Calibration of the Spaceborne GNSS-R Specular Delay Tracking on Fengyun-3 Missions and Its Impact on Ocean Wind Retrieval (opens in new tab)

Calibration is one of the foundations of spaceborne Global Navigation Satellite System Reflectometry (GNSS-R) geophysical parameter retrievals. This article highlights that, besides power calibration, accurate time delay calibration is also crucial to GNSS-R ocean wind retrievals as the computation of normalized bistatic radar cross section (NBRCS) requires the location of the specular point (SP) in the delay–Doppler map (DDM). First, the specular delay tracking algorithm of Fengyun-3 (FY-3) ...