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当在轨道运行段发生严重故障时,载人飞船应具备及时应急返回地面的能力。交会对接任务中,载人飞船多次变轨,传统的由地面生成返回控制参数并注入航天器的方法难以适应任务急需,为此提出船上自主计算的自主应急返回设计,以适应交会对接任务的需求。载人飞船接收一段时间的轨道测量信息后,通过简化的平根数算法,进行轨道确定和预报。通过对未来一段时间载人飞船经过落区的情况进行判断,选择可用于应急返回的落区。返回参数和落点经纬度通过经神经网络训练后的计算模块计算得出。
When a serious fault occurs in the orbital section, the manned spacecraft should have the capability of returning to the ground in time and in an emergency. Rendezvous and docking mission, the manned spacecraft orbit several times, the traditional method of generating return control parameters generated by the ground and injected into the spacecraft is difficult to adapt to the urgent task, for which autonomic emergency return design is proposed on board to meet the rendezvous and docking mission demand. After the manned spacecraft receives the orbital measurement information for some time, the orbit determination and forecasting is carried out by the simplified root mean square algorithm. By judging the situation that the manned spacecraft passes the landing zone in a period of time in the future, the landing zone that can be used for emergency return is selected. The return parameters and landing latitude and longitude are calculated by the training module trained by neural network.