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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 differientiating 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.
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