![]() ![]() It is necessary to take the phase change of the reflected signal into account as accurately as possible when developing an ISAR algorithm for imaging the main rotor. Such movements and bendings of the blades are influence the phase of the signal reflected from the main rotor. In the process of moving each blade of the helicopter main rotor makes characteristic movements (flapping, dragging, feathering), as well as bends in a vertical plane. The models used to describe the reflection from the propellers of helicopters and fixed-wing aircraft have significant differences. The propeller blades in the models are approximated by different geometric shapes. ISAR processing is used to produce a radar image of a propeller in a radar with a monochromatic probing signal. The aim of this paper is to develop mathematical models of the radar signal reflected from the helicopter main rotor applied to inverse synthetic aperture radar (ISAR). ![]() The basis for obtaining such images are mathematical models of reflected signals. ![]() These images allow us to distinguish the number and relative position of the propeller blades, as well as the direction of its rotation. Portraits, which are radar images of the propellers of aerial vehicles, have high informativeness. The basis for solving the problem of aircraft recognition is the formation of radar portraits, reflecting the constructive features of aerial vehicles. ![]()
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