面向测距仪检定的高精度长距离室内光纤基线构建方法

测距仪的检定依赖于长度标准，即所谓的基线。但是，目前高精度（小于1/100万）、长距离（大于1000米）的基线只存在于野外，未能在室内实现；所以测距仪的检定仍然只能依靠野外基线进行，检定过程常受自然条件制约。一些学者的研究表明光纤在室内长基线建立中极具前景。因此，本项目将专注于用光纤建立室内基线的方法，并将研究重点放到高精度、长距离这两个核心问题的解决上，主要研究内容如下：（1）室内长距离光纤基线的建立方法和方案设计；（2）建立长距离高精度光纤基线的影响因子的确定；（3）光纤基线的精度评定，即通过影响因子建立和优化基线相对不确定度模型，使模型计算结果在长距离的基础上满足高精度的基线设计标准。本项目的研究成果可望为建立室内光纤基线提供理论支持，使测距仪器的室内检定成为可能。

The verification of Electronic Distance Meters (EDMs) requires a standard length, or baseline. But baselines with high-accuracy (<1/1000000) and long-distance (>1000m) are only available in the field nowadays, and cannot be achieved indoor so far. So EDMs verification can only rely on the field baseline, and the verification process is often restricted by natural conditions. Pioneering studies have shown that optical fiber is a promising tool in developing indoor baselines; thus, this study concentrates on the methods for building indoor baselines and emphasizes on “high-accuracy” and “long-distance” of the optical fiber baselines. The main tasks of this study include: (1) to explore the method and scheme design of establishing an indoor long fiber optical baseline ; (2) to determine the influence factors of the long-distance and high-accuracy baseline; and (3) to evaluate the accuracy of the optical fiber baseline, that is, to establish and optimize the baseline relative uncertainty model through the influence factors in order that the calculation results of the model can meet the high-accuracy baseline design standard besides the long-distance standard. The potential achievements of this study can lay a theoretical foundation for building indoor high-accuracy and long-distance optical fiber baselines, and make it possible to verify EDMs indoor.