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Doppler radar

A type of radar that bases its operation on the doppler effect, or the variation of the frequency of the radio wave transmitted and reflected by a piece of furniture, according to the speed of the last one. In sorting station, a system used to detect the speed of the “launched” wagons (see Launch saddle), and depending on this modulate the action of the braking system on the tracks of the arrival beam

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WikiRail

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