Doppler shift

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Noun1.Doppler shift - change in the apparent frequency of a wave as observer and source move toward or away from each other
propagation - the movement of a wave through a medium
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References in periodicals archive ?
The skin's vibration amplitude and frequency, resulting from the heart beat, are extracted from the Doppler shift of the reflected beam.
Which is Delay Spread that causing signal power to be weakened and InterSymbol Interference (ISI), Doppler Spread that causing signal power to be weakened, and Doppler Shift that causing frequency signal wave to be changed or distorted.
To fully characterize the signal spectrum after the Doppler shift, the bandwidth of the designed signal B is chosen as half of the sampling frequency [f.sub.s].
If a Doppler shift is simple and known, Doppler compensation would be perfectly performed by the incorporation of resampling and CFO correction.
S/D ratio is an index of pulsatility defined as ratio of the maximum (usually peak systolic) to the minimum (usually end diastolic) Doppler shift frequencies.
Kong, "Doppler shift removal based on instantaneous frequency estimation for wayside fault diagnosis of train bearings," Journal of Vibration and Acoustics, vol.
The Doppler power spectrum, mean Doppler shift, and RMS Doppler spread of the two frequencies are given in Figures 14 and 15.
Thus, under these assured conditions including assured system bandwidth, assured total number of carriers, and assured number of uplink access of users, the greater the elevation differences between access mobile users, the greater Doppler shift differences between access mobile users, the more serious multi-user access interference for satellite to ground uplink systems.
Additional information about the object, such as its velocity or material composition, can also be determined by measuring certain properties of the reflected signal, such as the induced Doppler shift.
Dave said, "To our astonishment and exquisite pleasure on 2 December 1957, we heard and tape recorded the Doppler shift as it varied in pitch from near-zero frequency when it was pointed crosswind, to high frequencies when it was pointing either up- or downwind." This set the stage for several decades of Doppler radar research and development, and ultimately operational applications.