A Novel Method for High Resolution RADAR Imaging by Orbital Angular Momentum Interferometry
Conference: EUSAR 2022 - 14th European Conference on Synthetic Aperture Radar
07/25/2022 - 07/27/2022 at Leipzig, Germany
Proceedings: EUSAR 2022
Pages: 6Language: englishTyp: PDF
Authors:
Biondi, Filippo (University of L’Aquila, Monteluco di Roio, L’Aquila AQ, Italy)
Fiscante, Nicomino (Università degli Studi ROMA TRE, Rome, Italy)
Addabbo, Pia (Università degli Studi “Giustino Fortunato”, Benevento, Italy)
Clemente, Carmine (University of Strathclyde, Department of Electronic and Electrical Engineering, Glasgow, UK)
Orlando, Danilo (Università degli Studi ”Niccolò Cusano“, Engineering Faculty, Roma, Italy)
Tamburini, Fabrizio (ZKM Karlsruhe, Karlsruhe, Germany)
Abstract:
The aim of this work is to give a proof of concept for high-resolution radar imaging using the Orbital Angular Momentum (OAM) communication channel for designing static, i.e. non-moving, electromagnetic sensors. To achieve this goal we design an interferometic imaging system constituted by two fixed sources separated by a given spatial baseline and used for range-azimuth synthesis. Here we also present the design of a planar vortex antenna, tailored for radar imaging application, transmitting ”ad-hoc“ structured wave packets using an incremental stepped chirp strategy and with single-mode OAM linearly incremented modulation. In order to test the imaging performance we assign the resolutions of each range-azimuth dimension to the OAM bandwidth used to synthesize the phase ripple. Moreover we develop a novel method for the synthesis of multi-modal transmissions by integrating several single-modes OAM transmissions. The OAM raw data are focused through fast-Fourier transform (FFT), and range-azimuth radar spatial resolutions depend on the OAM value and the stepped frequency chirp bandwidths.