OWA GloBE: The importance of pre- and post-campaign lidar calibrations

Elliot Simon, Michael Courtney, Nassir Cassamo, Eric Hrywniack, Frederic Delbos, Dominic Champneys, Weisheng Lu, Darshan Sathiyanarayanan, Christopher Rodaway, Neil Adams

Research output: Contribution to conferencePosterResearch


A large-scale offshore deployment of six scanning lidars was carried out as part of the OWA GloBE project, with the aim of observing wind-farm scale blockage effects. Due to the small-expected magnitude of the phenomena, comprehensive checks and controls were performed to minimize the measurement uncertainties. Part of this work included onshore calibrations of the lidars both before and after the offshore campaign.

A line-of-sight (LOS) speed intercalibration was performed on all permutations of lidar pairs using regression analysis to determine the coefficient and relative uncertainty of each pair of lidars. It is ideal to evaluate the performance of a lidar based on this fundamental unit to minimize assumptions and uncertainties introduced into post-processed byproducts. The pre-campaign intercalibration results showed good agreement between systems with a relative LOS speed uncertainty of 0.3% (standard category B).

Following the offshore campaign, the systems were again installed side-by-side and the calibration activities were repeated. This time, two of the six lidars required offset corrections to be applied to the measured speeds. This result has since been independently verified by the lidar manufacturer who discovered hardware issues on both lidars which caused the deviations. We present the results of both calibration activities to demonstrate the clear need for doing so when conducting future work.
Original languageEnglish
Publication date2023
Number of pages1
Publication statusPublished - 2023
EventWindEurope 2023 - Copenhagen, Denmark
Duration: 25 Apr 202327 Apr 2023


ConferenceWindEurope 2023


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