• 대한전기학회논문지:전력기술부문A
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• 제48권7호
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• pp.881-888
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• 1999

Target pointing guidance steers a vehicle to point at a target point at a given range Rs. In this paper, vehicle's motions relative to the target point are modeled by differential equations. Then a target pointing guidance law is derived using optimal control theories. In addition, it is shown that the proposed guidance law can achieve the goal of target pointing guidance whatever initial headings are.

• 한국군사과학기술학회지
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• 제12권6호
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• pp.750-759
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• 2009

FLIR(Forward Looking Infrared) geo-pointing is a function that helps pilots to see a target within the field of view under all coordinates and attitudes of helicopter. Geo-pointing controls FLIR LOS(line of sight) toward known target coordinates by using azimuth and elevation angles calculated from several information such as helicopter coordinates and attitudes, a FLIR position from a GPS antenna, and target coordinates. Geo-pointing performance has been tested and evaluated on the ground to save flight test costs and ensure flight safety. In this paper, design and implementation of a geo-pointing system is described with the results of performance test conducted on the ground test system.

• 제어로봇시스템학회논문지
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• 제8권1호
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• pp.60-66
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• 2002

In this paper, a new target pointing guidance algorithm is proposed by combining the optimal target pointing solution and a simple time-to-Go estimator. Also investigated are some properties of the guidance algorithm which include a relation to conventional PNG, convergence region and convergence trajectories of error states according to the time-to-go estimator gain. Some guidelines for designing the pointing guidance law are commented based on the convergence properties. A design example in the case of large initial heading errors is presented and its performance is investigated by simulation.

• 한국군사과학기술학회지
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• 제16권2호
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• pp.191-198
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• 2013

Geo-pointing is a function that maintains LOS(Line of Sight) to a stationary ground target by controlling azimuth and elevation angles of a EOS(Electro-Optical System) which are calculated from aircraft navigation data and target coordinates. In design and implementation of the geo-pointing, a transmission time delay between GPS/INS and EOS is a major degradation factor of the geo-pointing performance when the aircraft is rapidly maneuvered especially. In this paper, a kalman filter is designed to compensate the transmission time delay of aircraft navigation data. Simulation and test results show that the geo-pointing performance is enhanced by the proposed compensation technique.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2009년도 IWAIT
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• pp.290-293
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• 2009

In this paper, we propose a method to estimate pointing region in real-world from images of cameras. In general, arm-pointing gesture encodes a direction which extends from user's fingertip to target point. In the proposed work, we assume that the pointing ray can be approximated to a straight line which passes through user's face and fingertip. Therefore, the proposed method extracts two end points for the estimation of pointing direction; one from the user's face and another from the user's fingertip region. Then, the pointing direction and its target region are estimated based on the 2D-3D projective mapping between camera images and real-world scene. In order to demonstrate an application of the proposed method, we constructed an ICGS (interactive cinema guiding system) which employs two CCD cameras and a monitor. The accuracy and robustness of the proposed method are also verified on the experimental results of several real video sequences.

• 한국전자파학회논문지
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• 제21권12호
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• pp.1412-1422
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• 2010

펄스 체이싱을 이용한 바이스태틱 레이더는 탐지 영역을 효과적으로 스캔하기 위해 수신 빔을 이용하여 송신 펄스를 추적함으로써 표적을 탐지한다. 수신 빔을 이용한 펄스 추적시 펄스-펄스간 빔 포인팅 오차에 의해 수신 펄스의 타이밍 오차와 신호 세기의 변화가 발생할 수 있다. 본 논문에서는 수신 빔 포인팅 오차에 의해 발생된 에러가 MTI 필터의 성능을 제한할 수 있음을 제안하였고, 바이스태틱 구조만의 고유한 특성인 기하학적 요소와 MTI 성능의 관계식을 유도하였다. 시뮬레이션을 통해 수신 빔 조향 오차에 의한 개선 성능 제한을 고찰하였고, 수신 빔의 조향 오차를 0.5도 이하로 유지함으로써 성능 개선에 기여할 수 있음을 확인하였다.

• 대한의용생체공학회:의공학회지
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• 제28권3호
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• pp.417-422
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• 2007

In this study, we investigated spatio-temporal eye-hand coordination by the "Global effect paradigm", a target-distracter configuration Global effect is observed a variety of visual tasks, for example, during rapid automatic tracking, scanning for target detail, and the comparison of target configurations. Global effect used to investigate eye-hand coordination with a task that presents a target close to a distracter. Eight young subjects participated in the experiments. The experiments consist of using a distracter less eccentric than the targe1 and using a distracter more eccentric than target. Each experiment consist of tasks which are making reference, pointing the target with watching visual stimulation(saccade) and pointing the target. The subject's task was to move towards the target as quickly as possible. We measured the eye movement by using EOG and the hand movement by using NDI Optotrak system. This study shows that eye and hand movement exists for global effect paradigm in spatio-temporal coordination.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.99-99
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• 2000

An effect ive filter algorithm that can manage radar beam pointing efficiently is needed to track multi-target in the air. For effective beam management the filter has lobe good enough to predict future position of target and based on this filter output radar beam is control led to point toward the predicted target position in the air. In this paper, we investigate the ${\alpha}$-${\beta}$ filter known for its brief filter structure with the steady-state Kalman filter gain, the ruv filter, and the coordinate-transformed filter that can decouple the measurement noise variance.

• 전자공학회논문지CI
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• 제48권5호
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• pp.1-7
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• 2011

전자광학추적장비는 영상신호를 이용하여 이동하는 목표물을 추적하며 안정화된 영상을 제공하는 장비이다. 또한, 특정 위치를 자동으로 관측하는 좌표지향 기능을 수행한다. 좌표지향은 항공기의 급격한 기동이나 외란 등의 외적 요인에 방해받지않고 시선을 지향점에 고정하도록 하는 기능이다. 본 논문에서 좌표지향시의 주요 오차 요소들의 영향을 검토하여 항법정보의 전송지연이 주요 오차임을 확인하였다. 또한 지연된 항법정보로부터 현재 항공기의 항법정보를 추정하기 위해 병합칼만필터를 설계하였다. 실제 항공기의 비행데이터를 이용한 시뮬레이션을 통해 제안한 방법이 전송지연으로 인한 좌표지향 오차를 절반 이하로 줄일 수 있음을 보였다.

• 대한전자공학회논문지SP
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• 제45권2호
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• pp.29-36
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• 2008

본 논문에서는 취득된 영상으로부터 실세계 지시 영역을 추정하는 방법을 제안한다. 일반적으로 사람은 무엇인가를 지시할 경우, 얼굴 방향을 목표물에 두게 된다. 따라서 얼굴영역과 손끝 영역을 연결한 직선을 지시방향이라 간주하였다. 먼저, 제안된 알고리듬은 2대의 카메라로부터 실시간으로 얻어진 영상에서 피부색 검출을 통해 사용자의 얼굴 및 손끝영역에서 2점을 추출하고, 이를 실세계 3차원 기하학 정보를 이용하여 지시방향 및 지시영역을 추정한다. 또한 제안된 알고리듬을 이용한 정확한 지시영역 추출을 기반으로 두 대의 카메라와 한 대의 빔 프로젝터로 구성된 '양방향 영화정보 안내 시스템(ICIGS: Interactive Cinema Information Guiding System)'을 구성하여 제안된 알고리듬의 실용화 가능성을 확인하였다.