Higher-order calibration on WindRAD (Wind Radar) scatterometer winds

Li, Zhen; Stoffelen, Ad; Verhoef, Anton; Wang, Zhixiong; Shang, Jian; Yin, Honggang

doi:https://doi.org/10.5194/amt-16-4769-2023

Articles | Volume 16, issue 20

https://doi.org/10.5194/amt-16-4769-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/amt-16-4769-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 16, issue 20

Research article

|

20 Oct 2023

Research article |

| 20 Oct 2023

Higher-order calibration on WindRAD (Wind Radar) scatterometer winds

Zhen Li, Ad Stoffelen, Anton Verhoef, Zhixiong Wang, Jian Shang, and Honggang Yin

Data sets

FY-3E WindRAD CMA http://satellite.nsmc.org.cn/portalsite/default.aspx?currentculture=en-US

Short summary

WindRAD (Wind Radar) is the first dual-frequency rotating fan-beam scatterometer in orbit. We observe non-linearity in the backscatter distribution. Therefore, higher-order calibration (HOC) is proposed, which removes the non-linearities per incidence angle. The combination of HOC and NOCant is discussed. It can remove not only the non-linearity but also the anomalous harmonic azimuth dependencies caused by the antenna rotation; hence the optimal winds can be achieved with this combination.