echo ranging echo rangingdetermining the distance to an object by measuring the time between transmitting a sound signal and hearing its echo. Related Articles: The First Practical Uses of Underwater Acoustics: The Early 1900sWorld War I: 1914-1918Between World War I and World War II: The 1920s and 1930sWorld War II: 1941-1945Using acoustics to explore the unknown oceanSONAR EquationDetection Threshold for Sonar Chris Knowlton2018-06-13T13:11:52-05:00