Sentinel-1A Product Geolocation Accuracy: Commissioning Phase Results

Schubert, Adrian; Small, David; Miranda, Nuno; Geudtner, Dirk; Meier, Erich

doi:10.3390/rs70709431

Cited by 85 publications

(78 citation statements)

References 12 publications

(17 reference statements)

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“…2017, 9, 607 2 of 16 has been shown to be much improved [7][8][9]. The improved orbit state vector quality is reflected in the small residual baseline fringes in interferograms [10].…”

Section: Swiss Test Sitesmentioning

confidence: 98%

Sentinel-1A/B Combined Product Geolocation Accuracy

et al. 2017

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Sentinel-1A and -1B are twin spaceborne synthetic aperture radar (SAR) sensors developed and operated by the European Space Agency under the auspices of the Copernicus Earth observation programme. Launched in April 2014 and April 2016, Sentinel-1A and -1B are currently operating in tandem, in a common orbital configuration to provide an increased revisit frequency. In-orbit commissioning was completed for each unit within months of their respective launches, and level-1 SAR products generated by the operational SAR processor have been geometrically calibrated. In order to compare and monitor the geometric characteristics of the level-1 products from both units, as well as to investigate potential improvements, products from both satellites have been monitored since their respective commissioning phases. In this study, we present geolocation accuracy estimates for both Sentinel-1 units based on the time series of level-1 products collected thus far. While both units were demonstrated to be performing consistently, and providing SAR data products according to the nominal product specifications, a subtle beam-and mode-dependent azimuth bias common to the data from both units was identified. A method for removing the bias is proposed, and the corresponding improvement to the geometric accuracies is demonstrated and quantified.

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“…2017, 9, 607 2 of 16 has been shown to be much improved [7][8][9]. The improved orbit state vector quality is reflected in the small residual baseline fringes in interferograms [10].…”

Section: Swiss Test Sitesmentioning

confidence: 98%

Sentinel-1A/B Combined Product Geolocation Accuracy

et al. 2017

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“…As the annotated azimuth timestamps are related to the Zero-Doppler plane, an additional range-dependent offset is taken into account for deriving the azimuth offset. This bistatic correction considers the additional range shift of point target positions from the mid-range sample as described by [16] for StripMap mode; for the TOPS modes, the mid-range time of the related sub-swath is used.…”

Section: The Pixel Localization Accuracy In Azimuthmentioning

confidence: 99%

Independent System Calibration of Sentinel-1B

et al. 2017

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Sentinel-1B is the second of two C-Band Synthetic Aperture Radar (SAR) satellites of the Sentinel-1 mission, launched in April 2016-two years after the launch of the first satellite, Sentinel-1A. In addition to the commissioning of Sentinel-1B executed by the European Space Agency (ESA), an independent system calibration was performed by the German Aerospace Center (DLR) on behalf of ESA. Based on an efficient calibration strategy and the different calibration procedures already developed and applied for Sentinel-1A, extensive measurement campaigns were executed by initializing and aligning DLR's reference targets deployed on the ground. This paper describes the different activities performed by DLR during the Sentinel-1B commissioning phase and presents the results derived from the analysis and the evaluation of a multitude of data takes and measurements.

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“…Each pixel was geolocated using a range-Doppler algorithm that uses the restituted orbit state vectors from the product header and topographic heights from the SRTM DEM, with the height corrections applied. The geolocation accuracy of Sentinel-1 data is of the order of only a few metres (Schubert et al, 2015) which is much less than the pixel size of ~90 m. Therefore, no additional ground control was used for geolocation.…”

Section: Isbas Processing and Phase Unwrappingmentioning

confidence: 99%

Mexico City land subsidence in 2014–2015 with Sentinel-1 IW TOPS: Results using the Intermittent SBAS (ISBAS) technique

Sowter

Amat

Cigna

et al. 2016

International Journal of Applied Earth Observation and Geoinfor

130

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Differential Interferometric Synthetic Aperture Radar (DInSAR) can be considered as an efficient and cost effective technique for monitoring land subsidence due to its large spatial coverage and high accuracy provided. The recent commissioning of the first Sentinel-1 satellite offers improved support to operational surveys using DInSAR due to regular observations from a wide-area product. In this paper we show the results of an intermittent small-baseline subset (ISBAS) time-series analysis of 18 Interferometric Wide swath (IW) products of a 39,000 km 2 area of Mexico acquired between 3 October 2014 and 7 May 2015 using the Terrain Observation with Progressive Scans in azimuth (TOPS) imaging mode. The ISBAS processing was based upon the analysis of 143 small-baseline differential interferograms. After the debursting, merging and deramping steps necessary to process Sentinel-1 IW products, the method followed a standard approach to the DInSAR analysis. The Sentinel-1 ISBAS results confirm the magnitude and extent of the deformation that was observed in Mexico City, Chalco, Ciudad Nezahualcóyotl and Iztapalapa by other C-band and L-band DInSAR studies during the 1990s and 2000s. Subsidence velocities from the Sentinel-1 analysis are, in places, in excess of -24 cm/year along the satellite line-ofsight, equivalent to over ~-40 cm/year vertical rates. This paper demonstrates the potential of Sentinel-1 IW TOPS imagery to support wide-area DInSAR surveys over what is a very large and diverse area in terms of land cover and topography.

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Sentinel-1A Product Geolocation Accuracy: Commissioning Phase Results

Cited by 85 publications

References 12 publications

Sentinel-1A/B Combined Product Geolocation Accuracy

Sentinel-1A/B Combined Product Geolocation Accuracy

Independent System Calibration of Sentinel-1B

Mexico City land subsidence in 2014–2015 with Sentinel-1 IW TOPS: Results using the Intermittent SBAS (ISBAS) technique

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