Suppression of Systematic Errors of Electronic Distance Meters for Measurement of Short Distances

Sensors

Jaroslav Braun¹  Martin Štroner¹  Rudolf Urban²  Filip Dvořáპk²  Gary R. Pickrell² 

[1] Department of Special Geodesy, Czech Technical University in Prague, Faculty of Civil Engineering, Thákurova 7, 166 29 Prague 6, Czech Republic;

关键词: EDM;    baseline;    interferometer;    systematic error;    calibration;    short distance;    standard deviation;    pillar;    forced centring;    absolute distance;   

DOI  :  10.3390/s150819264

来源: mdpi

【 摘 要 】

In modern industrial geodesy, high demands are placed on the final accuracy, with expectations currently falling below 1 mm. The measurement methodology and surveying instruments used have to be adjusted to meet these stringent requirements, especially the total stations as the most often used instruments. A standard deviation of the measured distance is the accuracy parameter, commonly between 1 and 2 mm. This parameter is often discussed in conjunction with the determination of the real accuracy of measurements at very short distances (5–50 m) because it is generally known that this accuracy cannot be increased by simply repeating the measurement because a considerable part of the error is systematic. This article describes the detailed testing of electronic distance meters to determine the absolute size of their systematic errors, their stability over time, their repeatability and the real accuracy of their distance measurement. Twenty instruments (total stations) have been tested, and more than 60,000 distances in total were measured to determine the accuracy and precision parameters of the distance meters. Based on the experiments’ results, calibration procedures were designed, including a special correction function for each instrument, whose usage reduces the standard deviation of the measurement of distance by at least 50%.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.