Efficient Approach for Atmospheric Phase Screen Mitigation in Time Series of Terrestrial Radar Interferometry Data Applied to Measure Glacier Velocity
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Author / Producer
Date
2021
Publication Type
Journal Article
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yes
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Abstract
The accuracy of surface displacements measured by differential radar interferometry is significantly degraded by the atmospheric phase screen (APS). This article presents a practical and efficient approach for APS mitigation based on the coherent pixels technique (CPT) displacement velocity estimation algorithm. In the proposed approach, all motionless coherent pixels closest to the moving area are defined as seeds surrounding the moving area at the integration step of the CPT. This arrangement consequently minimizes the integration path and the APS effect in the final velocity result. It is designed for terrestrial radar interferometry (TRI) applications. A piecewise processing chain is further introduced as a continuous operational mode processing framework to derive arbitrary temporal displacement patterns in this work. Three-day datasets measured by Ku-band TRI over a mountainous region in the canton of Valais, Switzerland, were used for validation. Through this validation, a comparative study of five algorithms was carried out. This evaluation showed the efficiency of the proposed approach. The proposed approach does not require phase unwrapping, kriging interpolation, and spatio-temporal covariance inference for APS mitigation, which is appropriate for continuous TRI operation.
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published
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Book title
Volume
14
Pages / Article No.
7734 - 7750
Publisher
IEEE
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Methods
Software
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Date collected
Date created
Subject
Atmospheric phase screen (APS); glacier; ground-based radar interferometry; radar interferometry; terrestrial radar interferometry
Organisational unit
03849 - Hajnsek, Irena / Hajnsek, Irena
08704 - SAR Remote Sensing Technology / SAR Remote Sensing Technology