利用CODE新光压模型的精密定轨研究

采用新光压模型ECOMC和ECOM-9，分别使用5种IGU精密超快速星历进行精密定轨，以最终IGS精密星历作为真值，比较GPS卫星的定轨精度。结果表明，相较于ECOM-9光压模型，ECOMC光压模型能够提升卫星径向、切向和法向的轨道精度，其中径向提升较为明显；对比5种IGU超快速精密星历的定轨结果，ECOMC光压模型定轨精度分别能达到5 cm、3.5 cm、2.5 cm、1.5 cm和1.5 cm，优于ECOM-9。

Precise Orbit Determination Using CODE New Solar Radiation Pressure Model

We use the new solar radiation pressure model ECOMC,combined with the ECOM-9 model,to apply five IGU precision ultrarapid ephemeris for precise orbit determination.We take the final IGS precise ephemeris as the true value,and compare the accuracy of GPS satellite orbit determination.The research results show that:compared with the ECOM-9 model,the use of the ECOMC solar radiation pressure model can improve the orbit accuracy of the satellite in the radial,tangential,and cross directions,with more obvious increase in the radial direction.The orbit determination results of fast and precise ephemeris can achieve the orbit determination accuracy of 5 cm,3.5 cm,2.5 cm,1.5 cm and 1.5 cm respectively using the ECOMC new solar radiation pressure model,which is better than the orbit accuracy of ECOM-9.