The vortex electromagnetic (EM) wave’s orbital angular momentum (OAM) enables beam to provide more target information, providing an extra dimension in resolution for the radar. However, different from the OAM-based communication system, the echo of OAM radar is still a plane wave, which makes the OAM radar system lack natural anti-jamming ability. In order to enhance the electronic countermeasure capability of OAM radar, this letter introduces frequency agile signals into OAM radar to increase the difficulty of jamming and detection of radar signals by jammers. The compressed sensing algorithm is used to solve the problem that OAM radar cannot directly obtain target azimuth information through Fourier transform in the OAM mode domain after introducing frequency agile signals. The simulation results demonstrate that the proposed scheme effectively improves the anti-jamming performance of the OAM radar imaging system.
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Luo et al. (2024) studied this question.
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