Imaging Model of Wideband Vortex Electromagnetic Waves under Dispersion Effect

The phase characteristics of vortex electromagnetic waves offer significant potential for forward-looking radar imaging. Previous vortex electromagnetic wave imaging systems often used narrowband linear frequency modulation (LFM) signals to obtain range information. However, to achieve a higher range resolution, it is necessary to increase the signal bandwidth. A commonly used method for generating vortex electromagnetic waves is utilizing a uniform circular array (UCA), where each array element requires a phase shifter to apply phase shifts, producing vortex electromagnetic waves of different modes. Due to the dispersion effect, for wideband signals, the phases generated by different antenna elements at various instantaneous frequencies do not conform to the specific phase pattern required for a particular vortex electromagnetic wave mode. This discrepancy causes the traditional imaging model to be unable to accurately describe the imaging process of wideband vortex electromagnetic waves. To address this issue, this paper first derives the electromagnetic antenna pattern of wideband vortex electromagnetic waves and, based on this model, establishes a forward-imaging echo model. Finally, the proposed forward-imaging model for wideband vortex electromagnetic wave radar is validated using the least squares method.[PDF, EI]

Recommended citation:

Y. Wei, G. Shu, and N. Li, “Imaging Model of Wideband Vortex Electromagnetic Waves under Dispersion Effect,” IGARSS 2025 - 2025 IEEE International Geoscience and Remote Sensing Symposium, Brisbane, Australia, 2025, pp. 8965-8969, doi: 10.1109/IGARSS55030.2025.11242886.

bibtex:

@inproceedings{Wei2025WidebandVortexEMWaveImagingModel,
author = {Yixin Wei and Gaofeng Shu and Ning Li},
title = {Imaging Model of Wideband Vortex Electromagnetic Waves under Dispersion Effect},
volume = { },
booktitle = {IGARSS 2025 - 2025 IEEE International Geoscience and Remote Sensing Symposium},
editor = { },
pages = {8965-8969},
	address={Brisbane, Australia},
	days={3},
	month={Aug.},
year = {2025},
doi = {10.1109/IGARSS55030.2025.11242886},
}