Two kinds of interpolation algorithms are analyzed and concluded that the centroiding algorithm is better for star spot position estimation . the noise effects on the centroding are analyzed by numeric simulation , educes the noise rms model 利用误差统计理论，采用数值模拟的方法，分析了各种噪声对矩心法质心计算精度的影响，推导整理了噪声误差模型。
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For the hyper accuracy interpolation technique , which resolves the accuracy limitation of pixel physical size , derives out the star spot interpolation accuracy limitation based on the star spot mathematical model and photoelectric statistics 针对克服像元尺寸对测量精度限制的超精度内插细分技术，在建立了星点光斑数学模型的基础上，利用光电统计理论，推导了星点光斑内插细分精度的极限公式。
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