Doppler-aiding [GPS]—A signal processing strategy that uses a measured Doppler shift to help the receiver smoothly track the GPS signal. Allow s more precise velocity and position measurement.

Doppler radar-1 An instrument which determines the radial velocity of an object by comparing the frequency of radiation returned from an object with the frequency of radiation transmitted toward the object.

Doppler shift [GPS]—The difference between the frequency of radiation received at a point and the frequency of the radiation when it was emitted, when observer and source are moving with respect to each other. Thus, it is a comparison between different epochs.

Doppler surveying—Determining the coordinates of points on the Earth, or the angles and/or distances between these points, by measuring the Doppler shift in the radio waves emitted by a satellite whose orbit is known; Doppler tracking.

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Source: NSPS “Definitions of Surveying and Related Terms“, used with permission.

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