Radiation Shielding Analysis Based on Structural Design of a GNSS Receiver Considering Launch and Orbit Environments of Geostationary Orbit Satellites

This paper presents the shielding analysis results for the Total Ionizing Dose(TID) accumulated in the electronic boards over the mission period(15.3 years), based on the structural design of the GNSS receiver used for orbit determination of geostationary satellites. The structural safety of the receiver housing and electronics was verified through modal analysis, quasi-static analysis, and random vibration analysis to assess the various mechanical loads induced by the satellite's launch and flight events. The shielding analysis for the TID accumulated in the electronic boards inside the housing of the receiver, which has confirmed structural stability, was conducted using the three-dimensional reverse Monte Carlo method. Reflecting the results of this analysis, the final modified receiver has been confirmed to have adequate design margins against the high radiation levels accumulated during the mission duration of the geostationary satellite, along with structural safety.