交叉极化隔离度对射频仿真模拟精度影响分析

Analysis of influence of cross polarization isolation on radio frequency simulation accuracy

射频仿真系统可以通过控制四脊圆锥喇叭天线两路正交信号幅度和相位实现不同极化的模拟。但该系统存在交叉极化信号,将会产生极化模拟误差和两路正交极化信号角位置模拟偏差。为此,文中通过建立三元组辐射合成信号模型,分析不同交叉极化隔离度对极化轴比和极化倾角模拟误差的影响;同时,根据三元组角位置模拟模型计算不同交叉极化隔离度对两路正交极化信号角位置模拟精度的影响程度。分析结论可指导射频仿真系统工程建设。

The RFSS(radio frequency simulation system)can realize the simulation of different polarization by controlling the amplitude and phase of two orthogonal signals of the four ridged conical horn antenna.However,the system has cross polarization signals,which will result in polarization simulation errors and deviation in the angular position simulation of two orthogonal polarization signals.A triplet radiation synthesis signal model is established to analyze the impact of different cross polarization isolation degrees on the simulation error of polarization axis ratio and polarization inclination angle.The influence degree of different cross polarization isolation degrees on the accuracy of angle position simulation of two orthogonal polarization signals is calculated based on the triplet angle position simulation model.The analysis conclusion can be used to guide the engineering construction of RFSS.