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Frequency diverse (FD) radar waveforms are attractive in radar research andpractice. By combining two typical FD waveforms, the frequency diverse array(FDA) and the stepped-frequency (SF) pulse train, we propose a general FDwaveform model, termed the random frequency diverse multi-input-multi-output(RFD-MIMO) in this paper. The new model can be applied to specific FD waveformsby adapting parameters. Furthermore, by exploring the characteristics of theclutter covariance matrix, we provide an approach to evaluate the clutter rankof the RFD-MIMO radar, which can be adopted as a quantitive metric for theclutter suppression potentials of FD waveforms. Numerical simulations show theeffectiveness of the clutter rank estimation method, and reveal helpful resultsfor comparing the clutter suppression performance of different FD waveforms.

On Clutter Ranks of Frequency Diverse Radar Waveforms