Estimation of trihedral pose angle from virtual aperture radar image

Estimation of the pose angle of a trihedral formed by the wall-wall-floor structure is important in obtaining the interior layouts of a building. An image-domain based method is proposed to estimate the pose angle using a feature called amplitude ratio (AR) in this paper. The imaging geometry of the virtual aperture radar with a multiple-input multiple-output (MIMO) array and the definition of AR in are described at first. Secondly, a parametric back-scattering model is employed to analyze the AR in the echo-domain. Then, a virtual aperture imaging model is developed to describe the imaging procedure using MIMO array. Based on the imaging model, the AR of each trihedral in a radar image can be calculated in the image-domain instead of the echo-domain. Finally, the proposed estimation method is validated by experimental data.