"Maybe the units in question included export controlled items like FLIR cameras? 

Certainly they should have gone through the proper channels to export.  They definitely should not have tried for round two, though I wonder if the intent of that trip…"

"2008 is the date to be concerned with.  Anything after the filing date cannot be claimed for prior art.  Anything after the grant date can be contested.

This patent must have been amended at some point.  The description talks about coaxial, but the…"

"I'm not sure if you're aware of this or not, but this design has been patented by another company.  Are you licensing this design?
https://www.google.com/patents/US8292215"

"Bill,
Thanks for the thorough reply.  So it seems like I had it right all along, I just wasn't aware of the various scaling factors at play.  I'll play with it some more, I think doing some simple things like keeping a back buffer of fields and…"

"I just came across this.  Interesting stuff, I just had to try it. I collected magneto data from a flight sim and used matlab to test the algo.  It works, but has a problem.
For testing purposes I added arbitrary offsets to the fields before…"