Abstract
Outdoor baseline is the special length standard in the field of surveying and mapping, it can be used to verify the addition and multiplication constants of the total station and other photoelectric rangefinders. In order to ensure the authenticity, accuracy and reliability of verification results, conducting outdoor baseline traceability periodically is essential. At present, direct measurement by 24m invar tape or high precision electro-optical measurement is mainly used to achieve the traceability of outdoor baseline in China. Based on Shenyang baseline field, high precision rangefinder μ-base, 24m invar tape and high precision GNSS receivers are used for comparison experiments, and the experimental results are analyzed.
Highlights
There are three calibration methods to measure the standard length of outdoor baseline, optical interferometry by Vaisala interference comparator, direct measurement by 24m invar tape and high precision electro-optical measurement
The first geodetic survey team is the only national field large-length quantity transmission institution authorized by the state, and undertakes the periodic verification work of dozens of outdoor baselines
According to table 5, the system error between μbase and 24m invar tape is submillimeter, but it can not be ignored for the accuracy of baseline calibration
Summary
There are three calibration methods to measure the standard length of outdoor baseline, optical interferometry by Vaisala interference comparator, direct measurement by 24m invar tape and high precision electro-optical measurement. The measurement method by 24m invar tape is intuitive, and the error correction model is clear, but the measurement efficiency is low. Through the unremitting efforts of researchers, the systematic error is gradually reduced Compared with those two methods, the measurement baseline accuracy of high-precision GNSS receiver is lower, which is not in line with the relevant requirements of outdoor baseline long measurement transmission system in China. Through the outdoor baseline consistency comparison experiment, this paper conducted an indepth study on the measurement of high-precision GNSS receiver, in order to continuously improve the length measurement value transfer system for beneficial exploration
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