نتایج جستجو برای: artificial satellite

تعداد نتایج: 365560  

Journal: :محیط زیست طبیعی 0
بهناز راحلی دانش آموخته کارشناسی ارشد، گروه محیط زیست، دانشگاه تربیت مدرس نور، ایران عبدالرسول سلمان ماهینی دانشیار، گروه محیط زیست، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، ایران حمیدرضا مرادی استادیار، گروه آبخیزداری، دانشگاه تربیت مدرس نور، ایران

the aim of this study is to investigate underground water quality parameters in gorganrud river basin and their connection with aboveground conditions using gis and artificial neural networks. in order to prepare a land use map of the area, liss iii image of irs satellite of the year 2008 was used in a maximum likelihood classification. the results revealed that there was a significant correlat...

Journal: :journal of electrical and computer engineering innovations 2013
m. h. refan a. dameshghi

if both reference station (rs) and navigational device in differential global positioning system (dgps) receive signals from the same satellite, rs position components error (rpce) can be used to compensate for navigational device error. this research used hybrid method for rpce prediction which was collected by a low-cost gps receiver. it is a combination of genetic algorithm (ga) computing an...

Journal: :Science China Information Sciences 2023

Satellite communication has the characteristics of wide coverage and large capacity, is not easily affected by land disasters. It quite suitable as a supplement to terrestrial networks been widely used in education, navigation, emergency relief, military, etc. However, due openness channel satellite systems, signals are eavesdropped on eavesdroppers. This greatly threatens privacy security coun...

2009

In this paper we propose and analyse a multispacecraft approach to the problem of deflection of a NEO object. The Electrostatic Tractor is a concept where deflection occurs because of a satellite and the asteroid electrically charged interaction. Although the physical laws which describe this phenomenon are well established, a number of practical questions are still being investigated. There ar...

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