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SAR interferometry and its applications
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DOI：10.1023/A:1006710731155.png)
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摘要
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Satellite mounted Synthetic Aperture Radars (SAR) provide information of the amplitude of the backscatterer its phase. This corresponds to the total travel time (source receiver and back), plus the phase of the scatterer itself. SAR interferometry yields the image of the differences of the phases taken in two successive passes, or in the same pass if two receivers are available on board; these images give a good Digital Elevation Model of the terrain, with a vertical resolution that could be in the meter range. Millimetric motion of large areas of the terrain or of corner reflectors can also be measured with good reliability; the system then measures subsidence, co-seismic motions and small motions of buildings and constructions. The coherence of t e interferometric pair, i.e., the permanence of the scattering characteristics of the terrain from one pass to the next combined with the more usual backscatterer amplitude, leads to high quality image segmentation. The possibilities and the limits of this technique are summarized.
Keyword:
RADAR INTERFEROMETRY
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