中文摘要：

精度评估是航空重力测量的一项重要内容，可分为内符合精度和外符合精度两类，即基于交叉点不符值评估单个采样点观测值的内符合精度和基于外部重力参考数据评估格网平均重力异常的外符合精度。由于许多测区没有或少有外部参考重力数据，因此，为了合理评估格网平均重力异常的（内符合）精度，本文引入了所谓的“重叠格网比较法”。四个区域的实测航空重力测量数据分析表明，交叉点不符值的加权估计精度、重叠格网比较精度与外符合精度之间具有较好的一致性，实用中可视情况采用这三种方法评估航空重力测量的精度。

英文摘要：

Accuracy estimation is an important part of airborne gravimetry, which can be classified into internal accuracy and external accuracy estimation. In general, the internal accuracy of the single sample observation is evaluated with crossover errors, and the external accuracy of the grid mean gravity anomaly is estimated with known reference gravity data. Since there is often no or only few reference gravity data in many surveying areas, we introduce the so - called ~;rid - overlapping method to ap- propriately evaluate the internal accuracy of the grid mean gravity anomaly. Analysis of the real data of four surveying areas dem- onstrates that the accuracy of the weighted estimation for the crossover errors and the grid - overlapping method are all consistent well with the external accuracy. Thus, we can select suitable ways among them to evaluate the accuracy of the airborne gravity according to the actual surveys.