| Citation: | YANG Yan, FEI Zhongyang, ZHAO Qijun, et al. Analysis of dynamic electromagnetic scattering characteristics of compound coaxial helicopter[J]. Journal of Aerospace Power, 2025, 40（6）：20240020 doi: 10.13224/j.cnki.jasp.20240020
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Under the trend of rapid development of compound coaxial helicopter, simulation analysis of dynamic electromagnetic scattering characteristics of compound coaxial helicopter was carried out systematically to explore its electromagnetic scattering law for stealth design and target recognition. A method of dynamic time-varying electromagnetic computing mesh that can characterize the coupled rotational motions of coaxial-rotor and tail rotor was constructed. The dynamic radar cross section (RCS) of the coaxial helicopter was calculated by the high frequency methods, and the contribution and influence mechanism of the coaxial-rotor and the tail rotor to the dynamic RCS of the whole helicopter were revealed, which layed a foundation for the sequence division of the RCS reduction of the dynamic and static components in the key threat azimuth of the helicopter. The change law and correlation of micro-Doppler of rotating parts were summarized, and an idea of identifying and judging the maneuvering intention of compound coaxial helicopter was proposed. The analyses showed that, in the existence of coaxial-rotor and tail rotor, the RCS of the whole aircraft exhibited dynamic periodic oscillation characteristics, and the oscillation amplitude was related to the static RCS of non-rotating components. The backward-swept blade tip could cause a micro-Doppler scintillation band that lagged behind the inner section of the blade in time, and the lag time depended on the blade rotation speed and the sweep angle of the blade tip. At any radar incident angle, the maximum micro-Doppler frequency shift of the coaxial-rotor and the tail rotor was represented by a set of determined values. By analyzing the micro-Doppler trend of these two, the flight attitude change of the helicopter can be accurately identified, and then its maneuvering intention can be inferred.
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