Research On Array Antenna Cognitive Direction Finding Technology

Array antenna direction finding technology is one of the important contents of array signal processing,and the direction finding technology mainly includes beam forming and super-resolution direction finding.The beam forming technique is flexible,but the angle resolution is affected by the beam width;the super-resolution algorithm can achieve smaller direction finding accuracy,but at the same time the complexity of the algorithm and the higher requirements of the resource,and the measuring time is relatively long.With the increasing complexity of the electromagnetic environment,the traditional array antenna direction finding technology cannot meet the increasingly complex electromagnetic environment in the direction of performance assurance and intelligent requirements of the increasingly high demand for military operations.Cognitive technology can be flexible and intelligent interaction with the environment,access to environmental information,and according to the environment to adjust or change their own performance to adapt to changes in the environment,cognitive radio,cognitive radar and cognitive electronics warfare and other fields have been widely used.In this paper,the cognitive technology is applied to the array antenna direction finding technology,the cognitive array direction finding technology is studied,the system structure of cognitive direction finding is established,and the knowledge base in the cognitive direction is analyzed,the specific work is as follows:Firstly,array antenna direction finding technology is studied,the principle of array antenna is discussed and the direction finding algorithm of array antenna is analyzed and discussed;then,the concept of cognitive technology is analyzed,the application of cognitive technology is discussed,and the cognitive theory based on "OODA loop" and the cognitive system theory are studied in detail.Secondly,the concept of array antenna cognitive direction finding is discussed in detail;the structure of the array antenna cognitive direction finding system is determined;the establishment and updating of cognitive knowledge base is analyzed;the resource scheduling model of cognitive direction finding system is explored,the scheduling strategy based on task priority decision and threat based priority decision,the scheduling strategy based on expert system,and the scheduling method based on time segmentation and channel segmentation is put forward;the process of cognitive direction finding is determined,and the cognitive direction is divided into the adjustment parameter model and the development of the exclusive channel mode;the simulation experiment of cognitive direction finding technology is carried out,and the experimental results show that the array antenna cognitive direction finding technology has certain advantages in the direction finding velocity and direction finding time,and the higher intelligence.Finally,a kind of cognitive-based fast direction finding algorithm is proposed,the algorithm can be based on cognitive technology,rapid direction finding can be used in the equipment which has limited resources and the complexity of the algorithm is not demanding.The principle of cognitive fast direction finding algorithm is studied,and the performance analysis is carried out.Finally,the simulation experiment is used to verify the theory.