A Simulation Study Of Near Space Atmospheric Neutron And Its Single Event Effects To Electronic Device

The near space is the region between 20km and 100km above ground. In recent years, the strategic value of the near space has given rise to national attention. Atmospheric neutron is the main radioactive particle in the near space that induced single event effects (SEE) and seriously imperils the safety of the aircraft at this altitude. With the progress of the semiconductor production technology, the SEE induced by atmospheric neutron at ground height and high latitudes of avionics altitude is getting more and more serious.To protect the safety of the near space aircraft, the neutron environment and the SEE should be evaluated. In this paper, the variations of the atmospheric neutron spectra with time, altitude, longitude, latitude are studied by computer simulation. The neutron spectra of near space at any time and place can be calculated, providing the environment parameter for evaluating the level of SEE. The variation of single event upset (SEU) cross section with neutron energy is investigated by ground testing and computer simulation. A part of the simulation results are verified by ground testing. The results of SEU cross section providing the basis for filter devices. Combination of the near space atmospheric neutron spectra and the SEU cross section, the SEU rate during the entire flight can be evaluated. The results of the near space neutron environment and the cross section induced by neutron as well as the SEU rate calculated by our methods and software agree well with the results calculated by foreign model and ground testing as well as the flight testing.This work is the first time researched at home, and it has an important reference value for the subsequent research and the development of near space aircraft.