Radon-Wigner变换在旋翼回波检测中的应用  

Application of Radon-Wigner Transform in the Detection of Blades Echo

作　　者：叶玲平[1] 诸四海[1] 陈国宏[1] 

机构地区：[1]南京电子技术研究所,南京210039

出　　处：《现代雷达》2013年第8期55-58,共4页Modern Radar

摘　　要：悬停直升机的检测主要依靠其大而长的旋翼,文中从直升机旋翼回波的理论模型出发,分析了旋翼回波的时域、频域和时频分布的特性,与一般点目标相比,旋翼回波在频域上进行了扩展而增加了检测难度。根据时频分布特点提出了利用其Radon-Wigner变换对其不同频率的能量进行积累,仿真结果表明,Radon-Wigner变换能够积累旋翼目标回波扩展的频谱能量,提高检测性能。The detection of hovering helicopter mainly depends on its big and long rotating blades. According to its theoretical models, blades echo＇s time, frequency domain and time-frequency distribution characteristics is analysed in this paper. Compared with conventional target, blades echo is more difficult to detect because of its extension in frequency domain. Based on its time-frequency distribution characteristics, Radon-Wigner transform is proposed to accumulate the energy in different frequency. The simulation results show that the Radon-Wigner transform can accumulate blades echo＇s energy in different frequency, and improve the detec- tion performance.

关 键 词：Wigner-Ville时频分布 RADON变换 旋翼回波 多普勒频谱 

分 类 号：V243[航空宇航科学与技术—飞行器设计]