Abstract
In recent years various instruments and techniques have been developed for measuring distances electronically. The accuracy of such measurements depends on the accuracy with which time and the velocity of propagation of radio waves can be determined. The National Bureau of Standards, under the sponsorship of the Air Force Ballistic Missile Division, has been studying the effects of atmospheric turbulence on the performance of radio distance- and/or velocity-measuring systems. Many of the data collected in this study are applicable to the problem of determining the accuracy of radio surveying methods, Longterm variations in the apparent length of a 15.5-mile path in Hawaii are shown, along with the effects of correcting for the atmospheric refractive index observed at 2 to 5 points along the path.
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