Radar Cross Section Characterization of Corner Reflectors in Different Frequency Bands and Polarizations

Abstract

<p><strong>Abstract.</strong> Corner Reflectors (CR) are standard passive radar targets which offer one of the best solutions for SAR calibration. Radar Cross Section (RCS) of corner reflectors plays a vital role for estimation of calibration parameters and hence back scatter coefficient for airborne and spaceborne SAR images. There is a stringent requirement to characterize RCS of corner reflectors by measuring its scattering properties in a controlled environment. RCS characterization of square trihedral corner reflectors, dihedrals including polarization selective dihedrals is addressed. These measurements were carried out at X, C and S band frequencies with wide scan angles at definite sampling interval. The design details of corner reflectors, specifications of Compact Antenna Test Range Facility, technical modalities involved for RCS measurements, variation of measured RCS from theoretical value for trihedral and dihedral reflectors at different frequency bands and polarizations are presented in this paper.</p>

Absolute Calibration of a UAV-Mounted Ultra-Wideband Software-Defined Radar Using an External Target in the Near-Field

“…Most of the literature on radar calibration predominantly focuses on measuring the RCS of a passive external target in the far-field region [28][29][30][31][32]. A calibration curve is then built as a function of the incidence angle.…”

Design of Tapered Periodic Meta-Surfaces for Suppressing Edge Electromagnetic Scattering

“…Suppression of edge scattering can be achieved by various methods including shaping design, cancellation technology and tapered impedance loading. For shaping design, the use of serration edge is one of the most popular approaches, which can avoid reflection in the direction of the incoming wave so as to reduce the backscattering from the edges [9]. Cancellation technology introduces an echo source from certain part of the target whose amplitude and phase can be adjusted to cancel another source from another part of the target, and therefore decrease the total scattering field.…”

Evaluation of Calibration Using Corner Reflector with Ground-Based Interferometric Radar

“…The experiment indicates that the different levels of the RCS measurements from three types of CRs could be utilized for calibration study with fully polarimetric radar observations. 외의 높은 시간해상도를 가지는 반면 수십 km 이상의 비교 적 낮은 공간해상도 자료를 제공한다는 한계가 있다 (Kim et al, 2014) (Jayasri et al, 2018;Shin et al, 2010). 코너 리플렉터는 주로 구(sphere), 삼각 삼면체 (triangular trihedral), 사각 삼면체(square trihedral), 이 면체(dihedral)의 형태를 가지며, 다음의 식은 코너 리플렉터 의 형태에 따른 이론적인 RCS의 최대값(σ CR type )을 나타낸다 (Osman and Alzubaidi, 2014).…”