Abstract: ‍ ‍Anti jamming is a hot topic in the radar field and digital Radio Frequency Memory （DRFM） devices can deceive radar system by transmitting signals like real targets， posing a tough challenge to conventional radar systems. This paper presents a method for pulse-Doppler （PD） radar to combat with deceptive jamming signals and it perturbates its phases slightly so that， if a deceptive jamming does not always transmit a full replica of radar signals， a PD radar can classify deceptive signals with a high pulse coherence to maintain the clutter suppression performance. Simulation results indicate that by optimizing perturbation amplitudes over different signal chips， the deceptive jamming classification performance can be improved， at the expense of controllable peak sidelobe level （PSL） raise and clutter suppression performance degration.