Research On Key Technologies Of UAV Hyperspectral Data Acquisition System

UAV hyper-spectral remote sensing is a hyper-spectral remote sensing technology carried on the UAV flight platform,which makes the acquisition of hyper-spectral remote sensing data more convenient and diversified.However,due to the shortcomings of the UAV platform,the hyper-spectral remote sensing system is greatly restricted by volume and weight.At the same time,because hyper-spectral sensors need to collect tens or even hundreds of bands of image data simultaneously at high speed,it brings certain difficulties to data transmission,preprocessing and storage.In addition,in order to achieve high-precision geometric positioning and geocoding of linear array hyper-spectral data,it’s often necessary to perform high-precision time synchronization processing on high-speed collected image data and synchronized received GNSS data.Therefore,it is very important to study a lightweight,high-precision,high-performance UAV hyper-spectral image acquisition system.Aiming at the existing shortcomings of UAV hyper-spectral remote sensing system,this paper designs a set of linear array hyper-spectral remote sensing data acquisition system suitable for small multi-rotor UAV and fixed-wing UAV,which can realize hyper-spectral linear array.Synchronous collection,processing and storage of data,time synchronization data,and POS data.The main work and results of this paper are as follows:1.A lightweight and miniaturized UAV hyper-spectral image acquisition system is designed.This system is composed of four parts: hyper-spectral camera,high-precision POS equipment,control circuit and high-speed storage system.While improving the overall integration of the system,it has certain scalability and meets the needs of practical applications;2.Develop a time synchronization optimization algorithm based on FPGA.Use related control signals as trigger conditions to achieve high-precision matching of image data and time synchronization data;3.Propose a storage rate optimization algorithm based on FPGA and SD3.0protocol.Write the collected linear array hyper-spectral raw data into the SD card sector,and restore the original data written in the SD card to obtain a three-dimensional hyper-spectral image to achieve reliable data storage.After experimental verification,the UAV hyper-spectral image data acquisition system designed in this paper has a compact structure,high work efficiency,time synchronization data accuracy up to nanoseconds,and original data storage rate up to60MB/s,which has certain application value and applications.prospect.