Conventional multiple-input and multiple-output(MIMO) radar is a flexible technique which enjoys the advantagesof phased-array radar without sacrificing its mainadvantages. However, due to its range-independent directivity,MIMO radar cannot mitigate nondesirable range-dependentinterferences. In this paper, we propose a range-dependentinterference suppression approach via frequency diverse array(FDA) MIMO radar, which offers a beamforming-based solutionto suppress range-dependent interferences and thus yields muchbetter DOA estimation performance than conventional MIMOradar. More importantly, the interferences located at the sameangle but different ranges can be effectively suppressed by therange-dependent beamforming, which cannot be achieved byconventional MIMO radar. The beamforming performance ascompared to conventional MIMO radar is examined by analyzingthe signal-to-interference-plus-noise ratio (SINR). The Cramér-Rao lower bound (CRLB) is also derived. Numerical resultsshow that the proposed method can efficiently suppress range-dependentinterferences and identify range-dependent targets. It is particularly useful in suppressing the undesired stronginterferences with equal angle of the desired targets.
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