Remote Sens. 2013, 5(12), 6667-6690; doi:10.3390/rs5126667
Article

Hierarchical Bayesian Data Analysis in Radiometric SAR System Calibration: A Case Study on Transponder Calibration with RADARSAT-2 Data

Microwaves and Radar Institute, German Aerospace Center (DLR), Oberpfaffenhofen,D-82234 Weßling, Germany
* Author to whom correspondence should be addressed.
Received: 19 October 2013; in revised form: 20 November 2013 / Accepted: 28 November 2013 / Published: 4 December 2013
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Abstract: A synthetic aperture radar (SAR) system requires external absolute calibration so that radiometric measurements can be exploited in numerous scientific and commercial applications. Besides estimating a calibration factor, metrological standards also demand the derivation of a respective calibration uncertainty. This uncertainty is currently not systematically determined. Here for the first time it is proposed to use hierarchical modeling and Bayesian statistics as a consistent method for handling and analyzing the hierarchical data typically acquired during external calibration campaigns. Through the use of Markov chain Monte Carlo simulations, a joint posterior probability can be conveniently derived from measurement data despite the necessary grouping of data samples. The applicability of the method is demonstrated through a case study: The radar reflectivity of DLR’s new C-band Kalibri transponder is derived through a series of RADARSAT-2 acquisitions and a comparison with reference point targets (corner reflectors). The systematic derivation of calibration uncertainties is seen as an important step toward traceable radiometric calibration of synthetic aperture radars.
Keywords: synthetic aperture radar; radiometric calibration; external calibration; Bayesian data analysis; transponder

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MDPI and ACS Style

Döring, B.J.; Schmidt, K.; Jirousek, M.; Rudolf, D.; Reimann, J.; Raab, S.; Antony, J.W.; Schwerdt, M. Hierarchical Bayesian Data Analysis in Radiometric SAR System Calibration: A Case Study on Transponder Calibration with RADARSAT-2 Data. Remote Sens. 2013, 5, 6667-6690.

AMA Style

Döring BJ, Schmidt K, Jirousek M, Rudolf D, Reimann J, Raab S, Antony JW, Schwerdt M. Hierarchical Bayesian Data Analysis in Radiometric SAR System Calibration: A Case Study on Transponder Calibration with RADARSAT-2 Data. Remote Sensing. 2013; 5(12):6667-6690.

Chicago/Turabian Style

Döring, Björn J.; Schmidt, Kersten; Jirousek, Matthias; Rudolf, Daniel; Reimann, Jens; Raab, Sebastian; Antony, John W.; Schwerdt, Marco. 2013. "Hierarchical Bayesian Data Analysis in Radiometric SAR System Calibration: A Case Study on Transponder Calibration with RADARSAT-2 Data." Remote Sens. 5, no. 12: 6667-6690.

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