"Distances Optical measurements." . . "Optical ranging." . . "Institute for Telecommunication Sciences." . . . . "United States. Environmental Science Services Administration." . . "Radio distance-measuring." . . "Radio waves Optical devices." . . "SHIRAN." . . . . . . . . . . . . . . . . . . . . . . . . . "Technique for improving the accuracy of air-to-ground radio distance measurement systems"@en . "Technique for improving the accuracy of air-to-ground radio distance measurement systems" . . . .