Coherent decoys jamming anti-radiation missiles

Coherent decoys can guide the passive radar seeker (PRS) of anti-radiation missile (ARM) to a point completely outside the extremities of target. The difficulty of the final practicality of coherent jamming is the accurate phase difference control of two coherent decoys at PRS. Model of two coherent decoys jamming ARM is built in this paper, which includes two coherent jamming transmitters and one receiver and this system can keep jam all the time. Phase difference at PRS is obtained through a new method, which using the echo of dual-frequencies jamming decoys received by the receiver. With phase difference obtained by this method, coherent jamming signals are generated to confront ARM. Simulation results demonstrate the effectiveness of this method.