A Systematic Comparison of Near-Field Beamforming and Fourier-Based Backward-Wave Holographic Imaging

authored by

Sebastian Paul, Fabian Schwartau, Markus Krueckemeier, Reinhard Caspary, Carsten Monka-Ewe, Joerg Schoebel, Wolfgang Kowalsky

Abstract

In this paper we show the equivalence of near-field beamforming and backward-wave reconstruction algorithm. The proof is carried out analytically with two different approaches, using the principle of stationary phase from a signal processing point of view and the angular spectrum representation as an electromagnetic point of view. A comparison of the time complexity of the near-field beamforming and backward-wave reconstruction algorithm is given. A detailed discussion of the constraints required for a digital implementation is presented, leading to limitations for the chosen system parameters, especially for the backward-wave reconstruction approach. An exemplarily scenario is simulated and processed, confirming the found equivalence between the two very different approaches of image reconstruction. An additional measurement with a 120 GHz radar showcases the capabilities of both algorithms and validates our findings.

Organisation(s)

PhoenixD: Photonics, Optics, and Engineering - Innovation Across Disciplines

External Organisation(s)

Technische Universität Braunschweig

Type

Article

Journal

IEEE Open Journal of Antennas and Propagation

Volume

2

Pages

921-931

No. of pages

11

Publication date

24.08.2021

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Electrical and Electronic Engineering

Electronic version(s)

https://doi.org/10.1109/OJAP.2021.3107444 (Access: Open)