Paper Info
Title
An Improvement of Ionospheric Phase Correction by Multiple-Aperture Interferometry
Abstract
Recently a multiple-aperture interferometry (MAI)-based azimuth shift method has been proposed to correct the ionospheric phase on synthetic aperture radar (SAR) interferograms. This method needs to determine integral constants required for azimuth integration. The exact estimation of the integral constants plays a key role in this MAI-based method. In this paper, we propose an efficient method for improving the performance of integral constant estimation, which functions by simultaneously removing the ionospheric and orbital phase artifacts from the interferometric SAR interferogram. We validate the performance improvement of the proposed method using two Advanced Land Observation Satellite Phase Array L-band SAR (ALOS PALSAR) interferometric pairs. The proposed method is compared with a MAI-based method, which does not work well due to azimuth integration errors. The proposed method successfully corrects the ionospheric and orbital phase artifacts. In addition, we compare the performances of the previous and proposed methods using the in situ Global Positioning System velocities. The root-mean-square error (RMSE) in line-of sight velocity from the previous method is about 7.0 mm/yr, whereas the RMSE from the proposed method is about 4.3 mm/yr. An RMSE reduction of about 38.6% is achieved when using the proposed method. These results indicate: 1) that the proposed method successfully estimates and corrects the ionosphere and orbital phase distortions; and 2) that the proposed method is superior to the previous method.
Year
DOI
Venue
2015
10.1109/TGRS.2015.2413948
Geoscience and Remote Sensing, IEEE Transactions  
Keywords
Field
DocType
advanced land observation satellite (alos) phase array l-band sar (palsar),sar interferometry (insar),ionospheric phase correction,multiple-aperture interferometry (mai),orbital phase correction,synthetic aperture radar (sar)
Aperture synthesis,Radar imaging,Interferometric synthetic aperture radar,Synthetic aperture radar,Side looking airborne radar,Remote sensing,Azimuth,Interferometry,Inverse synthetic aperture radar,Mathematics
Journal
Volume
Issue
ISSN
PP
99
0196-2892
Citations 
PageRank 
References 
5
0.53
12
Authors
2
Name
Order
Citations
PageRank
Hyung-Sup Jung18716.60
Won-Jin Lee271.93