In article ,
Derek Lyons wrote:
The dominant method is radio tracking... These measurements
are combined using a sophisticated estimating process...
Some other techniques sometimes get added...

Damm - it's amazing how close that description is to the methods we
used to track targets using sonar. (Though our targets were usually
assumed to be non-cooperative.)

Somewhat the same problem, of course, apart from whether the target is
trying to help. There may well have been some cross-fertilization on
methods -- probably mostly from NASA to the USN, given the security issues
for information traveling the other way. NASA threw money at these issues
in the early 60s, around the time when the USN was starting large-scale
deployment of gear intended to counter Soviet nuclear subs, including the
beginnings of sophisticated sonar, so the time scale was about right.
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