ess (phil hunt) wrote:

:On Fri, 19 Dec 2003 19:05:46 GMT, Derek Lyons wrote:
(phil hunt) wrote:
:
: DR is a non-starter--again, you don't just hurl a few
:missiles in the general direction of the bad guys and say, "Gee, that was
:tough--time for a beer!"
:
:Again, why would DR not work?
:
:Because all navigation system accumulate inaccuracy as time-of-flight
:increases.
:
:Well, that's obvious. it's how quickly it accumulates innaccuracy
:that matters.

And cheap IMUs accumulate them MUCH more quickly.

: Without periodic updates, you are almost ensured of
:failing to hit your target.
:
:Unless you have some other method of terminal guidance.

And you know where you are and where the target is in relation to you
well enough to get your sensor pointed in the right direction so that
the target falls within your FOV. This is difficult to do with a
GPS-precision weapon. Doing it flying pure inertial? BWAAAHAAAHAAA.

--
"Millions for defense, but not one cent for tribute."
-- Charles Pinckney