Time Frames for Negative Information. Late payments are black marks that normally stay on a credit report for 7 years. That's true of most negative information like foreclosures, Chapter 13 bankruptcies, charge-offs and paid tax liens; a Chapter 7 bankruptcy stays around for 10 years and unpaid tax liens can linger indefinitely.
Wiktionary (0.00 / 0 votes) Rate this definition: Doppler effect (Noun). The apparent change in frequency or wavelength of a wave that is perceived by an observer moving relative to the source of the waves. Origin: From Johann Christian Andreas Doppler, the scientist who first proposed this effect.
Doppler radar uses the Doppler effect to measure the radial velocity of targets in the antenna's directional beam. The Doppler effect shifts the received frequency up or down based on the radial velocity of target (closing or opening) in the beam, allowing for the direct and highly accurate measurement of target velocity. A Doppler radar is a radar that produces a velocity measurement as one of its outputs.