Abstract

Earth’s topography and deformation mapping have become easier by the use of a geodetic technique popularly known as repeat-pass Synthetic Aperture Radio Detection and Ranging (SAR/RADAR) Interferometry (InSAR). However, the measurements obtained through InSAR are liable to atmospheric errors. Water vapor and clouds present in the troposphere and the Total Electron Content (TEC) of the ionosphere are responsible for the additional path delay in the wave. An increase is induced in the observed range due to tropospheric refractivity and path shortenings are observed due to ionospheric electron density. The quality of phase measurement is affected by these atmospheric induced propagation delays and hence errors are introduced in the topography and deformation fields. A three-pass differential synthetic aperture radar interferometry (DInSAR) is performed from two interferograms and the effect of this atmospheric delay is studied on the same study area. The interferograms are generated from three single look complex (SLC) phased array type L-band synthetic aperture radar (PALSAR) data of advanced land observing satellite (ALOS). Atmospheric phase correction is done on the generated DInSAR and it is found that atmospheric error correction is essential in order to avoid inaccurate erratic height and deformation measurements.

Highlights

  • Synthetic aperture radar (SAR) as an extensive tool uses SAR interferometry (InSAR) which is a processing technique to measure the topography of the surface, its changes over time, and other changes in the surface

  • In SAR interferometry, the deformation signal obtained from the Earth surface is mixed with topographic signal

  • A three-pass differential synthetic aperture radar interferometry or DInSAR is used in remote sensing for measuring Earth surface deformation [1,2]

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Summary

Introduction

Synthetic aperture radar (SAR) as an extensive tool uses SAR interferometry (InSAR) which is a processing technique to measure the topography of the surface, its changes over time, and other changes in the surface. It is a technique in which two SAR images are combined to produce an interferogram. In SAR interferometry, the deformation signal obtained from the Earth surface is mixed with topographic signal To overcome this problem, a differential interferogram is used. A three-pass differential synthetic aperture radar interferometry or DInSAR is used in remote sensing for measuring Earth surface deformation [1,2].

Effects of Atmospheric Propagation
DInSAR Generation from the Two Interferograms
Phase Correction
Path Delay Occurred
DInSAR Error Map
Conclusion
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