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一、序 言 将研究当具有数个测量点的数据时,飞行器再入大气层的轨道估计问题。与飞行条件,测量设备的种类和计算轨道所要求的精度相关,此问题很复杂。 在某些情况下,当不要求很高的精度时,可以根据一个测量点的信息加工来计算再人轨道。当应用雷达站时,此信息包括时间,距离,方位角和高低角,开始经过平滑,（为了去掉高频测量随机噪声）然后,根据被平滑的数据迭代地解算运动的弹道方程。 但是当确定轨道精度的要求是首要的时,则一个测量点的信息就显得不够。就出现了运用数个测量点的信息来获得轨道最优估算的问题。
I. Introduction The preamble will study the problem of orbital estimation of an aircraft reentry atmosphere when data with several measurement points are available. This issue is complicated by the fact that it relates to the conditions of flight, the type of measuring equipment and the required accuracy of the calculated orbit. In some cases, when no high accuracy is required, re-orbit can be calculated from information processing at one measurement point. When using a radar station, this information includes time, distance, azimuth, elevation and elevation, and begins to be smoothed (to remove high-frequency measurements of random noise). Then, the trajectory equation of motion is iteratively solved based on the smoothed data. However, when the requirement for determining the orbital accuracy is of primary importance, the information of one measurement point does not appear to be sufficient. There has been the problem of using the information of several measurement points to obtain the optimal orbit estimation.