Velocity from corrected Doppler bandwidth - a simulation study

Use of the Doppler spectrum width, when this is dominated by intrinsic spectral broadening, has been proposed as a means to determine velocity magnitude when the Doppler angle is unknown. Correction of the measured spectral width for the effects of velocity range within the sample volume (SV), window broadening and acceleration broadening in order to extend the conditions under which this method may be used has been explored. A correction method using a simple approximate expression for rms spectral width together with three sample volumes to measure velocity shear and three windows to measure acceleration has been tested by computer simulation and found to improve velocity estimation from spectral width.