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Shack-Hartmann wavefront sensing with elongated sodium laser beacons: centroiding versus matched filtering

机译：带有细长钠激光信标的Shack-Hartmann波前传感：质心与匹配滤波

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摘要

We describe modeling and simulation results for the Thirty Meter Telescope on the degradation of sodium laser guide star Shack-Hartmann wavefront sensor measurement accuracy that will occur due to the spatial structure and temporal variations of the mesospheric sodium layer. By using a contiguous set of lidar measurements of the sodium profile, the performance of a standard centroid and of a more refined noise-optimal matched filter spot position estimation algorithm is analyzed and compared for a nominal mean signal level equal to 1000 photodetected electrons per subaperture per integration time, as a function of subaperture to laser launch telescope distance and CCD pixel readout noise. Both algorithms are compared in terms of their rms spot position estimation error due to noise, their associated wavefront error when implemented on the Thirty Meter Telescope facility adaptive optics system, their linear dynamic range, and their bias when detuned from the current sodium profile.
机译：我们描述了三十米望远镜对钠激光制导星Shack-Hartmann波前传感器测量精度的下降的建模和模拟结果，这将由于中层钠层的空间结构和时间变化而发生。通过使用一组连续的钠剖面激光雷达测量，分析并比较了标准质心和更优化的噪声-最佳匹配滤波器点位置估计算法的性能，并比较了每个子孔径等于1000个光检测电子的名义平均信号电平每个积分时间，取决于子孔径对激光发射望远镜距离和CCD像素读出噪声的影响。比较了两种算法的均方根值（由于噪声引起的均方根位置估计误差），在三十米望远镜设施自适应光学系统上实现时的相关波前误差，线性动态范围以及从当前钠曲线失谐时的偏置。

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