Description
Giant Meterwave Radio Telescope (GMRT) is an array telescope of 30 antennas each of 45 meter in diameter located at Khodad, Pune. The upgraded GMRT have a seamless coverage over the frequency band ( 120 MHz – 1450 MHz ) with high dynamic radio receivers. The Radio frequency interference to a radio telescope is a permanent threat and needs continuous monitoring and mitigation to protect the operation of radio telescope. Intentional transmissions like mobile communication, TV transmission, wireless service, Air traffic control signals, FM radio stations, satellite services and un-intentional radio interference from power lines, CATV, Industries, Wind power generating stations, computers, computer network components, UPS, SMPS, AC units, Lights etc. are the common sources of radio interference to a Radio Telescope. This paper presents RFI monitoring, characterization of various types of RFI, RFI shielding solutions and various other mitigation techniques adopted at upgraded GMRT for the control of radio frequency interference and maintain a RFI free ambience.
References:
1. Swarup, G. et al., The Giant Metrewave Radio Telescope. Curr. Sci., 1991, 60, 95–105. 2.
2. Yashwant Gupta, et al., The upgraded GMRT: Opening new windows on the radio Universe. Curr. Sci., 113(4):707-714 · January 2017.
3. Pravin Ashok Raybole and S.Sureshkumar, “ External sources of RFI at the GMRT: Methods for control and coexistence with commercial users” in Proceedings of Science 2010,
4. Pravin Ashok Raybole, S.Sureshkumar, SantajiKatore and SanjeetRai,“Real time prediction, detection and co-existing with satellite interference at GMRT” RFI2016, Socorro, New Mexico.
5. S.Sureshkumar, Pravin Ashok Raybole, Sanjeet Rai and Ankur,” RFI characterisation and mitigation at upgraded” IEEE Xplore
