By Raymond L. Bisplinghoff, Holt Ashley, Robert L.Halfman
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Only in doing so can the data it is collecting—whether pictures of celestial objects or television broadcast signals—be transmitted, received and used on the ground. This data, reduced into useful information by computers and electronics on the ground, enable the user here on Earth to analyze data from space. In the case of human spaceflight, the stakes are much higher. A failed communications link potentially compromises not just the success of a mis sion but also puts the lives of astronauts at greater risk.
The antenna was moved from its original Honeysuckle Creek site some 30 kilometers (20 miles) away in 1985. Clearly visible are the two large yokes which allow the antenna to be moved in two “X-Y” axes as it tracks a spacecraft. (Photograph by the author) of ownership to become partners in the space effort. This “nationalizing of the stations” from the early days of the network would leave an indelible legacy around the world that continues even today. Such international cooperation could in fact make or break a sta tion.
Knowing that electromagnetic waves propagate at the speed of light, measurements of the different arrival times of the waves, called phase differences, can then be used to calculate position solutions for an object. This technique had the advantage of yielding highly accurate tracking angles and could be used under virtually any atmo spheric condition, even underwater. Given its potential, a number of groups were involved in its research after World War II. S. Army on the Azusa missile tracking system.
Aeroelasticity by Raymond L. Bisplinghoff, Holt Ashley, Robert L.Halfman