Word: doppler
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Dates: during 1960-1969
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...value as a deterrent against war is obvious. The Navy's Transit I-B is the exciting prototype for a system that will give the U.S. an all-weather navigational accuracy unmatched in human history. Developed by a pair of young Johns Hopkins scientists who studied the radio Doppler effects of Russia's Sputnik I and applied them to practical purposes, the Transit system is scheduled to have four satellites in orbit by 1962. They should be able to give every spot on earth a navigational fix, accurate to the quarter mile, every 90 minutes. Any ship with...
...Doppler Effect. Lofted by an Air Force Thor-Able-Star rocket. Transit I-B slanted around the world from 51° N. to 51° S. and settled into an elliptical orbit (apogee, 475 miles; perigee, 235 miles), sending radio signals from the moment it left the pad. From Texas to Hampshire, England, tracking stations sent information to a computing center near Washington, D.C. In future models, orbit-predicting data will be quickly rebroadcast to the satellite, which will remember its daily itinerary on magnetic tape, constantly announce it from space (the day-to-day orbital variations are minuscule...
...navigation system is a common phenomenon first articulated scientifically little more than 100 years ago, when Austrian Physicist Johann Christian Doppler noted that sound waves coming from a moving object increase in frequency as the source of the sound approaches an observer, decrease as it moves away. Thus, in what has become the standard example of the Doppler effect, a train whistle seems to rise and fall in pitch as the train goes by. Similarly, the signals from a satellite increase in frequency as they move nearer to a receiver on earth, diminish as they move on. By measuring...