一种改进的基于干涉相位的基线估计方法

该文研究了基于干涉相位的基线估计方法，对原有基于干涉相位傅里叶变换的算法从4个方面进行了改进。提出了精确计算干涉相位瞬时频率的方法；指出了干涉相位样本区域分布原则，能够有效改善采用最小二乘拟合方法时方程的病态性；提出了能够有效剔除干涉相位噪声较大及地形变化剧烈区域对估计精度影响的定量化样本区域选取准则；通过计算差分干涉相位迭代求解优化估计精度。利用改进算法对双天线干涉和重轨干涉数据进行了基线估计，结果表明该文算法相比原有算法鲁棒性和精度都大大提高，适合机载重轨干涉SAR的基线估计。

An Improved Baseline Estimation Approach Based on the Interferometric Phases

In this paper, an improved baseline estimation approach based on the Fourier analysis of the interferometric phases is presented. Four improvements are made: a precise method to calculate the instant phase frequency is given; the rule of distributing the interferogram samples is given to improve the ill condition of the equations of least square method; a quantitative criterion of choosing the interfrogram samples is presented which can exclude the influences of interferograms corresponding to areas of low correlation or strong topography variations; an iterative scheme based on the differential interferometric phases is given. The improved approach is used in the processing of the airborne dual-antenna and repeat-pass InSAR data. The results validate that the improved approach is more accurate and robust than the original one. This improved approach is suit for the baseline estimation of the airborne repeat-pass InSAR data.