Feasibility of along-track displacement measurement from sentinel-1 interferometric wide-swath mode

Hyung Sup Jung, Zhong Lu, Lei Zhang

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

The European Space Agency's Sentinel-1, a C-band imaging radar mission to be launched in mid-2013, will provide a continuity of radar data for monitoring the changing Earth. The azimuth resolution of Sentinel-1's background mode, interferometric wide-swath (IW) mode, is four times lower than that of European remote-sensing satellite (ERS) and Envisat systems. Therefore, the measurement accuracy of along-track displacement from Sentinel-1 IW images presumably will be significantly reduced. In this paper, we test the feasibility of along-track displacement measurement from Sentinel-1 IW mode. We simulate Sentinel-1 IW synthetic aperture radar (SAR) images from the ERS raw data that captured the coseismic deformation of the 1999 Hector Mine earthquake in California. Along-track displacement maps are generated using multiple-aperture interferometric SAR (MAI) and intensity tracking techniques, respectively, and are compared with GPS measurements. The root-mean-square (rms) error between the synthetic Sentinel-1 MAI and GPS measurements is about 9.6 cm, which corresponds to only 0.5 % of the azimuth resolution. The rms error between the along-track displacements from synthetic Sentinel-1 offset tracking and GPS is about 27.5 cm, which is about 1.4 % of the azimuth resolution. These results suggest that the MAI method will still be useful to measure along-track displacements from Sentinel-1 IW InSAR imagery and that it would be difficult to effectively measure the along-track displacements by the Sentinel-1 offset tracking method.

Original languageEnglish
Article number6214596
Pages (from-to)573-578
Number of pages6
JournalIEEE Transactions on Geoscience and Remote Sensing
Volume51
Issue number1
DOIs
StatePublished - 2013

Keywords

  • European Remote Sensing (ERS)
  • Sentinel-1
  • interferometric synthetic aperture radar (InSAR)
  • multiple-aperture InSAR (MAI)
  • synthetic aperture radar (SAR)

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