Two-Laser Optical Distance-Measuring Instrument that Corrects for the Atmospheric Index of Refraction

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Abstract
The Wave Propagation Laboratory of the Environmental Research Laboratories of the National Oceanic and Atmospheric Administration has been engaged in the development of dual-wavelength, optical distance-measuring instruments. Recently a new generation of this type of high-accuracy instrument has been completed. Preliminary testing of the new instrument indicates that the original goal of the project, accuracy of better than one part in a million over distances of 5–10 km using averaging times of less than 1 min, is being met. This paper describes the instrument and preliminary test results.