Microwave Photonic Direction-Finding Spectrometer
Date
2023-05-15
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Lightwave Technology
Abstract
In this paper, we propose an architecture wherein the radio-frequency (RF) field at the antenna array is up-converted to an optical carrier and passed through an array of optical fibers, after which an analog Fourier transform is taken in a free-space optical processor. Through the use of multiple temporal dispersion projections, implemented through varied-length optical fiber segments, the locations of RF sources in three-dimensional space spanning angle-of-arrival (AoA) and instantaneous frequency may be determined on a millisecond time scale using commercial computing hardware after detection by a charge-coupled device (CCD) camera. We present a mathematical formulation of the problem, followed by simulated and experimental results showing three-dimensional spatial-spectral localization through the solution to a system of equations brought forth through the use of Fourier optics to process the RF field.
Description
This article was originally published in Journal of Lightwave Technology. The version of record is available at: https://doi.org/10.1109/JLT.2023.3242627
Keywords
optical signal processing, microwave photonics, millimeter wave communication, multispectral imaging, spatial diversity
Citation
W. L. Beardell, C. J. Ryan, G. J. Schneider, J. Murakowski and D. W. Prather, "Microwave Photonic Direction-Finding Spectrometer," in Journal of Lightwave Technology, vol. 41, no. 10, pp. 3057-3064, 15 May, 2023, doi: 10.1109/JLT.2023.3242627.