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Atmospheric Composition

Fully polarimetric SAR (POLSAR) measurements are subject to the Faraday rotation effect due to suborbital ionospheric total electron content (TEC) along the radar radio path. We propose to extract this new type of data (suborbital TEC) and to maximize its benefit to Earth and space science research. The proposed investigation includes: (1) retrieving suborbital TEC from POLSAR data and using this data to conduct high-resolution ionospheric imaging; (2) comparing the high-resolution ionospheric images with images produced using Global Assimilative Ionospheric Model and Global Ionospheric Maps, which assimilate space-borne and ground-based GPS data, to validate, improve, and quantify the accuracy of both SAR-based and GPS-based techniques; (3) conducting experiments to study the effectiveness of both imaging techniques in mitigating the ionospheric artifacts on L-band and lower-frequency InSAR applications; (4) conducting experiments to demonstrate the benefits of the imaging techniques to capturing ionospheric signatures of solid Earth activities and of space weather conditions. The proposed experiments will utilize data collected from two missions both launched in 2006: (1) PALSAR data collected from JAXA's Advanced Land Observing Satellite (ALOS) mission, and (2) GPS occultation data collected from the joint Taiwan and U.S. mission of Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC). GPS data collected from hundreds of globally distributed permanent stations will also be used as part of data sources for ionospheric imaging. The proposed development and analyses of combined SAR-GPS ionospheric imaging capability will shed light on many outstanding Earth and space science research topics and be used to support future NASA missions such as DESDnyI.

Project PI: Xiaoqing Pi/Jet Propulsion Laboratory

Email: xiaoqing.pi@jpl.nasa.gov

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Started: Aug 09, 2010

Last Activity: Dec 09, 2010

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