how do radar altimeters works?

Radar altimeters work by emitting radio waves towards the ground and measuring the time it takes for the reflected waves to return to the device. By calculating the time delay between transmission and reception, the altimeter determines the distance to the ground. This distance is then converted into altitude information, which can be used in various applications such as aviation, satellite navigation, and terrain mapping. The system is particularly effective in providing accurate altitude readings in various weather conditions.