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波束组合器是复合制导半实物仿真系统中的关键设备,为了分析半实物仿真系统中微波传输过程和有效地研究波束组合器对微波场的影响,利用四端口网络法对该波束组合器的结构进行了设计。针对波束组合器对微波传输特性的影响进行了实验研究,主要包括微波传输振幅的衰减和微波传输方向的变化情况。同时建立了该系统的理论模型,最后采用物理光学法对框架绕射引起的相对相位变化进行了仿真验证,仿真结果和实测结果相符合,即不同微波频率造成的波束组合器的振幅衰减和微波传播方向不同,发射天线的偏移会引起振幅和相对相位差变化。
In order to analyze the microwave transmission process in semi-physical simulation system and study the effect of beam combiner on the microwave field effectively, the beam combiner is a key device in the semi-physical simulation system of composite guidance. By using the four-port network method, the structure of the beam combiner Have a design. The influence of the beam combiner on the microwave transmission characteristics is studied experimentally, including the attenuation of microwave transmission amplitude and the change of microwave transmission direction. At the same time, the theoretical model of the system is established. At last, the relative phase change induced by the diffraction of the frame is verified by the physical optics method. The simulation results agree well with the measured results, that is, the amplitude attenuation and microwave attenuation of the beam combiner caused by different microwave frequencies Different propagation directions, the launch of the antenna offset will cause the amplitude and relative phase difference changes.