风云四号卫星双程测距系统精密轨道确定

针对我国新一代静止轨道卫星风云四号高精度轨道计算需求，地面跟踪系统设计了多台站双频双程测距模式。详细给出了信号传播介质改正中的电离层与对流层处理方法，并给出了风云四号卫星动力学轨道确定策略。在非变轨期间，采用动力学定轨方法。轨道确定残差分析，测量噪声均方根优于0.5 m。通过轨道重叠分析，非变轨期间精度优于20 m。动量轮卸载期间，采用估计经验力的方法，其定轨残差优于1 m。对多弧段数据处理表明文中方法满足同步卫星双程测距模式下的高精度轨道跟踪问题。

Orbit Determination for FY-4 Satellite Using Two Way Ranging System

In order to meet the high-precision orbit calculation requirements of China’s new-generation geostationary orbit satellite, FY-4, the ground tracking system has been designed with a multi-station dual-frequency two-way ranging mode. The ionospheric and tropospheric processing methods in signal propagation medium correction are presented in detail, and the dynamic orbit determination strategy of the FY-4 satellite is given. During the normal period without orbital maneuver, the dynamic orbit determination method is adopted. The RMS of the measurement noise is better than 0.5 m. Through the analysis of track overlap, the accuracy of the normal period is better than 20 m. During the unloading period of the momentum wheel, the method of estimating the empirical force is adopted, and its orbit determination residual is better than 1 m. The multi-arc data processing shows that the proposed method satisfies the high-precision orbit tracking in the two-way ranging mode of geosynchronous satellites.