1.2m量子通信望远镜的空间目标激光测距研究
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1.中国科学院上海天文台;2.中国科学院紫金山天文台;3.河北工业大学

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国家自然科学基金项目(面上项目,重点项目,重大项目)


1.2 Experimental study on laser ranging of space target for m quantum communication telescope
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1.Shanghai Astronomical Observatory, Chinese Academy of Sciences;2.Purple Mountain Observatory, Chinese Academy of Science;3.Hebei University of Technology;4.Shanghai Astronomical Observatory, Chinese Academy of Science

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    摘要:

    高精度的空间碎片测量,可以提供更精确的碎片目标实时信息,增强卫星对空间碎片的规避预警实效性。通过对青海德令哈口径1.2 m量子通信望远镜(海拔3200 m)进行改造,采用单脉冲能量1.2 mJ、重复频率1 kHz皮秒激光开展了卫星激光测距(SLR)与空间碎片激光测距(DLR)试验合作卫星测量距离从500公里到36000公里,测距精度优于2 cm。空间碎片目标测量最远距离1620.5 km,雷达散射截面积(RCS)为2.41 m2,测距精度达到10.64 cm,实现了单套激光器系统即可开展合作目标厘米级精度测距,又可实现空间碎片观测。这是目前为止国际首次采用高重频低功率激光测距系统实现对空间碎片目标的高精度测量,体现了皮秒激光及高海拔大口径望远镜测量优势,供我国西部开展空间目标的激光测距提供参考,为空间碎片激光测距系统选址与空间碎片监视能力的提升提供了有效途径。

    Abstract:

    High-precision space debris measurement can provide more accurate real-time information of debris targets and enhance the effectiveness of satellite avoidance and early warning of space debris. The satellite laser ranging (SLR) and space debris laser ranging (DLR) experiments were carried out by using picosecond laser with pulse energy of 1.2 mJ and repetition frequency of 1 kHz. The atmospheric propagation characteristics of picosecond laser were studied and analyzed. The cooperative satellites measured distances from 500 km to 36000 km with ranging accuracy better than 2 cm. The maximum distance of space debris target measurement is 1620.5 km, the radar cross section (RCS) is 2.41 m2, and the ranging accuracy reaches 10.64 cm. It is realized that a single laser system can carry out centimeter-level precision ranging of cooperative targets and space debris observation. This is the first time in the world to use high repetition frequency and low power laser ranging system to achieve high precision measurement of space debris targets, reflecting the advantages of picosecond laser and high altitude large aperture telescope measurement, providing an effective way for space debris laser ranging system site selection and space debris monitoring capability enhancement.

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  • 收稿日期:2023-11-16
  • 最后修改日期:2024-01-07
  • 录用日期:2024-01-09
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