The effects of multipath include constructive and destructive interference, and phase shifting of the signal. This causes Rayleigh fading, named after Lord Rayleigh. The standard statistical model of this gives a distribution known as the Rayleigh

移相干涉求相位，既求出基于相位偏移干涉术的初始相位值-Phase-shifting interference requirements phase, not only find the phase shift interferometry based on the initial phase value