Research on satellite clock error simulation

For currently common satellite clock error simulation models,the characteristics of random noise of the satellite clock error itself are not taken into consideration,or simply use white noise instead.In fact,the satellite clock error mainly comprises five types of independent random noise.Different satellite clocks have different types of noise,and satellite clocks of the same type also have different features of noise.The modified Allan variance is used to evaluate the frequency-domain stability of actual clock error data,on the basis of which the high fidelity simulation of the satellite clock error is done combining five models of random noise and the quadratic polynomial model of clock error.