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首页> 外文会议>Advances in Adaptive Optics II pt.3 >Comparison of Tip-Tilt Controllers using the STRAP Wavefront Sensor in the W.M. Keck Observatory Laser Guide Star Adaptive Optics System
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Comparison of Tip-Tilt Controllers using the STRAP Wavefront Sensor in the W.M. Keck Observatory Laser Guide Star Adaptive Optics System

机译：W.M.中使用STRAP波前传感器的倾斜控制器的比较凯克天文台激光制导星自适应光学系统

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摘要

The W. M. Keck Observatory adaptive optics (AO) system uses the STRAP wavefront sensor to sense tip-tilt using a natural guidestar. The higher-order wavefront sensing can be done using light from either a laser guidestar (LGS) or a natural guidestar (NGS). The tip-tilt guidestar can be as bright as 10th or as faint as 19th magnitude. In both cases, as high a control bandwidth as possible is desired. Thus, it is of interest to determine the potential of various control algorithms over a wide range of signal-to-noise ratios (SNRs). This paper compares two control algorithms using a set of tip-tilt data taken with the STRAP wavefront sensor (a set of four avalanche diodes arranged as a quad cell). The two algorithms are the standard integral control and a minimum variance (LQG) control designed using the power spectral density (PSD) of the data. The bandwidths of the integral control and the minimum variance control are adjusted to produce the least RMS residual wavefront error. The controllers are compared for SNRs representative of the expected range of guidestars.
机译：W. M. Keck天文台自适应光学（AO）系统使用STRAP波前传感器通过自然的引导星来感应倾斜。可以使用来自激光制导星（LGS）或自然制导星（NGS）的光来完成高阶波前感测。倾角引导星的亮度可高达10级或19级。在两种情况下，都需要尽可能高的控制带宽。因此，感兴趣的是在各种信噪比（SNR）范围内确定各种控制算法的潜力。本文使用STRAP波前传感器（一组四个以四单元排列的雪崩二极管组成）采集的倾斜角数据来比较两种控制算法。这两种算法是标准积分控制和使用数据的功率谱密度（PSD）设计的最小方差（LQG）控制。调整积分控制和最小方差控制的带宽，以产生最小的RMS残留波前误差。比较控制器的SNR，以表示指导星的预期范围。

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