Radar echo solving method of wind motor in terrestrial background
A radar echo and wind turbine technology, applied in radio wave measurement systems, instruments, etc., can solve the problem that there is no radar echo solution method for wind turbine blades.
Inactive Publication Date: 2017-05-10
CHINA THREE GORGES UNIV
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Problems solved by technology
Obviously, in the study of the echo Doppler characteristics of wind turbines, the influence of the ground cannot be avoided
Moreover, there is currently no relevant patent related to the method for solving the radar echo of wind turbine blades considering the influence of the earth
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[0085] According to the above steps, solve the radar echo of a certain wind turbine under the background of the wind turbine. The blade length of the wind turbine is 26m, the tower height is 55m, the number of blades is 3, the rotational angular velocity is 20rad / min, and the distance from the center of the blade to the radar is 10km. The frequency of the radar transmitting signal is 1GHz, the pulse repetition frequency is 1000Hz, and the pulse width is 1μs. In order to more clearly analyze the wind turbine echo in the presence of flat ground and slopes, the azimuth angle α=π / 6, the pitch angle β=π / 7, and the angle between the slope and the horizontal plane are γ=π / 6. The time-frequency diagram of the wind turbine radar echo in the absence of the earth, the time-frequency diagram of the wind turbine radar echo in the flat background and the time-frequency diagram of the wind turbine radar echo in the slope background are obtained respectively, as follows: Figure 5 , Figure...
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The invention relates to a radar echo solving method of a wind motor in a terrestrial background. By virtue of a principle of energy attenuation of electromagnetic wave propagation, a propagation line of electromagnetic waves is determined to introduce influence of terrestrial scattered radar electromagnetic waves on radar echoes of the wind motor. The method comprises the following steps: firstly, determining the radar echo propagation line of the wind motor in the terrestrial background by applying the principle of energy attenuation of electromagnetic wave propagation; secondly, separately solving radar echoes of the wind motor in four lines in a flat background by virtue of image theory, and then solving the radar echoes of the wind motor in the flat background by virtue of superposition principle; and finally, separately solving the radar echoes of the wind motor of four lines in a slope background by virtue of image theory and coordinate rotation principle, and solving the radar echoes of the wind motor in the slope background by virtue of superposition principle. The invention can provide a method for more effectively recognizing a wind motor target by a radar station, thereby further providing a theoretical foundation for follow-up characteristic extraction of noise waves of the wind motor and inhibition thereof.
Description
technical field [0001] The invention discloses a method for solving radar echoes of wind generators under the ground background, and belongs to the field of electromagnetic compatibility between wind farms and radar systems. Background technique [0002] With the vigorous development of wind energy, the electromagnetic interference of an increasing number of wind farms on adjacent radar stations is becoming more and more prominent, especially when the blades rotate relative to the radar, there will be a real-time and continuous positional migration, thus to the outer space. Scatteres unique Doppler-shifted radar echoes. Therefore, accurate acquisition of wind turbine radar echoes with complete Doppler features is an effective way to filter wind turbine clutter on the radar side. [0003] There are mainly four types of existing methods for obtaining radar echoes of wind turbines: the method of scale model experiment, the high-frequency approximation algorithm based on ray tr...
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Login to View More IPC IPC(8): G01S7/36G01S7/40
CPCG01S7/36G01S7/40
Inventor 唐波邹芳黄力叶莉王爽黄汉生孙子昂
Owner CHINA THREE GORGES UNIV