通用自适应光学波前实时处理机的设计

发布时间：2018-01-05 14:19

本文关键词：通用自适应光学波前实时处理机的设计　出处：《中国激光》2015年12期 　论文类型：期刊论文

【摘要】：为满足天文观测及激光通信等领域的1000单元级以下的自适应光学(AO)系统的高速实时处理的要求,提出一种单板上实现高速实时计算的通用化技术方案。采用多核CPU实时计算波前,结合高速图像采集卡,以满足系统高帧频的需求;计算机系统采用Xenomai实时操作系统及Linux操作系统,以满足AO系统低延迟的需求;实现了在单台计算机上集成实时处理与监控的紧凑型处理系统。采用向量指令优化及多核并行运算,在6核的计算平台上获取了峰值每秒510亿次浮点运算的计算能力,102 GB/s的通信带宽。仿真结果表明可以对1145个驱动器,949个子孔径的系统进行2000 Hz的处理,处理延迟低于240μs;通过修改参数后,应用于光通信的137单元AO系统中,校正后斯特列尔比为0.61。结果表明该处理方案能满足1145单元以下AO系统2000 Hz实时处理的需要,并具有通用性。
[Abstract]:In order to meet the needs of adaptive optical astronomical observation and laser communications unit 1000 level (AO) system of high-speed real-time processing requirements, this paper proposes a single board to achieve the general technical scheme for high speed real-time computing. Using multi-core CPU real-time calculation of wavefront, combined with high speed image acquisition card, in order to meet the requirement of the system is high frame rate; computer system using Xenomai real-time operating system and Linux operating system, AO system to meet the demands for low latency; realize compact integrated monitoring and real-time processing on a single computer system. Using vector instructions and multi-core parallel computing optimization, the computing platform 6 core access to computing power the peak of 51 billion times per second floating-point operations, the communication bandwidth of 102 GB/s. The simulation results show that the 1145 drive, 949 sub aperture processing system for 2000 Hz, the processing delay of less than 240 s;. Through modifying the parameters, applied to the 137 unit of AO system of optical communication, the corrected Strehl ratio is 0.61. results show that the scheme can meet the needs of AO system of 1145 unit 2000 Hz under real-time processing, and versatility.

【作者单位】：中国科学院光电技术研究所;电子科技大学光电信息学院;中国科学院大学;
【基金】：国家自然科学基金(61308082)
【分类号】：O439;TP332
【正文快照】： 1引言观测暗弱的天文目标或激光进行大气传输时,由于受大气湍流的影响,造成接收的光斑弥散[1-4]。为了克服大气湍流的影响,需要配备自适应光学(AO)系统对大气湍流引入的光学畸变进行实时校正[1-4]。为实现对大气湍流造成的时域中低频动态像差的有效校正,通常要求系统工作在200

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