The Giant Metrewave Radio Telescope consists of

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a single parabolic antenna

multiple parabolic antennas

multiple circular antennas

a combination of circular and parabolic antennas

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UPSC CDS-1 – 2024

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The Giant Metrewave Radio Telescope (GMRT) is a major astronomical facility located near Pune, India. It operates at meter wavelengths. The GMRT consists of an array of thirty large parabolic antennas, each 45 meters in diameter, spread over a region of about 25 kilometres. It functions as a single telescope using the technique of aperture synthesis. Therefore, it consists of multiple parabolic antennas.

Radio telescopes typically use parabolic dishes to focus radio waves. The GMRT’s design with multiple antennas allows it to achieve high resolution comparable to a much larger single dish.

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