Presently, the TMA solution feature built into MoBo is fairly simple.
(Have you tried it?)
You take regular bearings at even intervals and from that you can lay a TMA line across the bearings and look for a heading that yields equal distance travelled. Of course, that assumes the target has not changed course or speed.
In MoBo, the TMA line is positioned by human intervention, similar to the way a maneuvering board user would use a ruler with speed notches.
I'm in the process now of researching new and more advanced methods for TMA. Someone mentioned possibly looking into Ekelund ranging as well.
My first challenge was to revamp my vector intercept formula to test for actual line intersection. I think I have something now that can properly differentiate between intercepts (assuming lines extend to infinity) and intersections (finite lines) or any combination of the two.
I believe a least squares solution would require some sort of range estimate, correct?