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Fig. 1: (a) The Two Shell Ionospheric model and (b) performance of new Klobuchar-like modelGNSS signals are also useful for remote sensing of Earth’s environment. As the number of signals are increasing with addition of new satellite constellations and new frequencies, a new opportunity emerges to study both lower atmospheric as well ionospheric phenomena. Our research is specially focusing on monitoring tropospheric variables such as atmospheric water vapour by using the signal from Global Navigation Satellite System(GNSS) network as well as our newly launched Indian Regional Navigation Satellite System, NavIC. The near real time accurate estimation of atmospheric water vapour is very much helpful to predict the extreme weather events. Figure 2 shows the TEC variation observed by our algorithm as well the water vapor.
Figure 2: (a) The TEC variation over Kolkata and (2) performance of PWV retrieval from GPS data using our model
Figure 3: Detection of thunderstorm using NavIC satellite with Dynamic Time Warping TechniqueThe impact of highly energetic lower atmospheric disturbances such as cyclones, thunderstorm generated very high intensity lightning strikes has been seen in the upper atmosphere by the interaction of generated very low frequency signals with the layers of ionosphere. The continuous monitoring of ionospheric total electron content retrieved from GNSS signal is very helpful for detection of such low frequency signals and hence the characterization of such lower atmospheric disturbances.
Figure 4: Detected low frequency signals by navigation satellites after severe lightning strikes.We welcome researchers interested in GNSS, Satellite communication and navigation, remote sensing and ionospheric physics to join us for collaboration and as PhD / Post-docs in this group.