Radar.
Radio waves hit all obstacles the same, but the waves will differ in the distance of the wave and/or the object from the transmitter.
As time passes, the amplitude of AM radio waves is intentionally changed in order to add information to the waves that can be read at a distance.
Remote sensing
remote sensing
Radio waves are in all parts of the atmosphere. Some, but not all, radio waves are reflected from the ionosphere, permitting transmission over greater distances.
Radio waves hit all obstacles the same, but the waves will differ in the distance of the wave and/or the object from the transmitter.
As time passes, the amplitude of AM radio waves is intentionally changed in order to add information to the waves that can be read at a distance.
Remote sensing
The ionosphere is the layer of the atmosphere that reflects radio waves. This layer is able to reflect specific frequencies of radio waves back to Earth, allowing for long-distance communication using radio signals.
remote sensing
remote sensing.
Radio waves are in all parts of the atmosphere. Some, but not all, radio waves are reflected from the ionosphere, permitting transmission over greater distances.
Skip distance refers to the minimum distance at which radio waves can be reflected off the ionosphere and returned to Earth, allowing for long-distance communication. This phenomenon occurs when the frequency of the radio wave is high enough to be reflected rather than absorbed by the ionosphere. The skip distance varies based on factors such as frequency, time of day, and ionospheric conditions. It is a critical concept in understanding how HF (high frequency) radio waves propagate over long distances.
The ionosphere is the layer responsible for enabling long-distance radio communication by reflecting radio waves back to Earth. Its charged particles interact with radio waves, bending and reflecting them to facilitate communication over long distances. Without the ionosphere, radio waves would continue into space, limiting long-distance communication possibilities.
Distomat is an instrument used to measure distance using light and radio waves.
remote sensing.
Remote sensing.