Study on crystal oscillator frequency drift model and performance of low orbit satellite

Aiming at the problem of frequency drift of crystal oscillator due to temperature and aging characteristics, a mathematical model of clock frequency drift of crystal oscillator was established by analyzing the telemetry data of a solar synchronous orbit satellite over the years. The mathematical models of clock frequency drift of several crystal oscillators are established. The fitting accuracy is taken as the evaluation index to compare several models and determine the optimal model. The model can be used to fit and verify the crystal oscillator output frequency, which can meet the continuous time calibration service of spacecraft when GPS/BD is not available, and can provide reference for on-board autonomous time calibration or long-term management on the ground.