Word: dopplered
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...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...
...undersea-photography expeditions to the far ends of the earth. He sounds thoroughly convincing when he writes, at a moment of high dramatic intensity (a star is blowing up): "Those last exposures did it! ... They show the gaseous shell expanding round the nova. And the speed agrees with your Doppler shifts." His characters may seem as standard as those in any war film (his monsters, though, are quite human), but most science-fiction writers proceed on the assumption, probably correct, that one man's neurosis, however interesting, is not very significant when the solar system he inhabits is about...
...Combat Surveillance Radar AN/TPS-25 (called Tipsy 25 by the G.I.s) is easily mobile, depends on the Doppler effect, which detects slight movements toward or away from the instrument because of the change in frequency of radio waves reflected from moving objects. When set up on the front line, Tipsy 25 is trained toward the direction of probable enemy approach. It covers an angle of about 30°, and if anything is moving there, the operator hears a crackling sound like radio static. He then narrows his beam and focuses on the suspected object. When he pinpoints it. he hears...
...DOVAP-Doppler Velocity and Position...