中文摘要：

本文系统介绍了等权模型、高度角模型、信噪比模型（SIGMA-ε）、验后估计模型（MINQUE）等4类随机模型,针对不同长度的基线,对比和分析了利用不同随机模型得到的载波相位双差残差序列、整周模糊度固定的可靠性和速度以及基线向量解。结果表明：对于系统误差较小的短基线,验后估计模型（MINQUE）和信噪比模型（SIGMA-ε）优于其他两种模型;且随着基线长度的增加,系统误差对MINQUE模型的影响较其他模型更为显著。

英文摘要：

Four stochastic models were demonstrated in the paper that are equal-weight model,model based on satellite elevations,model based on signal-to-nosie （SIGMA-ε） and model based on rigorous statistical method （MINQUE）.Three parameters were compared and analyzed based on different stochastic models for different lengths of baseline,which are the residuals of doubledifferenced GPS carrier phase,the reliabilities and speeds for fixing ambiguity and the baseline vectors.The results showed that MINQUE and SIGMA-εwere more reliable than the other two models as the baseline was short and no significant systematic errors existed.With the increasing of the baseline length,the effect on MINQUE model was more prominent than other models.