Journal ArticleDOI
The Potential of Low-Frequency SAR Systems for Mapping Ionospheric TEC Distributions
TLDR
The potential of broadband L-band SAR systems for ionospheric TEC mapping is studied and it is shown that phase advance and group delay can be measured by interferometric and correlation techniques, respectively.Abstract:
Ionospheric propagation effects have a significant impact on the signal properties of low-frequency synthetic aperture radar (SAR) systems. Range delay, interferometric phase bias, range defocusing, and Faraday rotation are the most prominent ones. All the effects are a function of the so-called total electron content (TEC). Methods based on two-frequency global positioning system observations allow measuring TEC in the ionosphere with coarse spatial resolution only. In this letter, the potential of broadband L-band SAR systems for ionospheric TEC mapping is studied. As a basis, the dispersive nature of the ionosphere and its effects on broadband microwave radiation are theoretically derived and analyzed. It is shown that phase advance and group delay can be measured by interferometric and correlation techniques, respectively. The achievable accuracy suffices in mapping small-scale ionospheric TEC disturbances. A differential TEC estimator that separates ionospheric from tropospheric contributions is proposedread more
Citations
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Journal ArticleDOI
Corrections of stratified tropospheric delays in SAR interferometry: Validation with global atmospheric models
TL;DR: In this article, the authors use Global Atmospheric Models (GAM) to estimate the stratified phase delay and delay-elevation ratio at epochs of SAR acquisitions, and compare them to observed phase delay derived from SAR interferograms.
Corrections of stratified tropospheric delays in SAR interferometry: Validation with global atmospheric models
TL;DR: In this article, the authors use Global Atmospheric Models (GAM) to estimate the stratified phase delay and delay-elevation ratio at epochs of SAR acquisitions, and compare them to observed phase delay derived from SAR interferograms.
Journal ArticleDOI
TerraSAR-X SAR Processing and Products
TL;DR: The intention of this paper is to present the SAR data processing concept and the comprehensive portfolio of products reflecting the instrument's diverse imaging capabilities together with options of processing and achieved product quality as well as the essentials of SAR processing.
Journal ArticleDOI
Recent Trend and Advance of Synthetic Aperture Radar with Selected Topics
TL;DR: A short review is presented on the recent trend and development of SAR and related techniques with selected topics, including the fields of applications, specifications of airborne and spaceborne SARs, and information contents in and interpretations of amplitude data, interferometric SAR (InSar) data, and polarimetric SAR (PolSAR) data.
Journal ArticleDOI
A Review of Interferometric Synthetic Aperture RADAR (InSAR) Multi-Track Approaches for the Retrieval of Earth’s Surface Displacements
Antonio Pepe,Fabiana Calò +1 more
TL;DR: In this paper, the authors provide a general overview of the InSAR principles and the recent development of the advanced multi-track inSAR combination methodologies, which allow to discriminate the 3D components of deformation processes and to follow their temporal evolution.
References
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Journal ArticleDOI
Experimental Researches in Electricity. Nineteenth Series
TL;DR: In this paper it was shown that the relationship between light and electricity has one common origin, and that the two forces are mutually dependent and can be converted one into another, and possess equivalents of power in their action.
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Accuracy of differential shift estimation by correlation and split-bandwidth interferometry for wideband and delta-k SAR systems
Richard Bamler,Michael Eineder +1 more
TL;DR: It is shown that the performance of split-band interferometry is close to the Crame/spl acute/r-Rao bound for a broad variety of bandwidth ratios, and Delta-k systems are proposed to best take advantage of the available radar bandwidth.
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Influence of ionospheric electron density fluctuations on satellite radar interferometry
TL;DR: In this article, the effect of ionospheric electron density fluctuation on satellite radar interferometry (SRI) images was investigated and shown to be useful in mapping patterns of polar auroral zone ionosphere disturbances over large distances, which can be detected using SRI.
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Calibration of linearly polarized polarimetric SAR data subject to Faraday rotation
TL;DR: The approach described in this paper is relevant for future L-band spaceborne SARs and removes one key obstacle to the deployment of even longer wavelength SARs in Earth orbit.
Journal ArticleDOI
Measurement of ice-sheet topography using satellite-radar interferometry
TL;DR: In this article, the phase difference between pairs of synthetic aperture radar (SAR) images is used to measure both ice-sheet topography and surface displacement, and the authors applied this technique using ERS-1 SAR data to make detailed (i.e. 80 m horizontal resolution) maps of surface topography in a 100 km by 300 km strip in West Greenland.