在毫米波雷达体制下,针对直升机旋翼旋转对雷达波的多普勒调制效应进行了研究,引入旋翼面模型并推导了旋翼回波公式,并对根据面模型仿真的旋翼回波信号的时频域特性进行了分析.结果表明,旋翼回波可等价地看作由旋翼中心点绕转轴旋转所得回波为载频,其幅度包络是旋翼中线旋转包络与旋翼底边旋转包络的乘积.与线模型仿真结果比较,主闪烁脉冲幅度大大消弱,在主闪烁脉冲之间出现了幅度较小的闪烁脉冲.

In this paper,We research in the doppler modulation effect of the rotor blades of the helicopter under the millimeter wave radar,introduce the surface model of the rotor blade and deduct the formulation of the radar echo backscattered from the rotor blades,then analysis the characteristic in time and frequency domain.It can be deducted that the rotor blade echo can be equivalent to taking the echo of rotor blade center as the carrier frequency and the product between envelope of rotor blade's midline and envelope of rotor blade's base line.

TN958