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Servo System for GMRT Antennas.

Introduction

The Giant Meterwave Radio Telescope, an aperture synsthesis array consisting of 30 fully steerable parabolic dishes of 45 metre diameter each. Motion of these gaint antennas need to be controlled by a precession control system. Pointing of the antennas should be accurate i.e. the radio source, antenna focused and the antenna center should be aligned. The GMRT servo system has designed with three nested control loops to achive the pointing accuracy of (1 or 2) arc minites RMS for wind speed less than 20 km/ph. Because of high weight alt-azimuth mount is most favourable approach for positioning the dish antenna. Here the elevation axis sits on the azimuth drive. The elevation drive moves antenna up and down directions while azimuth drive moves antenna in clockwise & counter-clockwise direction. Hence enabling the antenna to point anywhere in the sky.

  •  Alt-Azimuth mount of Antenna :

Alt-Azimuth mount of Antenna

  • Specifications of GMRT servo systemspec1.jpg
  • Principle of positon control applied to GMRT antenna

cont-loop4.jpg

cont-loop5.jpgcon-block-dia7.jpg

  • Servo control Block Diagram :

con-block-dia7.jpg

con-block-dia7.jpg

  • Servo station computor block diagram :

ssc-block-dai6.jpg

  • Amplifier block diagram

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