王波, 刘路, 鄢建国, 高梧桐. 小行星光学定轨软件研制和数据处理分析[J]. 武汉大学学报 ( 信息科学版). DOI: 10.13203/j.whugis20200195
引用本文: 王波, 刘路, 鄢建国, 高梧桐. 小行星光学定轨软件研制和数据处理分析[J]. 武汉大学学报 ( 信息科学版). DOI: 10.13203/j.whugis20200195
WANG Bo, LIU Lu, YAN Jianguo, GAO Wutong. Development of Asteroid Optical Determination Software and Data Processing Analysis[J]. Geomatics and Information Science of Wuhan University. DOI: 10.13203/j.whugis20200195
Citation: WANG Bo, LIU Lu, YAN Jianguo, GAO Wutong. Development of Asteroid Optical Determination Software and Data Processing Analysis[J]. Geomatics and Information Science of Wuhan University. DOI: 10.13203/j.whugis20200195

小行星光学定轨软件研制和数据处理分析

Development of Asteroid Optical Determination Software and Data Processing Analysis

  • 摘要: 结合中国航天局2019年4月19日拟定的第一个小行星探测任务规划,本文针对任务目标之一的主带彗星133P/Elst-Pizarro(7968)自主研制了小行星光学定轨软件。使用1979年7月24日至2019年10月28日期间发布的133P/Elst-Pizarro地面光学观测数据进行精密定轨,与国际知名小行星光学定轨软件OrbFit对比分析。对比发现解算结果残差分布一致,两软件生成的残差差值的RMS小于0.01″,定轨的内符合精度相互吻合。这一结果初步表明自主研制的小行星光学定轨程序的可靠性。在此基础上,对133P/Elst-Pizarro开展光学数据仿真定轨分析,研究地面光学数据的定轨精度。结果表明:模拟云南站和智利站每月一次联测,在只考虑观测噪声影响的情况下,添加接近目前实际观测水平的高斯白噪声,使用20年光学观测资料定轨,小行星光学定轨精度在50 km量级。同时验证增加观测数据或降低观测噪声均可有效提高小行星光学定轨精度。

     

    Abstract: Based on the first asteroid exploration plan announced by China Space Administration on April 19, 2019, we develop an optical orbit determination software for the main belt comet 133P/Elst-Pizarro (7968), which is one of the mission targets. The 133P/Elst-Pizarro's ground-based optical observation data from July 24, 1979 to October 28, 2019 are analyzed. Compared with the well-known OrbFit software system, it is found that the residual distribution is consistent, the measurement statistical residual RMS is less than 0.01″, and the internal coincidence accuracy of orbit determination is also consistent with each other. The results suggests the reliability of our software. Furthermore, we carry out a simulation orbit determination analysis aimed at 133P/Elst-Pizarro to discuss the orbit determination accuracy from ground-based optical data. When we use 20-year optical observation data measured once a mouth from Yunnan and Chile station and adding Gaussian white noise which is close to the current actual observation level, the results reflect that the optical orbit determination accuracy of the asteroid is at 50 km level. At the same time, it also shows that the optical orbit determination accuracy of the asteroid can be effectively improved by increasing the observation data or reducing the observation noise.

     

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