Results 1 to 10 of about 43,155 (284)

Initial Results of Modeling and Improvement of BDS-2/GPS Broadcast Ephemeris Satellite Orbit Based on BP and PSO-BP Neural Networks

open access: yesRemote Sensing, 2021
With the rapid development and gradual perfection of GNSS in recent years, improving the real-time service performance of GNSS has become a research hotspot. In GNSS single-point positioning, broadcast ephemeris is used to provide a space–time reference.
Hanlin Chen   +5 more
doaj   +2 more sources

ALMA SOLAR EPHEMERIS GENERATOR [PDF]

open access: yesRudarsko-geološko-naftni Zbornik, 2019
An online software tool for the easy preparation of ephemerides of the solar surface features is presented. It was developed as a helper tool for the preparation of observations of the Sun with the Atacama Large Millimeter/submillimeter Array (ALMA), but
Ivica Skokić, Roman Brajša
doaj   +5 more sources

Ten Years of VIIRS On-Orbit Geolocation Calibration and Performance

open access: yesRemote Sensing, 2022
The first innovative Visible Infrared Imaging Radiometer Suite (VIIRS) sensor aboard the Suomi National Polar-orbiting Partnership (SNPP) satellite has been in operation for 10 years since its launch on 28 October 2011. The second VIIRS sensor aboard the
Guoqing Lin   +4 more
doaj   +1 more source

Development of Kinematic Ephemeris Generator for Korea Pathfinder Lunar Orbiter (KPLO)

open access: yesJournal of Astronomy and Space Sciences, 2020
This paper presents a kinematic ephemeris generator for Korea Pathfinder Lunar Orbiter (KPLO) and its performance test results. The kinematic ephemeris generator consists of a ground ephemeris compressor and an onboard ephemeris calculator.
Min-Sup Song   +3 more
doaj   +1 more source

Daylight Observations of Venus with Naked Eye in the Goryeosa [PDF]

open access: yesJournal of Astronomy and Space Sciences, 2017
In this paper, we investigate the observations of Venus in daytime that are recorded in the Goryeosa (History of the Goryeo Dynasty, A.D. 918-1392). There are a total of 167 accounts of such observations in this historical book, spanning a period of ...
Ki-Won Lee
doaj   +1 more source

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