Localization Performance of Multiple Scatterers in Compressive Sampling SAR Tomography: Results on COSMO-SkyMed Data

The 3-D SAR tomographic technique based on compressive sampling (CS) has been proven very performing in recovering the 3-D reflectivity function and hence in estimating multiple scatterers lying in the same range-azimuth resolution cell, but at different elevations. In this paper, a detection method for multiple scatterers, assuming the number of scatterers to be known or preliminarily estimated, has been investigated. The performance of CS processing for identifying and locating multiple scatterers has been analyzed for different number of measurements and different reciprocal distances between the scatterers, in presence of the off-grid effect, and in the case of super-resolution imaging. The proposed method has been tested on simulated and real COSMO-SkyMed data.