ANALYSIS OF SAR BACKSCATTER INTENSITY CHARACTERISTICS FOR INVERSE ESTIMATION OF EARTHQUAKE-DAMAGED BUILDINGS

SAR image simulation is a radar imaging simulation technology developed in recent years, which helps the analysis design, and verification of SAR system, assists SAR image interpretation, SAR image processing algorithm verification, and SAR image geometry correction, and thus has important theoretical significance and practical value. A 3-dimensional canonical target known as SLICY (Sandia Laboratory Implementation of Cylinders) and a collapse model are used for synthetic aperture radar imaging simulations. Reflectivity maps corresponding to signals with different types of radar backscatter are plotted. Combined with the geometrical physical information of the target, the correspondence between the point and line features, different signals of scattering, and object-specific structures in the simulated SAR images are analyzed. The results show that reflection levels of the radar signal are closely related to the object structure details. The analysis of the reflective intensity characteristics of this paper provides a good basis for later inverse estimation of damage to earthquake-damaged buildings.