The Research On Angle Estimation Based On Telecontrol And Telemetry Data Link Of UAV

The new generation of UAV technology has gained extensive attention and rapid development in the military and civilian fields,due to its many advantages such as miniaturization,low cost,and high comprehensiveness.At present,it has become one of the research hotspots of advanced technology in countries around the world.Since UAV often need to perform tasks in complex and volatile environment,it is particularly important to ensure stable communication between UAV and ground control systems.This thesis focuses on the angle estimation technology in the telecontrol and telemetry system of UAV.Aiming at the problems of complexity function,high cost of hardware and software resources,and many measurement errors of the traditional telecontrol and telemetry system of shipborne UAV,a new telecontrol and telemetry system of UAV based on communication data link of shipborne phased array is proposed.Through the angle estimation processing and error calibration of UAV target,the accurate spatial position of UAV target is acquired in real time,which provides guidance for beam scheduling of the telecontrol and telemetry system,and ensures the stability and reliability of the communication of the UAV data link.The main work arrangement of this thesis is as follows:Firstly,according to the requirements of each function index of the angle estimation based on the telecontrol and telemetry system.Designed the system structure and signal model.Moreover,the overall planning of the angle estimation based on the telecontrol and telemetry system is given,including the detailed design of the phased array antenna subsystem,the RF receiving subsystem,the gain control subsystem,the search and capture subsystem and the angle estimation subsystem.The basic principle and communication performance of OFDM signal are analyzed.Secondly,according to the performance requirements of the angle estimation,construct the phased array model and the principle of phased array antenna pattern formation is studied.Comparative research of the methods of sum-difference beamforming based on phased array.The principle steps of four monopulse angle measurement algorithms are briefly described and the comparative analysis of angle measurement performance is given.A monopulse angle measurement algorithm based on OFDM is designed,and furthermore,its angle measurement performance is verified through simulation.Thirdly,aiming at the problems of errors from the angle estimation based on the telecontrol and telemetry system,the errors in the system are analyzed in detail,including the amplitude and phase imbalance errors of the sum-difference channels,the amplitude and phase imbalance errors of the array channels,the phase ambiguity errors,the angle measurement parameter errors etc.The source of errors is studied and the influence of errors on the angle measurement accuracy is analyzed through building the simulation model.Errors calibration methods are designed,moreover,the software design and experimental measurement of online error calibration are completed.Finally,aiming at the problems of software-hardware codesign of the angle estimation based on the telecontrol and telemetry system.The software and hardware solution of angle estimation system is presented and the overall software and hardware plan is given.The collaborative processing architecture of angle measurement module and each task module is constructed.The data acquisition function of RF system base on AD9361 is realized.The signal processing and data acquisition processes are designed.The joint debugging between the functional modules in the angle estimation system is completed and the system function has been verified in the field experiment environment.