Sentinel-1A (S1A), launched by the European Space
Agency (ESA) on April 3, 2014, is a state-of-the-art
spaceborne Synthetic Aperture Radar (SAR) Earth
observation platform. S1A products are expected to provide
high and consistent geolocation accuracy. As of the end of
May, 2014, the satellite has not yet reached its reference
orbit. However, estimation of product geolocation accuracy
is ongoing, and improvements are continually being made.
The results reported here represent the early situation, with
continued progress expected.
Index Terms— Sentinel-1A, geolocation accuracy,
SAR calibration/validation