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为了更好地评价与研究受视宁影响的观测系统,引入了基于功率谱的分析方法.使用不同截止频率以及衰减系数的卡曼谱来反演系统的中高频误差,同时使用Zernike多项式来表征系统低阶起伏,结合这两种误差,得到了系统误差的数值模型.最后,通过分析实际波前叠加数值模拟大气扰动前后的功率谱,验证了本方法评价受视宁影响的大口径系统的可行性.
In order to evaluate and study the observation system influenced by Tingning better, a power spectrum based analysis method is introduced, and the medium and high frequency errors of the system are inverted by using different cutoff frequency and attenuation coefficient of Kaman spectra, and the Zernike polynomials are used to characterize The systematic low-order undulation is combined with these two kinds of errors to get the numerical model of system error.Finally, by analyzing the actual wavefront superimposed numerical simulation of the power spectrum before and after atmospheric disturbance, we verify that this method evaluates the large- feasibility.