Doppler radar velocity measurement
of coning bullet
This drawing qualitatively explains the results of the Doppler radar
velocity measurement for the 7.62 x 51 Nato bullet from its coning motion
on the descending part of the trajectory.
While the coning bullet moves its tip towards the antenna, a
velocity component subtracts from the radial velocity of the CG
(the antenna "sees" an approaching bullet axis plus a withdrawing
CG) and while the bullet´s tip withdraws from the antenna, a velocity
component adds to the radial bullet velocity (the antenna "sees"
a withdrawing bullet axis plus a withdrawing CG).
Thus, the oscillating nature of the measured velocity (see figure )
results from a superposition of the coning motion of the bullet´s
longitudinal axis and the displacement of the CG along the trajectory.
  
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