What is the difference between the PS Technique and traditional differential SAR interferometric techniques?
The PS Technique allows overcoming some defects of the traditional interferometric techniques. First of all, it produces estimates of displacement more precise than the traditional techniques. Moreover traditional interferometry suffers from various problems: temporal decorrelation, geometric decorrelation, atmospheric influence. The PS Technique removes atmospheric effects from the estimation of movements using long time series of SAR images. Temporal and geometric decorrelation are reduced by choosing objects with point-wise behavior, that is with reflectivity stable in time and at varying acquisition geometries. Conventional differential interferometry can be applied only with very small (< 200 meters) normal baselines and on any number of images (? 2). The PS Technique requires at least 15-20 images but baselines even higher than the critical one can be used.
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