Research And Implementation Of L/S Band Auto Tracking Receiving Antenna System

Auto tracking antenna plays an important role in aerospace measurement and control,electronic countermeasure,UAV and other applications.In this thesis,an auto tracking antenna system working in L/S band is studied,which can track the moving objects in space quickly.Compared with monopulse tracking scheme,the auto tracking antenna adopts conical scanning auto tracking scheme,which has the advantages of low cost,simple principle and amplitude tracking only without phase correction.The auto tracking antenna with servo system can complete target acquisition and tracking,and has better tracking and angle measurement functions.Conical scanning technique has wide application value and prospect in automatic tracking antenna system.This thesis is divided into three parts and the main contributions are summarized as follows:The principle of auto tracking feed based on wideband element and wideband array theory is studied.According to the engineering requirements,a broadband five-element array feed is designed through theoretical analysis,modeling and simulation.The general design method of auto tracking feed is obtained by analyzing and optimizing the structural parameters of the elements and the optimization of array,and the design parameters are given.The design method is verified by machining a principle prototype and testing.The feed synthesis network is analyzed and studied.The analysis method and design parameters of feed network of auto tracking system are given,and the array antenna with good circular polarization characteristics is realized.The working principle and engineering realization of the tracking receiver of the auto tracking system is introduced.The feed system and reflector antenna are simulated and optimized by multi-software.The simulation results are in good agreement with the design results,which proves that the proposed design method is effective and feasible.The principle prototype of auto tracking antenna system is developed and tested with a 7.3 meter aperture antenna.A large number of materials,structures and process problems encountered in the process have great influence on the electrical properties of the system.The solution is given by analyzing the mechanism of the system.The final test results meet all the requirements of the indicators,which lay a technical foundation for the subsequent engineering applications,and accumulated engineering experience.