Pub Date : 2009-06-11DOI: 10.1109/RAST.2009.5158205
S. Aytulun, M. Ermis
Evaluating the reliability of a network based project often involves an intensive simulation exercise to randomly generate and evaluate different possible network states. This paper proposes an algorithm to approximate the network reliability which minimizes the use of such simulation procedure. For this purpose, a space lunch vehicle project with network properties is analyzed using project scheduling techniques. Thus, the project processes are described as networks, modeled and timed by network properties and stochastically analysed using GERT, a project based process scheduling method. A set of computation experiments are conducted to employ the effectiveness and robustness of our GERT-based solution. The experimental study also indicates that our model can be effectively deployed in many practical scenarios.
{"title":"Space launch vehicle project reliability analysis by using GERT","authors":"S. Aytulun, M. Ermis","doi":"10.1109/RAST.2009.5158205","DOIUrl":"https://doi.org/10.1109/RAST.2009.5158205","url":null,"abstract":"Evaluating the reliability of a network based project often involves an intensive simulation exercise to randomly generate and evaluate different possible network states. This paper proposes an algorithm to approximate the network reliability which minimizes the use of such simulation procedure. For this purpose, a space lunch vehicle project with network properties is analyzed using project scheduling techniques. Thus, the project processes are described as networks, modeled and timed by network properties and stochastically analysed using GERT, a project based process scheduling method. A set of computation experiments are conducted to employ the effectiveness and robustness of our GERT-based solution. The experimental study also indicates that our model can be effectively deployed in many practical scenarios.","PeriodicalId":412236,"journal":{"name":"2009 4th International Conference on Recent Advances in Space Technologies","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133758826","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}
Pub Date : 2009-06-11DOI: 10.1109/RAST.2009.5158288
Beatrice G. R. Smith, G. P. Scott, C. Saaj
This paper details some of the various robotics projects which have been inspired by the natural world, and which the authors believe will have an impact on the future of robotic space exploration. This includes both hardware-centric projects such as RiSE, and projects which concentrate more on software and control such as Swarm-bots. The authors outline two of the biologically inspired planetary explorer robots currently under investigation at the University of Surrey.
{"title":"Biorobotics: Innovative and low cost technologies for next generation planetary rovers","authors":"Beatrice G. R. Smith, G. P. Scott, C. Saaj","doi":"10.1109/RAST.2009.5158288","DOIUrl":"https://doi.org/10.1109/RAST.2009.5158288","url":null,"abstract":"This paper details some of the various robotics projects which have been inspired by the natural world, and which the authors believe will have an impact on the future of robotic space exploration. This includes both hardware-centric projects such as RiSE, and projects which concentrate more on software and control such as Swarm-bots. The authors outline two of the biologically inspired planetary explorer robots currently under investigation at the University of Surrey.","PeriodicalId":412236,"journal":{"name":"2009 4th International Conference on Recent Advances in Space Technologies","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114156766","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}
Pub Date : 2009-06-11DOI: 10.1109/RAST.2009.5158253
O. Baran, M. Kasal
Our work is devoted to frequency domain and time domain simulations of the oscillator phase noise, we deals with the time and the frequency stability of oscillators. Increasing communication rates, long communication distances, increasing computing speeds of modern computers, eventually, put claims on the accuracy and especially on the stability of carrier frequencies or timing. In real systems, the noise is always presented and it is not possible to be totally suppressed. But studying of the noise behavior, one can find the way of minimizing the noise influence and thus, the way of developing systems with better parameters. According to given phase noise parameters in the frequency domain, we simulate the oscillator output signal distorted with this noise in the time domain. With help of time dependent time fluctuations, oscillator output signal is processed statistically with Allan variances. Simulated results are in a good coincidence with the direct calculation implying from the domains conversion formula. The signal affected by the phase noise is going to be utilized for the evaluation of the phase noise influence in satellite communication chains.
{"title":"Study of oscillators frequency stability in satellite communication links","authors":"O. Baran, M. Kasal","doi":"10.1109/RAST.2009.5158253","DOIUrl":"https://doi.org/10.1109/RAST.2009.5158253","url":null,"abstract":"Our work is devoted to frequency domain and time domain simulations of the oscillator phase noise, we deals with the time and the frequency stability of oscillators. Increasing communication rates, long communication distances, increasing computing speeds of modern computers, eventually, put claims on the accuracy and especially on the stability of carrier frequencies or timing. In real systems, the noise is always presented and it is not possible to be totally suppressed. But studying of the noise behavior, one can find the way of minimizing the noise influence and thus, the way of developing systems with better parameters. According to given phase noise parameters in the frequency domain, we simulate the oscillator output signal distorted with this noise in the time domain. With help of time dependent time fluctuations, oscillator output signal is processed statistically with Allan variances. Simulated results are in a good coincidence with the direct calculation implying from the domains conversion formula. The signal affected by the phase noise is going to be utilized for the evaluation of the phase noise influence in satellite communication chains.","PeriodicalId":412236,"journal":{"name":"2009 4th International Conference on Recent Advances in Space Technologies","volume":"185 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114427401","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}
Pub Date : 2009-06-11DOI: 10.1109/RAST.2009.5158265
S. Anilir
This paper studies an Infra-Free (IF) scenario in a Japanese shrinking sub-urban city (Kushimoto) by proposing a vertical food tower build on an inhabited island (Tsuyajima) that could use solid and liquid waste from a community (Ki-oshima) and provide food in return. Despite the fact that Japan has 426 inhabited islands, increasing waste production and the fact of 60% import of its food consumption; the focus on Tsuyajima island investigates how an community-integrated waste-to-food cycle could contribute to the physical, social and economical infrastructure and become a unique architectural landmark to directly/indirectly influence urban life quality and tourism.
{"title":"Management of a small-community waste-food cycle on an inhabited island in Kushimoto town to address Japanese sub-urban shrinking city problem","authors":"S. Anilir","doi":"10.1109/RAST.2009.5158265","DOIUrl":"https://doi.org/10.1109/RAST.2009.5158265","url":null,"abstract":"This paper studies an Infra-Free (IF) scenario in a Japanese shrinking sub-urban city (Kushimoto) by proposing a vertical food tower build on an inhabited island (Tsuyajima) that could use solid and liquid waste from a community (Ki-oshima) and provide food in return. Despite the fact that Japan has 426 inhabited islands, increasing waste production and the fact of 60% import of its food consumption; the focus on Tsuyajima island investigates how an community-integrated waste-to-food cycle could contribute to the physical, social and economical infrastructure and become a unique architectural landmark to directly/indirectly influence urban life quality and tourism.","PeriodicalId":412236,"journal":{"name":"2009 4th International Conference on Recent Advances in Space Technologies","volume":"37 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132130989","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}
Pub Date : 2009-06-11DOI: 10.1109/RAST.2009.5158271
E. Erdogan, M. O. Karslioglu
Reduced dynamic models combined with GPS-Observations on board the satellites within an extended Kalman Filtering algorithm increases the accuracy of near real time orbit determination.
采用扩展的卡尔曼滤波算法，将简化的动态模型与卫星上的gps观测相结合，提高了近实时定轨精度。
{"title":"Near real time orbit detemination of BILSAT-1","authors":"E. Erdogan, M. O. Karslioglu","doi":"10.1109/RAST.2009.5158271","DOIUrl":"https://doi.org/10.1109/RAST.2009.5158271","url":null,"abstract":"Reduced dynamic models combined with GPS-Observations on board the satellites within an extended Kalman Filtering algorithm increases the accuracy of near real time orbit determination.","PeriodicalId":412236,"journal":{"name":"2009 4th International Conference on Recent Advances in Space Technologies","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132257697","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}
Pub Date : 2009-06-11DOI: 10.1109/RAST.2009.5158225
M. Smirnov, N. Armand, S. Marechek, Y. Tishchenko, V. S. Ablyazov, A. Khaldin
Two L-band Radiometric Systems for Earth remote sensing from space which are under development in Russia are described. The main goals of the planned experiments are improvement of radiophysical methods for Earth remote sensing, investigation of soil moisture variations in global and regional scales and sea surface salinity estimations. Especial interest has analogous instruments for ground truth measurements. Some results of experiments with ground based L-band radiometer are presented.
{"title":"L-band Radiometric Systems for Earth remote sensing from space and ground truth measurements","authors":"M. Smirnov, N. Armand, S. Marechek, Y. Tishchenko, V. S. Ablyazov, A. Khaldin","doi":"10.1109/RAST.2009.5158225","DOIUrl":"https://doi.org/10.1109/RAST.2009.5158225","url":null,"abstract":"Two L-band Radiometric Systems for Earth remote sensing from space which are under development in Russia are described. The main goals of the planned experiments are improvement of radiophysical methods for Earth remote sensing, investigation of soil moisture variations in global and regional scales and sea surface salinity estimations. Especial interest has analogous instruments for ground truth measurements. Some results of experiments with ground based L-band radiometer are presented.","PeriodicalId":412236,"journal":{"name":"2009 4th International Conference on Recent Advances in Space Technologies","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134593638","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}
Pub Date : 2009-06-11DOI: 10.1109/RAST.2009.5158226
B. Demir, S. Erturk
This paper proposes to improve classification accuracy of hyperspectral images by using sample interpolation when limited training samples are available. The training data size is artificially increased by adding training samples that have been interpolated from the original training data. Two approaches are presented with different number of training patterns being considered in the interpolation process. In the first approach, the number of samples is approximately doubled, by adding the average of each training sample with another randomly selected training sample of the same class, to the training set. In the second approach, the averages of each sample with each of all other samples of the same class are added to the training set. This approach is referred to as the limit case. For classification, initially, Support Vector Machine (SVM) training is applied to the new and larger sized training data. These support vectors are then used in the classification step. Experimental results show that the proposed algorithm provides increased classification accuracy if a limited number of training samples are available using a simple and effective training data interpolation approach.
{"title":"Increasing hyperspectral image classification accuracy for data sets with limited training samples by sample interpolation","authors":"B. Demir, S. Erturk","doi":"10.1109/RAST.2009.5158226","DOIUrl":"https://doi.org/10.1109/RAST.2009.5158226","url":null,"abstract":"This paper proposes to improve classification accuracy of hyperspectral images by using sample interpolation when limited training samples are available. The training data size is artificially increased by adding training samples that have been interpolated from the original training data. Two approaches are presented with different number of training patterns being considered in the interpolation process. In the first approach, the number of samples is approximately doubled, by adding the average of each training sample with another randomly selected training sample of the same class, to the training set. In the second approach, the averages of each sample with each of all other samples of the same class are added to the training set. This approach is referred to as the limit case. For classification, initially, Support Vector Machine (SVM) training is applied to the new and larger sized training data. These support vectors are then used in the classification step. Experimental results show that the proposed algorithm provides increased classification accuracy if a limited number of training samples are available using a simple and effective training data interpolation approach.","PeriodicalId":412236,"journal":{"name":"2009 4th International Conference on Recent Advances in Space Technologies","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133746870","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}
Pub Date : 2009-06-11DOI: 10.1109/RAST.2009.5158256
C. Yarim, U. Daybelge, A. Sofyali
Effects of general relativity on the motion of a spacecraft moving on a particular trajectory around Earth is investigated numerically in the context of circular restricted three body problem. It is seen that the general relativistic effects are worth to be included in the calculations, since they are observable to the Earth based observation devices terrestrial or spaceborne after a reasonable period. Even the effects of frame-dragging of rotating Earth can be detected by the current devices.)
{"title":"Search for the general relativistic effects on the motion of a spacecraft","authors":"C. Yarim, U. Daybelge, A. Sofyali","doi":"10.1109/RAST.2009.5158256","DOIUrl":"https://doi.org/10.1109/RAST.2009.5158256","url":null,"abstract":"Effects of general relativity on the motion of a spacecraft moving on a particular trajectory around Earth is investigated numerically in the context of circular restricted three body problem. It is seen that the general relativistic effects are worth to be included in the calculations, since they are observable to the Earth based observation devices terrestrial or spaceborne after a reasonable period. Even the effects of frame-dragging of rotating Earth can be detected by the current devices.)","PeriodicalId":412236,"journal":{"name":"2009 4th International Conference on Recent Advances in Space Technologies","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122005161","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}
Pub Date : 2009-06-11DOI: 10.1109/RAST.2009.5158209
S. Kurnaz, R. Rustamov, Saida A. Salahova, M. Zeynalova
Flood and as an impact of inundation is the natural event. It mainly occurs when the river catchment, (that is the area of land that feeds water into the river and the streams that flow into the main river) receives greater than usual amounts of water (for example through rainfall or melting snow). The river can not cope and this extra water causes the level of the water in the river to rise and a flood to take place. This flooding may take place at any point along the river course and not necessarily at the place where the extra water has entered.
{"title":"River inundation impact reduction based on space technology application","authors":"S. Kurnaz, R. Rustamov, Saida A. Salahova, M. Zeynalova","doi":"10.1109/RAST.2009.5158209","DOIUrl":"https://doi.org/10.1109/RAST.2009.5158209","url":null,"abstract":"Flood and as an impact of inundation is the natural event. It mainly occurs when the river catchment, (that is the area of land that feeds water into the river and the streams that flow into the main river) receives greater than usual amounts of water (for example through rainfall or melting snow). The river can not cope and this extra water causes the level of the water in the river to rise and a flood to take place. This flooding may take place at any point along the river course and not necessarily at the place where the extra water has entered.","PeriodicalId":412236,"journal":{"name":"2009 4th International Conference on Recent Advances in Space Technologies","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130077345","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}
Pub Date : 2009-06-11DOI: 10.1109/RAST.2009.5158247
A. B. Uygur, H. Isik, Erhan Solakoğlu, A. G. Yazicioglu
This paper discusses the development of an in-house computer code for the thermal analysis of satellites. The code uses Thermal Network Method (TNM) in conjunction with the Method of Lines (MOL) for the solution of the energy equation in the presence of radiative heat transfer. The predictive accuracy of the code is demonstrated on a test problem involving a cubic satellite with two solar panels and a single representative payload at its center to account for all other possible equipments in the satellite. The results produced by the present code were compared with the predictions of commercial thermal analysis software on the same test problem and a good agreement between the two sets of results was obtained. The code is a promising tool for the thermal analysis of satellites.
{"title":"Development of an in-house computer code for the thermal analysis of satellites using Thermal Network Method and Method of Lines","authors":"A. B. Uygur, H. Isik, Erhan Solakoğlu, A. G. Yazicioglu","doi":"10.1109/RAST.2009.5158247","DOIUrl":"https://doi.org/10.1109/RAST.2009.5158247","url":null,"abstract":"This paper discusses the development of an in-house computer code for the thermal analysis of satellites. The code uses Thermal Network Method (TNM) in conjunction with the Method of Lines (MOL) for the solution of the energy equation in the presence of radiative heat transfer. The predictive accuracy of the code is demonstrated on a test problem involving a cubic satellite with two solar panels and a single representative payload at its center to account for all other possible equipments in the satellite. The results produced by the present code were compared with the predictions of commercial thermal analysis software on the same test problem and a good agreement between the two sets of results was obtained. The code is a promising tool for the thermal analysis of satellites.","PeriodicalId":412236,"journal":{"name":"2009 4th International Conference on Recent Advances in Space Technologies","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129890675","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}
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