InSAR datum connection using GNSS-augmented radar transponders
Pooja Mahapatra (TU Delft - Mathematical Geodesy and Positioning)
H. van der Marel (TU Delft - Mathematical Geodesy and Positioning)
F.J. van Leijen (TU Delft - Mathematical Geodesy and Positioning)
Sami Samiei-Esfahany (TU Delft - Mathematical Geodesy and Positioning)
R. Klees (TU Delft - Physical and Space Geodesy)
R.F. Hanssen (TU Delft - Mathematical Geodesy and Positioning)
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Abstract
Deformation estimates from Interferometric Synthetic
Aperture Radar (InSAR) are relative: they form a ‘free’
network referred to an arbitrary datum, e.g. by assuming a reference
point in the image to be stable. However, some applications
require ‘absolute’ InSAR estimates, i.e. expressed in
a well-defined terrestrial reference frame, e.g. to compare
InSAR results with those of other techniques. We propose a
methodology based on collocated InSAR and Global Navigation
Satellite System (GNSS) measurements, achieved by
rigidly attaching phase-stable millimetre-precision compact
active radar transponders to GNSS antennas. We demonstrate
this concept through a simulated example and practical case
studies in the Netherlands
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