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根据微波着陆系统的技术体制和导航原理,应用电磁相似理论,将机场微缩到室内,微波波段微缩到光波段,建立基于缩比模型的微波着陆系统机场场地多径效应的半实物仿真系统,利用激光在缩比模型下的传播模拟微波载波在实际机场场地环境下的辐射。鉴于模型系统中电磁波频率不能精确相似,提出了双尺度的缩比实验方法。以雷达散射系数为依据,对原型系统和模型系统下不同类型散射体的电磁散射特性的数值仿真结果进行了比较,分析了两个系统电磁波散射的相似性。通过模拟试验,验证了该仿真系统的可行性。
According to the technical system and navigation principle of microwave landing system, the electromagnetic similarity theory is used to miniaturize the airport into the room and the microwave band to the light band. The hardware-in-the-loop simulation system of the multipath effect in the airport of the microwave landing system based on the scaling model is established. Propagation of laser in a reduced-ratio model simulates the radiation of microwave carriers at the actual airport environment. In view of the fact that the electromagnetic wave frequencies in the model system can not be exactly similar, a two-scale scaling experiment method is proposed. Based on the radar scattering coefficient, the numerical simulation results of the electromagnetic scattering characteristics of different types of scatterers under the prototype system and the model system are compared, and the similarities between the two systems are analyzed. Through the simulation test, the feasibility of the simulation system is verified.