Holographic Doppler Velocimetry using LPM pulses and linear array.

概要

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This paper is presented on a new technique for "Holographic Doppler Velocimetry". In this technique, uncorrelated Linear Period Modulated (LPM) pulses are transmitted, and velocity vectors are calculated from the digitized echo waveforms detected by receiver array.Using LPM pulses, information on positions and velocities of multiple objects is obtained with a single transmitting and receiving process, then high speed data acquisition is capable. Velocity estimating algorithm is simplified since Doppler shift is detected as phase rotation of echo.In the paper, the principle of the velocimetry is described for the system which has multiple transmitters and 1-Dimensional receiver array. Velocity estimating algorithm based on matching operation is presented.The accuracy and spatial characteristics of the velocimetry is evaluated as functions of transmitted pulse's parameters (Chirp rate, frequency band width), array size, and signal to noise ratio.The experimental results using airborne ultrasound and computer simulation show the ability of the method for 2-D velocimetry.
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