Abstract Details
| Name: Santaji N Katore Affiliation: NCRA Conference ID: ASI2016_924 Title : Characterising the time-domain band stability of the upgraded GMRT system Authors and Co-Authors : Dharam V. Lal, NCRA Ishwara Chandra, NCRA Abstract Type : Poster Abstract Category : Instrumentation and Techniques Abstract : Giant Metrewave Radio Telescope (GMRT), located near Pune in India, is an array of radio telescopes at metre wavelengths. It is operated by the National Center for Radio Astrophysics, a part of the Tata Institute of Fundamental Research, Mumbai. GMRT is the world's most sensitive radio interferometer and is currently undergoing a very significant upgrade. One of the key objective of this upgrade is to improve sensitivity. There are several upgrades, e.g., in the front-end RF-receivers, digital backend system, etc. In the new frond-end and the digital back-end upgraded systems, we now have 400 MHz RF receivers, and 400 MHz digital backend. Multiple data sets were collected over more than one year duration as part of regular GMRT upgrade tests. Here we have performed a comparative study between the older GMRT software backend and the newer GMRT wide-band backend over this long time baseline. The cross-correlation amplitude and the relative phase, or the gain variations are used as function of time and frequency-channel for these two systems. Here, we present the improvements in the data quality of the upgraded GMRT system as compared with the old system. |