基于微多普勒分析的直升机旋翼参数估计

摘要

针对直升机的分类和识别问题,提出一种利用微多普勒特征估计直升机旋翼参数的方法.建立单频信号下直升机旋翼微动模型和回波模型,定量分析直升机旋翼的微多普勒调制特征,及其与旋翼旋转速度、旋翼叶片长度和旋翼叶片片数之间的关系,利用平滑伪Wigner-Vill分布和图像处理相结合的方法提取微多普勒调制特征,估计直升机旋翼的相关微动参数.仿真结果证明了该方法的有效性.%Aimed to classification and recognition of helicopter, a helicopter rotor parameters estimation method using micro-doppler characteristics is proposed. Motion dynamics and echo models of the blades of helicopter in single frequency are set up. The micro-doppler modula- tion of the blade, the relations of micro-doppler modulation and the rotational speed, the blade length and the number of blades are quantitatively analyzed. It extracts micro-doppler modulation and estimates those parameters methods by smoothed pseudo Wigner-Ville distribution and image processing. Simulation demonstrates the validity of the method.