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論文(논문) : VHF 대양 네트워크를 위한 Ad-hoc 기반 다중접속기법
구자열 ( Ja Yeul Koo ),백호기 ( Ho Ki Baek ),임재성 ( Jae Sung Lim ) 한국항공운항학회 2013 한국항공운항학회지 Vol.21 No.1
In oceanic flight routes, HF radio and satellite data links have weather restrictions, long propagation delay and low data throughput. In this paper, we propose oceanic aeronautical communications scheme in the VHF band based on ad-hoc communication. The proposed scheme organizes autonomously a multi-hop network that is divided into multiple local network using aircraft to fly long-distance communication and supports a hybrid type of multiple access, which consists of random access and TDMA (Time Division Multiple Access) scheme. In addition, several algorithms to apply spatial reuse of transmission to multi-hop long range communication environments have been proposed. The proposed system proves performance improvement on delay time as an effective solution to communicate end-to-end on the oceanic flight routes and strengthens the reliability of oceanic aeronautical communication.
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대양항로에서 장거리 공대지통신을 위한 VHF Relay Network
구자열 ( Ja Yeul Koo ) 한국항공운항학회 2012 한국항공운항학회지 Vol.20 No.3
In oceanic flight routes, HF radio and satellite data links have been used for air-to-ground communication, but these systems have long propagation delay and low data throughput. In this paper, we propose a reliable system to overcome the weakness of current HF radio and satellite communication systems for oceanic aeronautical flight routes. The proposed scheme uses only one aeronautical VHF channel in multi-hop oceanic communication environments and supports a hybrid type of multiple access, which consists of random access and TDMA (Time Division Multiple Access) scheme. The proposed system improves performance on delay and throughput as an effective solution to communicate end-to-end on the oceanic flight routes and strengthens the reliability of oceanic aeronautical communication.
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공군 전장 환경에서 효과적 주파수 관리를 위한 Spectrum COP 설계 제안
구자열(Ja-yeul Koo) 한국통신학회 2012 韓國通信學會論文誌 Vol.37 No.11B
최근 제한된 주파수자원을 효율적으로 활용하기 위해 주파수 공유와 사용 자유화 방안에 대한 연구가 진행되고 있다. 전투요소의 충분한 상호운용성과 실시간 작전속도를 요구하는 네트워크 중심전이 현대전의 중요한 특징으로 부각되고 있는 가운데 무선통신환경에서 제한된 주파수자원의 효과적 관리방안이 군사적으로 연구되고 활용되고 있다. 본 논문에서는 공군 전장 환경에서 효과적 주파수 관리를 위한 주파수 공통상황도 설계를 제안한다. 공군의 주파수 공통상황도를 구축하기 위하여 요구사항을 분석하고 EA(Enterprise Architecture) 프레임워크를 사용하여 주파수 관리 모델을 설계한다. 설계 결과는 공군의 통합방공작전분석모델을 활용하여 그 실효성을 입증한다. Recently, several researches are focused on the frequency sharing and the liberalization of frequency use for utilizing the limited frequency resources efficiently. In military, as Network Centric Warfare(NCW), which requires significant mutual operability of battle elements and real-time operation speed, has come to the fore front as an important aspect of modern warfare, the methods to manage limited frequency resources in wireless communications environment efficiently has been studied and utilized. In this paper, we propose a Spectrum COP(Common Operation Picture) design suitable for the battlefields of air force. To construct the Spectrum COP of Air Force, we analyze the requirements and design the frequency management system by using EA(Enterprise Architecture) Framework. The simulation results of the proposed design proved the effectiveness by using EADSIM(Extended Air Defense Simulation) of Air Force.
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