直升机的雷达回波仿真研究

Simulation of Radar Echo from Helicopter

针对雷达在悬停直升机检测和直升机识别研究等的需要,研究了宽带调频雷达的直升机回波仿真方法。在旋翼单频回波模型基础上提出了旋翼宽带调频回波模型。根据现有雷达的实际情况,将机身回波等效为机身上若干散射中心散射回波的相干迭加。采用加性高斯白噪声模拟雷达环境噪声及接收机热噪声。直升机的雷达仿真回波可由旋翼回波、机身回波和高斯白噪声几部分相干合成得到。仿真的直升机雷达回波与理论分析较为相符。在外场数据较为缺乏的情况下,仿真结果可用于直升机雷达回波特性研究,进而在悬停直升机检测和直升机识别工程应用中发挥重要的作用。

In view of the demand for researching the radar detection of hovering helicopter and recognition of the helicopter, a simulation method of broad band FM radar echo from helicopter is researched. A model of the broad band FM radar echo from rotation blades is presented. According to the radar in existence, the paper takes the echo of helicopter body as the sum of the echo from several scattering centers on the helicopter body, and simulates the radar environment noise and radar receiver heat noise with additive white Gaussian noise. The simulation radar echo of helicopter is the coherent sum of radar echo from rotation blades, helicopter body and additive white Gaussian noise. The simulation radar echo of helicopter conforms to the result of theoretical analysis. When there are few radar echo data from helicopter recorded in outfield, the simulation result can be used to research the characteristic of radar echo from helicopter, and play an important role in applications of radar detection of hovering helicopter and recognition of the helicopter.