ANALYTICAL AND EXPERIMENTAL COMPARISONS BETWEEN THE FREQUENCY-MODULATED-FREQUENCY-SHIFT MEASUREMENT AND THE PULSED-WAVE-TIME-SHIFT MEASUREMENT DOPPLER SYSTEMS
Je. Wilhjelm et Pc. Pedersen, ANALYTICAL AND EXPERIMENTAL COMPARISONS BETWEEN THE FREQUENCY-MODULATED-FREQUENCY-SHIFT MEASUREMENT AND THE PULSED-WAVE-TIME-SHIFT MEASUREMENT DOPPLER SYSTEMS, The Journal of the Acoustical Society of America, 100(6), 1996, pp. 3957-3970
In previous publications, a new echo-ranging Doppler system based on t
ransmission of repetitive coherent frequency-modulated (FM) sinusoids
in two different implementations was presented. One of these implement
ations, the frequency-modulated-frequency-shift measurement (FM-fsm) D
oppler system is, in this paper, compared with its pulsed-wave counter
part, the pulsed-wave-time-shift measurement (PW-tsm) Doppler system.
When using transmitted PW and FM signals with a Gaussian envelope, the
parallelism. between the two systems can be stated explicitly and com
parison can be made between the main performance indices for the two D
oppler systems. The performance of the FM and PW Doppler systems is ev
aluated by means of numerical simulation and measurements of actual fl
ow profiles. The results indicate that the two Doppler systems have ve
ry similar levels of performance. (C) 1996 Acoustical Society of Ameri
ca.