全极化微波辐射计天线方向图校正方法研究

摘要

全极化微波辐射计最主要的应用是海面风场监测.为了获得目标场景准确亮温,必须通过天线方向图校正算法将天线测量亮温转换为天线主波束视在亮温.相关型全极化微波辐射计天线方向图校正关键技术在于对第三、第四Stokes参数进行准确校正.在已有的理论基础上,考虑Stokes参数之间的互相影响,提出了一种高效、简便的全极化微波辐射计天线方向图校正算法,同时对该算法进行了较为深入的误差分析,仿真结果表明,该算法对天线方向图交叉极化校正效果明显.%Fully polarized microwave radiometer(FPMR) is primarily used in measuring wind vector over the ocean surface.To obtain the accurate brightness temperatures of target scene,the measured antenna temperatures must be changed into the main lobe top of atmosphere (TOA)brightness temperatures by algorithm of Antenna Pattern Correction (APC).The key technology of polarization-correlating microwave radiometer APC is the accurate correction of the third and the fourth Stokes parameter.This paper proposes an efficient,simple algorithm of APC for polarization-correlating microwave radiometer bases on existing antenna temperature equation with amplitude and phase of cross polarization between the 3th and 4th Stokes parameters in consideration and goes into error analysis to this algorithm meanwhile.The simulation result shows this algorithm effectively remove the antenna cross-polarization error