利用激波与电磁波相互作用的新型雷达机理研究
A Study on New Detection Mechanism of Radar Based on the Interaction Between Shock Waves and Electromagnetic Waves

针对飞行器超声速飞行时会产生激波,且无法消除其激波层的现象,提出了一种利用激波探测超声速飞行器的新型雷达探测方法,深入研究了激波与电磁波相互作用机理。采用模型仿真和实验验证相结合的方法确定了激波层内参数变化规律,并按照收敛原则确定了激波的等效层数,随后开展了飞行器激波与线极化波的相互作用机理研究。结果表明:平面极化波在现有雷达波频段范围内入射到激波层中时,其反射系数随入射波入射角度、飞行马赫数的增加而增大,随飞行高度的增加而减小,随频率变化呈现周期性振荡衰减特性,且振荡周期随飞行高度增加而减小,随飞行马赫数增加而增大。该研究结果为利用激波层探测超声速隐身飞机提供了一种新思路、新方法。
A new type of radar detection method using shock waves to detect supersonic aircrafts is proposed to make use of the phenomenon that aircraft flying at supersonic speed would produce shock wave, and there is no ways to eliminate the shock layer, and the interaction mechanism between the shock waves and electromagnetic waves is studied. A combination of model simulation and experiments is adopted to determine the rule of parameter variation in the shock layer, and to determine the number of equivalent levels of shock wave using the convergence principle. Then the interaction mechanism between shock wave and linear polarized wave is studied. Results show that when the polarized plane waves in the range of radar wave frequencies enter to the shock wave, the reflection coefficient increases with the increase of the incident angle of incident wave and flight Mach number, and decreases with the increase of altitude, and that there is a periodic oscillation attenuation characteristic with variation in frequency, and the oscillation period decreases with the increase of altitude, and increases with the increase of flight Mach number. This study may provide a new way to use radar to detect supersonic stealth aircraft using shock layer