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The radar cross section RCS is a useful figure for the characterization of objects in space for radar systems. Electrically large objects on the ground, such as wind turbines WT, do not meet the basic conditions of a plane wave excitation. Measured or calculated RCS according to the standard definition cannot be used for safeguarding and the characterization of WT.
Wind turbines WT are often to be located in some distance to ground based navigation, landing and radar systems. Unacceptable distortions which harm the mission of the systems have to be avoided. The minimum actual permissible distance to the system has to be determined in some way - often done by the RCS scheme for radar systems. It is recalled and shown again by theoretical as well as for numerical...
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