• Title/Summary/Keyword: Estimated Position

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A Study on the real-time Position-searching System using the Amplitude Approach Method (Amplitude Approach 방법을 이용한 신호원의 실시간 위치탐지에 관한 연구)

  • 신정록;송우영
    • Journal of the Korea Society of Computer and Information
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    • v.5 no.2
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    • pp.105-114
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    • 2000
  • In this Paper in order to break with real-time position of signal source which have first dimension motion, the N antenna is arrayed with half-circle, the incident angle of signal source from receiving power pattern to receive at receive antenna is estimated and measured, and the system that measure horizontal moving distance of signal source is designed. Signal source is constructed by 10-20dBm transmitter power which frequency is 10.52GHz of X band, and on horizontally moving the position of signal source. validity of new method is confirmed.

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A Study on the Error Compensation of Machine Tool Position Using Reference Artifact and On-Machine Probe (기준물을 이용한 공작기계 위치오차 보정기술에 관한 연구)

  • Jo, Nam-Gyu;Park, Jae-Jun;Jeong, Seong-Jong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.25 no.9
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    • pp.1317-1324
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    • 2001
  • In this paper, a methodology of geometrical error identification and compensation for NC machine tool position is developed. We propose a reference artifact with measuring the geometry of coordinate system for compensating linear scale error of NC machine. The coordinate system of the NC machine could be compensated successfully with the information obtained by measuring the reference artifact and our compensation algorithm. Monte Carlo simulation is used to evaluate coordinate referencing ability and, the uncertainties of the machine tool position is estimated and observed through the compensation process by simulation.

Model Following Adaptive Controller with Rotor Resistance Estimator for Induction Motor Servo Drives (회전자 저항 추정기를 가지는 유동전동기 구동용 모델추종 적응제어기 설계)

  • Kim, Snag-Min;Han, Woo-Yong;Lee, Chang-Goo
    • Journal of Institute of Control, Robotics and Systems
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    • v.7 no.2
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    • pp.125-130
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    • 2001
  • This paper presents an indirect field-oriented (IFO) induction motor position servo drives which uses the model following adaptive controller with the artificial neural network(ANN)-based rotor resistance estimator. The model reference adaptive system(MRAS)-based 2-layer ANN estimates the rotor resistance on-line and a linear model-following position controller is designed by using the estimated the rotor resistance value. At the end, a fuzzy logic system(FLS) is added to make the position controller robust to the external disturbances and the parameter variations. The simulation results show the effectiveness of the proposed method.

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LOS (Line of Sight) Algorithm and Unknown Input Observer Based Leader-Follower Formation Control (LOS 알고리듬과 미지 입력 관측기에 기초한 선도-추종 대형 제어)

  • Yoon, Suk-Min;Yeu, Tae-Kyeong;Park, Seong-Jea;Hong, Sup;Kim, Sang-Bong
    • Journal of Institute of Control, Robotics and Systems
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    • v.16 no.3
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    • pp.207-214
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    • 2010
  • This paper proposes about decentralized control approach based Leader-Follower formation control using LOS (Line of Sight) algorithm and unknown input observer. The position of robots which is a basic information in multi-robot or single robot motion control is determined by localization algorithm fusing UPS (Ultrasonic Position System) and kinematics model. For formation control, a decentralized control approach individually installing a local controller in leader and follower robot is adopted. Leader robot is controlled to track a specified trajectory by LOS algorithm, and the other robots follow the leader by local controller based on tracking platoon level function, self-sensing data and estimated information from unknown input observer. The performance of proposed method is proven through the formation experiment of two vehicle models.

Alternative Positioning, Navigation and Timing Using Multilateration in a Terminal Control Area (접근관제구역에서 다변측정감시시스템을 이용한 대안항법 방안 연구)

  • Jo, Sanghoon;Kang, Ja-young
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.23 no.3
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    • pp.35-41
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    • 2015
  • Multilateration(MLAT) is commonly used in civil and military surveillance applications to accurately locate an aircraft, vehicle or stationary emitter. MLAT calculates the TDOA of signals by transmitted aircraft and determines the aircraft's location. With more than four receivers it is possible to estimate the 3D position of the aircraft by calculating the intersection of the resulting hyperbolas and the system integrity. In this study, our objectives are to apply MLAT technique to Jeju terminal control area and to propose a MLAT receiver network to properly estimate the positions of aircraft approaching this area. Based on computer simulations, we determine locations of ground receivers in Jeju terminal control area, calculate estimated position errors of the aircraft with respect to the selected receiver networks, and find the best receiver network with the least position error.

Sensorless Control of Permanent Magnet Synchronous Motors with Compensation for Parameter Uncertainty

  • Yang, Jiaqiang;Mao, Yongle;Chen, Yangsheng
    • Journal of Electrical Engineering and Technology
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    • v.12 no.3
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    • pp.1166-1176
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    • 2017
  • Estimation errors of the rotor speed and position in sensorless control systems of Permanent Magnet Synchronous Motors (PMSM) will lead to low efficiency and dynamic-performance degradation. In this paper, a parallel-type extended nonlinear observer incorporating the nominal parameters is constructed in the stator-fixed reference frame, with rotor position, speed, and the load torque simultaneously estimated. The stability of the extended nonlinear observer is analyzed using the indirect Lyapunov's method, and observer gains are selected according to the transfer functions of the speed and position estimators. Taking into account the parameter inaccuracies issue, explicit estimation error equations are derived based on the error dynamics of the closed-loop sensorless control system. An equivalent flux error is defined to represent the back Electromotive Force (EMF) error caused by the inaccurate motor parameters, and a compensation strategy is designed to suppress the estimation errors. The effectiveness of the proposed method has been validated through simulation and experimental results.

Position Location of Mobile Terminal in Wireless MIMO Communication Systems

  • Li, Ji;Conan, Jean;Pierre, Samuel
    • Journal of Communications and Networks
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    • v.9 no.3
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    • pp.254-264
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    • 2007
  • A promising approach to improve the performance of mobile location system is the use of antenna arrays in both transmitter and receiver sides. Using advanced array signal processing techniques, such multiple-input multiple-output (MIMO) communication systems can offer more mobile location information by exploiting the spatial properties of the multipath channel. In this paper, we propose a novel approach to determine the position of mobile terminal based on estimated multipath signal parameters using only one base station in MIMO communication systems. This approach intends to minimize the error occurring from the estimation of multiple paths and gives an optimal estimation of the position of mobile terminal by simultaneously calculating a set of nonlinear location equations. This solution breaks the bottleneck of conventional mobile location systems which have to require multilateration of at least three base stations.

Position Control of Magnetic Levitation Transfer System by Pitch Angle

  • Liu Ming-Zhao;Tsuji Teruo;Hanamoto Tsuyoshi
    • Journal of Power Electronics
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    • v.6 no.3
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    • pp.264-270
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    • 2006
  • Magnetic levitation transfer systems are useful for transfer tools in clean rooms and positioning control systems with high precision because of frictionless characteristics. In this paper, the new method is proposed which is a sensorless position. At first, the magnetic levitation is performed by state feedback control with a disturbance observer for each of six axes of the movement of a levitated vehicle. The position of the vehicle is then estimated as the disturbance term of a disturbance observer for a pitch angle which is one of the control axes for the magnetic levitation. In addition, the positioning force is generated by the pitch angle control which gives a tilt to the levitated vehicle so that it generates the horizontal component of force.

Sensorless Control of Double-Sided Linear Switched Reluctance Machines with Eccentricities

  • Wang, Qianlong;Wu, Zhengfei;Jiang, Wei
    • Journal of Power Electronics
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    • v.19 no.5
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    • pp.1216-1223
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    • 2019
  • The Double-sided Linear Switched Reluctance Machine (DLSRM) suffers from complex eccentricities in practical operations. A novel sensorless control method for a DLSRM with eccentricities is developed in this paper. The influences of eccentricities on the machine inductance characteristics and the estimated positions in sensorless control systems are discussed. A new position index, which is independent of eccentricities, is proposed according to an analysis of a DLSRM equivalent magnetic circuit. On the basis of this position index, the starting and low-velocity operation of eccentric DLSRMs are achieved. Experimental results obtained in the laboratory validate the proposed method.

Study of Shorted-turn for Cylindrical Synchronous Generator Rotor (원통형 동기발전기 회전자의 층간단락에 관한 연구)

  • Kim, Young-Jun;Kim, Jang-Mok;Lee, Sang-Hyuk;Ahn, Jin-Woo
    • Journal of the Korean Society of Safety
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    • v.21 no.2 s.74
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    • pp.52-56
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    • 2006
  • This paper describes the methods for the detection of shorted-turn in the rotor of a cylindrical synchronous generator. A search coil is installed in the air-gap to detect the shorted-turn. The occurrence of a fault in the rotor winding results in a decrease of the induced voltages in the stator. And the magnitude of the rotor flux can be estimated by using the search coil and the estimated stator voltages respectively. And the magnitude of the estimated rotor flux is used for discriminating the rotor windings short or not by detecting the magnitude of the rotor flux. The method using a search coil located in the air-gap can detect not only the occurrence of a turn fault but also its position in the rotor winding. But the method using the estimated stator voltages gives the magnitude of the rotor flux, and only the number of a short-turn.