中文摘要：

在航天器碰撞预警工作中，为节省计算时间，需要从大量空间目标中筛选出可能的危险目标，计算碰撞概率等参量并进行风险评估．通常采用的筛选方法包括高度筛选、几何筛选和时间筛选三步，不同文献中后两步筛选的算法略有不同，同时各方法均难以实现预报三天的快速碰撞预警．本文通过充分考虑一阶摄动项对目标轨道的影响，改进了时间筛选算法，并在其后增加了距离筛选，将筛除比例从通常的大约99％提高到99．97％，为实现快速碰撞预警工作提供了理论支持．通过对实测数据的计算比较，验证了方法的正确性及高效性．

英文摘要：

In general, there are three prefilters for orbit screening, namely height prefilter, geomet- rical prefilter and time prefilter. The algorithms of the last two prefilters are slightly different in literatures. The Methods offered by references can hardly be competent in fast collision warning for three days. In this paper, a new orbit screening method is introduced, which can highly improve the screening efficiency and hence reduce the computation time for space debris collision predictions. In this method, the time prefilter algorithm is improved by giving more consideration to the first order perturbation of the target orbit. After that, a distance prefilter is added, which screens through the minimum distance between two objects. As a result, the ratio of objects excluded from the candidates can be improved from about 99% to 99.97%. The correctness and high efficiency of this method got verified through the calculation of the measured data. Therefore, this method can be treated as a theoretical basis for three-day fast collision warning.