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다중센서 환경에서 항공교통관제를 위한 표적추적필터기법 연구
송택렬,김형원,박효달 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.11
항공교통관제의 추적환경은 다수의 비동기 레이더기지로부터 3차원 위치데이터(거리, 방위각, 고도) 또는 2차원 위치데이터(거리, 방위각)가 측정되며, 항공기가 저고도로 비행을 하는 경우 multi-path의 영향으로 레이더의 신호처리 과정에서 가짜표적 측정치인 클러터가 발생하기 쉽고, 또한 추적대상이 되는 항공기는 level flight과 이/착륙을 위한 다양한 기동패턴을 가진다. 본 논문에서는 이러한 복잡한 항공기 추적환경에서 보다 효과적인 항공기 추적을 하기위하여 ASF와 IMM-PDAF를 이용한 융합필터를 설계하고 그 성능을 분석하였다. In tracking environments of Air Traffic Control(ACT), 3D geometry information(range, azimuth and altitude) or 2D geometry information(range, azimuth) of airplanes are measured from asynchronous radar sites. When airplane flies in a low altitude, the radar may measure non-target oriented detections, i.e.,clutter measurements due to multi-path effects generated by interaction of beams reflected from the airplane and the ground. Futhermore airplane has maneuvering patterns for take-off and landing. In this paper, the asynchronous serial fusion method and the IMM-PDAF are used for effective airplane tracking in such challenging environments and analyze its performance through Monte Carlo simulation studies.
클러터 환경에서 레이더 시스템의 표적 포착 시간 예측 기법
송택렬,신정훈,최영진 대한전기학회 2022 전기학회논문지 Vol.71 No.4
A radar system generally operates a signal and data processing chain, which consists of detection, confirmation, lock-on, and tracking, to seek a target within a region of interest. The performance of target lock-on depends on a confirmation method, and the lock-on time for a target is a crucial design parameter in terms of efficient resource management of a radar system in cluttered environments. This paper presents a target lock-on time prediction method based on the probability of target existence with Markov chain-2 model and its applicability in cluttered environments via computer simulation.
송택렬,윤석필,김태한 제어·로봇·시스템학회 2013 International Journal of Control, Automation, and Vol.11 No.1
This paper presents a technique for automatic airborne target recognition and tracking in forward-looking infrared (FLIR) images with a complex background. An image splitting and merging method is applied for detecting target signals. The presence of a complex background due to clouds and sun glint generates clutter in the image with the resulting possibility of false alarms. A Bayesian classifier trained using the NMI (normalized moment of inertia) feature is proposed for efficient clutter rejection. After classification, target candidates are entered into a tracking filter. As an efficient and robust multi-target tracking filter in cluttered environments, the JDC-JIHPDAF is proposed. Experimental results using a wide range of real FLIR images ensure reliable classification and automatic target recognition performance.
송택렬,신상진 한국군사과학기술학회 1998 한국군사과학기술학회지 Vol.1 No.1
As a part of trajectory modulation to increase system survivability and terminal effectiveness, impact angle control is required in the terminal phase of tactical missile systems. The missile systems are not allowed to have high altitude to reduce probability of detection by sensors of missile defense systems. In this paper, an analytic form of a time-optimal control law is suggested in the case of constrained missile maneuverability and impact angle under the assumption of a zero-lag autopilot. The control law is obtained by establishing optimal missile-target engagement geometry in the vertical plane. Extension of the law for missiles with autopilot response lags requiring a numerical solution is studied by introducing an iterative algorithm for optimal switching time determination of which the initial switching instants are obtained from the analytic solution. Also suggested is a closed-form impact angle control law derived by an energy-optimal approach. The performances of the proposed guidance laws are evaluated by a series of computer runs.
송택렬 漢陽大學校 工學技術硏究所 1997 工學技術論文集 Vol.6 No.1
Lateral steering dynamics are analyzed for a rolling airframe missile with asymmetric control configuration. In particular, pich and yaw coupling is clarified in the presence of phase lags induced by an actuator and a rate gyro. Base on the analysis, a gain scheduling method is proposed for guidance and control. The approach taken in this paper is different from previous work and practical in the respect that it utilizes a body axis coordinate system on which actual aerodynamic forces and moments generated from control fans and guidance commands from an on board seeker are based.