printFrom "NORAD Underground COC: Initial Requirement to Initial Operation, 1956-1966"
by kleinbl00
Caption: "SPACE BROWNIE - The most sensitive and precise satellite-tracking instrument in NORAD's satellite detection and tracking network is the Baker-Nunn camera, shown here. It can photograph light reflected from an object the size of a basketball out in space about 25,000 miles. This camera, at Cold Lake, Alberta, is operated by the Canadian Forces Air Defense Command. Others supplying data to the NORAD Space Defense Center in Colorado are operated by the U.S. Air Force and the Smithsonian Astrophysical Observatory. By identification and correlation of known star backgrounds in the Baker-Nunn photographs, a satellite's position can be determined with great precision."
francopoli