• Title/Summary/Keyword: Maneuvering performance

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Target State Estimation by Direct Estimation of Maneuvering Input (기동입력의 직접추정에 의한 표적상태 추정)

  • Kim, Jong-Hwa;Lee, Man-Hyung;Hwang, Chang-Sun
    • Proceedings of the KIEE Conference
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    • 1989.07a
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    • pp.70-74
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    • 1989
  • To track the target trajectory with maneuvers, unknown maneuvering inputs must be estimated. To do this the direct estimation algorithm using generalized least square technique is developed based on the procedure of failure detection and identification(FDI) theory. Through the simulation using maneuvering target scenario, tracking performance and efficiency of the algorithm developed here are investigated.

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An IMM Approach for Tracking a Maneuvering Target with Kinematic Constraints Based on the Square Root Information Filter

  • Kim, Kyung-Youn;Kim, Joong-Soo
    • Journal of Electrical Engineering and information Science
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    • v.1 no.2
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    • pp.39-44
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    • 1996
  • An efficient interacting multiple mode(IMM) approach for tracking a maneuvering target with kinematic constraints is described based on the square root information filter(SRIF). The SRIF is employed instead of the conventional Kalman filter since it exhibits more efficient features in handling the kinematic constraints and improved numerical characteristics. The kinematic constraints are considered in the filtering process as pseudomeasurements where the degree of uncertainty is represented by the magnitude of the pseudomeasurement noise variance. The Monte Carlo simulations for the constant speed, maneuvering target are provided to demonstrate the improved tracking performance of the proposed algorithm.

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DEVELOPMENT OF REACTOR POWER CONTROL LOGIC FOR THE POWER MANEUVERING OF KALIMER-600

  • Seong, Seung-Hwan;Kang, Han-Ok;Kim, Seong-O
    • Nuclear Engineering and Technology
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    • v.42 no.3
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    • pp.329-338
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    • 2010
  • We developed an achievable control logic for the reactor power level during a power maneuvering event and set up some constraints for the control of the reactor power in a conceptual sodium-cooled fast reactor (KALIMER-600) that was developed at KAERI. For simulating the dynamic behaviors of the plant, we developed a fast-running performance analysis code. Through various simulations of the power maneuvering event, we evaluated some suggested control logic for the reactor power and found an achievable control logic. The objective of the control logic is to search for the position of the control rods that would keep the average temperature of the primary pool constant and, concurrently, minimize the power deviation between the reactor and the BOP cycle during the power maneuvering. In addition, the flow rates of the primary pool and the intermediate loop should be changed according to the power level in order to not violate the constraints set up in this study. Also, we evaluated some movement speeds of the control rods and found that a fast movement of the control rods might cause the power to fluctuate during the power maneuvering event. We suggested a reasonable movement speed of the control rods for the developed control logic.

Performance Analysis of the Turning Acceleration Estimator, Input Estimation and Variable Dimension Filters for Tracking Maneuvers (회전가속도 추정기, 입력추정 및 가변차원 필터의 기동 추적 성능 해석)

  • Choi, Sung-Won;Lim, Sang-Seok
    • Journal of Advanced Navigation Technology
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    • v.6 no.2
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    • pp.119-129
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    • 2002
  • Maneuvering targets are difficult to track for the Kalman filter since the target model of tracking filter might not fit the real target trajectory and the statistical characteristics of the target maneuver are unknown in advance. In order to track such a highly maneuvering target, several schemes have been proposed and improved the tracking performance in some extent. Among those tracking schemes the Input Estimation (IE), Variable Dimension (VD) and Turning Acceleration Estimator (TAE) became popular. However, so far their tracking performances were analyzed individually and were not compared. In this paper, the tracking performances of the typical IE, VD and TAE schemes for a maneuvering target are compared. Monte-Carlo Simulations for three maneuvering profiles are carried out and the results are analyzed towards practical applications.

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Experimental Investigation of the Hydrodynamic Force Acting on Ship Hull and Rudder in Various Wave Direction

  • Nguyen, Van Minh;Nguyen, Tien Thua;Seo, Juwon;Yoon, Hyeon Kyu;Kim, Yeon Gyu
    • Journal of Advanced Research in Ocean Engineering
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    • v.4 no.3
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    • pp.105-114
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    • 2018
  • In the past, traditional methods of research on ship maneuvering performance were estimated in calm waters. However, the course-keeping ability and the maneuvering performance of a ship can be influenced by the presence of waves. Therefore, it is necessary to understand the maneuvering behavior of a ship in waves. In this study, the force acting on a moving ship and a rudder behind the model ship will be performed in regular waves in Changwon National University (CWNU). In addition, the prediction force acting on the rudder in calm waters was carried out and compared with those of Computational Fluid Dynamics (CFD). Model test in regular wave was performed to predict the force acting on the ship and the rudder behind the model ship in various wave directions. The effects of wavelength and wave direction on hydrodynamic forces acting on the ship hull versus rudder angle is discussed.

Target Motion Analysis for Active/Passive Mixed-Mode Sonar Systems

  • Taek, Lim-Young;Lyul, Song-Taek
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.172.5-172
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    • 2001
  • Target Motion Analysis(TMA) for Passive Sonar Systems with bearing-only measurements needs to enhance system observability to improve target tracking performance by ownship maneuvering. However, tracking problem incurred by weak observaility result in slow convergence of the target estimates. On the other hand, active sonar systems do not have problem associated with system observaility. However, it drawback related to system survivability. In this paper, the algorithm that could be used in Active/passive Mixed-Mode Sonar Systems is proposed to analyze maneuvering target motion and to improve TMA performance. The proposed TMA algorithm is tested by a series of computer simulation runs and the results ...

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A tracking filter design using input estimation in the 9-state target model (9개의 상태변수 모델에서 기동 입력 추정 기법을 사용한 추적 필터 구성)

  • 황익호;성태경;이장규;이양원;김경기
    • 제어로봇시스템학회:학술대회논문집
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    • 1991.10a
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    • pp.114-119
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    • 1991
  • An input estimation technique for tracking filter(CHP algorithm) suggested by Y.T. Chan et. al. has bad performance for low maneuvering targets. In this paper, two maneuver detection algorithms are applied to Singer's target model. First, an CHP input estimation technique is applied to 9 state target model. Second, we construct a maneuver detection and correction technique using pseudo acceleration measurements, which are derived directly from measurements. These two filters have good performance for even the low maneuvering targets.

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GA based fuzzy modeling method for tracking a maneuvering target (기동 표적 추적을 위한 유전알고리즘 기반 퍼지 모델링 기법)

  • Noh, Sun-Young;Lee, Bum-Jik;Joo, Young-Hoon;Park, Jin-Bae
    • Proceedings of the KIEE Conference
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    • 2005.07d
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    • pp.2702-2704
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    • 2005
  • This paper proposes the genetic algorithm (GA)-based fuzzy modeling method for intelligent tracking of a maneuvering target. When the maneuvering to turn or taking evasive action, the performance of the standard Kalman filter has been degraded because residual between the modeled target dynamics and the actual target dynamics. To solve this problem, the state prediction error is minimized by the intelligent estimation method. Then, this filter is corrected by measurement corrections which is the fuzzy system. The performance of the proposed method is compared with those of the input estimation(IE) technique through computer simulation.

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A practical adaptive tracking filter for a maneuvering target (시선좌표계에서의 분리추적필터를 이용한 개선된 입력추정기법)

  • 성태경;황익호;이장규;이양원;김경기
    • 제어로봇시스템학회:학술대회논문집
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    • 1992.10a
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    • pp.424-429
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    • 1992
  • A practical adaptive tracking filter for a maneuvering target is proposed in this paper by combining a modified input estimation technique with pseudo-residuals and a decoupled tracking filter in line-of-sight Cartesian coordinate system. Since the adaptive tracking filter has decoupled structure and computes maneuver input estimates for each axis separately, it requires much less computations compared with the coventional tracking filter with MIE technique without degrading performance. Also, since pseudo-measurement noises in line-of-sight Cartesian coordinate system are much less correlated compared with those of inertial Cartesian coordinate system, the proposed tracking filter produces less false alarms or miss detections to improve the performance.

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A DNA Coding-Based Interacting Multiple Model Method for Tracking a Maneuvering Target (기동 표적 추적을 위한 DNA 코딩 기반 상호작용 다중모델 기법)

  • Lee, Bum-Jik;Joo, Young-Hoon;Park, Jin-Bae
    • Proceedings of the KIEE Conference
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    • 2002.11c
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    • pp.87-91
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    • 2002
  • The problem of maneuvering target tracking has been studied in the field of the state estimation over decades. The Kalman filter has been widely used to estimate the state of the target, but in the presence of a maneuver, its performance may be seriously degraded. In this paper, to solve this problem and track a maneuvering target effectively, a DNA coding-based interacting multiple model (DNA coding-based IMM) method is proposed. The proposed method can overcome the mathematical limits of conventional methods by using the fuzzy logic based on DNA coding method. The tracking performance of the proposed method is compared with those of the adaptive IMM algorithm and the GA-based IMM method in computer simulations.

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