Wang Lianqi, Ellerbroek Brent, Veran Jean Pierre
TMT Observatory Corporation, 2632 East Washington Boulevard, Pasadena, California 91107, USA.
Appl Opt. 2009 Sep 20;48(27):5076-87. doi: 10.1364/AO.48.005076.
We describe a high fidelity simulation method for estimating the sky coverage of multiconjugate adaptive optics systems; this method is based upon the split tomography control architecture, and employs an AO simulation postprocessing technique to evaluate system performance with hundreds of randomly generated natural guide star (NGS) asterisms. A novel technique to model the impact of quadratic wavefront aberrations upon the NGS point spread functions is described; this is used to model the variations in system performance with different asterisms, and is crucial for obtaining accurate results with the postprocessing technique. Several design and algorithm improvements help to reduce the residual wavefront error in the tip/tilt and plate scale modes that are controlled using the NGS asterism. These improvements include choosing the right wavefront sensor (WFS) pixel size, optimal pixel weights, and type II control of the plate scale modes.
我们描述了一种用于估计多共轭自适应光学系统天空覆盖率的高保真模拟方法；该方法基于分裂层析成像控制架构，并采用自适应光学模拟后处理技术，通过数百个随机生成的自然导星（NGS）星群来评估系统性能。文中描述了一种模拟二次波前像差对NGS点扩散函数影响的新技术；该技术用于模拟不同星群下系统性能的变化，对于后处理技术获得准确结果至关重要。一些设计和算法改进有助于减少使用NGS星群控制的倾斜和板比例模式中的残余波前误差。这些改进包括选择合适的波前传感器（WFS）像素尺寸、最佳像素权重以及板比例模式的II型控制。
