Key Technologies Research And Verification Of UAV Spectrum Monitoring Waveform Transmission

With the wide use of UAVs in various fields,the UAV spectrum monitoring technology integrates the advantages of convenience,speed,and flexibility.It is one of the research hot spots for radio interference monitoring.The miniaturized,low-cost,and reliable waveform transmission communication link is an indispensable part of the entire UAV spectrum monitoring system.This paper studies and verifies the low-cost airborne transmission waveform system,which is mainly applied to the waveform transmission of terrestrial interference to the TV repeater satellites.First,the paper reviews the development of radio spectrum monitoring at home and abroad,looks forward to the current direction of technology development in the field of spectrum monitoring,puts forward advantages of spectrum monitoring for UAVs,and introduces a UAV spectrum monitoring device in conjunction with features of the product of a domestic company.Second,the paper investigates the ground-air communication channel of UAVs in urban areas and combines the particular application with the model of the channel when UAVs perform spectrum monitoring and uses Matlab to complete the simulation verification of the modeling channel.Through this model,the specific link budget of UAV spectrum monitoring transmission waveform system is provided,which provides guidance for the specific design of the baseband signal processing of the next transmission waveform.According to the characteristics of the channel and the cost,size,and payload of the particular project implementation platform,this design chooses a single-carrier frequency domain equalization transmission scheme,and further analyzes the time-frequency synchronization algorithm,channel estimation and equalization algorithm,and finally makes a choice according to our particular need.The design of baseband signal processing of spectrum monitoring transmission waveform is completed,and the simulation verification of the design is implemented on Matlab.Simulation results show that under our model of spectral transmission waveform channel,this design can meet our requirements.Finally,we use the software radio platform to complete the relevant design and verification,providing a certain reference for the design of UAV-based system for spectrum monitoring waveform transmission.