Abstract
Abstract. Radio navigation aids, like the Doppler Very High Frequency Omnidirectional Radio Range (DVOR), provide their navigation service by specific radiation of electromagnetic waves depending on the direction in space and according to their specific antenna characteristics. Therefore, these navigation aids are reliant on undisturbed wave propagation in their operation range. Certainly, a propagation disturbance can be implicated by the presence of scattering objects like large buildings or wind turbines (WT) in the surrounding area of the DVOR, which potentially leads to deviations of the transmitted navigation content. In order to comply with the specified flight safety limits, especially respecting WTs, there is a necessity to predict the prospective bearing error due to installations not only of individual WTs but also of additional ones in a present wind farm or repowering projects. Accordingly, this paper is aimed at ascertaining the bearing deviations' dependency on the quantity of WTs in a realistic wind farm close to a DVOR, calculated in space areas of practical relevance.
Highlights
The potential of scattering objects disturbing the Doppler Very High Frequency Omnidirectional Radio Range (DVOR) is well known and was addressed in several investigations (Hirasawa, 1984; Morlaas et et al, 2008; Fernandes et al, 2014)
The tendency can be recognised that the bearing errors a getting smaller with rising distance between the wind turbines (WT) and the DVOR as well as they in general are slightly smaller on AS2 than on the AS1, which is closer to the DVOR
As a conclusion it must be clearly stated that the linear addition of bearing error contributions is not suitable for use as a worst case estimation, for it exorbitantly exaggerates the actual values
Summary
The potential of scattering objects disturbing the DVOR is well known and was addressed in several investigations (Hirasawa, 1984; Morlaas et et al, 2008; Fernandes et al, 2014). In order to contribute to a technical expertise, in this work a WF is regarded which is located straight in a restriction zone, while the bearing error is calculated both in the beginning as well as in the end of the DVOR’s operation distance. In this way, besides the practical relevance of the investigation results the scientific question for superposition of bearing errors is considered.
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