基于FPGA的自适应光学波前处理算法

针对自适应光学系统对波前处理计算量和实时性要求的提高,提出了一种基于现场可编程门阵列(FPGA)的自适应光学系统波前处理算法。该算法利用核心处理模块重复利用的方式完成波前斜率计算,利用矩阵与向量相乘的可分解性完成波前复原计算。在像素时钟的同步下,完成整个波前处理,给出促动器所需的促动量。以一片Virtex-4LX80FPGA作为主核心处理芯片进行了实验验证,结果表明:该算法可降低50%的硬件资源,提高了系统波前处理能力;另外,算法可实现在当前帧结束前完成整个波前处理运算,提高了系统的波前处理速度和整个自适应光学系统的控制带宽。在室内的Shack-Hartmann波前传感器的的自适应光学系统上进行了激光光源的校正实验,结果显示光源能力集中度有了明显的提高。

Adaptive optical wave-f ront processing algorithm based on FPGA

A wave-front processing algorithm was proposed based on Field Programming Gate Array (FPGA ) for improving computational complexity and real-time ability of adaptive optical systems . The reuse of core processing module was used to calculate a wave-front slope ,and the decomposition of matrix and vector was used to calculate the wave-front restoration .Under the synchronization of pixel clock ,the whole wave front was processed and the momentum required by an actuator was giv-en .A piece of Virtex-4 LX80 FPGA was taken as a main chip to perform experimental verification , and the experiment results show that the algorithm reduces the hardware resources by 50％ ,and im-proves wave-front processing ability of the system .Furthermore ,all of the wave-front processing op-erations can be implemented in the current frame before the processing end ,w hich improves process-ing speeds and control bandwidths of the adaptive optic system .The new algorithm has carried on the correction experiment of the laser light source for a Shack-Hartmann in the room ,and it shows a high-er concentration ratio of light source .