Abstract Details
| Name: Pramod Tanaji Padwal Affiliation: NCRA-TIFR Conference ID: ASI2018_1733 Title : uGMRT wideband phasing with automated RFI rejection techniques for pulsar observations. Authors and Co-Authors : Santaji N. Katore (NCRA), B.C. Joshi (NCRA)and Yashwant Gupta (NCRA) Abstract Type : Poster Abstract Category : Instrumentation and Techniques Abstract : Giant Metrewave Radio Telescope is the world's most sensitive low-frequency radio interferometer and presently, it is undergoing a major upgrade, which would complete before the end of year 2017. One of the key objectives of this upgrade is to improve sensitivity along with obtaining near seamless frequency coverage from 125 MHz to 1450 MHz. This capability is particularly useful for sensitive pulsar observations, where the interferometer is used as a 150-m single dish telescope by phasing the compact array antennas. Unlike legacy GMRT, the wideband phasing faces the challenge of narrowband RFI scattered across the band. This reduces the speed of phasing and sometimes, renders phasing impossible. We are developing a procedure for automatic RFI rejection before computation of instrumental phase for the wideband data for this upgraded system. Here, we present our first results from this ongoing developmental efforts. In particular we outline the steps and discuss the algorithm used to identify RFI affected channels. We illustrate our procedure with several test cases, including use of strong and weak phase calibrator sources for typical pulsar observations. |