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WIND TURBINE EFFECT ON DTV STUDIED USING ADIVIC RF TCX EQUIPMENT

2009-04-16 The potential effect of wind turbine mills close to digital terrestrial television transmitters is being analyzed in Spain under the scope of a cooperation project between the Spanish University of the Basque Country (UPV/EHU), the Canadian Communications Research Centre (CRC) and the company ADIVIC www.adivic.com with headquarters in Taiwan. The objective of the project is to study the potential degradation caused by wind turbines in a digital terrestrial television reception quality by describing and quantifying the scattering process of the broadcast signal at the different parts of a wind turbine (blades, pylon and nacelle). The study is being based on a measurement campaign carried out in the north of Spain, where wind mill farms have been very popular in the last few years. A list of measurement locations has been planned in the vicinity of wind mill farms and close to digital terrestrial television transmitters (Spain uses DVB-T as the digital terrestrial television standard). The DVB-T signal quality is being analyzed using the DBA software (Digital Broadcast Analyzer) (www.ehu.es/tsr_radio/) developed by the UPV/EHU to obtain an accurate impulse response. The key element in the measurement methodology is the use of the ADIVIC RF TCX series that provides RF signal real-time signal capture and record functionality. The real-time capture and record function can capture RF signals of various modulation schemes, including the DVB-T modes used in this project. The use of the ADIVIC RF TCX has allowed capturing the scattered DVB-T signal, when performing controlled movements of the wind turbine parts, a task which is itself very time consuming. The ADIVIC RF TCX permits to record easily the received signal without tedious equipment and signal check out and adjustments, which speeds up the measurement times significantly. The signals are later reproduced by the same ADIVIC TCX unit and analyzed at the laboratory. The first results show that the scattered signal from wind turbines with static blades is noticeable and that the variability of the scattered signal from wind turbines with static blades is limited to a narrow margin of 2 dB, while the variability of the scattered signal increases considerably when the blades start rotating. The preliminary processing of data has shown that wind turbines with rotating blades cause higher variations in the scattered signal level (5-10 dB) that the case of static blades. Furthermore, fast fading occurrences higher than 15 dB are observed. The results of this work will be partially presented at the IEEE Broadband Multimedia Systems and Broadcasting, where the capabilities of the ADIVIC RF TCX equipment will be demonstrated. A report to be delivered to the ITU-R workgroups with information regarding Rec. BT.805 is also on progress.