Theory of the local scale parameter method for EDM
Theory of the local scale parameter method for EDM
复制标题
电火花加工局部尺度参数法原理
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
J. M. Rüeger
中科院分区：
文献类型：
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作者：
F. Brunner;J. M. Rüeger
确定波程的代表性折射率是制约电子距离测量精度的主要因素。为了克服这一局限性，最初提出了长度比方法，后来发展为局部尺度参数（LSP）方法。本文基于大气边界层的物理特性，从第一性原理出发，推导了LSP法测量电光距离的数学模型。该模型不依赖于“标准大气”。结果表明，大气温度和压力必须在仪器站观测，而在反射站则不需要观测。总结了适当的LSP现场程序和一些现场试验的结果。该方法的准确度始终优于±1 ppm。建议使用该方法用于高精度（三边测量）网络，这些网络需要重复测量，并且绝对比例尺不相关。
The determination of a representative refractive index for the wave path is the main limitation of the attainable accuracy in electronic distance measurement. To overcome this limitation the length ratio method was initially proposed and later developed into the local scale parameter (LSP) method. In this paper, the mathematical model of the LSP method is derived for electro-optical distance measurement from first principles based on the physics of the atmospheric boundary layer. The model does not rely on ‘standard atmospheres’. It is shown that atmospheric temperatures and pressures must be observed at instrument stations but not at reflector stations. Appropriate LSP field procedures and the results of some field experiments are summarized. The method consistently produces accuracies of better than ±1 ppm. Use of the method is recommended for high precision (trilateration) networks, which need to be measured repeatedly and where absolute scale is not relevant.