This phenomenon also has detrimental effects on moving target indicator systems, where the detection scheme subtracts signals received from two or more transmit pulses.
Scalloping occurs when the radial velocity of the reflector induces an odd integer multiple of a 360 degree phase shift between two or more transmit pulses.
Scalloping for pulse-Doppler radar involves blind velocities created by the clutter rejection filter.
The blind velocity for a specific pulse repetition frequency (PRF) is an integer multiple of the following, which causes the signal to have zero doppler.
Moving target indicator (MTI) radar reduces the impact of blind velocity by using redundant detectors that introduce a compensating reverse phase shift undoes the phase shift caused by Doppler from reflector motion.