Micro SAR Imaging System Based On Eight-rotor UAV Platform

As eight-rotor unmanned aerial vehicle(UAV)light-weight,easy operation and flexible,has a wide range of civilian and military value.With the development of China's microwave imaging technology,micro-high-performance synthetic radar gradually overcomes the difficulty of miniaturization,low power and high-resolution imaging technology.Based on the research of eight-rotor UAV and miniature synthetic aperture radar(SAR)imaging system,UAV-based micro-SAR imaging system has been designed,built and tested in this paper.The aim of this paper is to design a small-sized,cost-effective,easy-handy miniaturize SAR system with the ability to make repeated flights for extended study.This paper focuses on the following aspects:1.According to the maneuverability and mission requirements of miniature UAV,the system's requirement index is proposed,and the corresponding devices and aircraft are selected.The design followed the Frequency modulated continuous wave(FMCW)principle.This paper presents the facility of the mini eight-rotor UAV-based X-band SAR system,and describes the components of SAR system.2.Analytical development of the FMCW SAR signal model,starting from the dechirp signal and without using stop-and-go approximation,is presented in this paper.Dechirp reduces bandwidth,introduces residual video phase(RVP),resulting in resolution related to delay time.Based on the above analysis,the improved Range Doppler(RD)image algorithm is proposed and verified by simulation.3.The simulation results of the experimental parameters and the imaging results of SAR system flight check show that the proposed system work reliably in the demand environment and obtain high-quality SAR images.