The phase retrieval of quiet zone in CATR with G-S algorithm

A phase retrieval algorithm called Gechberg-Saxton(G-S) algorithm combined with weighted amplitude is proposed and simulated in this paper. It is difficult to scan the quiet zone using probe to get the accurate phase at high frequency due to the cable. So the algorithm to retrieve phase from amplitude-only data is helpful to measure the quality of the quiet zone. We take two surfaces amplitude-only data at space domain using angular spectrum propagation theory to iterates between two parallel surfaces. $\varphi=0^{\circ}$ and $\varphi=90^{\circ}$ at the first surface is chose to show the fitting degree between the simulated phase from GRASP and the phase retrieved from matlab. The max error is 3.6 degree.