Methodology of a Troposphere Effect Mitigation Processor for SAR Interferometry

Adam, Nico

doi:10.1109/jstars.2019.2957919

Cited by 9 publications

(4 citation statements)

References 46 publications

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“…The atmospheric phase screen (APS) present in interferograms consists of a topography dependent part, and a topography independent part [68]. It has been demonstrated that the topography dependent component of the atmospheric phase screen may be reasonably predicted under certain conditions using only SAR data [69], or using auxiliary numerical weather models [70]. The topography independent part can be further decomposed into a relatively stable part over long spatial scales (> 50 km), and a part due to turbulent mixing with shorter spatial and temporal scales [7].…”

Section: Insar Applications In Norwaymentioning

confidence: 99%

The Extended Timing Annotation Dataset for Sentinel-1—Product Description and First Evaluation Results

Gisinger

Libert

Marinkovic³

et al. 2022

IEEE Trans. Geosci. Remote Sensing

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This paper introduces the extended timing annotation dataset (ETAD) product for Sentinel-1 (S-1) which was developed in a joint effort of German Aerospace Center (DLR) and the European Space Agency (ESA). It allows to correct range and azimuth timing of S-1 images for geophysical effects as well as for inaccuracies in synthetic aperture radar (SAR) image focusing. In combination with the precise orbit solution, these effects determine the absolute geolocation accuracy of S-1 SAR images and the relative collocation accuracy of repeat pass image stacks. ETAD contains the gridded timing corrections for the tropospheric and ionospheric path delays, the tidal-based surface displacements, and the SAR processing effects, all of which are computed for each data take using standard models from geodesy and auxiliary atmospheric data. The ETAD product helps S-1 users to significantly improve the geolocation accuracy of the S-1 SAR products to better than 0.2 m and offers a potential solution for correcting large scale interferometric phase variations. The product layout and the product generation are described schematically. The paper also reports first results for different SAR techniques: first, the improvement in geolocation accuracy down to a few centimeters by verification of accurately surveyed corner reflector positions in the range-azimuth plane; second, the well-established offset-tracking technique, that is used for systematic ice velocity monitoring of ice sheets and glaciers, where ETAD can reduce velocity biases down to subcentimetric values; and third, the correction of atmospheric phase contributions in wide-area interferograms used for national and European ground motion services. These early results proof the added value of the ETAD corrections and that the product design is well suited to be integrated into the processing flows of established SAR applications such as absolute ranging of targets, speckle/feature tracking and interferometry.

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Section: Insar Applications In Norwaymentioning

confidence: 99%

The Extended Timing Annotation Dataset for Sentinel-1—Product Description and First Evaluation Results

Gisinger

Libert

Marinkovic³

et al. 2022

IEEE Trans. Geosci. Remote Sensing

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“…The estimates are relative to a reference point and surface deformations are measured in the satellites line-of-sight (LoS) direction. The wide-area Sentinel-1 PSI processing is performed by a modified version of the PSI GENESIS processor (Adam et al 2013;Goel et al 2016;Adam 2019). The modifications include geodetic corrections, e.g., plate tectonic motion, solid earth tides (Rodriguez Gonzalez et al 2018), and tropospheric phase mitigation by a simulation and subtraction of the tropospheric delay using the ECMWF (European Centre for Medium-Range Weather Forecasts) ERA-5 numerical weather forecast model (Adam 2019).…”

Section: Sentinel-1 Psi Datasetmentioning

confidence: 99%

“…The wide-area Sentinel-1 PSI processing is performed by a modified version of the PSI GENESIS processor (Adam et al 2013;Goel et al 2016;Adam 2019). The modifications include geodetic corrections, e.g., plate tectonic motion, solid earth tides (Rodriguez Gonzalez et al 2018), and tropospheric phase mitigation by a simulation and subtraction of the tropospheric delay using the ECMWF (European Centre for Medium-Range Weather Forecasts) ERA-5 numerical weather forecast model (Adam 2019). The modifications are set-up that it is able to provide a high precision of deformation rate estimates, even over rural areas and large distances, e.g., more than 100 km (Parizzi et al 2021).…”

Section: Sentinel-1 Psi Datasetmentioning

confidence: 99%

Landslide activity detection based on Sentinel-1 PSI datasets of the Ground Motion Service Germany—the Trittenheim case study

Kalia

2022

Landslides

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Spaceborne interferometric synthetic aperture radar has been proven to be able to monitor slow deforming landslides with mm-precision. Continental- and nationwide-scale Sentinel-1 PSI (persistent scatterer interferometry) datasets with millions of deformation time series are publicly available, e.g., via the European Ground Motion Service or the Ground Motion Service Germany. This creates the possibility for an increased routine use of PSI for landslide applications. However, the use of PSI datasets is often done by visual inspection. The huge amount of measurements makes visual inspection, subjective, time-consuming, and error prone due to outliers. This study demonstrates how spatial and temporal patterns of the PSI velocity and time series can be detected in a semi-automatic way to improve objective information extraction. Therefore, two landslides, namely, Trittenheim and Piesport landslides, in Germany are analyzed using Sentinel-1 PSI datasets from the Ground Motion Service Germany. The post-processing technique semi-automatically detects spatial clusters of deforming PS with a maximum LoS velocity of 18 and 7 mm/a in Trittenheim and Piesport landslides, respectively. Furthermore, a correlation and time-lag between the surface deformation and a potential triggering factor is found. Results show that an increase in climatic water balance accelerates landslide deformation at the investigated locations. Results are verified by a second independent Sentinel-1 PSI dataset from the Ground Motion Service Germany.

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“…Sentinel-1 images are processed by means of a wide area PSI approach [27]. Numerical weather forecast data are used to mitigate the troposphere effect in the interferograms and thus, increase the precision of the results [28] A modified version of the 3-arc-second SRTM C-band digital elevation model (DEM) [29] was used to estimate and subtract the topographic phase from the interferograms. Since the BBD is produced from adjacent and overlapping frames, a mosaicking approach is applied to produce a homogeneous national-scale deformation map.…”

Section: Bodenbewegungsdienst Deutschland-germanymentioning

confidence: 99%

The Evolution of Wide-Area DInSAR: From Regional and National Services to the European Ground Motion Service

et al. 2020

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This study is focused on wide-area deformation monitoring initiatives based on the differential interferometric SAR technique (DInSAR). In particular, it addresses the use of advanced DInSAR (A-DInSAR) techniques, which are based on large sets of synthetic aperture radar (SAR) and Copernicus Sentinel-1 images. Such techniques have undergone a dramatic development in the last twenty years: they are now capable to process big sets of SAR images and can be exploited to realize a wide-area A-DInSAR monitoring. The study describes several initiatives to establish wide-area ground motion services (GMS), both at county- and region-level. In the second part of the study, some of the key technical aspects related to wide-area A-DInSAR monitoring are discussed. Finally, the last part of the study is devoted to the European ground motion service (EGMS), which is part of the Copernicus land monitoring service. It represents the most important wide-area A-DInSAR deformation monitoring system ever developed. The study describes its main characteristics and its main products. The end of the production of the first EGMS baseline product is foreseen for the last quarter of 2021.

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Methodology of a Troposphere Effect Mitigation Processor for SAR Interferometry

Cited by 9 publications

References 46 publications

The Extended Timing Annotation Dataset for Sentinel-1—Product Description and First Evaluation Results

The Extended Timing Annotation Dataset for Sentinel-1—Product Description and First Evaluation Results

Landslide activity detection based on Sentinel-1 PSI datasets of the Ground Motion Service Germany—the Trittenheim case study

The Evolution of Wide-Area DInSAR: From Regional and National Services to the European Ground Motion Service

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