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ABSTRACT
This paper aims at developing an algorithm that uses polarimetric weather radar variables and its spatial variations to characterize and remove ground clutter (GC) and anomalous propagation (AP) echoes. A fuzzy logic based approach has been followed, which uses the standard deviation of differential phase (SDΦDP), vertical gradient of reflectivity (VGZ), dual pol texture ratio (DPTR) and correlation coefficient (ρhv) to discriminate precipitation echoes and non-precipitating echoes. The algorithm is tested for data of different independent events. The meteorological conditions leading to AP are also discussed. The accuracy obtained from the new algorithm is found to be better than the filtering techniques used so far.
Acknowledgements
The authors would like to acknowledge Director, ISRO Telemetry, Tracking & Command Network (ISTRAC) for providing necessary facilities to carry out this work. The authors are thankful to all RDA engineers for their support. The authors are also thankful to ECMWF and MOSDAC/SAC for providing ERA5 data and INSAT 3D IMAGER data, respectively.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Data availability statement
The data used in the analysis will be shared as and when a request comes from the agency. We do not have data sharing server for the DWR system.
Additional information
Notes on contributors
Saranya Sasidharan
Saranya Sasidharan received B.Sc in Physics from Assumption College, Changanacherry and M.Sc in Physics from the Dept. of Theoretical Physics, University of Madras, Chennai. She joined as a Research fellow in ISTRAC-ISRO in 2018. She is currently pursuing PhD in the department of Physics, Indian Institute of Space Science and Technology (IIST), Thiruvananthapuram. Her main research interest is in the field of Radar Meteorology especially on the applications of Polarimetric Doppler weather radar.
V. K. Anandan
Dr. V. K. Anandan received his M.Sc. and M.Tech degree from Cochin University of Science and Technology, Cochin and PhD in Electronics & Communication Engineering and Physics from Sri Venkateswara University, Tirupati, India. He has done his post-doctoral research at National Central University, Taiwan. Joined Indian Space Research Organisation (ISRO) in 1991 and presently working as Deputy Director of Radar Development Area (RDA), ISTRAC/ISRO. Involved in system design and development of Phased array atmospheric radars and Polarimetric Doppler Weather radar systems, Tracking radars, sodars, multi-channel receiver developments and post beam steering techniques employed to radar systems. His area of interest includes Phased array radar system developments, multiple satellite tracking and commanding system, signal processing algorithm developments, scientific studies related to remote sensing of the atmosphere and weather using different observational systems.
Shivangi Mishra
Dr. Shivangi Mishra is working in Radar Development Area of ISTRAC/ISRO since 2010. She has obtained her B.Sc and M.Sc (Physics) degrees from Banaras Hindu University (B.H.U), Varanasi, U.P in the year 2005 and 2007 respectively. She was awarded Doctoral degree in the year 2011 from the same university for her thesis on “Linear & Surface Enhanced Raman Spectroscopy of some important polar molecules”. Her research interest includes Weather radar data products and its validation using various other sensors, quantitative precipitation estimation (QPE) and Raman spectroscopy.
Sourin Mukhopadhyay
Dr. Sourin Mukhopadhyay received his B.Sc. and M.Sc. in Physics from Visva-Bharati University, Santiniketan, India in 2002. He was awarded Ph.D. in Physics from Tata Institute of Fundamental Research, Mumbai, India in 2008. After Ph.D., he joined at Cornell University, NY, USA as a Post-Doctoral Fellow (2008–2013) and he was instrumental in designing world’s first Spectroscopic Imaging STM (SI-STM) with 20T superconducting magnet. He is currently an Assistant Professor with the Department of Physics, Indian Institute of Space Science and Technology, Thiruvananthapuram, India. His main research interests evolve around the study of electron-quasiparticle dynamics on the Fermi surface in exotic quantum materials like high temperature superconductors, topological insulators etc., development and study of spintronics materials, superconductor based electromagnetic and magnetic field sensors with quantum limited sensitivity.