基于PCl-Express高速图像采集卡对扩展源大气倾斜量的实时补偿  

The Real-Time Compensation of Wavefront Tilt for Extended Source Objects Based on a High-Speed PCI-Express Image Acquisition System

作　　者：杨靖文[1,2,3] 陈善球[2,4] 熊耀恒[1] 饶长辉[2,4] 

机构地区：[1]中国科学院国家天文台云南天文台,云南昆明650011 [2]中国科学院光电技术研究所自适应光学研究室,四川成都610209 [3]中国科学院研究生院,北京100049 [4]中国科学院自适应光学重点实验室,四川成都610209

出　　处：《天文研究与技术》2011年第2期185-191,共7页Astronomical Research & Technology

基　　金：国家自然科学基金(10803019)资助

摘　　要：为能够实时补偿大气湍流对月球激光测距带来的波前倾斜量误差,采用相关跟踪自适应光学系统,并根据其大计算量、高实时性的要求,创新地设计了基于PCI-Express高速图像采集卡及其硬实时操作系统驱动程序,完成对扩展源目标大气倾斜量的实时补偿。详细介绍了整体系统的软硬件设计,给出了一种PCI-Express高速图像采集卡设计结果及其RTAI实时驱动程序的软件设计结果,完成了进一步提高图像传输速度,减小相关跟踪系统系统延迟,提高系统响应带宽的目标,最终实现了图像数据的实时传输(≤28μs)及波前倾斜量的实时补偿(≤348μs)。We use a correlation tracking adaptive optics system to compensate the wavefront tilt in lunar laser ranging caused by atmospheric turbulence in real time. To handle large computational amounts and meet high real-time requirements, we innovatively design a high-speed image acquisition card based on PCI- Express and a hardware RTAI real-time operating system driver so as to compensate atmospheric tilt for extended source objects in real time. After analyzing the hardware and software designs of the entire system, we present the design of the high-speed image acquisition system. It further enhances the image transmission speed, reduces the latency of the correlation tracking system, and improves system response bandwidth. The system achieves real-time data transmission （≤28us） and real-time compensation of wavefront tilt（≤348us）.

关 键 词：月球激光测距 PCI—Express FPGA RTA Linux 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置]