公开(公告)号：US20180155066A1

公开(公告)日：2018-06-07

申请号：US15495437

申请日：2017-04-24

Applicant: Electronics and Telecommunications Research Institute

Inventor： Yoola HWANG ,  Byoung-Sun LEE

IPC: B64G1/24

CPC classification number: B64G1/242

Abstract: Provided is a satellite orbit controlling method and apparatus. A satellite orbit adjusting method performed at a current satellite may include measuring a distance between the current satellite and another satellite using a radio frequency; calculating a relative location relationship between the current satellite and the other satellite based on the measured distance, and estimating an orbit element based on the location relationship; calculating speed increment information for controlling a maneuver based on the estimated orbit element; and adjusting a satellite orbit of the current satellite based on the speed increment information.

公开(公告)号：US20230216511A1

公开(公告)日：2023-07-06

申请号：US17977074

申请日：2022-10-31

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Dong Hwan SHIN ,  Dong Pil CHANG ,  Seong Mo MOON ,  Byoung-Sun LEE

IPC: H03L7/099

CPC classification number: H03L7/0991

Abstract: A master reference oscillator system is provided. The master reference oscillator system includes a plurality of reference oscillators and a hybrid matrix receiving signals from the plurality of reference oscillators and outputting a plurality of output signals having the same signal magnitude, wherein at least two output signals among the plurality of output signals may have a phase difference.