Anisotropic model-based SAR processing

Chad Knight, Jake Gunther, Todd Moon, Kenneth I. Ranney, Armin Doerry
2013 Radar Sensor Technology XVII  
Synthetic aperture radar (SAR) collections that integrate over a wide range of aspect angles hold the potentional for improved resolution and fosters improved scene interpretability and target detection. However, in practice it is difficult to realize the potential due to the anisotropic scattering of objects in the scene. The radar cross section (RCS) of most objects changes as a function of aspect angle. The isotropic assumption is tacitly made for most common image formation algorithms
more » ... on algorithms (IFA). For wide aspect scenarios one way to account for anistropy would be to employ a piecewise linear model. This paper focuses on such a model but it incorporates aspect and spatial magnitude filters in the image formation process. This is advantageous when prior knowledge is available regarding the desired targets' RCS signature spatially and in aspect. The appropriate filters can be incorporated into the image formation processing so that specific targets are emphasized while other targets are suppressed. This is demonstrated on the Air Force Research Laboratory (AFRL) GOTCHA 1 data set to demonstrate the utility of the proposed approach. Downloaded From: http://proceedings.spiedigitallibrary.org/ on 04/29/2015 Terms of Use: http://spiedl.org/terms Proc. of SPIE Vol. 8714 87141M-4 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 04/29/2015 Terms of Use: http://spiedl.org/terms Proc. of SPIE Vol. 8714 87141M-8 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 04/29/2015 Terms of Use: http://spiedl.org/terms
doi:10.1117/12.2018585 fatcat:hftwusunfvcj7e762u4kn6ebfa