>>17316976I'll help you out a little bit since this is almost correct.
>The missile knows where it is att 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>It obtains a different sort of deviation, the guidiance subsystem uses deviation 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 know 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 aquired 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 to may be corrected by the gea, however, the missile must also know where it was.>The missile guidence computer scenario works as follows:>Because of variation have 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 it's variation, which is called:Air.
