by PeOe on 11/30/18, 9:35 AM with 28 comments
by yholio on 12/1/18, 9:06 PM
Essentially, open market spooks for hire, selling limited space intelligence to countries that can't afford their own space programs.
by crooked-v on 12/1/18, 9:22 PM
by closeparen on 12/1/18, 9:37 PM
by Bucephalus355 on 12/2/18, 12:43 AM
There has been a good amount of progress, but it really stalled for a while when ICBMs seemed to negate the importance of aircraft. The US had the quite sophisticated Northern Early Warning Line at one time to monitor all airspace in the North Pole. It’s very hard, even today, to get good satellite tracking there because it is a Pole.
The craziest thing I’ve heard is what the British tried before radar was invented. A Hoover Dam like wall 200 feet high that was supposed to amplify the sounds of planes approaching from Germany that would alert a human operator.
http://www.andrewgrantham.co.uk/soundmirrors/locations/denge...
by clubm8 on 12/2/18, 3:59 AM
by ridgeguy on 12/2/18, 4:07 AM
Comm signals at, for example, 3.5MHz wouldn't get through the ionosphere.