Servosystem of the EISCAT Svalbard antenna

Computer Science – Performance

Scientific paper

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Scientific paper

The antenna of the EISCAT Svalbard Radar is designed for the frequency range 470 - 530 MHz. The servo system has thyristor controlled dc-motors with digital cascade controllers for tachometer and position loops. The motors are rated on the basis of wide load considerations. The motors are connected via gears and are electrically preloaded using a special scheme. Special velocity profiles are used during acceleration. A non-linear model has been used for simulation of servo performance under wind load. A linear model was formulated to study stability conditions. A special active damping algorithm is applied to damp vibrations in drive motors coupled in parallel. Frequency response measurements on the antenna were carried out using the control computer. Good agreement was found between measurements and model results.

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