I see .. I understand you as if there is some way to determine distance from doppler alone.
To get speed 'in-line' you have to know 'no Doppler' frequency of the line you are looking at right ? If targets makes circle, it's the middle frequency. Simple. But what if the target does not make the circle ?
How many NB lines are known to be fixed and their frequency is know exact enough ? If I understand it correctly, there is not so many of them as in DW (where all are fixed). Many of the lines are machinery based and these change with RPM of corresponding parts.
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