Research On Radiation Hardness For Electronic System Of Remote Sensing Satellite Camera

The damage of space radiation to electronic systems causes satellite failure.In order to ensure the normal operation of space cameras,and improve the survivability against space radiation and nuclear environment,it is necessary to strengthen the anti-radiation protection of basic components and integrated circuits for making electronic systems to work steadily and reliably in space radiation environment.The research work of this paper is based on the influence of space radiation on satellite electronic system and its reinforcement.It includes the following aspects:Firstly,the statistical analysis and research on the failure of satellite camera electronics system caused by space radiation at home and abroad are discussed.The bottlenecks of the application of space radiation reinforcement in domestic space camera electronics system are analyzed.Characteristics of various methods are compared.The background and significance of this subject are explained.According to the spatial orbital conditions commonly used in space cameras,space environment analysis and research are carried out for two types of typical orbits.Secondly,the space radiation of solar synchronous orbit at 1000 km(critical inclination 63.4 degrees),1000 km(critical inclination 99.95 degrees)and 650 km(critical inclination 97.3 degrees)is simulated and compared.The total dose of proton,electronic environment and space radiation at different altitudes are calculated and analyzed respectively.Further,according to the statistical characteristics of the spatial environment radiation,the effects of solar protons and high-energy electron storms are analyzed.The simulation and analysis of the orbital space radiation environment and determination of the space radiation model have important guidance and engineering implementation significance for the anti-radiation reinforcement application of the satellite camera electronics system.After that,based on the establishment of actual spatial radiation model,the space radiation simulation analysis for the solar synchronization and adjacent orbits at different orbital altitudes is carried out.At the same time,the space radiation protection effect of the satellite camera electronic system is simulated and calculated by adding space radiation shielding material Al.The total radiation dose of the system in the 5-year and 8-year operation period in the space radiation environment of 1000 km orbital altitude is analyzed and compared,respectively.After analysis and comparison,it is found that when Al is used as shielding material,the total dose of space radiation decreases gradually to saturation with the increase of Al thickness.Therefore,it has limitations that depending on the thickness of shielding materials to improve the radiation shielding effect.This method can meet requirements of the space radiation environment of electronic systems only in a certain range of applications.With the rapid development of microelectronics technology integration,the feature size of microelectronics devices is becoming smaller and smaller,and the single event effect of space radiation is more obvious.The flux rates and their distributions of radiated electrons and protons in space are simulated and analyzed.It is concluded that changes regulation of the fluxes of electron and proton space environment for 5 and 8 years in the space environment with orbital altitude of 1000 km.It is of great help to the design of anti-radiation reinforcement scheme and shielding reinforcement technology.Finally,according to the space radiation simulation model in Chapter 2 and 3,the variation law of radiation attenuation radiation dose of radiation shielding materials,and the energy variation distribution of space radiation particle flux,a new type of radiation-resistant composite protective material for space camera electronics system working in space radiation environment for 5 years and 8 years at 1000 km orbital altitude is presented.This new material can effectively attenuate the total radiation dose without increasing the size and thickness,and absorb space electrons and protons,reducing the single-particle effect of the microelectronic device.It is proved that the new composite protective material has obvious effect and strong engineering practicability through electron accelerated radiation experiments.