Even though radar uses electromagnetic waves to detect objects, the same principle has been used with other propagating waves, most often sound waves. While a well-known use of this is sonar ...

Regent Craft secures a contract from the U.S. Marine Corps to advance high-speed, radar-evading electric seagliders for ...

Sonar, a cousin to radar ... using NEXRAD with the goal of estimating the number of birds in flight. On the radar screen, their departures could be seen as a roughly circular accumulation that ...