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Noise estimation plays significant role in payload assessment,image processing and data application.In this paper,considering characteristics of Beijing-1 small satellite,the image-based noise estimation methods with their applicability are ap-praised and compared through experiments.The parameters and model optimization are also discussed for better assessment of noise.With comprehensive analysis of noise estimation results from different land cover types,the Beijing-1 small satellite noise is evaluated with its standard deviation.Comparison of the noise estimation from images acquired in 2008 and the in-orbit test right after launch in 2005 shows that noise level of the Beijing-1 small satellite does not change,the satellite has well-kept per-formance even after 3 years of operation.
Noise estimation plays significant role in payload assessment, image processing and data application. This paper, considering characteristics of Beijing-1 small satellite, the image-based noise estimation methods with their applicability are ap-praised and compared through experiments. Parameters and model optimization are also discussed for better assessment of noise. With comprehensive analysis of noise estimation results from different land cover types, the Beijing-1 small satellite noise is evaluated as its standard deviation. Comparison of the noise estimation from images acquired in 2008 and the in-orbit test right after launch in 2005 shows that noise level of the Beijing-1 small satellite does not change, the satellite has well-kept per-formance even after 3 years of operation.