Atmospheric Phase Compensation in Extreme Weather Conditions for Ground-Based SAR

Amila Karunathilake, Motoyuki Sato

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Herein, a semiempirical model is proposed to remove the atmospheric phase screen (APS) that occurs during ground-based synthetic aperture radar (GB-SAR) monitoring in steep mountainous areas with extreme weather conditions. The proposed method is based on a model-based statistical technique, which combines the topographical information and the estimated phase of interferograms. A 3-D geographical model was designed to investigate the effect of topographical irregularities, such as elevation, slope, and their correlation with the APS. The observed phases were then modeled according to the altitude and range of the 3-D topographical structure seen by the radar. A two-stage semiempirical algorithm is proposed to compensate for the APS in the spatial domain. Herein, the temporal changes in meteorological parameters, such as the atmospheric temperature, pressure, or humidity, were not considered for phase correction, drastically reducing the model background information and providing faster data processing for real-time GB-SAR monitoring. The proposed model was applied to the mountainous environment of a road reconstruction site in Minami-Aso, Kumamoto, Japan, where large-scale landslides were triggered after the Kumamoto earthquake in April 2016.

Original languageEnglish
Article number9123595
Pages (from-to)3806-3815
Number of pages10
JournalIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Volume13
DOIs
Publication statusPublished - 2020

Keywords

  • Displacement measurement
  • interferometry
  • radar
  • remote sensing

ASJC Scopus subject areas

  • Computers in Earth Sciences
  • Atmospheric Science

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