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The papers in this special section examine the orbit performance pf the Cyclone Global Navigation Satellite System (CYGNSS), a constellation of eight satellites that were successfully launched on December 15, 2016 into low earth orbit. Each satellite carries a four-channel bistatic radar receiver that measures GPS signals scattered by the earth surface. Global Navigation Satellite System Reflectometry (GNSS-R) techniques are used to retrieve near surface wind speed over ocean and soil moisture over land. The measurements are unique in several respects, most notably in their ability to penetrate through high levels of precipitation, made possible by the low frequency at which GPS operates, and in the frequent revisit time and complete sampling of the diurnal cycle, made possible by the large number of satellites in a low inclination orbit. Engineering commissioning of the constellation was successfully completed in March 2017. Since then, CYGNSS science data products have been continuously produced.

Foreword to the Special Issue on Cyclone Global Navigation Satellite System (CYGNSS) Early on Orbit Performance