Zobrazeno 1 - 10
of 46
pro vyhledávání: '"Kyoung-Min Roh"'
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 36, Iss 1, Pp 11-20 (2019)
Being a torque free motion of the rotating Earth, Chandler wobble is the major component in the Earth’s polar motion with amplitude about 0.05-0.2 arcsec and period about 430-435 days. Free core nutation, also called nearly diurnal free wobble, exi
Externí odkaz:
https://doaj.org/article/e1643b8224f344ad820befa8da528e34
Autor:
Kyoung-Min Roh, Yoola Hwang
Publikováno v:
International Journal of Aerospace Engineering, Vol 2020 (2020)
The Korean Multipurpose Satellite-5 (KOMPSAT-5) launched on 22 August 2013 was equipped with a global positioning system (GPS) receiver for precision orbit determination (POD). Even though the GPS receiver of KOMPSAT-5 shares the same heritage as the
Externí odkaz:
https://doaj.org/article/30a423e689ba478dad40a69c9f64601b
Publikováno v:
Remote Sensing, Vol 12, Iss 20, p 3365 (2020)
The Korean government has a plan to build a new regional satellite navigation system called the Korean Positioning System (KPS). The initial KPS constellation is designed to consist of seven satellites, which include three geostationary Earth orbit (
Externí odkaz:
https://doaj.org/article/ce8fb058edcc447694e078cfe267571e
Autor:
Kyoung-Min Roh, Byung-Kyu Choi
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 31, Iss 1, Pp 41-50 (2014)
The Earth is not perfectly spherical and its rotational axis is not fixed in space, and these geophysical and kinematic irregularities work as dominant perturbations in satellite orbit propagation. The International Earth Rotation Service (IERS) pr
Externí odkaz:
https://doaj.org/article/625314be51234cd092a478a22f7f497b
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 30, Iss 3, Pp 207-212 (2013)
Ionosphere is one of the largest error sources when the navigational signals produced by Global Positioning System (GPS) satellites are transmitted. Therefore it is very important to estimate total electron contents (TEC) in ionosphere precisely fo
Externí odkaz:
https://doaj.org/article/da12b9f6f51842f29ae926513c7901aa
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 29, Iss 3, Pp 269-274 (2012)
Kinematic global positioning system precise point positioning (GPS PPP) technology is widely used to the several area such as monitoring of crustal movement and precise orbit determination (POD) using the dual-frequency GPS observations. In this stud
Externí odkaz:
https://doaj.org/article/1dd1d39377224ef8b8d0d28dd965a0a0
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 29, Iss 3, Pp 295-303 (2012)
In this study, we compared the precipitable water vapor (PWV) data derived from the radiosonde observation data at Sokcho Observatory and the PWV data at Sokcho Global Positioning System (GPS) Observatory provided by Korea Astronomy and Space Science
Externí odkaz:
https://doaj.org/article/2ebc60fae46a428888f7f80070830a4f
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 29, Iss 1, Pp 1-10 (2012)
In this study, global positioning system (GPS)-derived precipitable water vapor (PWV) and microwave radiometer (MWR)-measured integrated water vapor (IWV) were compared and their characteristics were analyzed. Comparing those two quantities for two
Externí odkaz:
https://doaj.org/article/ac26f9b6260b4dae820c810e46e2c8ee
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 28, Iss 3, Pp 193-201 (2011)
A strategy for geostationary orbit (or geostationary earth orbit [GEO]) surveillance based on optical angular observations is presented in this study. For the dynamic model, precise analytical orbit model developed by Lee et al. (1997) is used to i
Externí odkaz:
https://doaj.org/article/708ef007733d4035a5cdce0916f36d99
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 26, Iss 4, Pp 499-510 (2009)
In this paper, relative orbit of Low Earth Orbit satellites is determined using only GPS measurements and the effects of Equatorial Spread-F (ESF), that is one of biggest ionospheric irregularities, are investigated. First, relative orbit determiat
Externí odkaz:
https://doaj.org/article/2c93e72fa4e743f2a6f8eb46be3eac26