基于GPU的961单元自适应光学系统波前处理器设计及其动态性能

Design and dynamic performance of wavefront processor for 961 element adaptive optics system based on GPU

为了满足4 m级地基大口径光学望远镜千单元自适应光学系统的波前处理规模、速度以及控制带宽要求,研究了基于GPU的千单元级自适应光学系统高速波前处理器。介绍了自适应光学系统波前处理方法,并详细论述了基于GPU的波前处理架构的实现与优化方法。最后,通过湍流模拟器进行桌面模拟实验,得到961单元自适应光学系统的动态性能。实验结果表明:基于GPU的961单元自适应光学系统在采样频率为1500 Hz时,系统0 dB残余误差抑制带宽能够达到100 Hz,满足4 m级地基大口径光学望远镜自适应光学系统的应用需求。

In order to meet the wavefront processing scale,speed,and control bandwidth requirements of the thousand-element adaptive optics system of the 4-m-level ground-based large-aperture optical tele⁃scope,a GPU-based high-speed wavefront processor for the adaptive optics system is examined.The wavefront processing method of the adaptive optics system is introduced,and the realization and optimiza⁃tion methods of the GPU-based wavefront processing architecture are discussed.A testbed simulation ex⁃periment is performed using a turbulence simulator,in order to analyze the dynamic performance of the 961-unit adaptive optics system.The experimental results show that when the sampling frequency of the 961-unit adaptive optics system is 1500 Hz,the 0 dB residual error rejection bandwidth of the system can reach 100 Hz.This rejection bandwidth value meets the application requirements of the 4-m optical tele⁃scope adaptive optics system.