This should provide the reader with enough context to understand the display given our comments earlier. The following provides a brief walk through to orientate a reader on what Cees Bassa’s Satellite Tools Radio Frequency (STRF) displays as a result of a Doppler analysis of a signal. If you have a list of known satellites in known orbits you can compare that list to the data you collect to find the best match too.Īll that is going on is systematically observing the change in frequency of the satellite’s radio emissions and then comparing that to a large number or educated guesses to find the best fitting guess to the data. Therefore, if you know about how your moving and have observed data from the satellite’s radio transmitter you can compare this to a large number of guesses about the orbit it’s in and find matches that best fit the orbit. These orbits are periodic and predictable. Instead of tracks they have orbits in which they are locked into by the force of gravity. Instead of whistles the satellites have radio transmitters. This is what we are doing to track satellites with the Doppler effect. Using this knowledge one could use the Doppler effect to map out the train’s trajectories as they pass and determine which are which especially if they follow schedules and are on predefined routes. If you really pay attention you will notice the pitch of all the trains coming and going is different depending on their orientation to you, their speed and even if you decide to walk around the station and move yourself. As almost everyone has experienced the pitch of the whistles note will change based on the change in velocity of the train as it passes you by. Some are moving fast some slow all going in different directions. Further imagine you are listening to the whistles of all these trains passing through the station. East, West, North, South and even up into the sky and down into the Earth. So how does this apply to observing satellites? Imagine you are at a very large train station that has an infinite number of tracks coming and going from the station in all directions. If the objects where moving apart then the opposite happens and the wavelength increases. If they are moving toward each other the wave crests successively arrive earlier thereby decreasing the wavelength observed. Essentially when things are moving their movement effects how the waves of radiation arrive at the observer. When something emits electromagnetic radiation and is moving relative to an observer the observed wavelength of the emitting radiation will be different. Read more : Understand Doppler Analysis What is the Doppler Effect? The concepts can be a bit intimidating to understand but with a little explanation it’s accessible to anyone. We often post data online showing the results of a Doppler analysis.
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