Design Of Interferometer Direction Finding System

In the modern complex electromagnetic environment,the electronic warfare needs the reconnaissance system to obtain the information of the enemy radiation source and position under the premise of hidden security.Passive detection system not only detects under the premise of concealment security,but also has a longer distance than active detection.The direction finding technology of interferometer is an important direction finding method in passive detection system.The interferometer direction finding method has the advantages of high measurement accuracy,flexible and stable system operation,simple algorithm and fast processing speed.It is a relatively good passive detection and direction finding system,and plays a great role in passive detection,electronic countermeasure,aviation and navigation,military investigation and so on.This paper focuses on the design of an interferometer direction finding system,which has the characteristics of wide frequency coverage,full coverage in airspace and high direction finding accuracy.The main tasks of this project are as follows:1.The whole design of the direction finding system of interferometer is completed.According to the system requirements and design indexes,the receiver system selects the super heterodyne receiver combined with Digital Channelization receiving system,and the direction finding mode selects the direction finding system of three baseline interferometer,and constructs 360° coverage of 0.4～18GHz frequency The design idea of the system with the characteristics of full coverage,high precision direction finding and long distance of action;2.The hardware and software design of the interferometer direction finding system is completed,and the components and main functions of the system are described.The paper analyzes the direction finding antenna array,microwave front end,signal processing extension,self positioning component and power supply component of each component,expounds the design ideas and design indexes of each component,and describes the design methods of each part in detail.Then,the software of the system is described,and the content of structure design is introduced to achieve the actual use environment;3.According to the design scheme,the system production and joint commissioning test work are completed,the phase difference correction of the system is completed,and the functional performance tests such as the direction finding accuracy of the system are carried out.Meanwhile,the problems in the test process are analyzed and solved to ensure that the performance indexes of the products to meet the requirements of the task.From the test results,it can be seen that all indexes of the system meet the design requirements,and the system design method is reasonable and feasible.Finally,the paper summarized and analyzed the subject,and looking forward to the development requirements of the large dynamic,wide-band,stronger complex electromagnetic environment adaptability and further detection distance of the following interferometer direction finding system.