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Doppler Radar

My science project about the past, present, and my prediction as to the future of Weather Doppler Radar.

frankie wallace

on 17 May 2010

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Transcript of Doppler Radar

Weather Doppler Radar Everything in the following presentation is made possible by the doppler effect. The Doppler effect is the apparent change in the frequency of a wave caused by relative motion between the source of the wave and the observer. Without the Doppler Effect, radar wouldn't exist and we wouldn't have radio, radar guns, or a scientific way of predicting weather. The Doppler Effect Now to my main topic Radar Guns
In this radar system, Electromagnetic radiation waves are sent toward a moving object. Because of the Doppler Effect, these waves bounce back at the source (your radar gun,) at a different velocity than before. This is most commonly used by police to catch speeders. The gun monitors the waves to track the difference in frequency, thus obtainig enough information to display the speed of the other vehicle. Pulse (weather) Doppler Radar This doppler radar system allows not only the determination of linear velocity, like the radar guns, but also radial velocity. It does this by sending pulses. Basically, the waves sent out by the doppler radar system bounce off of precipitation, then bounce back to a computer, producing an image. Meteorologists then study these images to determine the pattern in which the weather is moving, and how it will be once it reaches a certain area, which is how we are able to predict weather today. History of Doppler Radar Some uses for radar In the early 1920's, Dr. A. Hoyt Taylor first theorized the use of pulse doppler radar. His studies led to the creation of the first pulse doppler radio wave system in 1935 by Robert Wilson-Watt. This system was initially used in World War II in order to gain an advantage against enemies. In the 1950's the original weather service was deployed, mainly used for tracking tornadoes. What is the future of Doppler Radar? In the field of pulse doppler weather prediction, there is very little room for improvement. The fact is,sometimes weather changes so fast that it is unpredictable. If weather weren't so quick changing, the weatherman would never be wrong. But since we can't control mother nature, the only improvement that I see in the future of pulse doppler radar, are computerized meteorologists to calculate the results. this would reduce the possibility of human error, though that isn't a large problem. Radio Radio was the initial use for radar. Radio waves are sent out, and picked up by antenas (discovered by Heinrich Hertz.) The change in frequency produces the sound that we hear out of the radio speakers. What does R.A.D.A.R stand for? Radio
Ranging History of weather prediction In the early years of weather prediction, people studied the stars to conduct predictions as to the weather. Then people started studying cloud formations, and came up with their own theories, like the theory of number weather prediction. Over the years many people even began to believe that some animals like cows, could naturally predict storms. It wasn't until the early 1920's, that a more reliable method was thought of. My sources www.windows2universe.org
google images
Frankie Wallace yes THE END
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