The pseudo-satellite is stationary for the reference station receiver, therefore, the distance among reference station receivers is nearly kept constant. On that condition, the error caused by sampling and quantization is not Gaussian variables, which can have impact on the measurement accuracy. In order to solve the problem, the digital signal model of satellite navigation receiver was introduced, and then the effect of sampling and quantization error on measure bias was analyzed. Simulation results are presented to support the conclusion, and the optimization of reference receiver in pseudosatellite system is proposed in the end. 