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Prof. C R Subrahmanya

Prof Chelur Ramachandra Subrahmanya (24th November 1948), a Radio Astronomer retired from RRI as Professor in 2010. He is presently an Emeritus Professor at the Raman Research Institute.

Early Years and Education

Prof Subrahmanya was born on 24th November 1948 at Davanagere, Karnataka to Sri. C Ramachandra Sastry and Smt. Sathyavathamma. He obtained BSc Hons in 1968 and MSc in 1970 from Bangalore University. He obtained PhD in 1978 from University of Bombay.


Prof Subrahmanya started his career as Visiting member at TIFR Bombay during 1970-77. He was Research Associate during 1977-79, Fellow 79-87 and became reader in 1987. He became Associate professor in 1992 at TIFR. He became Professor in 1998. He also visited Groningen University, Netherlands as Scientific Officer in 1978 and was Research Fellow during 1983-86 at University of Sydney, Australia. He was visiting scientist at CDAC during 1996-97. He visited Raman Research Institute as Visiting Professor during August 1998 – May 1999. He moved to Raman Research Institute as professor in 1999. He retired from RRI in 2010. Presently he is associated with RRI as Emeritus Professor.

Scientific Work

Prof Subrahmanya proposed a new method of deconvolution and applied it for lunar occultations observed with the radio telescope. He was one of the first to recognize that the success of later techniques like the maximum entropy method was largely due to the use of a priori information to constrain the solution, which was done more directly in his optimum deconvolution method. He proposed a new method which seems to provide a breakthrough for imaging at low frequencies. It provides a convenient way of decoupling the ionospheric phases from other parameters in the equation, such that it can exploit the strong overlap of beams of antennae in a practical synthesis telescope. Prof Subrahmanya explored the possibility of using optical identification statistics at various flux densities for cosmological investigations. At Sydney his interests turned towards extensive observations with the MOST. The most notable is the observation of the complete sample of sources between the declinations -30 and -20 degrees. Another major survey under taken with MOST is the deep survey in 20 independent fields in the southern sky. He has been playing a major role in the GMRT project through expertise interferometry, software and ability to plan and guide a digital engineering project. He had a leading role to play in the parallel processing project control/monitor, software and correlator activities of GMRT. He is also an expert in astronomical software, both the online software related to observing with telescopes and the offline software related to various image processing and other applications. He has contributed substantially towards the software related to the Ooty radio telescope, OSRT, MOST and for the GMRT. Prof Subrahmanya applied radio interferometric techniques to problems related to precise estimation of orbits of geosynchronous satellites likely to be useful for the Indian navigation programme. Currently he is involved in a project for monitoring Ooty Radio Telescope by configuring it as 264 element array equipped with an indigenously developed programmable digital receiver.


Prof Subrahmanya was elected in 1993 as the Fellow of the Indian Academy of science.


He is a member of the International Astronomical Union, Astronomical Society of India, and Indian Association for Research in Computer Science.


Listening to Music is the hobby of Prof. Subrahmanya.

Born 24th November 1948
Calcutta, India
Field: Radio Astronomy
Institutions TIFR, Bombay
Raman Research Institute (1984-2003)
Alma mater Bangalore University
Researcher ID

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