基于动态RCS特征相似的直升机靶机旋翼设计

doi:10.7527/S1000-6893.2021.25465

Abstract

Abstract: This study aims to obtain a helicopter target design scheme with similar rotor dynamic Radar Cross Section (RCS) characteristics of full-scale helicopters. An RCS high-frequency prediction method and a time-frequency analysis method suitable for extraction and analysis of dynamic rotor radar echo signals are firstly established. Then, the effects of the rotor parameters on the micro-Doppler characteristics and amplitude of the rotor RCS are studied, and the similarity conditions for the maximum rotor radar micro-Doppler frequency derived. It is found that by designing the target rotor with a smaller radius and blade number according to the similarity conditions, the maximum radar micro-Doppler frequency characteristics of the target rotor could be similar to those of the goal rotor, and further changes in the airfoil thickness could match the target rotor dynamic RCS time domain signal strength. Finally, the dynamic RCS frequency domain and time domain characteristics of different rotors are comprehensively compared, and the optimal scheme to simulate the radar scattering characteristics of the goal rotor proposed (the maximum radar micro-Doppler frequency being the same, and the error of RCS intensity being less than 0.408 dB) so as to realize the goal of similarity design of the target helicopter rotor RCS time-frequency characteristics.

Key words: helicopter targets, rotors, high-frequency prediction method, time-frequency analysis method, dynamic RCS, similarityhttp

CLC Number:

V218
TJ02

FEI Zhongyang, JIANG Xiangwen, ZHAO Qijun. Design of helicopter target rotor based on similar dynamic RCS characteristics[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(7): 125465.

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Design of helicopter target rotor based on similar dynamic RCS characteristics

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