Doppler effect have an impact depending on the course of the target relative to your position.
In simple words : if the target is going away, her frequency spectrum will be a bit higher than if the target is heading perpendicular to your position.
On the opposite, if the target is going away from you, her frequency spectrum will be a bit lower than if the target is heading perpendicular to your position.
the immediate information a doppler shift could give you for a target, is if this target (after beeing identified) is going toward (higher frequencies), perpendicular (normal frequencies) or away (lower frequencies) from you.
But about finding a speed with a doppler shift on target frequency will be MUCH MORE difficult than to use a simple TMA.
As said compressioncut, to use calculations based on doppler shift will need to double the size of the manual.
Doppler is only used as range finder for distant galaxies, because the expansion factor is already estimated.
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