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Daniel Prates · 05-04-12, 02:41 PM

I think that TMA is only possible when you can correctly estimate the target's speed. Then you compare multiple bearings over a period of time, and 'fit' both data (bearings and speed) into one coherent result. If you only have the bearings, his range (and relative course too) are impossible to estimate.

So the thing is to estimate speed via some reliable source. The way I see it, the mode of choice in the last decades is TPK (turns per knot), a thing you only can use if at the same time you can also classify the target, all of that presuming you know the TPK ratio for it- a not so easy thing to do with 1940s sonar gear and intel.

05-04-12, 02:41 PM	#10
Daniel Prates Grey Wolf Join Date: Apr 2011 Location: Curitiba, Brazil Posts: 938 Downloads: 65 Uploads: 0	I think that TMA is only possible when you can correctly estimate the target's speed. Then you compare multiple bearings over a period of time, and 'fit' both data (bearings and speed) into one coherent result. If you only have the bearings, his range (and relative course too) are impossible to estimate. So the thing is to estimate speed via some reliable source. The way I see it, the mode of choice in the last decades is TPK (turns per knot), a thing you only can use if at the same time you can also classify the target, all of that presuming you know the TPK ratio for it- a not so easy thing to do with 1940s sonar gear and intel.