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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Interferometric Processing of Sentinel-1 TOPS Data
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Interferometric Processing of Sentinel-1 TOPS Data

机译：Sentinel-1 TOPS数据的干涉测量处理

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摘要

Sentinel-1 (S-1) has an unparalleled mapping capacity. In interferometric wide swath (IW) mode, three subswaths imaged in the novel Terrain Observation by Progressive Scans (TOPS) SAR mode result in a total swath width of 250 km. S-1 has become the European workhorse for large area mapping and interferometric monitoring at medium resolution. The interferometric processing of TOPS data however requires special consideration of the signal properties, resulting from the ScanSAR-type burst imaging and the antenna beam steering in azimuth. The high Doppler rate in azimuth sets very stringent coregistration requirements, making the use of enhanced spectral diversity (ESD) necessary to obtain the required fine azimuth coregistration accuracy. Other unique aspects of processing IW data, such as azimuth spectral filtering, image resampling, and data deramping and reramping, are reviewed, giving a recipe-like description that enables the user community to use S-1 IW mode repeat-pass SAR data. Interferometric results from S-1A are provided, demonstrating the mapping capacity of the S-1 system and its interferometric suitability for geophysical applications. An interferometric evaluation of a coherent interferometric pair over Salar de Uyuni, Bolivia, is provided, where several aspects related to coregistration, deramping, and synchronization are analyzed. Additionally, a spatiotemporal evaluation of the along-track shifts, which are directly related to the orbital/instrument timing error, measured from the SAR data is shown, which justifies the necessity to refine the azimuth shifts with ESD. The spatial evaluation indicates high stability of the azimuth shifts for several slices of a datatake.
机译：Sentinel-1（S-1）具有无与伦比的映射能力。在干涉式宽测绘带（IW）模式下，新型渐进扫描地形观测（TOPS）SAR模式中成像的三个子带的总测绘带宽度为250 km。 S-1已成为中分辨率大面积测绘和干涉监测的欧洲主力军。然而，TOPS数据的干涉测量处理需要特别考虑信号属性，这是由ScanSAR型猝发成像和天线波束方位角引起的。方位角中的高多普勒频率设置了非常严格的共轴性要求，从而使用了增强的频谱分集（ESD），以获得所需的精细方位角共聚精度。回顾了处理IW数据的其他独特方面，例如方位角频谱滤波，图像重采样以及数据去斜坡和重新斜坡，给出了类似配方的描述，使用户社区可以使用S-1 IW模式重复通过SAR数据。提供了来自S-1A的干涉测量结果，证明了S-1系统的制图能力及其对地球物理应用的干涉测量适用性。提供了在玻利维亚乌尤尼盐沼上的相干干涉对的干涉测量评估，其中分析了与配准，解斜坡和同步有关的几个方面。此外，还显示了根据SAR数据测量的与轨道/仪器定时误差直接相关的沿轨偏移的时空评估，这证明了用ESD改善方位角偏移的必要性。空间评估表明，数据采集的多个切片的方位角偏移具有很高的稳定性。

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