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Sensors 2018, 18(4), 1158; https://doi.org/10.3390/s18041158

A Novel Strategy of Ambiguity Correction for the Improved Faraday Rotation Estimator in Linearly Full-Polarimetric SAR Data

College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
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Received: 15 March 2018 / Revised: 6 April 2018 / Accepted: 9 April 2018 / Published: 10 April 2018
(This article belongs to the Section Remote Sensors)
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Abstract

Spaceborne synthetic aperture radar (SAR) missions operating at low frequencies, such as L-band or P-band, are significantly influenced by the ionosphere. As one of the serious ionosphere effects, Faraday rotation (FR) is a remarkable distortion source for the polarimetric SAR (PolSAR) application. Various published FR estimators along with an improved one have been introduced to solve this issue, all of which are implemented by processing a set of PolSAR real data. The improved estimator exhibits optimal robustness based on performance analysis, especially in term of the system noise. However, all published estimators, including the improved estimator, suffer from a potential FR angle (FRA) ambiguity. A novel strategy of the ambiguity correction for those FR estimators is proposed and shown as a flow process, which is divided into pixel-level and image-level correction. The former is not yet recognized and thus is considered in particular. Finally, the validation experiments show a prominent performance of the proposed strategy. View Full-Text
Keywords: synthetic aperture radar (SAR); Faraday rotation (FR); polarimetric SAR (PolSAR); FR angle (FRA) ambiguity; ambiguity correction synthetic aperture radar (SAR); Faraday rotation (FR); polarimetric SAR (PolSAR); FR angle (FRA) ambiguity; ambiguity correction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Li, J.; Ji, Y.; Zhang, Y.; Zhang, Q.; Huang, H.; Dong, Z. A Novel Strategy of Ambiguity Correction for the Improved Faraday Rotation Estimator in Linearly Full-Polarimetric SAR Data. Sensors 2018, 18, 1158.

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