Iterative Atmospheric Phase Screen Compensation for Near-Real-Time Ground-Based InSAR Measurements over a Mountainous Slope

Yuta Izumi, Lilong Zou, Kazutaka Kikuta, Motoyuki Sato

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number9013048
Pages (from-to)5955-5968
Number of pages14
JournalIEEE Transactions on Geoscience and Remote Sensing
Volume58
Issue number8
DOIs
Publication statusPublished - 2020 Aug

Keywords

  • Atmospheric phase screen (APS)
  • differential interferometry SAR (DInSAR)
  • ground-based synthetic aperture radar (Gb-SAR)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Earth and Planetary Sciences(all)

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