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:: Volume 3, Number 1 (9-2015) ::
Back to browse issues page JNSEE 2015, 3(1): 122-137
Nonlinear and Robust Guidance Law Design Considering Approximation of Control Loop Dynamics
Mr Vahid Behnamgol1 , Dr Ahmadreza vali *
1- Tehran, Lavizan
Assistant Preofessor Malek Ashtar University of Technology, Tehran, Lavizan , ar.vali@aut.ac.ir
Abstract:   (2338 Views)
In this paper, the guidance law designing problem in the presence of the control loop dynamics using sliding mode control has been studied. For this purpose in the design process, stable control loop dynamic considered that usually not considered by the designers. In practice there is a lag for control loop that may lead to instability in the guidance loop. In this paper the control loop dynamic that is stabilized with an autopilot, approximated as first order lag and then is considered with kinematic equation of motion in designing procedure. To solve the problem because of the nonlinearity in equations and target maneuvers as uncertainty, the sliding mode control scheme is used. So just having the bounds of the uncertainty we can design guidance law and the measure or estimate of uncertainty is not required. The sliding variable is defined with respect to parallel navigation idea using relative lateral velocity between the interceptor and the target. Then a controller is designed for reaching the sliding variable to sliding surface. Therefore the line of sight rate will be zero and collision is inevitable. Also for removing chattering, the continues approximation method is used.
Keywords: Guidance, Control Loop Dynamics, Sliding Mode Control.
Full-Text [PDF 419 kb]   (794 Downloads)    
Type of Study: Research | Subject: Nonlinear Control
Received: 2014/04/20 | Accepted: 2015/04/20 | Published: 2015/10/10
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Behnamgol V, vali A. Nonlinear and Robust Guidance Law Design Considering Approximation of Control Loop Dynamics. JNSEE. 2015; 3 (1) :122-137
URL: http://jnsee.sut.ac.ir/article-1-99-en.html
Back to browse issues page Volume 3, Number 1 (9-2015)
سامانه های غیرخطی در مهندسی برق Journal of Nonlinear Systems in Electrical Engineering
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