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Although pulsed Doppler radar systems are widely used, ultrasonic pulsed Doppler systems which are potentially useful for flow measurement in liquids carrying sound scatterers (such as blood) have been limited in their useful range to a few centimeters due to range-ambiguity problems. An ultrasonic random-signal flow measurement system is described which is shown to have no range ambiguity and to be able to transmit continuously, thus having a low peak to average power ratio. Experimental data from a working random-signal system are: presented demonstrating its advantages over conventional pulsed Doppler systems. The system should be useful for many large-scale flow applications, ranging from measurements in deep-lying blood vessels to wake measurements around ships.
Bendick et al. (Sun,) studied this question.