| 基于改进人工势函数的航天器近距离安全控制方法1) | 
| 许丹丹, 张进 | 
| A COLLISION-AVOIDANCE CONTROL ALGORITHM FOR SPACECRAFT PROXIMITY OPERATIONS BASED ON IMPROVED ARTIFICIAL POTENTIAL FUNCTION 1) | 
| Xu Dandan, Zhang Jin | 
| 图2 两种碰撞预警门限的航天器轨迹对比 | 
| Fig. 2 Comparison of spacecraft trajectory between two collision warning thresholds | 
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