Abstract
A Parametric-Model-Based Approach for Atmospheric Phase Screen Removal in Ground-Based Interferometric SAR
Highlights
G ROUND Based SAR interferometry represents a valid tool for the monitoring of small area because of its short revisiting time and its zero spatial baseline [1]–[4] and has been widely used to detect and measure terrain displacement
This paper proposes the use of a parametric model of the refractive index, which preserves the physical value of the model itself
This approach make use of measured phase of the ground control points (GCPs), it is considered as a model-based approach since it still relies on the refractive index model and as a consequence it is able to preserve a physical consistency
Summary
G ROUND Based SAR interferometry represents a valid tool for the monitoring of small area because of its short revisiting time and its zero spatial baseline [1]–[4] and has been widely used to detect and measure terrain displacement. The first class of algorithms is based on the knowledge of auxiliary data, such as pressure, temperature, humidity and of a model of the refractive index to estimate the interferogram degradation due to the atmospheric effects These methods have the advantage of using a model that preserves the physical consistency of the propagation delay without altering the true terrain displacement. These methods model the atmospheric contribution spatially and estimate the model parameters using the measured interferometric phase of some selected persistent scattarers, namely those scatterer that are supposed to be stationary over time These methods are not based on any physical model of the refractive index and their effectiveness is strongly related to the way the persistent scatterers are extracted from the SAR images. As specified in [18], the expression in Eq (6) can be used for all radio frequencies
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