Iterative atmospheric phase screen compensation for near-real-time ground-based InSAR measurements over a mountainous slope

Izumi, Yuta, Zou, Lilong ORCID:, Kikuta, Kazutaka and Sato, Motoyuki (2020) Iterative atmospheric phase screen compensation for near-real-time ground-based InSAR measurements over a mountainous slope. IEEE Transactions on Geoscience and Remote Sensing. ISSN 0196-2892

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In this article, an atmospheric phase screen (APS) compensation algorithm for a near real-time ground-based interferometry synthetic aperture radar (GB-InSAR) over a mountainous area is investigated. A novel APS compensation scheme is proposed to compensate the fluctuated APS caused by a spatial 3-D inhomogeneous refractivity index distribution without any a priori knowledge of moving location. The proposed method simultaneously addresses to identify moving pixels by a criterion of absolute velocity estimated by the coherent pixels technique (CPT). The proposed method consists mainly of three steps: 1) the stratified APS compensation; 2) identification of moving pixel candidate; and 3) the residual APS [remained APS after 1)] compensation by Kriging interpolation. The steps mentioned above are iteratively applied in order to increase the accuracy of the whole process. In this framework, we develop the 2-D quadratic polynomial model of the refractivity index with respect to slant range and topographic height for modeling the stratified APS. Furthermore, a prediction of the residual APS is achieved by applying the intrinsic random function of order k (IRF-k) Kriging interpolation, taking into account the nonstationarity of the residual APS. We evaluate the proposed method using zero-baseline GB-differential InSAR (GB-DInSAR) data over a mountainous area located in Minami-Aso, Kumamoto, Japan, through the near real-time post-landslide measurement campaign.

Item Type: Article
Identifier: 10.1109/tgrs.2020.2973533
Additional Information: © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Keywords: Atmospheric phase screen (APS), differential interferometry SAR (DInSAR), ground-based synthetic aperture radar (GB-SAR).
Subjects: Construction and engineering > Civil and environmental engineering
Construction and engineering > Digital signal processing
Construction and engineering > Electrical and electronic engineering
Depositing User: Lilong Zou
Date Deposited: 27 Feb 2020 15:07
Last Modified: 06 Feb 2024 16:02


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