A short pulse of radio waves is transmitted and the time it takes for the reflection (the echo) to return is measured. The distance is calculated using distance = speed x time. As with sonar ...

They estimated the weights of observed falling stars based on their brightness levels and speeds, and combined the data with the radio wave reflection intensity measured by the MU atmosphere ...

Carrier Wave Generator The Wave Generator creates a high-frequency radio signal. The frequency of this signal is many times greater than the frequency of the audio wave. This signal will "carry ...