Abstract
The scatterings of many targets are aspect dependent, which is called anisotropy. Multi-angular synthetic aperture radar (SAR) is a suitable means of detecting this kind of anisotropic scattering behavior by viewing targets from different aspect angles. First, the statistical properties of anisotropic and isotropic scatterings are studied in this paper. X-band chamber circular SAR data are used. The result shows that isotropic scatterings have stable distributions in different aspect viewing angles while the distributions of anisotropic scatterings are various. Then the statistical properties of single polarization high-resolution multi-angular SAR images are modeled by different distributions. G 0 distribution performs best in all types of areas. An anisotropic scattering analysis method based on the multi-angular statistical properties is proposed. A likelihood ratio test based on G 0 distribution is used to measure the anisotropy. Anisotropic scatterings can be discriminated from isotropic scatterings by thresholding. Besides, the scattering direction can also be estimated by our method. AHH polarization C-band circular SAR data are used to validate our method. The result of using G 0 distribution is compared with the result of using Rayleigh distribution. The result of using G 0 distribution is the better one.
Highlights
The scattering characteristic of the target is very important because it can be used for target detection, discrimination and classification
An anisotropic scattering analysis method based on the multi-angular statistical properties is proposed in this paper
Rayleigh distribution is the scalar version of the original method proposed by Ferro-Famil et al The result of using G0 distribution is much better than using Rayleigh distribution
Summary
The scattering characteristic of the target is very important because it can be used for target detection, discrimination and classification. With a common antenna aperture size, conventional synthetic aperture radar (SAR) working modes can obtain the scattering of the target within a few degrees due to the limited synthetic aperture length [1,2,3]. There are methods to detect the anisotropic scattering behavior using conventional SAR working modes [4,5]. Multi-angular SAR is a new SAR working mode [6,7,8]. It can obtain more complete scattering information by viewing the target under different aspect angles, so it is a suitable way to detect the anisotropic scattering behavior
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