旋转螺旋浆对机载雷达探测性能影响研究

Study on Effect of the Rotating Propeller for Airborne Radar Detection Performance

针对载机旋转螺旋桨影响机载雷达探测性能问题,首先通过分析研究载机螺旋桨对机上雷达信号调制特性的影响,建立了载机螺旋桨影响雷达信号的相参回波模型,并对旋转螺旋桨对雷达回波信号的幅度和相位调制特性进行了理论仿真分析,从理论上粗略建立了部分接收能量被螺旋桨调制的信号模型,分析了载机螺旋桨旋转对雷达信号的寄生调频调幅影响,最后提出了对螺旋桨桨叶材料透波性的要求。载机发动机螺旋桨的旋转对雷达信号具有频率调制影响,雷达调制信号的幅度和频率分别与载机螺旋桨的材质、角度和转速相关。此结论可用于载机螺旋桨桨叶材料的选择和雷达对低速目标的探测能力评估。

For the problem that the rotating propeller of the aircraft affects detection performance of airborne radar,firstly,the influence of airborne propeller on the modulation characteristics of airborne radar signal is analyzed and studied,and the coherent echo model of airborne propeller affecting radar signal is established,and then the amplitude and phased modulation characteristics of airborne radar echo signal are theoretically simulated and analyzed.Theoretically the signal model that part of the received energy modulated by the propeller is established,and the parasitic FM and AM effects of the propeller rotation on radar signals are analyzed,finally,the requirement of propeller blade material wave penetration is put forward.The forehead rotation of airborne engine propeller has frequency modulation effect on radar signal.The amplitude and frequency of radar modulation signal are related to the material,angle and speed of airborne propeller.Respectively,simulation results show that the conclusion can be applied to select.