针对大型地基高分辨率成像望远镜对自适应光学系统波前处理规模的需求,设计了基于现场可编程门阵列(FPGA)的高速大单元自适应波前处理系统,给出了设计方案,实施过程和测试结果.提出的基于FPGA的自适应光学系统波前处理机,在软件上采用FPGA对整个系统进行数据配置和调控,实现多路D/A数据同时传输和转换.同时,采用FPGA作为波前处理运算中的图像预处理和波前子孔径斜率计算的核心器件,在满足波前处理精度的前提下,缩短了波前处理延时,提高了波前处理能力,波前处理可达2 000 frame/s.在硬件上,采用波前处理主板与可扩展的波前处理子板相结合的形式来提高系统的输出能力.每块波前处理子板的校正量输出为120路,波前处理主板的最大扩展能力为10块,整个系统可实现1 200路校正量的输出.%In accordance with the need of a larer ground-based high resolution imaging telescope for a-daptive optical wave-front processing, an Adaptive Optical (AO) wave-front processing system with larger calculation and thousands of units was designed based on the Field Programming Gate Array (FPGA) and its operation scheme, implement processing and tested results were given. At the software, the FGPA was used to configure and control data and to realize the conversion and transmission of multi-channel D/A data synchronously. Meanwhile,the FPGA was taken as a key element to pre-process the image and calculate the wave-front gradient of a sub-aperture. With satisfied wave-front processing precisions,it shortens wave-front processing delay and improves the ability of wave-front processing. Results demonstrate that the system can achieve the wave-front processing in 2 000 frame/s. At the hardware,this system combined the wave-front processing host board and wave-front processing sub board to improve the output ability of the system. As each wave-front processing sub board can promote the output of 120 road and the maximum expansion capacity of the main board is 10, the system can reach the momentum of the output in 1 200 road.
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