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Originally Posted by Deathblow
OkeeDokee....Hypothetically....
That being accepted as true.... shouldn't submarines be able to deploy both their TA to eliminate bearing ambiguity?
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You're actually right on. In fact, by measuring the phase differences between corollated signals you could also determine the range. There's also some tricks to it, though.
In order for that phase difference to be measurable, you need to have the two towed arrays sufficiently separated. It's not clear to me that streaming a pair of towed arrays behind an SSN would result in sufficient separation. I suspect some other systems might use the technique. Also, signals become distorted as they travel through the water, so corrolating signals is not necessarily an easy thing to do.
They actually used to do a similar thing to what you're talking about with LOFAR sonobuoys, and use that to determine bearing and range with an omnidirectional sonobuoy. Unfortunately, the model doesn't really take that into account.