How does a radar altimeter determine altitude?

How does a radar altimeter determine altitude?

• A. By calculating altitude based on air pressure
• B. By measuring distance to the nearest cloud
• C. By transmitting a signal and receiving a reflected signal
• D. By using GPS coordinates to estimate height

Answer: (C)

A radar altimeter determines altitude through the process of transmitting a radar signal toward the ground and then measuring the time it takes for that signal to reflect back to the source. This method relies on the speed of radio waves, which travel at a known velocity. By calculating the time delay between sending the signal and receiving the echo, the radar altimeter can accurately compute the distance to the ground, which corresponds to the altitude of the aircraft. This type of altimeter is particularly useful for low-altitude flight operations, such as landing and takeoff, because it provides precise measurements of altitude above the terrain. Unlike other methods that may rely on atmospheric conditions or GPS accuracy, the radar altimeter operates independently of these factors, making it a reliable source of altitude information in various environments.

A radar altimeter determines altitude through the process of transmitting a radar signal toward the ground and then measuring the time it takes for that signal to reflect back to the source. This method relies on the speed of radio waves, which travel at a known velocity. By calculating the time delay between sending the signal and receiving the echo, the radar altimeter can accurately compute the distance to the ground, which corresponds to the altitude of the aircraft.

This type of altimeter is particularly useful for low-altitude flight operations, such as landing and takeoff, because it provides precise measurements of altitude above the terrain. Unlike other methods that may rely on atmospheric conditions or GPS accuracy, the radar altimeter operates independently of these factors, making it a reliable source of altitude information in various environments.