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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 large and long rotor. Based on the theoretical model of helicopter rotor echo, the characteristics of rotor echo in time domain, frequency domain and time-frequency distribution are analyzed. Compared with the general point target, Rotor echo has been extended in the frequency domain to increase the detection difficulty. The Radon-Wigner transform is used to accumulate the energy at different frequencies according to the time-frequency distribution. The simulation results show that the Radon-Wigner transform can accumulate the spectral energy of the rotor target echo spread and improve the detection performance.