For the problem of selecting reference source in the position calibration technique for satellite time difference of arrival( TDOA) location system,an error analysis model is found in this paper and the in-fluence of systemic error and stochastic error of parameters on calibration accuracy is analyzed. Two im-provement parameters on location error are defined to describe the improving capability on position accura-cy. The parameters can be calculated in theory and used in evaluating the effect of calibration,which pro-vides support for selecting reference source. Finally,the effectiveness of the error analysis model and the improvement parameters is verified through simulation.%针对时差型卫星定位系统位置标校算法中标校源选择的问题，首先建立了基于单个标校源的标校方法的误差分析模型，分析了参数的系统性误差和随机测量误差对标校效果的影响；其次，定义了两类定位误差改善因子，用来定量描述标校算法对定位精度的改善能力，并可以通过理论计算评价标校源的标校效果，从而为标校源的选择提供了依据。最后，仿真分析验证了误差分析模型及定位误差改善因子的有效性。
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