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ECE Distinguished Colloquium Series (ECE 500): "Early On-Orbit Results for the NASA Cyclone Global Navigation Satellite System"

Originating Calendar ECE ILLINOIS Distinguished Colloquium Series
Speaker Professor Chris Ruf, University of Michigan
Date: 10/26/2017
Time: 4 p.m.

Grainger Auditorium, Room 1002 ECE Building

Event Contact:

Professor Raluca Ilie



Event Type: Seminar/Symposium

The CYGNSS constellation of eight satellites was successfully launched on 15 December 2016 into a low inclination (tropical) Earth orbit. Each satellite carries a four-channel bistatic radar receiver that measures GPS signals scattered by the ocean, from which ocean surface roughness, near surface wind speed, and air-sea latent heat flux are estimated. The measurements are unique in several respects, most notably in their ability to penetrate through all levels of precipitation, made possible by the low frequency at which GPS operates, and in the frequent sampling of tropical cyclone intensification and of the diurnal cycle of winds, made possible by the large number of satellites. Engineering commissioning of the constellation was successfully completed in March 2017 and the mission is currently in the early phase of science operations.

Level 2 science data products have been developed for near surface (10 m referenced) ocean wind speed, ocean surface roughness (mean square slope) and latent heat flux. Level 3 gridded versions of the L2 products have also been developed. A set of Level 4 products have also been developed specifically for direct tropical cyclone overpasses. These include the storm intensity (peak sustained winds) and size (radius of maximum winds), its extent (34, 50 and 64 knot wind radii), and its integrated kinetic energy. Assimilation of CYGNSS L2 wind speed data into the HWRF hurricane weather prediction model has also been developed.

An overview and the current status of the mission will be presented, together with highlights of early on-orbit performance and scientific results, especially those related to the 2017 Atlantic hurricane season.

Chris Ruf is a professor of atmospheric science and electrical engineering at the University of Michigan. He has worked previously at Intel Corporation, Hughes Space and Communication, the NASA Jet Propulsion Laboratory, and Penn State University. His research interests involve Earth science remote sensing, with an emphasis on GNSS-R, microwave radiometry, atmosphere and ocean geophysical retrieval algorithms, and sensor technology development. Dr. Ruf is a Fellow of the IEEE and is former Editor-in-Chief of the IEEE Transactions on Geoscience and Remote Sensing. He has served on numerous national and international steering and advisories committees to NASA, ESA and industry and was a panel member of the 2007 and 2017 National Academy of Sciences Earth Science Decadal Survey. He is currently Principal Investigator of the NASA Cyclone Global Navigation Satellite System Earth Venture mission.

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