The Cooperative Anti-Jamming Technology Of Multi-Mode Composite Seeker

With the types of interference increasingly become diverse and complex,the single-mode guidance method is getting lower and lower in anti-jamming performance.In order to combat interference effectively,the multi-mode compound guidance method has been widely used.Since the multi-mode composite guidance needs to fuse the data information of each sensor,how to judge whether there is a sensor interfered and determine which sensor is interfered directly affects the tracking result of the seeker.The research work of this dissertation is based on the cooperative anti-jamming problem of a three-sensor compound guidance,which consists of the rader,infrared and laser sensors.First,this dissertation briefly analyzes the possible interferences that rader,infrared and laser sensors may face and the machanism of these interferences.Second,based on this analysis,a distributed and feature-level three-mode composite information fusion anti-jamming scheme is designed for the common-aperature structure of the seeker.This scheme includes the front end of each sensor and processing unit of information fusion.And the unit includes five steps: track formation,space-time registration,track association,feature fusion and track fusion.The track association step reflect anti-jamming strategy of this scheme.According to the scheme,first,this dissertation introduces the data association algorithm,track management and ?-? filtering algorithm that needs to be used in the track formation process.The data association algorithm mainly introduces the nearest neighbor data association and the improved cheap joint probilistic data association,and verifies the application of the two data association algorithms and the performance of the filter algorithm through simulation experiments.Then,the space-time registration,track association algorithm and track fusion algorithm are mentioned.This dissertation not only introduces the MK-NN association algorithm,but also introduces the improved MK-NN association,where can determine which sensor has been disturbed by the real-time sliding window method and leading into the reference track.The simulation results show that the improved MK-NN association has stronger anti-jamming ability than the MK-NN association,and it can effectively improve the anti-jamming ability of the seeker.In the end,according to the various algorithms introduced in the previous dissertation,in order to implement information fusion and anti-jamming technology for engineering implementation,the dissertation establishes a system of information fusion.Firstly,the overall workflow of the system of information fusion is introduced.Then the three-mode track assocation strategy is introduced.And for the single-mode,dual-mode and three-mode guidance stages of the seeker,this disseration give a corresponding scheme of cooperative anti-jamming based on track association.In order to verify whether the function and performance of the system meet the requirements,this disseration also develop a digital simulation testing system of information fusion based on computer modeling simulation technology.Through the digital simulation testing system,the function of information fusion system,processing delay of information fusion processing and anti-jamming indicators for 9 modes are tested.These 9 modes include single interference mode and multiple interference combination modes.The test results show that three-mode composite information fusion system can effectively confront the interferences of the 9 modes,and none of the single modes can resist these interferences.This proves the effectiveness of the cooperative anti-jamming technology.