卫星高精度自主定轨中大气密度模型

Atmospheric Density Model in the High-precision Autonomous Orbit Determination of Satellites

在卫星高精度自主定轨中,由于需要考虑大气阻力对轨道的影响,以及卫星敏感器观测穿过大气层的星光时,都需要知道大气密度。大气密度的变化规律非常复杂,影响密度变化的几个主要因素是:高度、地球形状、昼夜和季节,根据以往的卫星观测资料所得到的大气密度变化规律和前人的工作,给出大气密度的数学模型和综合因素分析,以在卫星自主定轨中可以利用。

Considering the influence of atmospheric resistance on orbit, and the influence of starlight on the observation with star sensor, atmospheric density has to be taken into consideration in high -precision autonomous orbit determination of satellites. The mechanism of change of atmospheric density is very complicated. It is influenced by several factors, including altitude, shape of earth, day and night, and seasons. Based on the data obtained from satellite observation and previous findings, this article provides the mathematical model of atmospheric density so that it can used in autonomous orbit determination of satellites.