Abstract: In order to simplify the calculation, elliptic Gaussian model for reflection-type optical antenna was proposed to describe localized deformation, based on which, taking reflection-type receiver antenna for example, the effects of localized deformation on acquisition error was researched. The results of analysis and numerical simulation show that the acquisition error depends on the following parameters: deformation radius, deformation depth, and the deformation distance between the localized deformation and the beam center. The acquisition error increases monotonously as the distortion radius, depth and the distance rise. With the increment of the distortion depth, the acquisition error fluctuates periodically like damped oscillation, and the fluctuation period and the peak positions don’