极化相关微波辐射计通道串扰影响分析及其校正  

Analysis and Calibration of Polarization-Correlating Microwave Radiometer of Crosstalk Between Channels

作　　者：金旭[1] 段崇棣[1] 张廷新[2] 欧祥荣[1] 

机构地区：[1]中国空间技术研究院西安分院,西安710000 [2]中国空间技术研究院,北京100081

出　　处：《空间电子技术》2012年第2期26-31,43,共7页Space Electronic Technology

摘　　要：对于采用相关检测体制的全极化微波辐射计,通道互耦和相位不平衡使得接收机各个通道间发生串扰,从而导致该类型辐射计的定标有别于传统的两点定标。文章首先结合实际因素分析了通道互耦和相位不平衡的来源,建立了全极化辐射计接收机模型,然后以该模型为基础,从复信号的传输角度出发分析了通道互耦和相位不平衡对Stokes矢量测量的影响,结合风场反演对定标精度要求,给出了通道隔离和相位不平衡控制范围,最后对可用于校正通道串扰影响的全极化定标标准进行了仿真验证。Mutual coupling and phase imbalance between channels cause crosstalk to all receiver channels of a fully polarimetric microwave radiometer that uses coherent detection.This makes the calibration method different from the conventional two-look calibration scheme.This article begins with analysis on the sources of above two factors and develops a model for the receiver.Based on this model,the effects on Stokes vector measurements of mutual coupling and phase imbalance in terms of complex signal transmission are discussed.Through derivation and analysis,it is shown that crosstalk between channels can be compensated for by a fully polarimetric calibration method.Finally,fully polarimetric calibration standard is validated via simulation based on the model of fully polarimetric radiometer.

关 键 词：微波辐射计 极化相关 串扰 校正 

分 类 号：TP7[自动化与计算机技术—检测技术与自动化装置]