REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

ADAPTIVE TIME VARYING AUTOPILOT DESIGN

NATAŠA VLAHOVIĆ

PhD studies: School of Electrical Engineering, University of Belgrade,

Work place: Military Technical Institute, Belgrade, natasha.kljajic@yahoo.com

STEVICA GRAOVAC

School of Electrical Engineering, University of Belgrade, Belgrade, graovac@etf.bg.ac.rs

MILOš PAVIĆ

Military Technical Institute, Belgrade, cnn@beotel.rs

MILAN IGNJATOVIĆ

Military Technical Institute, Belgrade, milan.ignjatovic@hotmail.rs

Abstract: Missile autopilots represent devices for precise following of a target that missiles are sent to intercept. Commands that need to be executed are forwarded to the autopilot in order to achieve demanded performance. Usually, in representation of an autopilot and its performance, a model with constant parameters is used. Constant autopilot parameters and missile coefficients are calculated from time varying values. Model with constant parameters is shown in this paper, as well as the results obtained from this model. These values are then used as the initial ones for calculations in time varying pitch autopilot model design based on gain-scheduling. It is shown how the coupling with other axis such as yaw is cancelled by using time varying parameters. All the models are implemented in Matlab and Simulink toolbox.

Keywords: Autopilot design, Time varying coefficients, Matlab, Simulink, cross - coupling cancellation, gain-scheduling design.