2017 8th International Conference on Recent Advances in Space Technologies (RAST) Pub Date : 2017-06-01 DOI: 10.1109/RAST.2017.8003014
H. Bozkurt, I. Erer
{"title":"Information preserving preprocessing for improved radar target classification accuracy","authors":"H. Bozkurt, I. Erer","doi":"10.1109/RAST.2017.8003014","DOIUrl":"https://doi.org/10.1109/RAST.2017.8003014","url":null,"abstract":"Edge preserving image decomposition is proposed as a preprocessing technique to increase the accuracy in automatic radar target classification. The radar images are decomposed trough edge preserving image decomposition methods with parameters optimized for a better classification rate. By appropriate choice of the parameters, it is possible to keep the necessary information in the residual images while transferring the redundant information to the detail planes. Thus the use of residual image with the meaningful amount of data without redundancies increases the classification performance. The proposed preprocessing scheme is validated for an experimental dataset and compared with other image decomposition methods.","PeriodicalId":434418,"journal":{"name":"2017 8th International Conference on Recent Advances in Space Technologies (RAST)","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124177384","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
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