Korea Aerospace Research Institute

Seon Ho Lee

Hye Jin Lee

Dae Kwan Kim

Jae Min Shin

Shi Hwan Oh

Yong Bok Kim

Hyun Ho Seo

Ki Lyuk Yong

Hong Taek Choi

Jo Ryeong Yim

Jae Cheol Yoon

A drone takeoff and landing system according to an embodiment comprises: a drone including a through-hole; and a landing pad including an extension member which can pass through the through-hole, wherein, when the extension member of the landing pad passes through the through-hole of the drone, an eddy current may occur between the through-hole and the extension member to cause magnetic braking of the drone.

Drone takeoff and landing system

Disclosed is a method and apparatus for correcting a satellite image acquisition time. The method may include receiving, from a ground-based orbit propagator, an initially predicted imaging time, a correction command execution time, and a desired satellite position for imaging, and calculating a waiting time for imaging, a predicted satellite position, a correction time, and a corrected imaging time to correct a satellite image acquisition time.

Method and apparatus for correcting satellite imaging time

A drone having a deployment device, which is configured such that the same can fly both in a folded mode and in a deployed mode. A platformis arranged in the middle of the drone body, a deployment deviceis arranged on the radial outer side of the platform, a fixed support tableextends outwardly from the radial outer surface of the platform, a rotating support tableis coupled to an outer free end of the fixed support table, and the rotating support tableis rotatably coupled to/supported on the outer free end of the fixed support table. Multiple propellersare mounted on the radial outer ends of the rotating support table, respectively, a landing structureis coupled to the body, and a holderis mounted on the landing structure

Drone capable of varying propeller arrangement shape

The present invention discloses an unfolding propeller unit type unmanned aerial vehicle including a body unit, a plurality of propeller units in which propellers are installed, a locking unit configured to lock the propeller units so that a state in which the propeller units are overlapping on the body unit is maintained, and propeller unit unfolders, each configured to connect each of the propeller units to the body unit, and unfold the propeller unit from the body unit so the propeller units are positioned around the body unit when locking of the locking unit is released.

Unfolding propeller unit type unmanned aerial vehicle

A drone according to an embodiment may comprise: a support table; a main unit spaced from the support table and formed above the support table; a connecting portion for connecting the main unit and the support table; and a propulsion unit provided on the outer side of the support table so as to generate thrust. The main unit may have a through-hole formed therein, a parachute may be provided inside the through-hole, and, during a fall, the parachute may be discharged out of the through-hole by deformation of the connecting portion.

Safety device and crash preventing drone comprising same

Provided is a sphere magnetic levitation system having magnetic-aligning devices that magnetically align the position of a sphere levitated by electromagnets according to whether the sphere is levitated, and a method of operating the sphere magnetic levitation system. The sphere magnetic levitation system includes: a sphere; a plurality of electromagnets symmetrically positioned about the sphere and spaced apart from the sphere at equal distances; and a plurality of magnetic-aligning devices provided around the sphere, and coming into contact with the sphere or separated from the sphere by a predetermined distance according to the modes of the system. The system is operated in one mode from among: an idle mode, in which the magnetic-aligning devices are in direct contact with and support the sphere; and an operation mode, in which the magnetic-aligning devices are separated from the sphere and the sphere is levitated and rotated.

Sphere magnetic levitation system and method of operating sphere magnetic levitation system

The objective of the present invention is to provide a control moment gyroscope which can be provided in a limited space since the volume thereof can be reduced without change in performance by optimizing the shapes and mounting positions of each component. To this end, the control moment gyroscope of the present invention is a control moment gyroscope for generating torque in the orthogonal directions to both of two shafts which are perpendicularly disposed to each other by rotating the two shafts, and the control moment gyroscope comprises: a gimbal motor formed in a hollow cylinder shape and supplying momentum; spin motor provided inside the gimbal motor and supplying momentum in a perpendicular direction to the momentum of the gimbal motor; and a flywheel provided in the inside of the gimbal motor and supplied with the rotational force of the gimbal motor and the rotational force of the spin motor.

Control moment gyroscope

Provided are an attitude control system and method of a spacecraft of an artificial satellite that may enhance a maneuverability and a controllability by simultaneously applying a reaction wheel and a thruster among drive units used to maneuver an attitude of the spacecraft of the artificial satellite. The attitude control system may include: a thruster-based attitude controller which control firing time of thrusters mounted on the spacecraft; and a reaction wheel-based attitude controller controlling driving of a reaction wheel mounted on the spacecraft. The spacecraft may include a plurality of reaction wheels. When a defect occurs in the spacecraft due to a partial malfunction of the reaction wheels, an attitude maneuverability of the spacecraft may be corrected by simultaneously applying the thruster-based attitude controller and the reaction wheel-based attitude controller.

Method for improving maneuverability and controllability by simultaneously applying both reaction wheel-based attitude controller and thruster-based attitude controller

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Daejeon, South Korea

Seon Ho Lee