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摘要: 采用基于永久散射体(PS)技术的大气相位(AP)补偿方法对地基干涉合成孔径雷达(GB-InSAR) 干涉相位图进行分析时，部分图像的干涉相位随距离呈现出复杂的非线性，导致无法建立合理的多参数模型来模拟大气相位，常规的补偿方法不再适用。该文提出一种改进的GB-InSAR图像非线性大气相位补偿方法，首先采用常规方法对干涉相位图进行大气相位补偿，并根据PS点的补偿后相位序列的标准差，进行稳定PS点的选择，然后对稳定PS点进行子区域划分，通过反距离加权插值估计出所有PS点的大气相位，从而实现大气相位的有效补偿。采用该文所提方法，对460幅雷达图像进行了处理，相比于常规方法，可以有效地补偿干涉相位图中的非线性大气相位分量。基于若干高稳定参考点的对比结果表明，该方法减小了最大约1 rad的相位测量误差。
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关键词:
- 地基干涉合成孔径雷达 /
- 大气相位补偿 /
- 非线性变化 /
- 稳定永久散射体 /
- 反距离加权插值
Abstract: When the Permanent Scatterer (PS) technique is utilized to compensate the Atmospheric Phase (AP) for Ground-Based Interferometric Synthetic Aperture Radar (GB-InSAR) images, a proper parametric model should be built to describe the AP. However, for some interferograms, the AP may nonlinearly vary with the PS range, and this cannot be effectively compensated via the conventional method. This paper proposes an improved method to compensate the nonlinear AP. Here, the conventional method is first used to compensate all the phase interferograms. By calculating the standard deviation of the phase sequence of every PS and setting a proper threshold, a large number of stable PSs are selected. Then these stable PSs are divided into a certain number of sub-regions, and some control points are determined. With the inverse distance weighting interpolation, the APs of all the PSs are estimated and compensated. To verify the effectiveness of the proposed method, 460 radar images are processed, and the results are made compared with those of the conventional method. The nonlinear AP could be better compensated with the proposed method to avoid misunderstanding of the motional area. Several reference PSs are selected to make quantitative comparisons, and measurement error up to 1 rad could be reduced. -
图 5 短时间基线干涉相位图A和B
Figure 5. Interferometric phase maps of A and B with short temporal baselines
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