| Citation: | YUAN H，LUO Y，CHEN Y J，et al. Two-dimensional imaging algorithm for arcsine-based circular antenna array[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（6）：1487-1494 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0437
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Radar imaging technology can capture rich feature information of a target, which provides important basis for target recognition. Vortex electromagnetic wave imaging technology, a widely discussed topic, can capture high-resolution two-dimensional images of relatively stationary targets. To achieve a higher imaging quality, the azimuth resolution in radar beams is obtained using arcsine-based circular antenna array, and a two-dimensional imaging algorithm based on the arcuate ring antenna array is proposed. With only half a circular antenna array, the azimuth resolution similar to that of vortex electromagnetic wave imaging technology can be obtained, and the sidelobe height is reduced. Firstly, the one-dimensional range profile is obtained through the “Dechirp” operation. On this basis, the reference signal is constructed, the cosine function in the phase is changed into a linear function through the conjugate multiplication between the echo and the reference signal. Finally, the echo is accumulated to obtain the two-dimensional image of the target. The effects of the number of array elements and beam width on the azimuth resolution are analyzed. The effectiveness of the proposed method is verified compared with that of vortex electromagnetic wave radar imaging method.
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