Title :
Target velocity estimation with FM and PW echo ranging Doppler systems. II. Systems analysis
Author :
Wilhjelm, J.E. ; Pedersen, P.C.
Author_Institution :
Worcester Polytech. Inst., MA, USA
fDate :
7/1/1993 12:00:00 AM
Abstract :
For part I see ibid., vol.40, no.4, pp.366-372 (1993). In Part I, the encoding of the velocity and range information into the received and demodulated signals based on transmission of coherent repetitive linear sweep signals, was discussed. In the present work, two different implementations of FM Doppler systems that can be used to obtain velocity profiles are presented. The first implementation is similar to the implementation of a conventional pulsed wave (PW) Doppler system, based on measurement of phase shift (correlation based system): the second implementation is a frequency-domain analog to the PW Doppler system, based on time shift measurements (cross correlation-based system).<>
Keywords :
Doppler effect; acoustic signal processing; biomedical equipment; biomedical measurement; biomedical ultrasonics; correlation methods; flow measurement; flowmeters; frequency modulation; haemodynamics; medical signal processing; FM Doppler systems; biomedical US; blood flowmeter; blood velocity measurement; correlation based system; cross correlation-based system; echo ranging Doppler systems; frequency-domain analog; pulsed wave Doppler system; target velocity estimation; time shift measurements; Acoustic transducers; Biomedical measurements; Frequency measurement; Phase measurement; Pulse measurements; Signal analysis; Signal resolution; Time measurement; Ultrasonic transducers; Ultrasonic variables measurement;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
