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استخراج اتوماتیک ردّ ماهواره در تصاویر رقومی نجومی | ||
فیزیک زمین و فضا | ||
مقاله 2، دوره 43، شماره 3، مهر 1396، صفحه 473-487 اصل مقاله (1.39 M) | ||
شناسه دیجیتال (DOI): 10.22059/jesphys.2017.61671 | ||
نویسندگان | ||
سعید فرزانه* 1؛ محمدعلی شریفی2؛ منا کوثری3 | ||
1استادیار، دانشکده مهندسی نقشهبرداری و اطلاعات مکانی، پردیس دانشکدههای فنی دانشگاه تهران، ایران | ||
2دانشیار، دانشکده مهندسی نقشهبرداری و اطلاعات مکانی، پردیس دانشکدههای فنی دانشگاه تهران، ایران | ||
3دانشجوی کارشناسی ارشد، دانشکده مهندسی نقشهبرداری و اطلاعات مکانی، پردیس دانشکدههای فنی دانشگاه تهران، ایران | ||
چکیده | ||
از جمله مهمترین ارکان استقلال در برنامههای فضایی هر کشور، داشتن توانایی ردیابی و تعیین مدار ماهوارهها است. یکی از روشهای آگاهی از موقعیت دقیق ماهوارهها در یک چارچوب مرجع مشخص در ژئودزی ماهوارهای روش کینماتیک است. در این روش، مدار ماهواره بهطور مستقیم از روی مشاهدات ایستگاههای ردیابی تعیین میشود. در این راستا روش ردیابی ماهواره با استفاده از سیستمهای اپتیکی در صورت برقراری شرایط ایدهآل، دقتی بیشتر از سایر روشهای مشاهداتی مبتنی بر فاصله را دارد. در این روش میتوان با استفاده از یک CCD و تلسکوپ مناسب، اطلاعات مربوط به ستارهها و ردّ پای ماهواره را ثبت کرد. در این تحقیق روشی اتوماتیک جهت استخراج مدل اثر ردّ ماهواره ارائه شده است. در این فرایند ابتدا با استفاده از معادلۀ نفوذ، نویز تصویری حذف و سپس ستارههای موجود در عکس شناسایی و حذف شده، در مرحلۀ بعد با استفاده از الگوریتم خوشهبندی DBSCAN پیکسلهای مربوط به ردّ ماهواره تشخیص داده شد؛ نهایتاً با استفاده از الگوریتم MSAC مدل مناسب برای ردّ پای ماهواره برآورد شد. | ||
کلیدواژهها | ||
استخراج ردّ پای ماهواره؛ الگوریتم MSAC؛ الگوریتم خوشهبندی DBSCAN؛ ردیابی ماهواره | ||
عنوان مقاله [English] | ||
Automatic satellite streaks detection in astronomical images | ||
نویسندگان [English] | ||
saeed farzaneh1؛ Mohammad Ali Sharifi2؛ Mona Kosary3 | ||
1Assistant Professor, Department of Surveying and Geomatics Engineering, Faculty of Engineering, University of Tehran, Iran | ||
2Associate Professor, Department of Surveying and Geomatics Engineering, Faculty of Engineering, University of Tehran, Iran | ||
3M.Sc. Student, Department of Surveying and Geomatics Engineering, Faculty of Engineering, University of Tehran, Iran | ||
چکیده [English] | ||
In the current state of colonization of near Earth space by satellites, there is an increasing need to know exactly the real status of occupation of this space. Thus, orbital parameters for all objects travelling in this space must be known with a high degree of accuracy, and this knowledge must be periodically updated, because this situation is always changing. Atmospheric drag, solar wind, moon and planetary gravitational perturbations, Earth oblateness, etc. are all sources of interference that generate orbital perturbations beyond what the best orbital model can predict. The solution is to periodically observe all the satellites, particularly the debris (because active satellites themselves contribute to maintain the knowledge of their orbital parameters), determine with precision their positions and update their known orbital parameters. There is a real need for sky surveillance in order to monitor either the satellites or the non-functional space objects for different purposes, such as to correct the satellites deviations from their trajectories, to detect uncataloged space debris objects and to avoid possible collisions. In order to define the location of the satellite in the sky and then to update its orbital parameters, an optical satellite tracking system can be designed which acquires sequences astronomical images from the sky. Such system is composed of many sensors like a telescope, a CCD camera, a GPS receiver, etc. Also, some reference data such as the star catalogues and the Two Lines Element (TLE) database are used. The telescope is used to search the sky and point to the satellite, precisely. The CCD camera acquires some sequences images in a current time provided by GPS. The star catalogues are employed to calibrate the image plane to the celestial coordinate systems. The TLE database contains the out-dated orbital parameters to estimate the satellite position. For this purpose an algorithms and software that can automatically detect and report the presence of satellite streaks in the acquired images are needed. The algorithms presented in this document were developed for this purpose. The image processing technique presented in this document is a collection of algorithms used to detect and classify everything that can be observed in the image, such as stars, satellite streaks and image artefacts. First due to the use of digital imagery, the quality of digital images is critical and affects the final product. Different noises in imaging phase could degrade the quality of image, for this purpose the non-linear diffusion filter has been used. This technique, is based on the use of partial differential equations, the idea behind the use of the diffusion equation in image processing arose from the use of the Gaussian filter in multi-scale image analysis. Second for the removal of the image background the stars have been detected using SIFT method. In this method the star's centers are extracted with sub-pixel precision, then they have been subtracted from image in an iteration producer. Third the clustering method has been applied for satellite streak detection. In this way the Density-based spatial clustering of applications with noise (DBSCAN) which is a density-based clustering algorithm has been used, finally MSAC algorithm has been implemented for streak model extraction. | ||
کلیدواژهها [English] | ||
satellite tracking, satellite streak detection, MSAC algorithm, DBSCAN clustering algorithm | ||
مراجع | ||
روغنی زاده، ا.، 2009، تعیین مدار ماهواره LEO با استفاده از امواج ارسالی از ماهواره. کارشناسی ارشد، دانشگاه صنعتی شریف. شریفی، م. ع.، فرزانه س. و سیف، م. 2015، تشخیص اتوماتیک ستارگان در یک سامانه نجومی بینایی مبنا برای ردیابی ماهوارهها.
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