基于散射理论的电磁波正演研究

Research on Electromagnetic Wave Forward Simulation Based on Scattering Theory

电磁波在雷达探测、导航定位、通信中都有较为广泛的应用。发射电磁波,遇到目标之后被反射回来,通过处理回波信息从而得到目标的距离、速度、角度等信息,这是最常用到的一种处理方式。基于散射波目标探测方法是当电磁波传播到目标界面时,会以目标反射界面上各点作为激发源继续向外传播,通过接收并处理返回的散射波,从而获取目标的信息。在麦克斯韦(Maxwell)方程组的基础上,基于散射理论,推导并给出了电磁波在频率域的散射波表达式。这种基于散射波进行目标探测的方法,在无源定位、相隔较近的机动目标识别、小目标识别等方面有一定的优势。

Electromagnetic wave is widely used in radar detection, navigation and communication. The electromagnetic wave is emitted, and it is reflected back after encountering the target. The distance, velocity, angle and other information of the target are obtained by processing the echo information. This is the most commonly used processing method. The realization process of the method based on the scattered wave target detection is that when the electromagnetic wave propagates to the target boundary, it will continue to propagate outward with the convergent point on the target interface as a new excitation source. By receiving and processing the received scattered wave, the location information of the target can be obtained. Based on the Maxwell equations and scattering theory, the expression of the electromagnetic scattered wave in the frequency domain is guided and given. This method of target detection based on scattered wave has certain advantages in passive location, and small target recognition.