光电工程, 2012, 39 (6): 34, 网络出版: 2012-06-25
基于 FPGA和 DSP的自适应光学系统 在线性能评估的嵌入式处理平台设计
The Embedded Processing Platform Design Based on FPGA and DSP of an Adaptive Optics System On-line Performance Evaluation
在线性能评估 点扩散函数 斯特列尔比 半高全宽 调制传递函数 自适应光学系统 on-line performance evaluation point spread function Strehl ratio full width half maximum modulation transfer function adaptive optics system
摘要
为了实现自适应光学系统性能的在线实时评估,提出并设计了一种基于 FPGA和 DSP的嵌入式处理平台。该嵌入式处理平台以 FPGA作为协处理器,实现前端的高速数据缓存,以 DSP作为主处理器,实现后端复杂的信号处理;根据哈特曼波前传感器探测的残余斜率,在线实时计算自适应光学系统的点扩散函数、斯特列尔比、半高全宽和调制传递函数。结果表明,系统点扩散函数计算误差为 10-11量级,斯特列尔比的计算误差为 10-3量级,半高全宽的计算误差为 10-4倍衍射极限,调制传递函数计算误差为 10-4量级。该嵌入式处理平台具有运算精度高,结构简单,便于系统集成,通用性强等优点。
Abstract
For on-line real time performance evaluation of an adaptive optics system, an embedded processing platform based on FPGA and DSP is proposed and designed, in which the FPGA is a co-processor for the high-speed data buffer, and the DSP is a main processor for the later complex signal processing. According to the closed-loop data of residual slope detected by Hartmann wavefront sensor, the on-line evaluation of performance parameters of an adaptive optics system is realized on this proposed platform, including point spread function, Strehl ratio, full width half maximum and modulation transfer function. The results indicate that the error levels of point spread function, Strehl ratio, full width half maximum are 10-11, 10-3, 10-4 times as diffraction limit and 10-4, respectively. As well as highly operational precision, this embedded processing platform has a simple structure, which is good for integration, and strong commonality.
母杰, 饶长辉, 李梅, 郑文佳. 基于 FPGA和 DSP的自适应光学系统 在线性能评估的嵌入式处理平台设计[J]. 光电工程, 2012, 39(6): 34. MU Jie, RAO Chang-hui, LI Mei, ZHENG Wen-jia. The Embedded Processing Platform Design Based on FPGA and DSP of an Adaptive Optics System On-line Performance Evaluation[J]. Opto-Electronic Engineering, 2012, 39(6): 34.