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Refinement of the Metrological Chain for Calibration of Long-distance Measurement Systems

A new concept for the standardization structure of long-distance measurements is proposed. It is based on using absolute laser interferometry for transfer of the length unit to a base-line of 1 km length. The use of an evacuated interference base-line makes it possible to create a standard base-line of the highest accuracy, reliably connected with the common frequency-time-length standard. The base-line length may be extended by means of precise two-wavelength optical range finders correcting for the atmospheric index of refraction.