This work is motivated by the increasing demand on anti-jamming techniques in radar systems.The current challenging issues on the anti-jamming task in conventional radar frameworks are outlined. Focused on deceptive jamming countermeasure issue

a novel framework

referred to as waveform diverse array (WDA) radar

is proposed to address the anti-jamming problem.Utilizing the additional degrees-of-freedom (DOFs) in transmit spatial frequency in frequency diverse array (FDA) multiple-input multiple-output (MIMO) radar

the true target and repeated false target can be isolated in the transmit spatial frequency domain.Moreover

this paper investigates the feasibility by using the suggested FDA-MIMO radar to suppress the deceptive jamming signals

even those from the mainlobe direction

with help of some information on true target obtained in earlier detection stage.In consideration of the random distribution of repeated false target in time domain

a jamming signal sample selection approach based on multi-hypothesis test is proposed

which evidently improves the estimation accuracy of jamming covariance matrix.Further analysis and simulation results are provided to confirm the effectiveness of the proposed waveform diverse array technique.