• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.48 no.2
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• pp.159-166
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• 2020

In this paper, we propose a heterogenous mission allocation technique for multi-UAV system based on discrete event modeling. We model a series of heterogenous mission creation, mission allocation, UAV departure, mission completion, and UAV maintenance and repair process as a mathematical discrete event model. Based on the proposed model, we then optimize the number of UAVs required to operate in a given scenario. To validate the optimized number of UAVs, the simulations are executed repeatedly, and their results are analyzed. The proposed mission allocation technique can be used to efficiently utilize limited UAV resources, and allow the human operator to establish an optimal mission plan.

• Journal of the Institute of Electronics and Information Engineers
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• v.54 no.7
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• pp.3-11
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• 2017

UAV system has the limitation to allocate enough spectrum bandwidth for the operation of multiple UAVs due to the market expansion. In addition, the communication environment of UAV network varies dynamically due to the UAV's mobility. Thus, to operate the stable UAV system and maximize the transmission data rate, it needs to allocate the resource effectively in the limited bandwidth considering the given network environment. In this paper, we propose the resource allocation algorithm which can maximize the network throughput as well as satisfy the minimum data requirement for the UAV system operation in the given network environment based on TDMA(Time Division Multiple Access). By performance analysis, we show that the proposed algorithm can allocate the resource to satisfy the high network throughput as well as the minimum data requirement in the given network environment.

• Journal of Convergence for Information Technology
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• v.11 no.12
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• pp.97-105
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• 2021

Countries such as the United States, Russia, and Europe are developing and operating UAVs for various purposes, including stealth UAVs. North Korea is also operating unmanned aerial vehicles, and it is presumed that it is continuously flying south of the demarcation line to obtain information on the national security zone, but it is difficult to detect and neutralize it effectively. Therefore, this paper analyzed the military UAV development trends and military radar specifications in Western countries such as the United States and communist countries such as Russia, China, and North Korea through literature research. In addition, based on the investigation of the AESA radar-based UAV response system in the country, not only general responses but also countermeasures such as direct strike and electromagnetic pulses to North Korean UAVs that cannot be jammed were suggested.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.24 no.3
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• pp.364-370
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• 2020

This paper is related to detection and classification for micro-sized aircraft that flies at low-altitude. The deep-learning based method using sounds coming from the micro-sized aircraft is proposed to detect and identify them efficiently. We use MFCC as sound features and CNN as a detector and classifier. We've proved that each micro-drones have their own distinguishable MFCC feature and confirmed that we can apply CNN as a detector and classifier even though drone sound has time-related sequence. Typically many papers deal with RNN for time-related features, but we prove that if the number of frame in the MFCC features are enough to contain the time-related information, we can classify those features with CNN. With this approach, we've achieved high detection and classification ratio with low-computation power at the same time using the data set which consists of four different drone sounds. So, this paper presents the simple and effecive method of detection and classification method for micro-sized aircraft.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.507-509
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• 2015

본 논문에서는 다수의 공중무인기로 구성된 이동센서네트워크를 이용하여 유해 지역 또는 인력 접근이 제한된 지역 감시를 고려한다. 공중무인기는 기존 무인기와 달리 이동 제약이 적으며 기동성이 뛰어나 다양한 분야에서 활용이 가능하다. 그러나 다수의 공중무인기를 이용하여 센서네트워크 구축할 경우 지상 관제센터의 한정된 자원으로 인해 개별 공중무인기 제어에 한계가 있다. 따라서 최소한의 중앙 제어를 통한 신속한 네트워크 구축, 관심 지역으로 위치 이동 그리고 자율적 협업을 통한 센싱커버리지 최대화를 위한 알고리즘이 요구된다. 본 논문에서는 공중무인기의 제한된 센싱 거리와 통신 거리를 바탕으로 다수의 공중무인기를 이용한 가상력 기반 협력 감시 네트워크 구성을 고려한다. 또한 시뮬레이션을 통해 관리자의 별도의 제어 없이 다수 공중무인기의 자율 감시 네트워크를 구축과 지역 감시가 가능함을 보인다.

• Journal of Advanced Navigation Technology
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• v.21 no.1
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• pp.145-152
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• 2017

As a popularization of small UAS to have improved flight performance and easiness of controlling, the UAS industry is increased and also small UAS is to be a new threat for airspace security of national strategic infrastructure. Rising the new threat makes the negative side effect of small UAS operation. This phenomena brought to new R&D needs "defense system" for small UAS/UAV - called Anti-Drone. The paper addressed case study of defects, accidents and threats by small UAS/UAV as world wide level, and research and development trend of UAS defense system as each technical category - CONOP (Concept of Operation), identification/recognition method and control/supremacy techniques. As a result, this suggests the direction what and where drone defense system should be applied first and required for Korean society in the view of society system (regime) and a point of view for minimizing side effect as UAS popularization.

• Aerospace Industry
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• s.106
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• pp.64-65
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• 2010

현대전에서 이제 빼놓을 수 없는 전략 중 하나가 바로 무인기. 특히 무인기 운용이 대폭 늘면서 크고 작은 다양한 무인기들이 전장의 하늘을 점령하고 있다. 이번 호에서는 작은 덩치에도 불구하고 해상 및 육상 전력의 매서운 눈 역할을 하고 있는 스캔이글에 대해 알아본다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.36 no.6
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• pp.565-573
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• 2008

The behavior-based decentralized approach is considered for multi-UAV formation flight. It is assumed that each UAV has its own mission of flying to a specified region, while the distances between UAVs should be maintained. These two requirements may conflict with each other. To design the controller, coupled dynamics approach is applied to multi-UAVs with an assumption that each UAV can communicate with each other to share the state-information. Control gain matrices are optimized to acquire better performances of formation flying. To validate the proposed control approach, numerical simulation is performed for the waypoint-passing mission of multi-UAVs.

• Journal of Aerospace System Engineering
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• v.15 no.1
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• pp.56-62
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• 2021

The purpose of this study was to address a Remote Airborne Control Simulator that could simulate manned-unmanned teaming (MUM-T mission) for fixed wing UAV. With rapid technological development of unmanned aerial vehicle (UAV), the mission capability of UAV has tremendously grown. The role of UAV extends from simple reconnaissance to highly automated wingman. Accordingly, the requirement of UAV ground simulator should be modified as well to meet function requirements for simulating a MUM-T mission. A developed remote airborne control simulator was developed for conducting fixed wing UAV MUM-T operation simulations on the ground. The newest MUM-T examples, usage, and application of the developed remote airborne control simulator for MUM-T simulation are also presented in this study.

• Transactions of the KSME C: Technology and Education
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• v.4 no.2
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• pp.117-122
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• 2016

Ecumenically, RPAS(Remotely Piloted Aircraft System) operation has been increased and the related accidents also have occurred. Accordingly, national authorities, organizations and industry have been striving for amendment and enactment of policy and regulation related to the RPAS(Remotely Piloted Aircraft System) operation. And ICAO had performed the joint study to make international standards through UASSG(Unmanned Aerial System Study Group). Recently this group has been switched to the panel meeting, RPASP(Remotely Piloted Aircraft System Panel). It has been discussed to make the related annex, SARPs(Standards and Recommended Practices) and etc. in RPASP. In this paper, we investigated the trend of study and development for ICAO RPAS policy and regulation. Based on these results, we suggested considerations to prepare domestic policy and regulations.