Sparsity-aware transmit beamspace design for FDA-MIMO radar.

•We devise an FDA and MIMO hybrid radar to jointly estimate the ranges and angles of multiple targets via optimal transmit beamspace design.•A uniform elemental power constraint is adopted as the optimization criterion to minimize the mutual coherence of the sensing matrix using a sparse model.•We exploit cyclic optimization and power method-like approaches to tackle the problem.•We employ different methods to evaluate the performance for range, angle and amplitude estimation.