Research On Cooperative Decoy Technology Of Passive Positioning System

Electronic countermeasure is a greatly important part of modern war,which can decide the trend and result of a war to a certain extent.Passive positioning technology is an essential component in the field of electronic countermeasure.The enemy can guide the weapon to attack by positioning our own radar.From the perspective of radar active defense,it is of great significance to improve the survivability of radar if the passive positioning system of enemy can be tricked to make the positioning mistake.This thesis mainly studies the cooperative decoy technique of passive location system,especially the cooperative decoy method of passive direction-finding cross location system and passive time difference location system.The cooperative decoy method proposed in this thesis can flexibly change the position of the fake target,in addition under certain conditions,the decoy station can carry out the decoy without exposing its real position,which is conducive to the continuous protection operation.The main work of this thesis is as follows:1.The thesis studies the specific amplitude direction-finding technology and phase interferometer direction finding technology,and discusses the decoy methods of the two kinds of direction-finding technology.Moreover,the thesis analyzes the effect of decoy signals with different parameters on direction-finding and provides the corresponding simulation analysis.2.The thesis studies the passive direction-finding cross location technology,and the thesis proposes a cooperative decoy method of passive direction-finding and cross positioning system.Based on the trap method of direction-finding technology,several false targets can be arranged at different spatial locations through the cooperation between radar and synergy and adjusting relevant signal parameters such as power,phase and launch time,to protect the radar.The thesis also provides simulation analysis in the scene of reconnaissance aircraft direction-finding and cross location.3.The thesis studies the method of passive time difference positioning,discusses the decoy method of single decoy station to passive time difference positioning and analyzes the decoy effect under different decoy signal styles.Based on the single bait stand lure method,the thesis proposes a distributed cooperative decoy method for passive time difference positioning system,i.e.setting up multiple distributed decoy stations to simulate the signal time difference characteristics of false targets through the timing coordination of signals between decoy stations.The proposed method can not only accurately specify the location of the false target formation,but supply continuous protection to the bait station.Finally,the thesis simulates under the conditions of "one-to-one" and "many to many" respectively,and analyzes the position distribution of false targets under different conditions.