An FPGA-Based Comparative Analysis of Control Techniques for Gimbals and Fins of Missiles

Abstract

In this study, implementation of incremental fuzzy control (IFC) method on field programmable gate array (FPGA) is investigated for gimbals and fins of missiles that include brushless direct current (BLDC) motors and its comparison with conventional proportional-integral (PI) control method are analyzed. BLDC motors are widely used in two important parts of guided missiles due to their high performance. Firstly, gimbals usually consist of seeker cameras, whose axis controls are provided by BLDC motors. These motors provide two axis seeker camera motions, so that the missiles can trace the target. Secondly, missiles can be guided to intended direction by BLDC motors that are used in the control system of fins. According to these important roles, controlling of BLDC motors is very important for defense industry. Therefore, performance of FPGA-based conventional PI and proposed IFC methods on BLDC motors are analyzed in detailed in terms of both simulation and experimental study. Simulation results are obtained by using MATLAB/Simulink program. Also, an FPGA-based test bench is used for experimental studies. Results obtained from simulation and experimental set up are compared and it is proved that the implementation of proposed IFC method improves the BLDC motor performance used in missiles compared to the conventional PI control method.