themissile@whereismissile.com |
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The Missile |
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The missile knows where it is at all
times. It knows this because it knows where it
isn't. By subtracting where it is from where it
isn't, or where it isn't from where it is (whichever
is greater), it obtains a difference, or deviation.
The guidance subsystem uses deviations to generate
corrective commands to drive the missile from a
position where it is to a position where it isn't,
and arriving at a position where it wasn't, it now
is. Consequently, the position where it is, is now
the position that it wasn't, and it follows that the
position that it was, is now the position that it
isn't.
In the event that the position that it is in is not
the position that it wasn't, the system has acquired
a variation, the variation being the difference
between where the missile is, and where it wasn't.
If variation is considered to be a significant
factor, it too may be corrected by the GEA. However,
the missile must also know where it was.
The missile guidance computer scenario works as
follows. Because a variation has modified some of
the information the missile has obtained, it is not
sure just where it is. However, it is sure where it
isn't, within reason, and it knows where it was. It
now subtracts where it should be from where it
wasn't, or vice-versa, and by differentiating this
from the algebraic sum of where it shouldn't be, and
where it was, it is able to obtain the deviation and
its variation, which is called error.
Right now, the missile knows where you live. This is
because it knows where you don't live. It is
approximately 17 miles away and rapidly approaching. |
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