中国空间科学技术

中国空间科学技术 ›› 2022, Vol. 42 ›› Issue (3): 58-66.doi: 10.16708/j.cnki.1000-758X.2022.0036

• 论文 • 上一篇    下一篇

深空合作目标高概率捕获复合扫描策略研究

扈航，刘磊，李聪，曹桂兴   

  1. 1西北工业大学 航天学院，西安710072
    2陕西省空天飞行器设计重点实验室，西安710072
    3中国空间技术研究院 通信与导航卫星总体部，北京100094
  • 出版日期:2022-06-25 发布日期:2022-06-22

Research on composite scanning strategy for high-probability acquisition of deep space cooperative targets

HU Hang，LIU Lei，LI Cong，CAO Gui Xing   

  1. 1School of Astronautics，Northwestern Polytechnical University，Xi′an 710072，China
    2Shaanxi Aerospace Flight Vehicle Design Key Laboratory，Xi′an 710072，China
    3Institute of Telecommunication and Navigation Satellites，China Academy of Space Technology，Beijing 100094，China
  • Published:2022-06-25 Online:2022-06-22

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摘要： 针对深空目标长距离星间激光通信时间滞后大、光轴抖动明显、不确定区域大的问题，设计了一种基于两级执行机构的抗抖动高概率捕获复合扫描策略。将目标位置不确定区域划分为等大正方形子区域，在子区域内采用光栅扫描，通过快摆镜实现；在子区域间按照光栅螺旋扫描顺序覆盖，通过伺服转台实现子区域间的跳转。然后在考虑光轴抖动的情况下基于遗传算法对子区域大小、扫描光斑重叠大小进行了优化，得到了参数优化后的扫描方案，并通过仿真进行了验证。1000次蒙特卡洛打靶结果表明，在目标位置不确定区域3.6mrad、激光束散角0.1mrad、光轴抖动标准差5μrad的情况下，优化后的扫描方案对目标的捕获概率为99.2%，对不确定区域的扫描时间为41.34s，扫描到目标的平均扫描时间为9.62s。

关键词: 深空探测, 激光通信, 光轴抖动, 复合扫描, 高概率捕获, 遗传算法

Abstract:

Aiming at the problems of large time delay, significant jitter of optical axis and large uncertain field of target position in long-distance inter-satellite laser communication link building with deep space cooperative target, an anti-jitter and high-probability acquisition composite scanning strategy based on two-stage actuator was proposed. The uncertain field of target position was divided into equalsized square subfields. Raster scanning was adopted in subfields, which was realized by the fast steering mirror. The subfields were covered in raster spiral scanning sequence, the transition between which was realized by the servo turntable. Considering the jitter of optical axis, the size of subfields as well as the overlapped parts of scanning spots was optimized through genetic algorithm. The scanning scheme with optimized parameters was obtained and validated by simulation. The simulation results of 1000 times Monte Carlo shooting show that under the consideration of a 3.6mrad uncertain field with the laser beam divergence of 0.1mrad and the standard deviation of optical axis jitter of 5μrad, the acquisition probability is 99.2%, the scanning time of uncertain field is 41.34s, and the average scanning time of the target is 9.62s,based on the optimized scanning scheme.

Key words: deep space exploration, laser communication, optical axis jitter, composite scanning, highprobability acquisition, genetic algorithm