GNSS大地高辅助的数字水准测量方法

Method of leveling aided by GNSS geodetic height difference

在测量工作中,往返观测有利于提高水准测量精度,有利于检查并发现单程水准测量成果中的错误和粗差,但同时也加大了外业测量工作量。现代水准测量采用智能型的数字水准仪,大大提高测量精度及可靠性。鉴此,提出一种基于数字水准仪的GNSS大地高辅助的水准测量方法。该方法利用GNSS大地高数据进行单程水准测量成果的质量检查,发现并改正测量粗差和错误,免除水准测量返测,显著降低外业测量工作量,特别适用于公路工程等线状工程三、四等高程控制测量,也可在一、二等水准测量检核中采用。通过非洲某高速公路工程高程控制测量项目验证方法的可行性和有效性。

Round-trip leveling can improve not only the accuracy and check for mistakes and gross errors, but also greatly increase the workload of field survey. By using the digital level, the precision and reliability of modern leveling are greatly improved. In this context, a digital level based leveling method aided by GNSS geodetic height is proposed. The method uses GNSS geodetic height data to check the quality of single-pass leveling results, and corrects gross errors and mistakes of which no return leveling is carries out. By this method the workload of field survey can be significantly reduced. It is especially fit for the third and fourth order leveling for linear engineering such as highway engineering, which can also be applied to checking of the first and second order leveling results. Finally, the feasibility and effectiveness of the method are verified by a highway engineering elevation control survey project in Africa.