Abstract
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 language | Chinese (Simplified) |
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Pages (from-to) | 1715-1724 |
Number of pages | 10 |
Journal | Acta Geophysica Sinica |
Volume | 52 |
Issue number | 7 |
DOIs | |
Publication status | Published - 1 Jan 2009 |
Keywords
- Bam earthquake
- Coherence
- Deformation gradient
- Envisat ASAR sensor
- Interferometric synthetic aperture radar (InSAR)
- The look number
ASJC Scopus subject areas
- Geophysics
- Geochemistry and Petrology