Assertion: sonar | /r/ObjectUse | used in air
Facets:
value: for robot navigation
type: PURPOSE
Source sentences:
text: Sonar may also be used in air for robot navigation, and SODAR is used for atmospheric investigations.
text: For this reason, sonar was used in the air prior to the use of radar.[ii]
text: Even though it's preferred for underwater sensing, sonar can still be used in air; however, there exists the small chance of interference, which we might see when measuring distance.