Process for radar measurements of the movement of city areas and landsliding zones

Procedure for radar measurements of movements in urban areas and areas landslide, taking N> 20 images available through a radar synthetic or SAR opener over a period of several years, it identifies for each resolution cell, the scatterers whose electromagnetic characteristics remain unaltered over time, and are called Dispersing permanent or PS, characterized in that said PS are identified through the following steps: (a) forming N-1 differential interferograms with respect to the main image, called master using a digital elevation model or DEM, which has a vertical accuracy better than 50 meters; (B) generating a time series of the interferometric phases (127, 116-118), for each pixel (112- 115) of the image of step (a) chosen according statistics module properties reflectivity, and then obtain differences between time series that belong to neighboring pixels; (C) calculating the linear phase components for each differential time series of step (b) with respect to the baseline, and the phase components associated with the model constant speed subsidence, already known, with respect to time; (D) associating the relative error between the precise elevation of the pixel supplied by the DEM from step (a) with the linear phase component of step (c) with respect to the baseline; (E) associating the relative movement of the pixel in the direction of the SAR to the polynomial phase variation with time of step (c); (F) obtaining the phase residuals by subtracting the contributions calculated at steps (d) and (e) after a phase unwrapping procedure on the sparse mesh formed by the previously selected pixels; and (g) analyzing the power spectral density of the phase residuals.