Synthetic Aperture Radar Bistatic Polarimetry

BiPolSAR is a Spanish I+D+i National plan funded project aiming at developing the field of bistatic polarimetry in Synthetic Aperture Radar (SAR) through a combination of theoretical and experimental research. A bistatic SAR is a system in which the receiver and the transmitter are physically separated and in which one or both follow a known flight trajectory, which allows the use of synthetic aperture techniques. In bistatic systems, new scattering geometries appear for which the characteristics of the signal, in particular its polarimetric signature, have hardly been studied. Nevertheless, there is a lot of interest in orbital bistatic or multistatic constellations due to their potential to yield global coverage together with a high temporal resolution. In this project, it is proposed to fill the knowledge gap with regard to the bistatic following two complementary axis:

  • A rigorous theoretical analysis of the problem
  • Gathering experimental data in a configuration similar to the orbital geometries of interest

Top image: Bistatic polarimetric SAR acquisition system.

Bistatic polarimetric data acquired with the system developed in the project using the ESA ERS-2 system as an opportunity transmitter, on the mountains surrounding the city of Barcelona, close to the university campus. As ERS-2 transmits in vertical polarization, only |Svv| (left) and |Svh| (right) are measured.
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