Remote Sensing and Wave Propagation  
I work in Space and Atmospheric Science domain. Below are brief description of the main themes of my research group: 
i) Precipitation characterization 
The tropical rain has very distinct features. Drop size distribution (DSD) is the fundamental parameter to characterize rain. DSD can vary depending on rain rate and rain type which, in turn, depends on the cloud structure, aerosol and topography. Experimental observation of tropical rain is a key criterion to understand the underlying physics. Ground based instruments such as Micro rain radar, Microwave radiometer, Optical rain gauge and Disdrometer complements the satellite observations to study the rain structure. These studies are carried with collaboration with ISRO and Indian Institute of Tropical Meteorology. 
ii) Extreme weather events
Extreme weathers will be more frequent due to climate change. We use machine learning algorithm to understand the imapact of climate change on Indian precipitation pattern. We also works on developing novel technique for extreme weather forcasting/nowcasting using satellite and ground-based systems.  
iii) SATCOM: Atmospheric effect on microwave/millimeter wave propagation  
Microwave and millimeter wave strongly interact with different atmospheric parameters and is a key consideration for remote sensing and communication applications. Since several Indian satellites (GSAT-4, GSAT-14, Ka –band altimeter in SARAL-Altika etc.) are utilizing Ka band, the study on this topic is very pertinent to national priorities. Data from ground based instruments from different locations and satellite observations are used to study the rain attenuation characteristics as well fade mitigation techniques over Indian region.
iv) Space weather and navigation 
The study of ionospheric effect on navigational system is essential in regions like India with severe ionospheric activity and also very relevant to national priorities of making Indian GPS like systems, GAGAN and IRNSS. Understanding and modelling of ionosphere and space weather events are the major focus of the study. Prediction of solar wind and activity as well space weather events using Deep Learning and other softcomputing based techiques are one of the major thrust in this area.

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Externally Sponsored Projects 
As PI: 
1. ISRO sponsored project "retrieval of atmospheric water vapor from IRNSS/GAGAN data and prediction of extreme weather events based on machine learning techniques" of duration 3 years. Total budget Rs. 43,92,320/-. (Ongoing) 
2. DST-INSPIRE sponsored project "Integrated studies of cloud-aerosol-precipitation system in the Indian region in a climate change scenario" of duration 5 years. Total budget 35 Lacs. (Ongoing) 
3. TEQIP Phase II sponsored project “Rain attenuation studies in relation to satellite communication” of duration one year. Total budget Rs. 1 Lacs. (Completed) 
As Co-PI: 
1. SPL-ISRO sponsored Research Project entitled "Studies on Aerosol Environment at Kolkata Located Near the Land-Ocean Boundary as a part of ARFI Network under ISRO- GBP” of duration three year. Total budget Rs. 24.08 Lacs. (Completed) 
2. ISRO sponsored project entitled “Integrated Studies on Water Vapour, Liquid Water Content and Rain of the Tropical Atmosphere and Their Effects on Radio Environment” under the third phase of the S.K. Mitra Center for Research in Space Environment of duration three year. Total budget Rs. 14.3 Lacs. (Completed) 
3. ISRO/RESPOND sponsored Research Project entitled “Ku/Ka band channel modeling for SATCOM links over Indian Region” of duration two years. Total budget Rs. 11.62 Lakhs. (Completed)