直升机旋翼桨叶外形对雷达特征信号的影响

doi:10.7527/S1000-6893.2014.0060

Abstract

Abstract:

The time-frequency domain analyses about rotor blade shape on its signal echo characteristics combining the physical optics method, the equivalent currents method and the quasi-stationary method have been investigated. Firstly, the effects and response characteristics of the rotor radar cross section (RCS) with multi factors such as airfoil parameters, blade-tip backward swept and anhedral have been carried out. Then time-frequency domain changes of echo signal of rotor about different blade numbers and blade-tip swept angle have been presented, as a result, the scattering reduced blade number choice and strong scattering regions are obtained. Simultaneously, moment and times of rotor RCS flash are discovered and extracted from time-frequency domain information grayscale. It shows that blade-tip backwara swept is one of the important and strong scattering sources. Comparing 3 or 5 blades with 4 blades rotor, the peak of rotor RCS can be reduced by 2.32 dB·m² or 2.52 dB·m² respectively, which is conducive to control peak of rotor RCS. The maximum radar detecting distances about RCS peak value of rotor with NACA0006 airfoil are 38.6% and 41.8% of that of rotor with NACA0024 airfoil respectively, providing the best comprehensive stealth performances.

Key words: rotor, aerodynamic shape, micro-Doppler effect, radar cross section, quasi-stationary method, time-frequency analysis

CLC Number:

V218
TN974

JIANG Xiangwen, ZHAO Qijun, MENG Chen. Effect of Helicopter Rotor Blade Shape on Its Radar Signal Characteristics[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014, 35(11): 3123-3136.

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Effect of Helicopter Rotor Blade Shape on Its Radar Signal Characteristics

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