• The Journal of the Korea institute of electronic communication sciences
• /
• v.13 no.1
• /
• pp.127-132
• /
• 2018

One of the key issues in the Unmanned Aerial Vehicle (: UAV) technology is the collision avoidance. Specifically, the collision avoidance among multiple UAVs is critical to expand UAV applications to civil sector where large number of UAVs could be operated in the limited space. In this paper, we introduce a collision avoidance scheme based on Flying Ad Hoc Network (: FANET). The proposed scheme adopts collision avoidance mechanism used in wireless data communication networks. Using this scheme UAVs can not only communicate conventional user information, but also share flight information to avoid collision.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2015.05a
• /
• pp.101-104
• /
• 2015

In this paper, a flight techniques many quadcopters which can be configured flexibly squadron according to the situation in wireless sensor networks is suggested. In previous studies, aircrafts fly only as part of a prescribed form and know the distance between the aircraft by sensor was able to maintain the fleet. Also, the problem occurs that between the aircraft distance is not constant. In this paper, proposes an algorithm that the context of the formation fly using the current position of the quadcopter through a virtual map is based on the relative coordinates without being affected by Indoor, outdoor and obstacles. Proposed algorithm is Leader-Follower Technique that the method of determinin the shape of the squadron to the down command to the sub-quadcopter using the wireless network by the main quadcopter to determine a given situation. As simulation result, the proposed algorithm was confirmed that formation flight efficient in sensing the all conditions as compared to the conventional method.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2022.07a
• /
• pp.313-314
• /
• 2022

본 논문에서는 Restful API를 이용하여 실시간으로 드론 비행 허가 시스템으로부터 결과 도출 받는 서버를 구현한 결과를 보인다. Flask API과 Ubuntu(AWS)를 이용하여 메인 서버인 허가 시스템과 드론 역할을 하는 실시간으로 요청 신호를 보내는 테스트 서버를 구축하였다. 메인 서버는 Polygon 라이브러리를 이용하여 입력받은 좌표를 사전 조건에 따라 분석하여 승인 여부를 결정하고, API를 이용하여 결과를 테스트 서버에 반환할 수 있도록 구현하였다. 드론 교통 관리를 위한 다양한 드론 비행 허가 방안을 테스트하도록 활용할 계획이다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2012.06a
• /
• pp.194-196
• /
• 2012

본 논문은 비행체를 위한 실시간 운영체제의 태스크 스케줄링 기법을 제안한다. 기존의 기법은 다음 수행할 태스크를 선택하는 작업을 수행할 때 메모리 오버헤드 또는 일정한 시간 오버헤드가 발생하게 되며 일반적으로 이 둘은 트레이드 오프 관계로 고려된다. 제안하는 태스크 스케줄링 기법은 메모리 오버헤드를 최소화하면서도 우선 순위가 제일 높은 태스크를 찾는 작업을 별다른 연산 없이 수행함으로써 자주 발생하는 작업의 시간을 줄여 스케줄러 시간 오버헤드의 절약을 도모한다. 또한 이 방식은 태스크의 수가 많지 않으며 일정한 파티션된 OS를 주로 사용하는 비행체에 특히 적합하다.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.38 no.3
• /
• pp.264-273
• /
• 2010

In this work, autonomous formation flight tests of multiple UAVs are experimentally studied. After a guidance and control system for a UAV is designed and tested, PID formation controller for follower UAV is tested using longitudinal and lateral distance feedback. It is shown that more stable and efficient formation guidance system is obtained by using position and attitude of the leader aircraft, which is exploited to calculate virtual waypoint for follower. In order to improve transient response during turn, part of roll command of the leader is added to the guidance command. Finally, autonomous formation flight test results of 3 UAVs are shown by using the best guidance algorithm suggested.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2009.05a
• /
• pp.785-788
• /
• 2009

The flight data processing system is the system which processes and manages all flight related data for the aircraft control and performs the trajectory modeling. It takes charge of the role of performing the core function of the integrated information processing system for the flight control. For the safe aircraft's flight, the information transfer and exchange among air traffic control units are the essential element through the flight data processing. Therefore, for the development of the flight data processing system we are going to analyze its function and look into the necessary consideration in a design in this paper.

• Journal of Convergence for Information Technology
• /
• v.10 no.10
• /
• pp.123-127
• /
• 2020

In order to obtain the overall fire line information of medium and large forest fires at night, the ground control system was developed to determine whether forest fires occurred through real-time video clips and to calculate the location of the forest fires determined using the location of drones, angle information of video cameras, and altitude information on the map to reduce the time required for regular video matches obtained after the completion of the mission. To verify the reliability of the developed function, the error distance of the aiming position information of the flight altitude star and the image camera was measured, and the location information within the reliable range was displayed on the map. As the function developed in this paper allows real-time identification of multiple locations of forest fires, it is expected that overall fire line information for the establishment of forest fire extinguishing measures will be obtained more quickly.

• Journal of Korea Society of Industrial Information Systems
• /
• v.20 no.5
• /
• pp.1-11
• /
• 2015

This paper is focused on how the trajectory of launch vehicle could be optimally estimated by the quadratic regression of trajectory data mining for the operation of telemetry ground system in NARO space center during real-time. To receive the telemetry data, the telemetry ground system has to track the space launch vehicle without tracking loss, and it is possible by the well-designed algorithm to estimate a flight position in real-time. For this reason, the quadratic regression model instead of interpolation was considered to estimate the exact position data of launch vehicle and the improvement of antenna performance. For analysis, the real trajectory data which had been logged during NARO 1st launch mission were used, the estimation result of launcher current position was analyzed by the mathematical modeling. In conclusion, the algorithm using quadratic regression based on trajectory data mining showed the better performance than previous interpolation algorithm to estimate the next flight position and the antenna driving performance.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2010.04a
• /
• pp.78-81
• /
• 2010

ARINC 653은 통합형 항공전자 시스템에서 사용되는 응용프로그램 간의 인터페이스와 실시간 운영체제의 표준을 정의한다. ARINC 653에 정의되어 있는 네트워크 통신 인터페이스는 대형 항공기뿐만 아니라 무인 비행체와 같은 작은 항공체에도 적용이 가능하다. 이러한 작은 시스템에서는 TCP/IP와 같이 무거운 프로토콜보다는 경량의 실시간 프로토콜이 적합하다. 본 논문에서는 RTDiP을 이용하여 ARINC 653의 통신 인터페이스 중에서 Queuing-mode를 구현하고 성능 측정을 수행한다.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.25 no.2
• /
• pp.320-326
• /
• 2021

AVTE(Air Vehicle Test Equipment) is an equipment to inspect and check the status of on-board aircraft LRUs(Line Replacement Units) before and after flight for performing successful UAV(Unmanned Aerial Vehicle) missions. This paper suggests utilization of the AVTE as an operation support-equipment by implementing several critical functions for UAV-operation on the AVTE. The AVTE easily sets initialization(default) data and compensates for the installation and position errors of the LRUs which provide critical mission data and situation image with pilots without additional individual operation support-equipment. Major fault list and situation image data could be downloaded after flight using the AVTE in the event of UAV emergency situation or unusual occurrence on duty as well. We anticipate the suggested operational approach of the AVTE could dramatically reduce the cost and man power for design and manufacture of additional operation support equipment and effectively diminish workload of the operator.