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

Airborne pseudolites in a Global Positioning System degraded environment 全球定位系统退化环境下的机载伪卫星

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2012-10-10 DOI: 10.1109/rast.2011.5966840

H. Oktay, M. Stepaniak

{"title":"Airborne pseudolites in a Global Positioning System degraded environment","authors":"H. Oktay, M. Stepaniak","doi":"10.1109/rast.2011.5966840","DOIUrl":"https://doi.org/10.1109/rast.2011.5966840","url":null,"abstract":"The Global Positioning System (GPS) is a continuous, all-weather navigation service that supports precise navigation for authorized military users. As with all satellite navigation systems, GPS is requires the user to maintain direct line-of-sight access to four or more satellites, and therefore performance is degraded or denied when the sky view is obstructed. To minimize this problem, various types of augmentations have been developed and tested. Pseudo-satellites, also called pseudolites, are one such augmentation system in which GPS-like ranging signals from additional transmitters supplement the satellite signals. This paper examines the ability of airborne pseudolites to support precise positioning in an urban environment. The impact of restricted satellite availability due to obstructions is examined for various urban terrain zones. Then the ability of the pseudolite to improve both availability and accuracy is investigated. A comparison of the system performance when relying on GPS only and when using an airborne pseudolite is presented for various positioning scenarios. Simulation results show that required accuracy and availability can be obtained by using an appropriately equipped airborne pseudolite.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117035942","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

SAR image segmentation using Contourlet Transform combined with Haralick Features Contourlet变换与Haralick特征相结合的SAR图像分割

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-07-29 DOI: 10.1109/RAST.2011.5966861

Bedrettin Erbil Konuk, I. Erer

引用次数: 0

From surface to orbit 从地表到轨道

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966922

A. Oláh

引用次数: 1

Monitoring the integrity of machine assemblies by using surface response to excitation (SuRE) approach 使用表面响应激励(SuRE)方法监测机器组件的完整性

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966917

I. Tansel, Gurjiwan Singh, G. Singh, S. Korla, B. Grisso, L. Salvino, Balemir Uragun

{"title":"Monitoring the integrity of machine assemblies by using surface response to excitation (SuRE) approach","authors":"I. Tansel, Gurjiwan Singh, G. Singh, S. Korla, B. Grisso, L. Salvino, Balemir Uragun","doi":"10.1109/RAST.2011.5966917","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966917","url":null,"abstract":"Fully automated integrity inspections of assembled autonomous space vehicles components are essential for their reliable and cost effective operation. Many researchers have already used structural health monitoring (SHM) methods for detecting loose bolts, plate defects, and many other structural problems. This study had two objectives. First, the performance of the surface response to excitation (SuRE) approach was tested for the detection of the compressive forces of a clamp applied to a small plate. The test indicated that the suRE approach could be used for detection of loose bolts attached to an aluminum plate. Secondly, the same approach was tested when the clamp was attached to a plate which was welded to the plate carrying the actuator and the sensor. The study demonstrated that the swept sine waves transmit through the welded joints. The integrity of the components could be evaluated by using the sensor and actuator located at another plate, as long as the plates are welded properly. The Lamb wave approach was also tested in both test conditions. SuRE approach was easier to interpret compare to the envelopes of the Lamb wave approach for our relatively small plates.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"76 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":"123042296","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: 7

Toward software-based safety systems in space 以软件为基础的太空安全系统

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966890

M. Klicker, H. Putzer

引用次数: 2

Report of CanSat Leader Training Program CanSat领导培训项目报告

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966964

Shusaku Yamaura, H. Akiyama, R. Kawashima

{"title":"Report of CanSat Leader Training Program","authors":"Shusaku Yamaura, H. Akiyama, R. Kawashima","doi":"10.1109/RAST.2011.5966964","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966964","url":null,"abstract":"CanSat Leader Training Program (CLTP) has been held in Japan from 14th February to 14th March 2011. This program is designed for researchers and educators in space engineering to learn the basic concept of space education, and also to experience practical hands-on training, system engineering, project management and teamwork. Participants are 12 and from 10 countries this year: Turkey, Mexico, Guatemala, Peru, Sri Lanka, Australia, Nigeria, Algeria, Egypt and Vietnam. A microcontroller module called mbed was used for the main computer, as it has online development environment as well as quite a few libraries for users to get used to it rapidly. In the first week, starting with lecture of mbed, three teams built very simple CanSats. The CanSats were launched by model rocket (2m long and goes up to the altitude of 350m) in Kada, Wakayama. Advanced level “come-back” CanSats were built in the rest of the weeks. Unfortunately, those CanSats were not launched due to the earthquake in Japan on 11th March 2011. However, CLTP ended successfully as they all experienced the primary purposes of this program. Instruction material of space education focused on CanSat is now in progress, and it is going to be tailored and translated into the version of respective countries. The basic concept of space education, the background of CLTP, and the detailed contents of program are explained in this paper.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"18 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":"117132153","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: 4

Modeling of the phase noise influence in the general M-PSK system 一般M-PSK系统中相位噪声影响的建模

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966863

O. Baran, M. Kasal, P. Vagner, T. Urbanec

引用次数: 4

Precise orbit determination for GPS and GLONASS satellites on the basis of IGS data 基于IGS数据的GPS和GLONASS卫星精确定轨

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966976

O. Bogdanov, A. Cepe

引用次数: 5

Wireless sensor networks for space and Solar-system missions 用于空间和太阳系任务的无线传感器网络

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966912

A. Akbulut, Fatma Patlar, A. Zaim, G. Yilmaz

引用次数: 8

Combined engineering and mission simulator for a satellite SAR system 卫星SAR系统工程与任务模拟器的结合

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966855

H. Urhan, Ozgur Sutcuoglu

引用次数: 2