Improving Burst Alignment in TOPS Interferometry With Bivariate Enhanced Spectral Diversity

TitleImproving Burst Alignment in TOPS Interferometry With Bivariate Enhanced Spectral Diversity
Publication TypeJournal Article
Year of Publication2017
AuthorsWang K., Xu X.H, Fialko Y
JournalIeee Geoscience and Remote Sensing Letters
Volume14
Pagination2423-2427
Date Published2017/12
Type of ArticleArticle
ISBN Number1545-598X
Accession NumberWOS:000418116500051
Keywordsaperture radar (SAR); Burst alignment; deformation; earthquake; enhanced spectral diversity (ESD); ionospheric delays; Sentinel-1; sentinel-1 tops; terrain observation by progressive scans (TOPS) synthetic
Abstract

Terrain observation by progressive scans (TOPS)mode synthetic aperture radar interferometry requires high accuracy of burst alignments. Geometrical burst alignment relying on precise orbits and digital topography is not always sufficient for Sentinel-1A TOPS-mode interferometry. Enhanced spectral diversity (ESD) method was proposed to estimate a constant azimuth shift between radar images that minimizes phase discontinuities across the bursts. In some cases, however, the ESD refinement fails to align the bursts in Sentinel-1 interferograms, possibly because of ionospheric propagation effects. Here, we show that in such cases, a bivariate shift (that depends on both azimuth and range) can efficiently remove phase discontinuities across the bursts. The bivariate shift can be derived from the double-differenced radar phase in the burst overlap regions.

DOI10.1109/lgrs.2017.2767575
Short TitleIEEE Geosci. Remote Sens. Lett.
Student Publication: 
No