• Journal of information and communication convergence engineering
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• 제16권2호
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• pp.78-83
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• 2018

Rapidity and accuracy are important considerations when a drone is employed in a wide surveillance area to detect a target. They are more important when the scope of application is a search and rescue operation or the monitoring of natural disasters, which may require prompt warnings and response. During the actual operation of a drone, rapidity and accuracy are associated with the change in the altitude of the drone. The aim of this study is to analyze the characteristics of drones at varying altitudes and prove that altitude is a relevant factor in the performance of drones. Herein, the characteristics of the drone at varying altitudes were analyzed through several search simulations. The results suggest that a high-altitude drone is relatively advantageous compared to a low-altitude drone in a probability-based target search, and that the search altitude is also a very important and fundamental factor in target search by drones.

• 한국멀티미디어학회논문지
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• 제22권10호
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• pp.1178-1186
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• 2019

In recent years, interest in drones has grown, and many countries are developing them into a strategic industry of the future. Drones are not only used in industries such as logistics and agriculture but also in various public sectors such as life rescue, disaster investigation, traffic control, and firefighting. One of the most important tasks of a drone is to accurately identify targets in these applications. Target recognition may vary depending on the search environment of the drone. Therefore, this study tests and analyzes the drone's target recognition performance according to changes in the search environment such as the search altitude and the search angle. In addition, we propose a new algorithm that improves upon the disadvantages of the Haar cascade method, which is the existing algorithm that recognizes the target by analyzing a captured image.

• 한국정보통신학회논문지
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• 제21권12호
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• pp.2371-2379
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• 2017

넓은 탐색영역에서 활동하는 드론에서 신속한 처치를 요하는 응급환자의 탐색, 신속한 경보와 대응을 요하는 자연재해의 감시와 같은 응용 분야에서 목표물 파악의 시간(time), 즉 신속성의 문제는 매우 중요한 문제가 된다. 드론의 실제 운영에 있어서 목표물을 파악하는 시간은 탐색 영역을 효율적으로 탐색하기 위한 탐색 알고리즘 및 드론 간의 협업과 매우 연관성이 깊다. 따라서 본 연구에서는 드론을 이용한 목표물 탐색에 있어서 신속성의 문제를 해결하기 위하여, 고도를 달리하는 드론들의 협력에 의한 확률기반 목표물 탐색 방법을 제안한다. 특히 제안한 방법은 고(高)고도 드론이 우선 탐색을 실시하고, 탐색 결과를 저(低)고도 드론에 전달하여 보다 정밀한 탐색을 함으로써 탐색 시간을 줄이고 목표물 발견의 확률을 높이는 방법이다. 시뮬레이션을 통하여 제안된 방법의 성능을 분석한다.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2010년 춘계학술대회논문집
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• pp.17-20
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• 2010

An aerial target system is used for the purpose of experimental test and fire training of missile that newly developed and in mass production. Since the target drones of aerial target systems are monopolized by several major countries so that they are selling at a high price. In this paper, we present the CFD simulation results on a new target drone that Kyungan co. ltd is developing with their own technologies. The presented CFD simulation was conducted in the same conditions of a wind tunnel tests and we could obtain the simulation results of the lift and drag values were in errors by less than 15 percent compared to the experiment. The simulation results were used to determine the modified shapes of new prototype target drone that could fly safely.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.367-371
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• 2004

This paper describes development of automatic flight control system for an unmanned target drone which is operated by Korean army as for anti-air gun shooting training. Current target drone is operated by pilot control of on-board servo motor via remote control system. Automatic flight control system for the target drone greatly reduces work load of ground pilot and can increase application area of the drone. Most UAVs being operated now days use high-priced sensors as AHRS and IMU to measure the attitude, but those are costly. This paper introduces the development of low-cost automatic flight control system with low-cost sensors. The integrated automatic flight control system has been developed by integrating combining power module, switching module, monitoring module and RC receiver as an one module. The performance of automatic flight control system is verified by flight test.

• 대한임베디드공학회논문지
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• 제16권5호
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• pp.163-169
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• 2021

In this paper, we implemented a deep learning-based automatic object tracking and handy motion control drone system and analyzed the performance of the proposed system. The drone system automatically detects and tracks targets by analyzing images obtained from the drone's camera using deep learning algorithms, consisting of the YOLO, the MobileNet, and the deepSORT. Such deep learning-based detection and tracking algorithms have both higher target detection accuracy and processing speed than the conventional color-based algorithm, the CAMShift. In addition, in order to facilitate the drone control by hand from the ground control station, we classified handy motions and generated flight control commands through motion recognition using the YOLO algorithm. It was confirmed that such a deep learning-based target tracking and drone handy motion control system stably track the target and can easily control the drone.

• International Journal of Aeronautical and Space Sciences
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• 제13권4호
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• pp.468-473
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• 2012

Cost is an important aspect in designing a target drone, however the poor performance of low cost IMU, GPS, and microcontrollers prevents the use of complex algorithms, such as ARS, or INS/GPS to estimate attitude angles. We propose an autopilot which uses rate gyro and GPS only for a target drone to follow a prescribed path for anti-aircraft training. The autopilot consists of an altitude hold, roll hold, and path following controller. The altitude hold controller uses vertical speed output from a GPS to improve phugoid damping. The roll hold controller feeds back yaw rate after filtering the dutch roll oscillation to estimate the roll angle. The path following controller operates as an outer loop of the altitude and roll hold controllers. A 6-DOF simulation showed that the proposed autopilot guides the target drone to follow a prescribed path well from the view point of anti-aircraft gun training.

• International Journal of Advanced Culture Technology
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• 제11권2호
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• pp.381-388
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• 2023

Small-scale environmental impact assessments have limitations in terms of survey duration and evaluation resources, which can hinder the assessment and analysis of the current situation. In this study, we propose the use of drone technology during the environmental impact assessment process to supplement these limitations in the current situation analysis. Drone photography can provide rapid and accurate high-resolution images, allowing for the collection of various information about the target area. This information can include different types of data such as terrain, vegetation, landscape, and real-time 3D spatial information, which can be collected and processed using GIS software to understand and analyze the environmental conditions. In this study, we confirmed that terrain and vegetation analysis and prediction of the target area using drone photography and GIS analysis software is possible, providing useful information for environmental impact assessments.

• 항공우주시스템공학회지
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• 제18권3호
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• pp.76-85
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• 2024

최근 전 세계적으로 볼 때 소형 무인기에 의한 테러 및 전쟁 활용도가 높아지고 있어 소형 무인기를 대상으로 하는 대공 사격 훈련의 필요성이 더욱 대두 되고 있는 반면, 실제 우리나라의 대공 표적기 사격 훈련은 소음 등의 민원으로 인해 제한되는 사례가 많다. 본 논문에서 효율적인 대공 사격 훈련과 사격장 소음 민원의 해소를 위한, 전기 동력 기반의 직접 타격 형 고속 저소음 소형 대공 표적기의 개발 및 시험 내용을 설명한다. 사격 훈련 시 요구되는 비행 속도 및 비행시간 만족을 위해 비행체 사이징을 수행하고, 해석 프로그램을 사용하여 공력 성능 해석을 수행하였다. 성능해석을 바탕으로 모터 추진시스템 선정 및 가변피치 프로펠러 시스템 설계를 수행하여 성능 시험을 지상시험장치에서 수행 하였고, 최종적으로 비행 시험을 통해 목표 비행 속도, 비행시간 및 비행 소음도를 확인 하였다.

• 한국군사과학기술학회지
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• 제21권2호
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• pp.147-157
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• 2018

There are increasing demands to provide early warning against intruding drones and cope with potential threats. Commercial anti-drone systems are mostly based on simple target detection by radar reflections. In real scenario, however, it becomes essential to obtain drone radar signatures so that hostile targets are recognized in advance. We present experimental test results that micro-Doppler radar signature delivers partial information on multi-rotor platforms and exhibits limited performance in drone recognition and classification. Afterward, we attempt to generate high resolution profile of flying drone targets. To this purpose, wide bands radar signals are employed to carry out inverse synthetic aperture radar(ISAR) imaging against moving drones. Following theoretical analysis, experimental field tests are carried out to acquire real target signals. Our preliminary tests demonstrate that high resolution ISAR imaging provides effective measures to detect and classify multiple drone targets in air.