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已经发表了许多公式,都能用来部分修正大气折射对激光测距数据的影响。这些公式全都假定大气折射率剖面为球面对称。本文采用球面对称及三维折射率分布的射线描迹法研究了水平折射率梯度的影响。该剖面是根据无线电探空数据构成。结果表明:卫星仰角在10附近时,水平折射率梯度引进均方根误差约为3厘米。而卫星接近天顶时,该误差将减少到几毫米。
Many formulas have been published that can be used to partially correct the effect of atmospheric refraction on laser ranging data. All of these formulas assume that the atmospheric refractive index profile is spherical symmetric. In this paper, the influence of horizontal refractive index gradient is studied by using the ray tracing method of spherical symmetry and three-dimensional refractive index distribution. The profile is based on radiosonde data. The results show that when the satellite elevation angle is around 10, the root mean square error of the horizontal refractive index gradient is about 3 cm. When the satellite approaches Zenith, the error will be reduced to a few millimeters.