基于脉动阵列的自适应光学实时波前处理机设计  

Design and Analysis of Real-time Adaptive Optics Wavefront Processor Based on Systolic Array

作　　者：郑文佳[1] 王春鸿[1] 姜文汉[1] 李梅[1] 唐端午[1] 

机构地区：[1]中国科学院光电技术研究所

出　　处：《光电工程》2008年第5期44-49,共6页Opto-Electronic Engineering

基　　金：国家863高技术项目资助(2006AA802206)

摘　　要：针对自适应光学系统对波前处理机高计算量、高实时性的要求,本文提出了一种基于脉动阵列的自适应光学实时波前处理方法。该方法将脉动阵列的概念引入波前处理机设计,完成了波前斜率计算、复原运算和控制运算向脉动阵列的映射,合理地建立了数据的深度流水线,同时分析了以FPGA技术实现时系统的计算延时。对于48个子孔径、61单元的自适应光学系统,以一片Xilinx Virtex-ⅡXC2V3000芯片实现了基于脉动阵列的实时波前处理机,实验测得计算延时仅8.6μs,结果表明该方法能极大地提高系统的实时性、集成度、通用性和扩展性。Adaptive optics system requires the high calculation capability and high real-time capability of wavefront processor. In view of the requirements, a new method for real-time adaptive optical wavefront processor based on systolic array is proposed. The method maps wavrfront gradient calculation, wavrfront reconstruction and wavefront control calculation to systolic array respectively in order to build the deep pipelines of data reasonably. Meanwhile, the latency of the wavefront processor based on Field Programmable Gate Arrays （FPGA） technology is analyzed. A 61-element 48 sub-aperture adaptive optical system has been implemented using a Xilinx Virtex-Ⅱ XC2V3000 FPGA. Experimental results indicate that the latency is only 8.6μs, As a result, the method can greatly increase the wavefi＇ont processor real-time performance, integration level, expansibility and general-purpose character.

关 键 词：自适应光学 波前处理机 脉动阵列 FPGA 

分 类 号：O493[理学—物理]