InSAR Tropospheric Correction Method Incorporating Baarda Data Snooping and Its Application
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摘要:
为研究湍流大气延迟对时序InSAR（合成孔径雷达干涉测量）高精度精细化变形提取的影响，基于湍流大气延迟在时空域上的随机特性和对形变相位的剧烈影响特征，将湍流大气延迟视为时间序列上的粗差，采用Baarda粗差探测方法予以识别和去除，随后利用时空滤波法提取高精度形变信息，并通过模拟和Sentinel-1 SAR实测数据验证方法的有效性. 研究结果表明：与仅使用时空滤波法相比，本文方法获取的模拟数据形变速率残差标准差在稳定区域和形变区域分别降低约25.8%和16.0%；Sentinel-1 SAR数据获取的半变异函数相较于同空间尺度下的原始相位结果降低约74%，优于仅使用时空滤波法的65%. 该方法成功应用于巴基斯坦拉合尔市橙线轨道交通的精细化监测，发现橙线全线约17.6%处于地面沉降强发育区.
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关键词:
- 时序InSAR /
- 大气校正 /
- Baarda粗差探测 /
- 变形监测
Abstract:To investigate the impact of turbulent atmospheric delay on high-precision and fine-scale deformation extraction using time-series InSAR (Interferometric Synthetic Aperture Radar), the turbulent atmospheric delay was considered as a gross error in the time series, based on its random characteristics in the spatiotemporal domain and its significant impact on deformation phase. The Baarda data snooping method was first applied to identify and remove the turbulent atmospheric delay, followed by spatiotemporal filtering to extract high-precision deformation information. Simulation and Sentinel-1 SAR data have confirmed the effectiveness of the proposed method. Results show that compared to using only spatiotemporal filtering, the standard deviation of displacement rate residuals obtained from the simulated data using the proposed method is decreased by about 25.8% and 16.0% in the stable and deformation regions, respectively. For Sentinel-1 SAR data, the semi-variograms of the results are reduced by about 74% compared to the original phase at the same spatial scale, outperforming the 65% reduction achieved by spatiotemporal filtering alone. The proposed method has been successfully applied to the fine-scale monitoring of the Orange Line rail transit in Lahore, Pakistan, with 17.6% of the entire line found to be located in areas experiencing strong ground subsidence.
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图 1 引入Baarda粗差探测的InSAR大气校正方法
Figure 1. InSAR tropospheric correction method incorporating Baarda data snooping
图 6 研究区及Sentinel-1A影像覆盖范围
Figure 6. Study area and coverage of Sentinel-1A SAR imagery
图 7 仅时空滤波的时序形变相位及统计直方图
Figure 7. Time-series deformation phase and statistical histogram using only spatiotemporal filtering
图 8 实测Sentinel-1 SAR数据的大气校正
Figure 8. Atmospheric correction of measured Sentinel-1 SAR data
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