Independent Verification of the Sentinel-1A System Calibration

Schwerdt, Marco; Schmidt, Kersten; Ramon, Núria Tous; Alfonzo, Gabriel Castellanos; Döring, Björn; Zink, Manfred; Prats-Iraola, Pau

doi:10.1109/jstars.2015.2449239

Cited by 42 publications

(40 citation statements)

References 12 publications

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“…The Sentinel-1B instrument is very stable, similar to that of Sentinel-1A [3]. Irrespective of the imaging mode, transmit and receive polarizations, it can be observed that the instrument behaves very stably even for long data acquisition periods of about 25 min.…”

Section: Discussionmentioning

confidence: 79%

“…The same degradation effects were already observed for Sentinel-1A and therefore, dedicated correction algorithms were developed and implemented to guarantee the instrument stability. Sentinel-1A leakage suppression results are given in [3].…”

Section: Internal Calibrationmentioning

confidence: 99%

“…These harmonics of the system clock overlap with the nominal signal in the Analog-to-Digital Converter (ADC). Noise pulses are used for the identification and extraction of the spurious signals, allowing their suppression from the raw data, see [3] for details on the analysis with Sentinel-1A data.…”

Section: Internal Calibrationmentioning

confidence: 99%

“…The latter is mainly induced by the tropospheric refraction along the hydrostatic path and corrected as described in [3].…”

Section: The Pixel Localization Accuracy In Rangementioning

confidence: 99%

“…Unlike for the pointing determination using notch-patterns, for antenna pattern verification, the nominal antenna beams and excitation coefficients are applied. The strategy presented here has already been successfully used for the satellites TerraSAR-X [17], TanDEM-X [18] and Sentinel-1A [3].…”

Section: In-flight Antenna Model Verificationmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 79%

Section: Internal Calibrationmentioning

confidence: 99%

Section: Internal Calibrationmentioning

confidence: 99%

“…The latter is mainly induced by the tropospheric refraction along the hydrostatic path and corrected as described in [3].…”

Section: The Pixel Localization Accuracy In Rangementioning

confidence: 99%