HAMILTON: TIME VARIATIONS OF SOUND SPEED OVER LONG PATHS IN THE OCEAN 



In Other words, could you simply measure statistics at the end points, 

 or do you really need measurements throughout the entire path? 



Mr. Hamilton: Are you asking whether one could take statistics 

 at the source and at the receiver and compute the average transmission 

 velocity? 



Dr. Moseley : No, compute the statistics of the variability of 

 the average travel velocity. 



Mr. Hamilton: Yes. However, in this problem statistics don't 

 help very much since the problem was: What is the actual range from 

 the launch pad to the impact point expressed as a deterministic, 

 accurate value? If the speed variation over that thousand-mile path 

 were plus or minus a foot and a half per second, it would equate to 

 a location uncertainty path of 1,800 feet. So we really weren't 

 interested in the statistics. We had to have as accurate a value 

 as we could at the time. 



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