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DESCRIPTION

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, 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 that 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 that 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.

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