Sentinel-1 system overview and performance

Geudtner, Dirk; Torres, Ramón

doi:10.1109/igarss.2012.6351191

Cited by 22 publications

(14 citation statements)

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“…Both provide SM retrievals for the top 5 cm of the soil column, with spatial resolution of ~40 km and revisit time of 2–3 days. Surface SM is also measured globally with monostatic radar: a single antenna transmits and then receives a backscattered signal, for example, using Advanced Scatterometer (Naeimi et al, ) or Sentinel‐1 data (Geudtner & Torres, ), both at C‐band. Passive and active measurements are complementary; data assimilation that incorporates both types of measurements provides the best results (Draper et al, ; Lievens et al, ).…”

Section: Introductionmentioning

confidence: 99%

Soil Moisture Sensing Using Spaceborne GNSS Reflections: Comparison of CYGNSS Reflectivity to SMAP Soil Moisture

Chew

Small

2018

Geophysical Research Letters

258

168

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Section: Introductionmentioning

confidence: 99%

Soil Moisture Sensing Using Spaceborne GNSS Reflections: Comparison of CYGNSS Reflectivity to SMAP Soil Moisture

Chew

Small

2018

Geophysical Research Letters

258

168

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“…Both satellite units, Sentinel-1A (S-1A) and Sentinel-1B (S-1B), fly in a quasi-polar, sun-synchronised (dawn-dusk) orbit at 693 km altitude, and in the same orbital plane 180 • out of phase with each other [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…The S-1 Mission has been specifically designed by the European Space Agency (ESA) to systematically acquire data and information products for Copernicus ocean, land and emergency services, as well as to national user services [1,2].…”

Section: Introductionmentioning

confidence: 99%

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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“…In this framework, the Sentinel-1 mission opened new avenues for land cover classification using time-series data. It comprises two satellites (Sentinel-1a and Sentinel-1b), which allow for a short revisit-time (12 or 6 days if one single or both satellites are considered, respectively) and it typically acquires large swaths of about 260 km in range using the interferometric wide-swath (IW) mode at C band [14].…”

Section: Introductionmentioning

confidence: 99%