The rate of departure, or closing, of a target relative to the radar antenna at which cancellation of the primary radar target by moving target indicator (MTI) circuits in the radar equipment causes a reduction or complete loss of signal. In MTI or pulse Doppler radars, radial target speeds that result in the target range changing by multiple half-wavelengths in the interval between the pulses. Under these conditions, the target is invisible to the radar. Also called blind velocity.
The question was unexpectedly and suddenly answered for her, by the colourless boy, Bitzer, who came round the corner with such blind speed and so little anticipating a stoppage on the pavement, that he brought himself up against Mr.