Effects of Wind Turbines on High Frequency Surface Wave Radar


  1. Riddolls, R.J.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
A study is carried out on the effects of a wind turbine on a potential High Frequency Surface Wave Radar system at Hartlen Point, Nova Scotia. The scope of the study is limited to the model V-47 wind turbine produced by Vestas Wind Systems. The study considers two effects of the turbine on the radar. The first effect is the production of Radio Frequency Interference (RFI) by the turbine. Measurements of an existing wind turbine determine an upper bound on the contribution of the turbine to the local radio noise floor. It is shown that broadband turbine RFI would be at a level below the noise floor at Hartlen Point when the turbine is located at a range of 300 meters from the radar receive array. The second effect is the scattering of radar signals by the rotating turbine blades. Simple calculations are carried out to determine the Radar Cross-Section (RCS) of the blades. This RCS varies with the rotation of the blades. Thus the apparent blade RCS will vary slowly in time such that radar clutter signals will be modulated and spread into regions of the range-Doppler plane that are normally free of clutter. The calculations suggest that the Doppler spreading may be signiffcant if the turbine is less than 1.5 km from the radar.

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Report Number
DRDC-OTTAWA-TM-2005-240 — Technical Memorandum
Date of publication
01 Dec 2005
Number of Pages

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