Abstract:

Based on the satellite celestial navigation, this paper studies the mechanism of the starlight transmission in atmospheric turbulence in the stratosphere, reveals the attenuation law of the starlight during transmission, and provides the theoretical basis for establishing the navigation star database and the compensation algorithm of a charge coupled device (CCD) star map. Segments with a certain thickness is proposed by intercepting the sections at the boundary of which the density and density fluctuation of the turbulent field has changed seriously. At the mean time the deflection and average intensity of the starlight after transferring through each section is calculated respectively according to the geometrical optic method and the statistical optic theory, and then the energy attenuation curve of the starlight during transmission through the whole stratosphere is derived either. The k-ε turbulence model is adopted to simulate the density and density fluctuation field of the atmospheric turbulence in different extreme natural cases. The results of the simulation show that the starlight will be deflected obviously and the starlight intensity will decay after traveling through the stratosphere with turbulence, where its deflection and attenuation are related to the density and the density fluctuation of the turbulence, respectively.

Key words: Satellite celestial navigation, Atmospheric turbulence, Atmospheric optical effects, Magnitude