Analysis of Cantor Multistage Frequency Offset FDA-MIMO Beampattern Performance

Compared with fractal array and frequency diverse array (FDA), the Cantor FDA combines both features. In this article, we analyzed the features of Cantor FDA-multiple-input multiple-output (MIMO) beampattern, it has the properties of multifrequencies; nevertheless, it also has a grating lobe and high sidelobe levels. Then, we proposed a Cantor multistage frequency offset FDA-MIMO to improve the performance. We jointly designed the transmit-receive elements spacing, the multistage frequency offset of the array, and combined sparse constraint. We got the beampattern of no grating lobe and low sidelobe. We also analyzed the ability of interference suppression of it. The simulation results and analysis show that the Cantor multistage frequency offset FDA-MIMO has frequency and frequency offset insensitivity, excellent range-angle beampattern, and antiinterference ability.