Title:	Scalable Digital Receiver for Multi-Element Radio Telescopes
Authors:	Subrahmanya, C.R. Sarun, O. S. Abhyankar, Y. +2 Co-Authors
Keywords:	Digital receiver correlator digital beam former phased array feed FPGA
Issue Date:	Oct-2020
Publisher:	World Scientific Publishing Company
Citation:	Journal of Astronomical Instrumentation, 2020, Vol.9, p2050016
Abstract:	Modern and upcoming radio telescopes at low frequencies are often characterized by hundreds or thousands of antenna elements operating at wide bandwidths up to about 0.5GHz. A spectral correlator for such an array is required to estimate the cross-power spectrum of the response of each element with that of every other element with a high spectral resolution. The resulting all-to-all connectivity between signals from the entire array poses a serious bottleneck. In this paper, we propose a simple digital receiver architecture that interfaces the digitized time series from a large number of antenna elements to a High-Performance Computing (HPC) cluster through a communication switch to overcome the data ingest bottleneck. Each HPC node can then perform wideband processing in steps of finite but significant time-slices for the entire array. We explain in detail the implementation of our architecture for the proposed expansion of the Ooty Wide Field Array (OWFA) into a 1056 element array. Since the proposed digital receiver is based on Field Programmable Gate Array (FPGA), it can be reconfigured for different applications. This is illustrated by considering the case of Phased Array Feeds (PAF) for the proposed expanded Giant Metrewave Radio Telescope (eGMRT).
Description:	Restricted Access
URI:	http://hdl.handle.net/2289/7554
ISSN:	2251-1717 2251-1725(Online)
Alternative Location:	https://doi.org/10.1142/S2251171720500166
Copyright:	2020 World Scientific Publishing Company
Appears in Collections:	Research Papers (A&A)

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