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- W2556039169 abstract "Satellite tracking stations (STSs) are used in order to track satellite over a specified range of positions. Pedestals are being used as the most important component in each STS. Elevation over azimuth (Az-Elv) pedestals are the most common type of the pedestals, which are used in order to track low elevation orbit (LEO) satellites. However, due to motor speed limit, Az-Elv pedestals are unable to track targets at high elevations near the zenith point. AzimuthElevation-Tilt (Az-El-Ti) can overcome this problem by introducing a third degree of freedom. However, there still remains real challenges in tracking targets under disturbances such as high speed winds. Considering conventional proportional-integral (PI) controllers, the overall system suffers from poor tracking performance under load variations. Moreover, the mechanical characteristics of load such as viscous coefficient and moment of inertia vary gradually. It is a key feature for drive controller to be robust against all these changes. This paper presents a solution for efficient performance of Az-El-Ti pedestals in terms of accurate positioning even during passing the zenith point. The most important advantage of the introduced controller is its non-sensitivity to the variations of load, moment of inertia and viscous coefficient. The controller output will regulate the output position of pedestal's actuators. Permanent magnet synchronous motors (PMSMs) are taken into consideration as the best choice for satisfaction of control objectives. Then a robust sliding mode controller is designed via defining suitable sliding surface and calculating the corresponding control input. While the designed controller is regulating the q-axis current of a PMSM motor, the tracking accuracy is measured via simulating, considering an accurate, nonlinear model of the motor. At last, the controller's performance is validated when it is used in an Az-El-Ti pedestal and the wind is blowing with different speed profiles. The reference azimuth and elevation data are chosen from a real tracking mission and simulation results prove effectiveness of the proposed approach for controlling LEO pedestals." @default.
- W2556039169 created "2016-11-30" @default.
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- W2556039169 date "2016-01-01" @default.
- W2556039169 modified "2023-09-22" @default.
- W2556039169 title "Design of an Robust Controller for Positioning of Azimuth-Elevation-Tilt Pedestals in Low Elevation Orbit Satellite Tracking Missions" @default.
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- W2556039169 hasPublicationYear "2016" @default.
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