The high, barbed-wire fence was small protection last week against the drift of fine snow across Indianapolis' icy airport. The fence was no protection against questions, either. But it served notice that CAA's Ground Controlled Approach (G.C.A.) equipment, housed in a chunky Army truck and trailer, was still a military secret.
Essential details of G.C.A. and its operation are available in the current issue of the Bendix Radio Engineer, a quarterly published by one of the equipment manufacturers.
G.C.A. is a fairly complicated radar system for guiding aircraft in for blind landings. It was a wartime development of the famed M.I.T. Radiation Laboratories....
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