Colocated MIMO radar waveform design against repeat radar jammers

The digital radio frequency memory (DRFM) repeat jammer, which replicas the transmit signal and transmits back to radar receiver to create deceptive targets, is a cheap and quite destructive electronic attack. This paper concerns waveform design at the background of colocated multiple-input multiple-output (MIMO) radar to combat with the repeat jammers. Specifically, since the amplifiers of transmit circuits of repeat jammers often operate in the saturation mode, the repeat jamming signals should be constant modulus. However, for colocated MIMO radar, the synthetic angular waveform in space often is nonconstant modulus, which may have better performance in such environment. Under the assumption that hostile jammers operate in the saturation mode, we formulate a min-max design criterion that minimizes cross correlation between an angular waveform and a constant modulus waveform with the same phase terms. Numerical results validate the effectiveness of the proposed method.