Post-event high-precision attitude determination method

The invention discloses an after-event high-precision attitude determination method, belongs to the field of spacecraft attitude control, and is suitable for spacecrafts with multi-load after-event high-precision attitude determination requirements. The method comprises the following steps: firstly, respectively mounting at least two very-high-precision star sensors on a plurality of loads; secondly, performing star sensor reference calibration according to star sensor measurement data on each load; and finally, carrying out Kalman filtering correction according to respective star sensor measurement data and gyro measurement data on each load, and post-event high-precision attitude determination of the load being carried out. 一种事后高精度姿态确定方法，属于航天器姿态控制领域，适用于具有多载荷的有事后高精度姿态确定需求的航天器。该方法首先在多个载荷上分别安装至少两台甚高精度星敏感器；其次根据各载荷上的星敏感器测量数据进行星敏基准标定；最后根据各个载荷上各自的星敏感器测量数据和陀螺测量数据进行卡尔曼滤波修正，进行该载荷的事后高精度姿态确定。