Performance of 3-D Surface Deformation Estimation for Simultaneous Squinted SAR Acquisitions

Pau Prats-Iraola, Paco Lopez-Dekker, Francesco De Zan, Nestor Yague-Martinez, Mariantonietta Zonno, Marc Rodriguez-Cassola

Research output: Contribution to journalArticleScientificpeer-review

17 Citations (Scopus)
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This paper addresses the performance in the retrieval of 3-D mean deformation maps by exploiting simultaneous or quasi-simultaneous squinted synthetic aperture radar (SAR) interferometric acquisitions in a repeat-pass scenario. In multisatellite or multibeam low earth observation missions, the availability of two (or more) lines of sight (LOSs) allows the simultaneous acquisition of SAR images with different squint angles, hence improving the sensitivity to the north-south component of the deformation. Due to the simultaneity of the acquisitions, the troposphere will be highly correlated and, therefore, will tend to cancel out when performing the differential measurement between the interferograms obtained with the different LOSs, hence resulting in a practically troposphere-free estimation of the along-track deformation measurement. In practice, however, the atmospheric noise in the differential measurement will increase for increasing angular separations. This paper expounds the mathematical framework to derive the performance by properly considering the correlation of the atmospheric delays between the simultaneous acquisitions. To that aim, the hybrid Cramér-Rao bound is exploited making use of the autocorrelation function of the troposphere. Some performance examples are presented in the frame of future spaceborne SAR missions at C and L band.

Original languageEnglish
Pages (from-to)2147 - 2158
Number of pages12
JournalIEEE Transactions on Geoscience and Remote Sensing
Issue number4
Publication statusPublished - 2018


  • Atmospheric boundary layer (ABL)
  • Atmospheric measurements
  • differential synthetic aperture radar interferometry (DInSAR)
  • Extraterrestrial measurements
  • Geometry
  • hybrid Cramér-Rao bound (HCRB)
  • Satellites
  • squinted synthetic aperture radar acquisitions
  • Strain
  • Synthetic aperture radar
  • synthetic aperture radar (SAR)
  • Terrestrial atmosphere
  • troposphere


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