Results 41 to 50 of about 591,139 (353)
Availability Analysis of GNSS Signal in High Orbit [PDF]
Hangkong bingqi, 2021 Global navigation satellite system (GNSS) has the characteristics of strong autonomy, high real-time, high positioning accuracy and low cost, and it has been widely used by ground, low earth orbit (LEO) and medium earth orbit (MEO) users. However, in the
Lu Kewen,Wang Xinlong,Shen Liangliang,Cai Yuanwen,Chen Ding
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Capturing Near Earth Objects [PDF]
Research in Astronomy and Astrophysics (Chinese Journal of
Astronomy and Astrophysics), Vol. 10, Num. 6, pp.587-598, 2010, 2011 Recently, Near Earth Objects (NEOs) have been attracting great attention, and thousands of NEOs have been found to date. This paper examines the NEOs' orbital dynamics using the framework of an accurate solar system model and a Sun-Earth-NEO three-body system when the NEOs are close to Earth to search for NEOs with low-energy orbits. It is possible for
arxiv +1 more source
Test and Performance Analysis Methods of Low Earth Orbit GPS Receiver [PDF]
Journal of Astronomy and Space Sciences, 2006 The use of GPS receiver at outer space becomes common in low earth orbit. Recently most of satellites use GPS receiver as navigation solution for finding satellite position.
Dae-Won Chung, Sang-Jeong Lee
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Angles-only relative orbit determination in low earth orbit
Advances in Space Research, 2018 Abstract The paper provides an overview of the angles-only relative orbit determination activities conducted to support the Autonomous Vision Approach Navigation and Target Identification (AVANTI) experiment. This in-orbit endeavor was carried out by the German Space Operations Center (DLR/GSOC) in autumn 2016 to demonstrate the capability to perform
Ardaens J. -S., Gaias G.
openaire +4 more sources
The Effect of Air Drag in Optimal Power-Limited Rendezvous Between Coplanar Low-Earth Orbits [PDF]
Journal of Astronomy and Space Sciences, 1998 The effect of air drag was researched when a low-earth orbit spacecraft using power-limited thruster rendezvoused another low-earth orbit spacecraft. The air density was assumed to decrease exponentially.
Gil-Young Maeng, Kyu-Hong Choi
doaj
LEO Enhanced Global Navigation Satellite System (LeGNSS): progress, opportunities, and challenges
Geo-spatial Information Science, 2021 With the completion of Chinese BeiDou Navigation Satellite System (BDS), the world has begun to enjoy the Positioning, Navigation, and Timing (PNT) services of four Global Navigation Satellite Systems (GNSS).
Haibo Ge +8 more
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Why do Earth satellites stay up? [PDF]
, 2013 Satellites in low Earth orbits must accurately conserve their orbital eccentricity, since a decrease in perigee of only 5-10% would cause them to crash. However, these satellites are subject to gravitational perturbations from the Earth's multipole moments, the Moon, and the Sun that are not spherically symmetric and hence do not conserve angular ...
arxiv +1 more source
Routing optimization based on topology control in satellite network
Tongxin xuebao, 2018 A new double-layer satellite network model for space networking was established and a routing algorithm based on topology control (TCRA) was proposed considering the advantages of low earth orbit and stationary earth orbit satellite networks.This model ...
Xiaogang QI, Jiulong MA, Lifang LIU
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A Sensitivity Study of POD Using Dual-Frequency GPS for CubeSats Data Limitation and Resources
Remote Sensing, 2020 Making use of dual-frequency (DF) global navigation satellite system (GNSS) observations and good dynamic models, the precise orbit determination (POD) for the satellites on low earth orbits has been intensively investigated in the last decades and has ...
Kan Wang +3 more
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Standalone GPS L1 C/A Receiver for Lunar Missions
Sensors, 2016 Global Navigation Satellite Systems (GNSSs) were originally introduced to provide positioning and timing services for terrestrial Earth users. However, space users increasingly rely on GNSS for spacecraft navigation and other science applications at ...
Vincenzo Capuano +7 more
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