The Precision Orbit Determination of Asteroid Based on Optical and Radar Data
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摘要: 本文基于Python语言研发了可处理多源实测数据的小行星定轨软件,通过使用小行星Toutatis实测数据(1976年—2022年期间观测的光学数据与雷达数据)对其进行精密轨道确定研究,并将定轨结果与Toutatis星历作对比,验证了该软件的可靠性。定轨结果表明:联合使用光学与雷达数据进行计算得到的小行星精密轨道在3σ意义下的位置误差为1.9 km,仅使用光学数据计算得到的轨道位置误差为8.818 km,表明雷达数据的引入可以有效降低小行星的轨道确定误差。最终定轨结果达到了千米级的精度,且该精度与小行星星历一致,表明了自主研制的可处理多源实测数据的小行星定轨软件的正确性。
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关键词:
- 小行星Toutatis(4179) /
- 光学数据 /
- 雷达数据 /
- 精密定轨
Abstract: Objectives: In order to serve the implementation of China's deep space exploration programs, we develop software for asteroid orbit determination that can handle multiple sources of measured data. Methods: The precision orbit of the asteroid Toutatis is investigated by using its measured data (optical and radar data observed during the period 1976-2022), and the orbit determination results were compared with the Toutatis ephemeris, which verified the reliability of the software. Results: The orbit determination results show that the position uncertainty of the precision orbit of the asteroid calculated by combining optical and radar data is 1.9 km in the sense of 3, and the orbital position uncertainty calculated by optical data alone is 8.818 km, indicating that the introduction of radar data can effectively reduce the orbital determination error of asteroids. Conclusions: The final orbit determination result reached the engineering level, and the accuracy of the asteroid ephemeris was consistent, which showed the correctness of the self-developed asteroid orbit determination software that can process multi-source measured data.-
Keywords:
- Asteroid Toutatis(4179) /
- Optical data /
- Radar data /
- Precise orbit determination
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