What Goes Around Comes Around
My first job out of college (1976) was working in the military defense industry at General Electric in Utica, NY. I was doing some electronics testing for a down-looking radar system to allow missiles to fly autonomously to a target. Some of that technology was used in the early 90’s in a war we had where some may remember video of a bomb finding a chimney and going down it. A key to that technology was an a priori map of the terrain that allowed the radar to correlate what it was seeing live with what had previously been recorded by some other means.
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Source:: http://fleetowner.com/technology/what-goes-around-comes-around-0