导航卫星天线收发系统耦合分析与仿真

The Analysis and Simulation of Navigation Transmitted and Received Antenna System Coupling

导航卫星天线系统由接收天线系统和发射天线系统组成,发射天线系统为多频段工作模式。接收天线系统为单频段工作模式。当多个频段的信号经过发射天线系统后的三阶无源互调产物落入接收天线系统工作带宽内时,如果无源互调电平大于接收信号电平,则将严重影响导航卫星接收系统的正常工作。为此,应尽量提高发射天线与接收天线之间的隔离度,使已产生的无源互调电平得到有效衰减,从而不影响正常接收信号的工作。文章从微波网络S散射矩阵出发,结合电磁场专用软件,给出了两种卫星平台上的发射和接收天线之间隔离度的仿真分析结果,为导航卫星天线布局提供依据。

The navigation satellite antenna system is consisted of the received antenna sub-system and the transmitted antenna subsystem. The transmitted antenna sub-system operated in multi-frequency band and the received antenna sub-system operated in single frequency band. The third order PIM production will be radiated when multi-frequency RF signal working in the transmitted antenna sub-system. It will operate in the received antenna sub-system. If the PIM production power level is more than the received power level, the received system of navigation satellite will be not work in correctly. The PIM production received in the received system can be reduced by improving the isolation of the transmitted and received system. Based on the S matrix of the multi-port network and EM software, the isolation simulation result of the transmitted and received antenna in two kinds of Satellite platform had been achieved in this paper. The distribution of the antenna in satellite platform had been completed in according to the simulation result.