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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。
For a fully-polarized microwave radiometer using a correlation detection system, mutual coupling and phase imbalance of the channels cause crosstalk between the channels of the receiver, which results in the calibration of this type of radiometer being different from the conventional two-point calibration. The article first analyzes the sources of channel mutual coupling and phase imbalance with practical factors, and establishes a fully polarimetric radiometer receiver model. Based on this model, the channel mutual coupling and phase are analyzed from the perspective of complex signal transmission The influence of the balance on the Stokes vector measurement is discussed. The range of channel isolation and phase imbalance control is given in combination with the requirement of wind field inversion for calibration accuracy. Finally, the full polarization calibration standard that can be used to correct the influence of channel crosstalk is simulated. .