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Impact of Off-Shore Wind Turbine on Forward Scattering of Marine Radar Signals
April 23, 2018 @ 5:00 pm - 6:00 pm
Co-sponsored by: Morteza Shahpari
Due to stronger wind speeds available on the sea, the majority of future wind energy projects in the EU, in China, and, most likely, in the U.S. will go offshore. Forward scattering (diffraction) of radar signals at a WT causes time-variant areas of obstacle loss (desensitisation, blockage) and areas of obstacle gain behind the turbine. At the same time, rotating blades induce a time-variant phase modulation of the diffracted signal which will become apparent as an error in the measured Doppler spectrum. Wrong estimation of the radial speed of a vessel by marine radar will impact the performance of automatic collision avoidance systems (ACAS). A proper insight into WT forward scattering can help to mitigate this problem.
The error in measured radial speed due to rotor forward scattering is investigated for S-band radar using Fresnel-Kirchhoff diffraction approach. Based on the insight into Fresnel zone shading a scenario with the high impact of rotor forward scattering on the Doppler error is selected. Deviation of instantaneous Doppler frequency, as well as time-frequency spectrum of the modulation signal within the interval of time on target, is investigated.
Speaker(s): Dr Thomas Fickenscher,
Bldg: Campus Heart N76
Griffith University, Nathan Campus