@book{3a717950ab5c40578d6c12516ff5ad4c,
title = "The long term stability of lidar calibrations",
abstract = "Wind lidars are now used extensively for wind resource measurements. One of the requirements for the data to be accepted in support of project financing (so-called {\textquoteleft}banka-bility{\textquoteright}) is to demonstrate the long-term stability of lidar cali-brations. Calibration results for six Leosphere WindCube li-dars are used examine this stability. Calibration results be-fore and after periods of field service are examined. No evi-dence of systematic drift is observed but some significant statistical variation is seen. We believe that much of the cal-ibration variation is due to differing environmental parame-ters pertaining in the different calibration periods. This is supported by sliding-window analyses of one lidar at one location where the same order of variation is observed as between pre-service and post-service calibrations.",
keywords = "DTU Wind Energy E-0033, DTU Wind Energy E-33",
author = "Michael Courtney and {Gayle Nygaard}, Nicolai",
note = "The original version of this report (July 2013) has been revised with the addition of pre and post calibration results from a second campaign and some extra analysis concerning the previously reported erratic behaviour of the sensing height error. This second and final version is dated January 2014.",
year = "2014",
language = "English",
series = "DTU Wind Energy E",
number = "0033",
publisher = "DTU Wind Energy",
address = "Denmark",
}