Design Of Airborne Portable Lidar Signal Acquisition And Storage System

With the rapid development of airborne laser radar,its requirements for the performance of laser radar acquisition systems are getting higher and higher.First,the echo signal sampling frequency and resolution of the airborne lidar are getting higher,and the validity and reliability of the sampled data need to be guaranteed.Secondly,to ensure a correct signal sampling and and to reduce the test flight cost,the sampled data should be displayed and stored in real time.Stored data are used for data processing analysis and data playback.In addition,there is a strict limits on the weight of airborne equipment.Therefore,the research of airborne lidar signal acquisition and storage system is of great significance.Based on the mentioned development status and project requirements,this thesis designs and implements an onboard portable lidar signal acquisition and storage system.According to the project requirements analysis,this thesis uses Zynq series FPGA+DSP architecture and the FMC interface to modularize the system hardware.The system can realize the acquisition,storage and display of four-channel lidar signals and supports data export.At the same time,according to the system design requirements,the system is designed to be of low power consumption,small size,anti-interference and easy to use.This thesis starts with the design requirements of airborne portable lidar signal acquisition and storage system,in which the author comprehensively analyzes the system design requirements and introduces the basic theory of signal acquisition and storage and analog-to-digital conversion.Secondly,based on the system design requirements analysis,the overall scheme design of the system is completed,and the design scheme of the system carrier card and system mezzanine card is proposed.This thesis divides the system schematic design into seven modules with detailed description,such as sampling module,clock moduleand storage module,introduces the PCB design flow according to the signal integrity theory,and completes the PCB design.The correctness of the hardware circuit design in this thesis is verified by the circuit test of the power module,clock module,FPGA module and DSP module.Then,the program design of the system is introduced in detail.According to the system design requirements,the program designs of the modules are completed,including ADC sampling,Rapid IO communication,data processing,data storage and other modules,and the data analysis results are given.Finally,this thesis summarizes the research,introduces briefly the follow-up research work and proposes the improvement scheme for the shortcomings in the design.