# What is doppler tolerance

Can anybody explain the meaning of Doppler tolerance for the waveforms(Linear frequency modulated, Barker code, Polyphase codes) used for Pulse compression.

The Doppler frequency shift $f_{d}$ due to a moving target of velocity $v_{r}$ is given by

$f_{d} = 2*v_{r}/\lambda$ where $\lambda$ is the wavelength of the transmitted signal.

Polyphase codes are known to be having high Doppler tolerance compared to LFM waveforms. Can anybody explain this fact in simple terms.