NDLI: Comparisons between PW Doppler system and enhanced FM Doppler system

Content Provider	IEEE Xplore Digital Library
Author	Wilhjelm, J.E. Pedersen, P.C.
Copyright Year	1995
Description	Author affiliation: Tech. Univ., Lyngby, Denmark (Wilhjelm, J.E.)
Abstract	This paper presents a new implementation of an echo-ranging FM Doppler system with improved performance, relative to the FM Doppler system reported previously. The use of long sweeps provides a significant reduction in peak to average power ratio compared to pulsed wave (PW) emission. A PW Doppler system exploits the direct relationship between arrival time of the received signal and range from the transducer. In the FM Doppler systems, a similar relationship exists in the spectral domain of the demodulated received signals, so that range is represented by frequency. Thus, a shift in location of moving scatterers between consecutive emissions corresponds to a frequency shift in the spectral signature. The improvement relative to the earlier version of the FM Doppler system is attained by utilizing cross-correlation of real spectra rather than of magnitude spectra for assessing flow velocity. This approach requires a priori knowledge of the envelope of the received sweep from a point scatterer.
Starting Page	1549
Ending Page	1552
File Size	272834
Page Count	4
File Format	PDF
ISBN	0780329406
ISSN	10510117
DOI	10.1109/ULTSYM.1995.495850
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-11-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency modulation Transducers Particle scattering Frequency measurement Time measurement Delay effects Signal processing Peak to average power ratio Blood flow Ultrasonic imaging
Content Type	Text
Resource Type	Article

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