基于几何绕射理论模型高精度参数估计的多频带合成成像

摘要

针对多频带信号融合成像的相干化处理，论文提出一种基于几何绕射理论模型高精度参数估计的多频带合成算法。该方法利用不同频带的全极点模型中极点及散射中心幅度的相位差异来估计非相干量，通过缺损数据幅度相位联合估计算法对相干化处理后的频带数据进行填补，利用全频带数据对几何绕射-全极点模型参数进行精确估计，得到融合数据。实验表明，由融合数据得到的1维距离像和ISAR像的分辨率高于单个频带数据得到的结果，从而验证了该方法的有效性。%This paper focuses on multi-band fusion imaging. A method based on high-precision parameter estimation of Geometrical Theory of Diffraction (GTD) model is given. It makes use of the phase difference of pole and scattering coefficient between the all-pole model of each sub-band to estimate the incoherent components. The gapped-data amplitude and phase estimation algorithm is adopted to fill up the gapped band. Finally, fusion data is gained by high precision parameter estimation of geometrical theory of diffraction-all-pole model with full-band data. The simulation indicates that the resolution of 1D range profile and 2D ISAR image based on this method is better than that of sub-band. In this way, the effectiveness of the method is verified.