The Missile Knows Where It Is... (But Not WHY It Is) - AEIOU.mp3
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[00:00.000] 作词 : United States Air Force[00:01.000] 作曲 : Dillon Moore[00:03.594]The missile knows where it is at all times.[00:06.331]It knows this because it knows where it isn’t.[00:09.339]By subtracting where it is from where it isn’t,[00:12.211]or where it isn’t from where it is (whichever is greater),[00:15.486]it obtains a difference, or deviation.[00:18.513]The guidance subsystem uses deviations to generate corrective commands[00:23.071]to drive the missile from a position where it is to a position where it isn’t,[00:27.588]and arriving at a position where it wasn’t, it now is.[00:32.080]Consequently, the position where it is, is now the position that it wasn’t,[00:37.138]and it follows that the position that it was, is now the position that it isn’t.[00:41.852]In the event that the position that it is in is not the position that it wasn’t,[00:46.987]the system has acquired a variation,[00:49.523]the variation being the difference between where the missile is, and where it wasn’t.[00:54.332]If variation is considered to be a significant factor,[00:57.795]it too may be corrected by the GEA.[01:02.649]However, the missile must also know where it was.[01:06.322]The missile guidance computer scenario works as follows:[01:10.269]Because a variation has modified some of the information the missile has obtained,[01:15.280]it is not sure just where it is.[01:18.035]However, it is sure where it isn’t, within reason, and it knows where it was.[01:23.088]It now subtracts where it should be from where it wasn’t,（or vice-versa，）[01:27.390]and by differentiating this from the algebraic sum of where it shouldn’t be, and where it was,[01:33.164]it is able to obtain the deviation and its variation,[01:37.852]which is called[01:41.030]E R R O R
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