Scott Gleason

Dr. Scott Gleason, Principal Scientist, Southwest Research Institute.jpg


The Cygnss Nanosatellite Constellation Hurricane Mission

The Cyclone Global Navigation Satellite System (CYGNSS) is a spaceborne mission concept focused on tropical cyclone (TC) inner core process studies. CYGNSS attempts to resolve the principle deficiencies with current TC intensity forecasts, which lies in inadequate observations and modeling of the inner core. CYGNSS consists of 8 GPS bistatic radar receivers deployed on separate nanosatellites. The primary science driver is rapid sampling of ocean surface winds in the inner core of tropical cyclones. The use of a dense constellation of nanosatellite results in spatial and temporal sampling properties which are markedly different from conventional imagers. CYGNSS is intended to provide all-weather performance of GNSS bistatic ocean surface scatterometry with the sampling properties of a constellation of satellites.

This presentation will start with a brief summary of the Earth remote sensing applications possible using the GNSS bistatic radar technique. Next, detailed simulation results will be presented which examine the sampling achieved by the 8 CYGNSS satellites over a simulated hurricane. This will be followed by an overview of the CYGNSS nanosatellite design, with results from the final testing being performed before the mission is scheduled to launch in November 2016l. The low-cost spacecraft GNSS receiver design of the CYGNSS missions will be reviewed in this presentation. Additionally, results from pre-launch simulation studies showing the expected wind retrieval performance will be presented. Finally, potential future GNSS-R missions and applications will be discussed, including an illustration of measurement coverage over land and sea around India using signals from the Indian Regional Navigation Satellite System.