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1·An artificial random disturbance is carried out for some seismological observation data in the allowance range of seismological observational error with random disturbance method.

采用随机干扰方法，在地震观测误差容许值范围内，对地震观测资料进行人为随机干扰。

2·Using the statistically optimal inversion method 50 sets of simulation microwave radiation data are retrieved. The influence of observational error on the inversion accuracy is discussed.

运用统计最优反演方法对50组模拟的微波辐射资料进行了反演，并讨论了观测误差对反演精度的影响。

3·The second part shows GPS observational equation, the corresponding error sources, the characteristics of errors and the essential methods for error processing.

第二是有关GPS观测方程和相关误差产生的原因，分析了误差的特点和处理的基本方法。

4·In this paper, a simple numerical experiment of the analysis error of statistical interpolation has been made by using ideal observational network.

采用理想观测网，用数值方法计算统计插值分析误差。