综合孔径微波辐射计互耦模型与校正方法

Mutual coupling model and calibration method for synthetic aperture microwave radiometer

利用阻抗参数法分析天线互耦,根据综合孔径微波辐射成像原理,通过耦合矩阵建立了综合孔径微波辐射计互耦模型。用给出的模型,对互耦引起的反演亮温失真和校正方法进行了深入的理论分析,并给出通过优化天线匹配网络减小互耦影响的方法。仿真结果表明了互耦模型和校正方法的有效性,清晰地反映了互耦造成的反演误差。

In this paper,the effect of antenna mutual coupling is analyzed using Zparameter method. A mutual coupling model for synthetic aperture microwave radiometer is established based on the principle of synthetic aperture microwave imaging. Using the proposed model, we give thorough theoretical analysis for the brightness temperature retrieval distortion due to mutual coupling and its calibra- tion method. We also give a method to reduce mutual coupling effect by optimizing antenna matching network. Simulation results show the effectiveness of the pro- posed mutual coupling model and calibration method,and clearly show the inversion error due to mutual coupling.