Abstract
To improve the stability accuracy of two-axis inertially stabilized platform (ISP) for airborne star tracker application, a stable control method based on active disturbance rejection control (ADRC) is presented to handle the system nonlinearities, parameter uncertainties, and disturbances. A noise reduction method based on a modified disturbance observer (DOB) structure is proposed to suppress sensor noise and improve anti-disturbance capability and rapidity. Moreover, the robust stability of the proposed method is discussed. To illustrate the effectiveness of the proposed method, simulations and laboratory experiments are implemented. Finally, the vehicle tracking star experiments are performed. In addition, the contrast results show that for the two-axis ISP the presented controller has superior performance in anti-jamming ability, rapidity, and isolation.
Highlights
Star tracker is widely used in astronomical navigation systems
active disturbance rejection control (ADRC) is a controller with good adaptability and robustness, which can effectively improve the dynamic performance of the system [21]
This paper proposes a simplified NR-disturbance observer (DOB) (SNR-DOB) to reduce the sensor noise while ensuring that the filtered sensor information retains the disturbance information as much as possible
Summary
Star tracker is widely used in astronomical navigation systems. It is of crucial significance for a star tracker to obtain high-resolution and continuous star images. Robust control can effectively overcome parameter uncertainty and disturbance [12]. ADRC is a controller with good adaptability and robustness, which can effectively improve the dynamic performance of the system [21]. This method needs very little model information, and its parameters are easy to tune. ADRC will be applied to the stability control of ISP to suppress nonlinear friction, install unbalanced torque, parameter uncertainty and external torque disturbance and to improve the response speed to gyroscope and tracking inputs.
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