Temperature Acquisition System for Real Time Application of First Velocity Correction by EDM (Electronic Distance Measurement)

Felipe Andrés Carvajal Rodriguez, Luis Augusto Koenig Veiga, Wilson Alcântara Soares
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引用次数: 3

Abstract

The first velocity correction is used to correct the measured distance affected by the velocity variation of the electromagnetic wave propagation in a medium. This correction depends on the refractive index of the propagation medium and reference refractive index. The influence of the temperature in the medium refractive index is critical; some estimates establish that variation 1°C causes 1ppm of error in distances. In the measuring processes with total stations, the temperature is usually collected at only one point, for example, in the position where the measuring instrument is setup. However, the wave propagates in a medium of non-constant temperature, where the extremes of the line can present variations and thus this measurement in only one point could be non-representative. In this context, it was developed a low-cost real-time temperature acquisition system. This system provides the temperature values in different locations allowing their monitoring through the time. Experiments realized during the geodetic monitoring of a dam, show variations up to 8°C among geodetic points on the dam and around it. An analysis was development to evaluate the influence of temperature variations on monitoring distances and geodetic coordinate of a 2d network with different approaches (temperature modeling).  The results shows different values for distances (1.0 mm) and coordinates (0.5 mm) depending of the approach choose.
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EDM第一速度校正实时应用温度采集系统
第一速度校正用于校正受介质中电磁波传播速度变化影响的测量距离。该校正取决于传播介质的折射率和参考折射率。温度对介质折射率的影响是至关重要的;一些估计表明,1°C的变化会导致1ppm的距离误差。在全站仪的测量过程中,温度通常只在一个点收集,例如,在设置测量仪器的位置。然而,波在非恒定温度的介质中传播,其中线的极端可能会出现变化,因此仅在一个点上的测量可能不具有代表性。在此背景下,开发了一种低成本的实时温度采集系统。该系统提供不同位置的温度值,从而允许在整个时间内对其进行监测。在大坝大地测量监测过程中进行的实验显示,大坝及其周围的大地测量点之间的变化高达8°C。正在进行分析,以评估温度变化对不同方法(温度建模)的二维网络的监测距离和大地坐标的影响。结果显示,根据所选择的方法,距离(1.0 mm)和坐标(0.5 mm)的值不同。
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来源期刊
Geoplanning Journal of Geomatics and Planning
Geoplanning Journal of Geomatics and Planning Earth and Planetary Sciences-Computers in Earth Sciences
CiteScore
1.00
自引率
0.00%
发文量
5
审稿时长
4 weeks
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