arXiv:2504.17029astro-ph.IMcs.AI2025-04被引 1

用单张波前传感器图像实时估算大气湍流强度,提升望远镜成像质量。

Fried Parameter Estimation from Single Wavefront Sensor Image with Artificial Neural Networks

  • 基于计算机视觉的神经网络,从单张波前图直接估计弗里德参数
  • 在多种观测条件下误差小于几毫米,闭合/开环均适用
  • 推理仅需0.83毫秒,适合实际望远镜实时控制系统

地面望远镜受大气湍流影响,成像模糊失真。自适应光学(AO)系统通过波前传感器测量大气扰动,并实时校正光波前。弗里德参数(r0)是表征大气湍流强度的关键参数,对优化AO系统性能及自由空间光通信信道探测至关重要。本文提出一种新型数据驱动方法,利用计算机视觉中的机器学习技术,从单张夏克-哈特曼或金字塔波前传感器图像中估算r0。通过开源COMPASS AO仿真工具,在不同导星亮度、真实噪声、大气与仪器条件下进行详细评估。结果表明,该方法可构建统一神经网络模型,在开环和闭环AO配置下均实现高精度估计,直接从AO遥测数据中获得毫米级精度的r0值。算法可在消费级NVIDIA RTX 3090 GPU上实现0.83毫秒的推断速度,具备显著经济性,适用于实时仪器控制。

原文摘要 · Abstract (English)

Atmospheric turbulence degrades the quality of astronomical observations in ground-based telescopes, leading to distorted and blurry images. Adaptive Optics (AO) systems are designed to counteract these effects, using atmospheric measurements captured by a wavefront sensor to make real-time corrections to the incoming wavefront. The Fried parameter, r0, characterises the strength of atmospheric turbulence and is an essential control parameter for optimising the performance of AO systems and more recently sky profiling for Free Space Optical (FSO) communication channels. In this paper, we develop a novel data-driven approach, adapting machine learning methods from computer vision for Fried parameter estimation from a single Shack-Hartmann or pyramid wavefront sensor image. Using these data-driven methods, we present a detailed simulation-based evaluation of our approach using the open-source COMPASS AO simulation tool to evaluate both the Shack-Hartmann and pyramid wavefront sensors. Our evaluation is over a range of guide star magnitudes, and realistic noise, atmospheric and instrument conditions. Remarkably, we are able to develop a single network-based estimator that is accurate in both open and closed-loop AO configurations. Our method accurately estimates the Fried parameter from a single WFS image directly from AO telemetry to a few millimetres. Our approach is suitable for real time control, exhibiting 0.83ms r0 inference times on retail NVIDIA RTX 3090 GPU hardware, and thereby demonstrating a compelling economic solution for use in real-time instrument control.

自适应光学弗里德参数神经网络实时估计

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