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. In this paper, we describe measurement results of thesignal-in-space of very high frequency (VHF) omnidirectional range (VOR)facilities. In aviation VOR are used to display the current course of theaircraft in the cockpit. To understand the influence of wind turbines (WT)on the signal integrity of terrestrial navigation and radar signals, thesignal content and its changes, respectively, must be investigated. So far,only numerical simulations have been carried out on the frequency-modulation(FM) part of the Doppler-VOR (DVOR) signal to estimate the influence of WTon DVOR. Up to now, the amplitude-modulated (AM) part of the DVOR was notassessed at all. In 2016, we presented an unmanned aerial system (UAS) as acarrier for state-of-the-art radio-frequency (RF) measurementinstrumentation (Schrader et al., 2016a, c; Bredemeyer et al., 2016), to measure and to record the true signal-in-space(both FM and AM signal) during the flight. The signal-in-space (which refersto time-resolved signal content and field strength, respectively) ismeasured and sampled without loss of information and, furthermore,synchronously stored with time stamp and with precise position in space,where the measurements were taken.

High-resolution signal-in-space measurements of VHF omnidirectional ranges using UAS