GRACE卫星太阳光照与地球反照辐射压力模型的效果分析
Analysis of Solar and Earth Albedo Radiation Pressure Models for GRACE on Their Performance
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摘要: 应用GRACE产品说明书中的宏模参数,将模型计算结果与加速度计在径向与法向的非保守力实测值进行比较,结果显示两者之间具有较好的吻合性。通过改变卫星侧面的镜面反射以及漫反射系数,观察模型计算结果与实测数据之间的吻合度变化情况,发现宏模给出的反射系数可能较真实情况偏大。直接使用宏模参数并将其应用于动力学定轨试验,结果表明,本文采用的光照辐射压力模型满足动力学定轨的精度需要,且较传统Knocke地球反照辐射模型在效果上有了较大的改进。Abstract: Accurate model of radiation pressure is essential in determining the variations of the thermospheric density and the winds from accelerometer aboard the GRACE.In order to analyse the radiation model we employed in the paper,modeled radiation acceleration is compared with observed value from accelerometer in radial and cross-track components,which shows that they coincide with each other well.By changing the specular and diffusive reflectivity coefficients in Starboard panel,we observe the change in agreement between modeled acceleration and actual measurement,finding that the reflectivity coefficients in macro-model may be overestimated.By implementing the radiation pressure model inorbit determination with raw macro-model coefficients,the result indicates that the model meets the precision requirement of dynamical orbit determination,making considerable improvement in performance when compared with traditional Knocke model.
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