Atmospheric effects on repeat-pass InSAR measurements over Shanghai region

Z. W. Li, Xiaoli Ding, C. Huang, Z. R. Zou, Y. L. Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

26 Citations (Scopus)

Abstract

It is well known that interferometric synthetic aperture radar (InSAR) measurements are affected by the atmosphere especially the troposphere. We use Shanghai as an example to analyze the properties of the effects based on a number of SAR interferograms over the region. First, Radon transform is used to examine the isotropic property of the effects. The results show that the effects in all the interferograms are anisotropic although they exhibit different patterns. Two different methods, the Jarque-Bera and the Hinich tests, are then applied to test the Gaussianity of atmospheric effects. Both of the tests reveal that the atmospheric effects are non-Gaussian. Finally, spectral analysis of the atmospheric effects is carried out and the results show that the power spectra of the atmospheric signatures in all the interferograms studied follow approximately the power law distribution. The scaling exponents estimated show that the atmospheric signatures in all the interferograms are non-stationary but with stationary increments. It is estimated based on the estimated scaling exponents that external data with spatial resolutions as high as about 0.3 km, are required to determine and correct for over 90% of the atmospheric effects in the SAR interferograms.
Original languageEnglish
Pages (from-to)1344-1356
Number of pages13
JournalJournal of Atmospheric and Solar-Terrestrial Physics
Volume69
Issue number12
DOIs
Publication statusPublished - 1 Aug 2007

Keywords

  • Anisotropy
  • Atmospheric effects
  • Non-Gaussian
  • Power law
  • SAR interferometry

ASJC Scopus subject areas

  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science

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