Influence of Atmospheric Refraction on Timing Deviation of Time Transfer by Space Laser Link at Double Wavelengths

An atmospheric refractive index estimation method based on multispectral stellar observation data

“…It can be proved that the refractive index of band 1 in layer N-1 atmosphere as shown in Figure 1 According to the literature [7] [10], if the parameters of band 1 and band 2 are known, there is also a certain relationship between their refractive index and in vacuum. This relationship can be used as a constraint at the initial time of recursion to correct the outliers with large errors in the stellar observation data (in fact, the multispectral detection data can be substituted into the recursive process to calculate the incident angle of the stellar ray incident on the top of the atmosphere respectively).…”

“…Atmospheric refraction is an important research branch in the field of remote sensing The atmospheric refractive index will affect remote sensing image positioning, space-based laser communication, star sensitive data processing and other applications [1][2][3][4][5] , so domestic and foreign scholars have also analyzed the factors that affect the atmospheric refractive index [6][7][8][9][10] . In reference [1], the authors studied the estimation of stellar refraction based on single band observations.…”

“…However, after processing the observation data, it is found that the refraction of some stars will change with seasons and weather, possibly due to the influence of different atmospheric components. Reference [7] clearly proposed to use two band data for refractive index correlation processing. Due to no mutual verification of star data in a single spectral segment, Observational data of stars at different times may have different atmospheric refractive indices due to changes in atmospheric composition, the same set of atmospheric refractive index parameters cannot be regressed from star observation data at different times.…”