A study on the maximum and minimum detectable deformation gradients resolved by InSAR

Mi Jiang, Zhi Wei Li, Xiaoli Ding, Jian Jun Zhu, Guang Cai Feng, Hong Jie Yin

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)


The phase noise in a SAR interferogram is the function of both interferometric coherence and multilook number. In InSAR, except the hardware limitation, the maximum and minimum detectable deformation gradients are directly affected by interferometric phase noise. In addition, multilook operation will alter the size of pixels and thus the maximum and minimum detectable deformation gradients. This paper investigates the relationship among the maximum/minimum detectable deformation gradient, the multilook number and the coherence, and establishes the empirical function models of the maximum/minimum detectable deformation gradients for multilook number 1, 5 and 20. Experimental results with Envisat ASAR data over the area of Bam, Iran show that the new models can accurately judge whether a given ground deformation can be resolved by InSAR. Comparing with the model incorporating only coherence information, the new model is more accurate and comprehensive.
Original languageChinese (Simplified)
Pages (from-to)1715-1724
Number of pages10
JournalActa Geophysica Sinica
Issue number7
Publication statusPublished - 1 Jan 2009


  • Bam earthquake
  • Coherence
  • Deformation gradient
  • Envisat ASAR sensor
  • Interferometric synthetic aperture radar (InSAR)
  • The look number

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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