| The detection of high-energy cosmic rays is of important research value in the exploration of the origin of the universe,which has always been a subject attracting human exploration.Using the detection of extensive air shower(EAS)radio signals to study ultra-high-energy cosmic rays(UHECRs),especially ultra-high-energy(UHE)neutrinos,is an important detection method in the field of high energy cosmic ray detection.The large ground radio detection arrays can achieve the high sensitivity and statistical scale required for UHE neutrino astronomy and cosmic ray detection,which has become a promising research direction.Most of the existing EAS radio signal analysis in view of the small inclination and dual polarization,while the large inclination and full polarization detection data is still blank.Based on this background,the thesis relies on the GRAND(The Giant Radio Array for Neutrino Detection),an international cooperation project,to carry out the research on radio detection antenna.the chief contributions are as follows :1.The research background and significance of the thesis are investigated,and the domestic and foreign research status of EAS radio signal detection in theory,simulation and experiment is summarized.This thesis systematically introduces the working principle of large ground radio detection arrays and the related basic theory of EAS.2.The reliability and consistency of ZHAire S and Co REAS in the simulation of large inclination EAS radio signal are verified.The thesis summarizes the characteristics of EAS radio signals,analyzes the applicability of classical antenna far-field receiving mode and summarizes the design requirements of radio detection antenna,which based on their timedomain pulse,spectrum,wavefront and spatial distribution characteristics triggered by particles with different types,energies and incident angles at the observation point on,inside and outside the Cherenkov ring.3.This thesis introduces the principle of LFmap algorithm which can calculate the Galactic noise,and then completes the calculation of Galactic noise from 30 MHz to 250 MHz at Lenghu Station in Qinghai,China on January 1,2020 by using LFmap algorithm as an example.4.A tri-polarized butterfly-shaped dipole antenna is designed to meet the requirements as the active antenna unit.The effects of accessories in the array element and sand on the antenna element are analyzed.The test of the antenna with matching network is carried out,and the power supply capacity of the solar power supply system is tested.5.The link simulation of RF receiving system with and without noise interference is completed by using the gain data of the tri-polarized butterfly-shaped dipole antenna.Finally,the noise spectrum without broadcast signal interference is measured in the target site of desert.In this thesis,the analysis of large-inclination EAS radio signal,the design of radio detection antenna and the calculation of antenna response lay the foundation for large-inclination EAS radio detection triggered by high energy cosmic rays. |
