Abstract
This work deals with the analysis and design of a reaction thruster attitude control for the Brazilian Multimission platform satellite. The three‐axis attitude control systems are activated in pulse mode. Consequently, a modulation of the torque command is compelling in order to avoid high nonlinear control action. This work considers the Pulse‐Width Pulse‐Frequency (PWPF) modulator which is composed of a Schmidt trigger, a first‐order filter, and a feedback loop. PWPF modulator holds several advantages over classical bang‐bang controllers such as close to linear operation, high accuracy, and reduced propellant consumption. The Linear Gaussian Quadratic (LQG) technique is used to synthesize the control law during stabilization mode and the modulator is used to modulate the continuous control signal to discrete one. Numerical simulations are used to analyze the performance of the attitude control. The LQG/PWPF approach achieves good stabilization‐mode requirements as disturbances rejection and regulation performance.
Highlights
One of the intentions of this work is to support the ongoing Brazilian multimission platform MMP satellite project 1
The obtained on-off thruster reaction attitude control system based on the LQG/PWPF modulation is optimal with respect to regulation, i.e., minimizing the quadratic cost function of states and control signals, and propellant consumption
The optimality for fuel is obtained through off-line simulations varying the parameters of the PWPF modulator till less fuel consumption is achieved
Summary
One of the intentions of this work is to support the ongoing Brazilian multimission platform MMP satellite project 1. The project takes into consideration a special platform satellite which can supply multimissions capabilities supporting different payloads to lift up on the platform. The MMP adopted pulse or on-off reaction thruster for attitude maneuvers, modulating continuous command signal to an on-off signal is a required task. Selecting the properly method to Mathematical Problems in Engineering modulate the control command signal is a key assignment. The aim of this work is to provide smoother control for improved pointing requirements with less thruster activation or propellant consumption. The fuel is a deciding factor of the lifetime of the spacecraft and reduced propellant consumption is highly required, specially, regarding a multimission spacecraft wherein different payloads are being considered
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