Predicting DVOR Bearing Errors Caused by Wind Turbines - A New Tool

Thorsten Schrader (1)

1 PTB - Physikalisch-Technische Bundesanstalt [Braunschweig]

The impact of scattering objects such as wind turbines (WTs) and other buildings on the VOR has been addressed in various publications. Nevertheless, a practically feasible possibility to predict especially the Doppler VOR bearing error during the building’s planning phase is challenging, since a electromagnetic model of that facility must replicate its radiation with both CSB and SBO antennas in a complex scenario that is large w.r.t. the wavelength. A new time domain method will be introduced to address this topic for dynamically disturbed environments. Separating its frequency modulated (FM) and amplitude modulated (AM) content, the indicated bearing is calculated subsequently by determining the corresponding phase difference. Within the research project WERAN, an UAS-based (here: octocopter) platform with dedicated antennas, receivers and adapted signal processing was developed. Using this device, it is now possible to measure separately small phase errors on the 30Hz FM and AM signal components. According to the prediction, bearing errors due to existing wind farms are now traceable at specific positions in the airspace. Hence, the numerical results can be validated by in situ measurements of real DVOR signals-in-space in the environment of real WTs. The presentation will give an overview on the numerical method and the validation cases.

Domaines: Electromagnétisme

Thorsten Schrader. Predicting DVOR Bearing Errors Caused by Wind Turbines - A New Tool. Specialist Meeting on Electromagnetic Waves and Wind Turbines (EMWT2019), Dec 2019, toulouse, France. ⟨hal-02475761⟩