• 제목/요약/키워드: Time Delay

검색결과 6,761건 처리시간 0.035초

AR 모델을 이용한 이동 통신 채널의 시간 지연 해석기법에 관한 연구 (A Study on Analysis of Time Delay Model Using Autoregressive Method for Mobile Communication Channels)

  • 이형권;류은숙;이종길
    • 대한전자공학회:학술대회논문집
    • /
    • 대한전자공학회 1999년도 하계종합학술대회 논문집
    • /
    • pp.29-32
    • /
    • 1999
  • In this study, the time delay model were simulated using the well-known AR model. Frequency response of the time delay model can be obtained by mapping AR model to JTC model in the time domain. That is, from the few measurement data in JTC model, the channel frequency response can be obtained by the estimation of AR model parameters. From this channel frequency response, the time delay model can be obtained using Fourier transformation. To prove the validity of the suggested method, three models of JTC were shown and analyzed.

  • PDF

인체감지 센서의 시간지연 설정 (Automatic setting of delay time of an occupancy sensor using an adder circuit)

  • 정영훈;송상빈;여인선
    • 한국조명전기설비학회:학술대회논문집
    • /
    • 한국조명전기설비학회 1998년도 학술발표회논문집
    • /
    • pp.162-165
    • /
    • 1998
  • A certain degree of energy saving can be possible by controlling the delay time of occupancy sensor. In this paper a control circuit is designed for automatic control of delay time setting appropriate to different situations using a digital counter, two latches and an adder. The delay time is controlled by adjusting the time constant of RC circuit through on-off control of switching devices according to adder output, which determines the base current level of switching devices. And from PSpice simulation it is verified to function properly.

  • PDF

실시간 위치 추적 시스템을 위한 ESPRIT 기반의 초 분해능 지연 시간 추정 알고리즘 (An ESPRIT-Based Super-Resolution Time Delay Estimation Algorithm for Real-Time Locating Systems)

  • 신준호;박형래;장은영
    • 한국통신학회논문지
    • /
    • 제38A권4호
    • /
    • pp.310-317
    • /
    • 2013
  • 본 논문에서는 실시간 위치 추적 시스템 (RTLS: real-time locating system)을 위한 ESPRIT 기반의 초 분해능 지연 시간 추정 (super-resolution time delay estimation) 알고리즘을 개발하고 여러 가지 다중 경로 환경에서 성능을 분석한다. 지연 시간 추정을 위한 기존의 코릴레이션 방식은 다중 경로들의 지연 시간의 차이가 한 칩 이내일 경우 성능이 급격히 저하되는 문제점이 있다. 이러한 문제를 해결하기 위해 대표적인 초 분해능 도래각 추정 알고리즘인 ESPRIT을 지연 시간 추정에 적용하여 주파수 영역 초 분해능 지연 시간 추정 알고리즘을 개발하고 여러 가지 다중 경로 환경에서 알고리즘의 성능을 분석한다.

시간 지연이 존재하는 시스템에 대한 제어기의 매개변수에 관한 해석 (Analysis on the parameters of the controllers for time-delay systems)

  • 박영일;이석원;정영창
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
    • /
    • pp.65-68
    • /
    • 1997
  • 溜is paper is concerned with the controllers for time-delay systems which has an integrator. It is known that high performance can be obtained for the systems response and load disturbance rejection by adjusting the only three parameters of the modified Smith predictor. In the case of the time-delay systems with repeated poles, good performance cannot be obtained with the modified Smith predictor. But superior performance can be obtained through the intentional delay parameters mismatch. The calculating method for the approximation delay parameter values is proposed. Simulation results show the improved response characteristics with the proposed delay parameter values.

  • PDF

전달정렬의 측정치 시간지연 오차보상 기법 (Measurement Time-Delay Error Compensation for Transfer Alignment)

  • 임유철;송기원;유준
    • 제어로봇시스템학회논문지
    • /
    • 제7권11호
    • /
    • pp.953-957
    • /
    • 2001
  • This paper is concerned with a transfer alignment method for the SDINS under ship motions. Major error sources of transfer alignment are data transfer time-delay, lever-arm velocity and ship body flexure. Specifically, to reduce alignment errors induced by measurement time-delay effects, the error compensation method through delay state augmentation is suggested. A linearized error model for the velocity and attitude matching transfer alignment system is first derived by linearizing the nonliner measurement equation with respect to its time delay and augmenting the delay state into the conventional linear state equations. And then it is shown via observability analysis and computer simulations that the delay state can be estimated and compensated during ship motions resulting in considerably less alignment errors.

  • PDF

시변지연을 가지는 TS퍼지시스템을 위한 견실 시간종속 안정성판별법 (Robust Delay-dependent Stability Criteria for Takagi-Sugeno Fuzzy Systems with Time-varying Delay)

  • 유아연;이상문;권오민
    • 전기학회논문지
    • /
    • 제64권6호
    • /
    • pp.891-899
    • /
    • 2015
  • This paper presents the robust stability condition of uncertain Takagi-Sugeno(T-S) fuzzy systems with time-varying delay. New augmented Lyapunov-Krasovskii function is constructed to ensure that the system with time-varying delay is globally asymptotically stable. Also, less conservative delay-dependent stability criteria are obtained by employing some integral inequality, reciprocally convex approach and new delay-partitioning method. Finally, two numerical examples are provided to demonstrate the effectiveness of the proposed method.

Global Finite-Time Convergence of TCP Vegas without Feedback Information Delay

  • Choi, Joon-Young;Koo Kyung-Mo;Lee, Jin S.;Low Steven H.
    • International Journal of Control, Automation, and Systems
    • /
    • 제5권1호
    • /
    • pp.70-78
    • /
    • 2007
  • We prove that TCP Vegas globally converges to its equilibrium point in finite time assuming no feedback information delay. We analyze a continuous-time TCP Vegas model with discontinuity and high nonlinearity. Using the upper right-hand derivative and applying the comparison lemma, we cope with the discontinuous signum function in the TCP Vegas model; using a change of state variables, we deal with the high nonlinearity. Although we ignore feedback information delay in analyzing the model of TCP Vegas, the simulation results illustrate that TCP Vegas in the presence of feedback information delay shows very similar dynamic trends to TCP Vegas without feedback information delay. Consequently, dynamic properties of TCP Vegas without feedback information delay can be used to estimate those of TCP Vegas in the presence of feedback information delay.

Robustness Analysis Under Second-Order Plant and Delay Uncertainties for Symmetrically Coupled Systems with Time Delay

  • Cheong Joon-O;Kwon Sang-Joo
    • Journal of Mechanical Science and Technology
    • /
    • 제20권8호
    • /
    • pp.1195-1208
    • /
    • 2006
  • This paper aims at presenting robustness analysis under the uncertainties of the time delay and plant parameters in symmetrically coupled dynamic systems connected through network having time delay. The delay-involved closed loop characteristic function is mathematically formulated, incorporated with active synchronization control. And the robust stability of the corresponding system is analyzed by investigating the formation of characteristic equation containing second- order terms of uncertainty variables representing delay and plant dynamics mismatches. For the two individual types of uncertainties, we elucidate details of how to compute the bounds and what they imply physically. To support the validity of the mathematical claims, numerical examples and simulations are presented.

Measurement Time-Delay Error Compensation For Transfer Alignment

  • Lim, You-Chol;Song, Ki-Won;Joon Lyou
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 제어로봇시스템학회 2000년도 제15차 학술회의논문집
    • /
    • pp.486-486
    • /
    • 2000
  • This paper is concerned with a transfer alignment method for the SDINS(StrapDown Inertial Navigation System) under ship motions. Major error sources of transfer alignment are data transfer time-delay, lever-arm velocity and ship body flexure. Specifically, to reduce alignment errors induced by measurement time-delay effects, the error compensation method through delay state augmentation is suggested. A linearized error model for the velocity and attitude matching transfer alignment system is first derived by linearizing the nonlinear measurement equation with respect to its time delay and augmenting the delay state into the conventional linear state equations. And then it is shown via observability analysis and computer simulations that the delay state can be estimated and compensated during ship motions resulting in considerably less alignment errors.

  • PDF

적분형 슬라이딩 서피스를 이용한 TDCSA(Time Delay Control With Switching Action)의 와인드업 방지를 위한 기법의 개발 (The Development of Anti-Windup Scheme for Time Delay Control with Switching Action Using Integral Sliding Surface)

  • 이성욱;장평훈
    • 대한기계학회논문집A
    • /
    • 제26권8호
    • /
    • pp.1534-1544
    • /
    • 2002
  • The TDCSA(Time Delay Control with Switching Action) method, which consists of Time Delay Control(TDC) and a switching action of sliding mode control(SMC), has been proposed as a promising technique in the robust control area, where the plant has unknown dynamics with parameter variations and substantial disturbances are preset. When TDCSA is applied to the plant with saturation nonlinearity, however, the so-called windup phenomena are observed to arise, causing excessive overshoot and instability. The integral element of TDCSA and the saturation element of a plant cause the windup phenomena. There are two integral effects in TDCSA. One is the integral effect occurred by time delay estimation of TDC. Other is the integral term of an integral sliding surface. In order to solve this problem, we have proposed an anti-windup scheme method for TDCSA. The stability of the overall system has been proved for a class of nonlinear system. Experiment results show that the proposed method overcomes the windup problem of the TDCSA.