Preprints
https://doi.org/10.5194/amt-2023-117
https://doi.org/10.5194/amt-2023-117
31 Jul 2023
 | 31 Jul 2023
Status: this preprint is currently under review for the journal AMT.

Mispointing correction methods for the conically scanning WIVERN Doppler radar

Filippo Emilio Scarsi, Alessandro Battaglia, Frederic Tridon, Paolo Martire, Ranvir Dhillon, and Anthony Illingworth

Abstract. Global measurements of horizontal winds in cloud and precipitating systems represent a gap in the global observing system. The WIVERN mission, one of the four candidates to be the ESA's Earth Explorer 11 mission, aims at filling this gap based on a conically scanning W-band Doppler radar instrument. The determination of the antenna boresight mispointing angles and the impact of their uncertainty on the line of sight velocities is critical to achieve the mission requirements. While substantial industrial efforts are on their ways for achieving accurate determination of the pointing, alternative (external) calibration approaches are currently under scrutiny. This work discusses four methods applicable to the WIVERN radar that can be used to correct antenna mispointing both in the azimuthal and in the elevation directions at different time scales.

Results show that elevation mispointing is well corrected at very short time scales by monitoring the range at which the surface peak occurs. Azimuthal mispointing is harder but can be tackled by using the expected profiles of the non-moving surface Doppler. Biases in pointing at longer time scales can be monitored by using well established reference database (e.g. ECMWF reanalysis) or ad-hoc ground based calibrators.

Although tailored to the WIVERN mission, the proposed methodologies can be extended to other Doppler concepts featuring conically scanning or slant viewing Doppler systems.

Filippo Emilio Scarsi et al.

Status: open (until 18 Oct 2023)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2023-117', Anonymous Referee #1, 31 Aug 2023 reply
    • AC1: 'Reply on RC1', Filippo Emilio Scarsi, 20 Sep 2023 reply

Filippo Emilio Scarsi et al.

Filippo Emilio Scarsi et al.

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Short summary
The WIVERN mission, one of the four candidates to be the ESA’s Earth Explorer 11 mission, aims at providing measurements of horizontal winds in cloud and precipitating systems through a conically scanning W-band Doppler radar. This work discusses four methods that can be used to correct the antenna mispointing errors of the WIVERN Doppler radar. The proposed methodologies can be extended to other Doppler concepts featuring conically scanning or slant viewing Doppler systems.