船载卫通天线圆极化方式切换改进方案

Improvement Plan of Circular Polarization Switching of Ship Satellite Communication Antenna

对船载卫通天线圆极化状态下A、B极化切换方案进行了分析,阐述了现行切换方案会改变和差通道传输特性,致使跟踪接收机校相值全部作废的缺点。由此提出了在原和差网络的基础上,增加组成B极化和差网络的改进方案,以及将圆极化器单向转动的基础上,增加反方向转动45°的改进方案。这2套改进方案均易于实现,且均克服了现行方案的不足,可在不改变和差通道传输特性的条件下快速完成极化切换。

This article makes an analysis for the plan A and B polarization switching in the state of circular polarization in ship satellite communication aerial, sums up the shortcomings of present switching plan that might change communication characteristics of sum-difference channel. And it points out two improving plans of combining B polarized sum-difference net and turning 45° to opposite direction of circularly polarized ware. The two improving plans, easy to be realized, overcome the shortcomings of present plan, can rapidly fulfill the polarization switching without changing the characteristics of sum-difference channel.