engleski

Precise Determination of Calibration Baseline Distances

Some errors that affect the accuracy of electronic distance measurement (EDM) instruments can be determined in a laboratory, but most are detectable and measurable only on a calibration baseline on which distances are precisely determined. In this paper, precise distance determination is presented on the calibration baseline of the Faculty of Geodesy, University of Zagreb, Croatia, using a precise total station Leica TCA2003. The corrections and reductions for precise calibration baseline distance determination are described theoretically: additive constant, first and second velocity correction, periodic error correction, reduction to the baseline mean height using station heights (in two steps), reduction for horizontal transversal deviation of the baseline, and scale error correction. Field distance and atmospheric parameter measurements are explained, with testing of periodic errors and scale error. In postprocessing, measured distances are corrected and reduced by applicable corrections and reductions, and subsequently adjusted using a Gauss-Markov model with the least-squares principle. Final distances are given with their uncertainty, together with a standard uncertainty evaluation for 1, 000-m distance measurement according to current international standards.

Calibration baseline ; EDM ; Distance ; Corrections and reductions ; Measurement uncertainty

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