电磁逆散射无相位检测的相位复原  

Phase retrieval in EM inverse scattering from phaseless data

作　　者：张文吉[1,2] 李廉林[1] 李芳[1] 

机构地区：[1]中国科学院电子学研究所,北京100080 [2]中国科学院研究生院,北京100049

出　　处：《电波科学学报》2008年第4期727-731,共5页Chinese Journal of Radio Science

基　　金：国家自然科学基金资助项目(60701010,40774093)

摘　　要：利用入射场作为约束条件,用最优化泛函的方法由总场幅度信息重建散射场幅度和相位。分析了散射场自由度和噪声对重建结果的影响。讨论了成功实施相位复原和避免局部极小值的条件。首次用实验结果验证电磁逆散射无相位检测相位复原的可行性,证明了方法的有效性、高度稳定性和较强的抗噪声能力。该方法的计算成本低,实用性较强。研究结果是实施无相位检测电磁逆散射的基础。In this paper phase retrieval in electromagnetic inverse scattering is studied. Both the amplitude and phase of the scattered field are reconstructed from the amplitude of the total field by minimizing a functional that is the norm of the discrepancy between the measured amplitude and the calculated one. The incident wave is used as prior information in the procedure. The effect of degree of freedom of the scattered field and noise on the phase retrieval is analyzed, and the condition of avoiding local minimum is discussed. Experiment results are presented for the first time to show the feasibility of phase retrieval in electromagnetic inverse scattering from phaseless data. The experiment results also show the validity and stability of the method. Both the numerical simulation and the experiment results show that the method is very tolerant to noises. The phase retrieval method proposed will be of practical use for its low computation cost. The result founds a basis for the inverse scattering with phaseless data.

关 键 词：电磁逆散射 无相位检测 相位复原 自由度 实验验证 

分 类 号：TN011[电子电信—物理电子学]