Range Ambiguous Clutter Rank Analysis in FDA-MIMO Radar

In recent years, frequency diverse array (FDA) with multiple-input multiple-output (MIMO) technique, which is referred to as FDA-MIMO radar, has attracted extensive attentions due to its outstanding advantages of introducing additional controllable degrees-of-freedom (DOFs) in range dimension. For FDA-MIMO radar mounted on a moving platform, one big concern is clutter rank. This paper derives the analytical expression of clutter rank in FDA-MIMO radar with range ambiguity. The clutter rank is studied based on subspace transformation and the correlation of vectors in the transformed subspace is explored. Then the maximum resolvable number of range ambiguity can be determined. Simulation results have verified the effectiveness of the proposed method.