Analysis on the tracking performance of active radar seeker under the condition of coherent interference

The principle of the active radar seeker coherent interference was analyzed, and the mathematical expression of orientation error angle under the condition of coherent interference was established. Then the two interference sources phase difference and the signals amplitude ratio which impact the orientation error angle were simulation analyzed, it obtained that when the two interference sources phase difference is at 180°, the orientation error angle can reach the maximum. Then the coherent interference signal model was established, and the track performance of active monopulse radar seeker under the condition of coherent interference was simulation. The simulation result shown that coherent interference can effectively increase the directional error angle and the smallest distance between target and missile, when the two interference sources transmission power ratio non-linear increasing, the orientation error angle and the smallest distance between target and missile increasing greatly, that is the interference effect significantly.