Wind turbine fan radar echo signal Doppler spectrum solving method

Abstract

The invention discloses a wind turbine fan radar echo signal Doppler spectrum solving method. The wind turbine fan radar echo signal Doppler spectrum solving method comprises the following steps: first, determining a rotating angle interval for calculating a blade static RCS by utilizing the 'Nyquist sampling theorem' according to the derived equivalence relation between blade dynamic radar cross section fluctuation frequency and blade radar echo signal Doppler frequency; then, respectively calculating the RCS of a wind turbine blade at various sampling angles by utilizing a mixed algorithm consisting of a physical optics method and an equivalent electromagnetic current method, so that a blade dynamic RCS is obtained based on a 'quasi-static method'; finally, performing discrete short time Fourier transform on the obtained blade dynamic RCS, and solving to obtain the Doppler spectrum of the blade dynamic RCS, namely, the Doppler spectrum of the blade radar echo signal. According to the wind turbine fan radar echo signal Doppler spectrum solving method, a new method and a new way can be provided for effectively identifying a wind turbine target by a radar station, and theoretical basis can also be provided for the aspects, such as electromagnetic scattering reduction of a wind power plant, and wind power plant clutter extraction and inhabitation of the radar station.

Description

technical field [0001] The invention relates to a method for solving the Doppler spectrum of radar echo signals of wind turbine blades, and belongs to the field of electromagnetic compatibility between wind farms and radar systems. Background technique [0002] With the increasing number of wind farms, wind turbines will inevitably produce more and more prominent electromagnetic interference problems to surrounding radar stations. At present, there are various methods for radar stations to suppress the radar echo interference of wind turbines, but the basic principles are similar, that is, to carry out the symbolic Doppler effect of wind turbine blades from the radar echo signal carrying the actual electromagnetic scattering characteristics of wind turbines. Target recognition, so that the method of radar transformation, upgrading or signal processing is used to filter out the wind turbine clutter component in the echo to reduce interference. For the echoes of the wind turb...

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Problems solved by technology

However, it should be pointed out that the production of wind turbine scale models cannot completely solve the influence caused by changes in electrical parameters such as conductivity and dielectric constant during frequency scaling, resulting in measurement errors; at the same time, the cost of scale model experiments is relatively low High, the development cycle is long, the parameters are not convenient to modify, and the repeatability of the experiment is poor

The simulation calculation of the wind turbine echo is based on the point scattering model of the wind turbine blade, that is, the blade is regarded as the superposition of a series of scattering points, the radar echo simulation model of the blade is established, and the Doppler characteristics of the blade are analyzed, but this The model is obviously too rough, and is currently only used for qualitative analysis of the Doppler characteristics of radar echoes of wind turbine blades

Moreover, there is currently no relevant patent related to the method for solving the Doppler spectrum of the wind turbine blade radar echo signal

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