Zobrazeno 1 - 10
of 87
pro vyhledávání: '"Kwan-Dong Park"'
Autor:
Sung-Ho Na, Wenbin Shen, Jungho Cho, Kiweon Seo, Young-Hong Shin, Kwan-Dong Park, Kookyoun Youm, Sung-Moon Yoo
Publikováno v:
Geodesy and Geodynamics, Vol 10, Iss 1, Pp 37-41 (2019)
The global oceanic/atmospheric tides exert decelerating/accelerating secular torques on the Earth rotation. We developed new formulations to accurately calculate amounts of two kinds of secular tidal torques. After Melchior, we found that an addition
Externí odkaz:
https://doaj.org/article/e2b20957a03c4ae78b56864cfa0b0be1
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 4, Pp 291-298 (2011)
The atmospheric infrared sounder (AIRS) sensor loaded on the Aqua satellite observes the global vertical structure of atmosphere and enables verification of the water vapor distribution over the entire area of South Korea. In this study, we perform
Externí odkaz:
https://doaj.org/article/b01c0d6230da4cb8ba22eae76f86d8be
Autor:
Chang-Moon Lee, Kwan-Dong Park
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 28, Iss 1, Pp 71-77 (2011)
Ionospheric error modeling is necessary to create reliable global navigation satellite system (GNSS) signals using a GNSS simulator. In this paper we developed algorithms to generate Klobuchar coefficients αn, βn (n = 1, 2, 3, 4) for a GNSS simul
Externí odkaz:
https://doaj.org/article/56ef907650cc448ab73d53601f61ca8b
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 27, Iss 2, Pp 117-122 (2010)
An ionospheric error simulation is needed for creating precise Global Positioning System (GPS) signal using GPS simulator. In this paper we developed Klobuchar coefficients αn and βn (n = 1, 2, 3, 4) generation algorithms for simulator and verifi
Externí odkaz:
https://doaj.org/article/6cf50896825d4ed7b18f200df684768c
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 27, Iss 1, Pp 21-30 (2010)
In processing space geodetic data, mapping functions are used to convert the tropospheric signal delay along the zenith direction to the line of sight direction. In this study, we compared three mapping functions by evaluating their effects on the
Externí odkaz:
https://doaj.org/article/b43518212bcd4f41b1f097b69cbfb240
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 26, Iss 4, Pp 547-554 (2009)
The Atmospheric Infrared Sounder (AIRS) aboard the Aqua satellite, which is one of the Earth Observing System satellites managed by National Aeronautics and Space Administration, provides global measurements of the water vapor in the atmosphere us
Externí odkaz:
https://doaj.org/article/b9b8e84d01f14a5b9c62c2557c6d6c0d
Autor:
Jihye Won, Kwan-Dong Park
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 26, Iss 4, Pp 511-520 (2009)
In this study, the Ocean Tide Loading (OTL) constituents were detected by the Precise Point Positioning (PPP) technique using GPS. Then, the GPS estimates of OTL constituents were compared with the predictions of the ocean tide models. We picked t
Externí odkaz:
https://doaj.org/article/7bd74d5855e24e13a458ce92df3ba71a
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 26, Iss 2, Pp 211-220 (2009)
As one of the GNSS error simulation case studies, we computed tropospheric signal delays based on three well-known models (Hopfield, Modified Hopfield and Saastamoinen) and a simple model. In the computation, default meteorological values were used.
Externí odkaz:
https://doaj.org/article/3b49f08510dc41cca2d006546f3e48f5
Autor:
Hye-In Kim, Kwan-Dong Park
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 26, Iss 2, Pp 199-210 (2009)
Even though there are several Global Navigation Satellite Systems under development, only GPS and GLONASS are currently available for satellite positioning. In this study, GLONASS orbits were predicted from broadcast ephemeris using the 4th-order Run
Externí odkaz:
https://doaj.org/article/ed582591c4394741bfe8ee10404ba83f