Analytic Physical Optics Solution for Bistatic, 3D Scattering From a Dihedral Corner Reflector

Abstract

We derive an analytic scattering model for 3D bistatic scattering from a dihedral using geometrical optics (GO) and physical optics (PO). We use GO to trace ray reflections, and we evaluate the PO integral(s) for the field scattered by each plate of the dihedral. Multiple cases of reflection geometry are considered to account for effects of the dihedral plate size and antenna aspect angles. The complex-valued (amplitude and phase) scattering response is derived. The resulting parametric scattering model is presented in terms of the vertical and horizontal co-polarization and cross-polarization responses that correspond to the outputs of industry-standard numerical prediction codes. Comparing the derived model to available codes for method of moments (MoM), shooting and bouncing rays (SBR), and parametric models (PM), we demonstrate that the derived solution achieves the same accuracy as SBR, approximates MoM, is more accurate than PM, and does so in fast computation time comparable to a PM.

Absorbing properties of metamaterial dihedral corner reflector

“…Figure 6 shows the 3D scattering patterns with different structures at different frequencies, which can intuitively observe the intensity of scattering from the color. The dihedral scattering responses in [21,28] and the total scattered field in [29] are given by a single transmitter that exemplifies each illumination case and a single frequency.…”

Accurate Analysis of Target Characteristic in Bistatic SAR Images: A Dihedral Corner Reflectors Case

“…In Figure 7 , we assume that the radar beam emitted by the transmitter enters the plate along the unit vector where the polarization direction is , the receiver receives the echo along the unit vector where the polarization direction is , the normal unit vector of the plate is , the incident and reflected angles are , respectively. Then, according to the physical optical approximation formula mentioned in [ 18 ], we have where , is the wave length, is the position vector of the plate centroid, is the length of the plate and is the length of the plane.…”

“…The right-angle structures are often called dihedral corners whose effects are quite common in monostatic radar sensors. There are lots of dihedral corners generated by artificial targets, such as the joints between different flat surfaces [ 18 ]. Therefore, the dihedral corners are important structures for radar target detection.…”

Polarimetric object‐level SAR imaging method with canonical scattering characterisation by exploiting joint sparsity

“…The polarimetric radar measures the backscattered electric field with dual signal transmission, which is supposed to be horizontal polarisation (H) and vertical polarisation (V), respectively [17–19]. We assume the incident and received wave direction vectors [18] are represented as and . In this paper, we adopt six main CSF models, including plate, dihedral, trihedral, cylinder, top‐hat and sphere.…”