Zobrazeno 1 - 10
of 114
pro vyhledávání: '"Hyung-Chul Lim"'
Autor:
Hyung-Chul Lim, Ki-Pyoung Sung, Mansoo Choi, Jong Uk Park, Chul-Sung Choi, Seong-Cheol Bang, Young-Jun Cho, Hong-Kyu Moon
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 38, Iss 3, Pp 165-173 (2021)
Apophis is a near-Earth object with a diameter of approximately 340 m, which will come closer to the Earth than a geostationary orbit in 2029, offering a unique opportunity for characterizing the object during the upcoming encounter. Therefore, Kore
Externí odkaz:
https://doaj.org/article/42eab0b56c90488bac284b20529b68a3
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 37, Iss 1, Pp 11-18 (2020)
Satellite optical communication has gained significant attention owing to its many quality features (e.g., a larger bandwidth, license free spectrum, higher data rate, and better security) compared to satellite microwave communication. Various expe
Externí odkaz:
https://doaj.org/article/e311c64835b74e038898efa9b2ea4afe
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 36, Iss 2, Pp 97-103 (2019)
An automated signal-acquisition method for the NASA’s space geodesy satellite laser ranging (SGSLR) system is described as a selection of two system parameters with specified probabilities. These parameters are the correlation parameter: the minimu
Externí odkaz:
https://doaj.org/article/e14aaba6bc954bc0a517fa8e2b3fb146
Autor:
Hyung-Chul Lim, Ki-Pyoung Sung, Sung-Yeol Yu, Mansoo Choi, Eunseo Park, Jong-Uk Park, Chul-Sung Choi, Simon Kim
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 35, Iss 4, Pp 253-261 (2018)
Korea Astronomy and Space Science Institute (KASI) has been developing the space optical and laser tracking (SOLT) system for space geodesy, space situational awareness, and Korean space missions. The SOLT system comprises satellite laser ranging (
Externí odkaz:
https://doaj.org/article/a955433cbf684f55af615a2ff329c0f3
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 35, Iss 4, Pp 227-233 (2018)
This study presents the generation and accuracy assessment of predicted orbital ephemeris based on satellite laser ranging (SLR) for geostationary Earth orbit (GEO) satellites. Two GEO satellites are considered: GEO-Korea Multi-Purpose Satellite (K
Externí odkaz:
https://doaj.org/article/b859ae92f6464be0ad7ee1a62b3f1385
Publikováno v:
Sensors, Vol 22, Iss 9, p 3293 (2022)
A laser altimeter using code modulation techniques receives a backscattered pulse wider than the transmitted rectangular pulse when scanning a rough or sloped target surface. This leads to degrading the ranging performance in terms of signal-to-noise
Externí odkaz:
https://doaj.org/article/1f4955c0b23c44bebb6c22ad12797fdb
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 34, Iss 4, Pp 271-280 (2017)
This study presents the application of satellite laser ranging (SLR) to orbit determination (OD) of high-Earth-orbit (HEO) satellites. Two HEO satellites are considered: the Quasi-Zenith Satellite-1 (QZS-1), a Japanese elliptical-inclinedgeosynchrono
Externí odkaz:
https://doaj.org/article/7998fafe96e844e2860c6d348b754204
Publikováno v:
Remote Sensing, Vol 13, Iss 18, p 3739 (2021)
Two-way Laser Time Transfer (TLTT) using the Ajisai satellite has been considered as a more accurate and stable time transfer technique than existing methods; TLTT requires the kHz laser pulses to decrease the systematic restrictions for TLTT realiza
Externí odkaz:
https://doaj.org/article/8ffbfcfe5fc848f5a6b179e2d84a5e0c
Publikováno v:
Remote Sensing, Vol 13, Iss 10, p 1931 (2021)
Optical satellite communication has received considerable attention as a promising alternative to radio frequency communication because of its potential advantages including higher data rates and license free spectrum. Many studies have conducted per
Externí odkaz:
https://doaj.org/article/1cd967cd918c41eba3035bffce5ad610
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 37, Iss 4, Pp 219-218 (2020)
A CubeSat platform has become a popular choice due to inexpensive commercial off-the-shelf (COTS) components and low launch cost. However, it requires more power-efficient and higher-data rate downlink capability for space applications related to r
Externí odkaz:
https://doaj.org/article/2e2cbd5bf6f14cac8d551adee9d4e052