Iterative Equal-scale Defocused Frequency Domain Stitching Phase Retrieval Techniques Based on the Phase Transfer Function

This article provides an iterative equal-scale defocused Frequency domain stitching phase retrieval technique based on the phase transfer function (IEDFS-PTF). This technique can be utilized for single-beam phase recovery environment of the terahertz compact antenna test range and other phase retrieval scenarios with drastically changing phase distributions. IEDFS-PTF is obtained by combining the equal-scale defocused Frequency domain stitching phase retrieval technique (EDFS-PTF) with the multi-plane angle spectrum iteration technique. In the presence of noise, IEDFS-PTF has a better recovery effect than the traditional multi-plane phase retrieval technology. Compared with EDFS-PTF, angular spectral iterative technique has no approximate and omitted operations, but traditional iterative techniques inevitably converge to a partial minimum. IEDFS-PTF combines angular spectrum iteration and EDFS-PTF to successfully suppress the drawbacks of both. The simulation results show that even when the phase distribution varies drastically, the phase root-mean-square error remains below 0.05 until the noise standard deviation exceeds 0.06.