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
References in periodicals archive ?
Here we further analyse the Dai data and extract the RA and Dec of that preferred direction, and relate the data to previous determinations from NASA spacecraft Earth-flyby Doppler shift data, and other determinations [5].
Up until now, Cospas--Sarsat has relied on satellites in low and high orbits, but medium orbits with satellites such as Galileo are better for search and rescue purposes; they combine a wide field of view with strong Doppler shift, making it more likely a distress signal is pinpointed promptly and accurately," says Fermin Alvarez, ground station and fielding engineer with ESA.
The subject of the contract is a LIDAR wind instrument based on the Doppler shift and the use of a pulsed laser.
Lu et al (2010) proposed an algorithm known as D-Sync, leverages the Doppler shift in underwater environment to do time synchronization.
In particular, many consider the significance of Vesto Melvin Slipher's 1912 astrometric research at the Lowell Observatory on Doppler shift in a spiral nebula.
It leverages the property of the Doppler shift, which is the change of a wave as its source moves relative to the observer.
Doppler shift caused by skin acceleration was recorded during each procedure.
Among the non-invasive and instantaneous methods, the Laser Doppler Velocimetry (LDV) in which velocity is measured using the Doppler shift of the laser beams crossing the flow field, is the most common method used in velocity measurements of the complex flows.
The position of a non-GPS equipped EPIRB is established by using Doppler shift as the satellite passes over the broadcasting EPIRB.
He begins with special relativity, including Lorentz transformations and the Doppler shift.
As an example of what becomes possible, French amateur Christian Buil was able to use the new spectrograph to measure the tiny Doppler shift produced by the planet orbiting Tau Bootes from his urban apartment balcony.
For example, if an airplane flying over a humvee was transmitting signals to the ground, the link would be affected by high Doppler shift rates and varying range delays that the humvee's receiver would need to track.