Abstract
Frequency diversity array (FDA) has been widely studied due to its nature of range-angle-dependent. However, the basic FDA generates an S-shaped range-angle coupled beampattern, which limits its application in target detection and localization. Recently, the FDA with sinusoidal frequency offset (Sin-FDA) has been proposed, which provides a narrow pencil beampattern, but at the cost of high sidelobes. In this letter, the FDA with modified sinusoidal frequency offset (MSin-FDA) is proposed. In MSin-FDA, the frequency offset of Msin-FDA can be flexibly adjusted by introducing extra configuration parameters. In addition, we use genetic algorithm to optimize the configuration parameters so as to obtain an enhanced beampattern. Simulation results demonstrate that, compared with the existing FDA schemes with nonuniform frequency offset, the proposed method has better spatial focusing, sidelobe suppression, and array resolution performance under the same total frequency offset.
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