The specific dependence of the properties of a cw Doppler ultrasonic scattered signal, and of its autocorrelation and spectral density functions, on various scatterer flow parameters and diagnostic signal beam parameters is shown. These factors include the scatterer average velocity profile and the extent of any turbulence together with the signal beam angle and beam width.Subject Classification: [43]30.40; [43]35.65; [43]20.15, [43]20.30.