| 小行星光学定轨软件研制和数据处理分析 |
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| 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),2023,48(2):277-284. |
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| 作者姓名： | 王波 刘路 鄢建国 高梧桐 |
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| 作者单位： | 1.武汉大学测绘遥感信息工程国家重点实验室, 湖北 武汉, 430079 |
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| 基金项目： | 国家自然科学基金U1831132湖北省自然科学基金2018CFA087 |
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| 摘 要： | 结合中国航天局2019-04-19拟定的第1个小行星探测任务规划，针对任务目标之一的主带彗星133P/ElstPizarro(7968)自主研制了小行星光学定轨软件。使用1979-07-24—2019-10-28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进行对比分析。对比发现，解算结果残差分布一致，两软件生成的残差均方根的差值小于0.01″，定轨的内符合精度相互吻合。该结果初步表明，自主研制的小行星光学定轨程序可靠。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，模拟中国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 a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。
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| 关 键 词： | 主带彗星133P/Elst-Pizarro 光学定轨 仿真分析 精度分析 |
| 收稿时间： | 2021-03-17 |
Development of Asteroid Optical Determination Software and Data Processing Analysis |
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| Institution: | 1.State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China |
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| Abstract: | Objectives Based on the first asteroid exploration plan announced by China Space Administration on April 19, 2019, the main belt comet 133P/Elst-Pizarro (7968) is one of the possible mission targets. We aim to report integrated orbital fits for 133P through all the available ground-based optical data. Methods We developed an optical orbit determination software and compared it with the well-known OrbFit software system. The 133P/Elst-Pizarro's ground-based optical observation data from July 24, 1979 to October 28, 2019 were analyzed. In addition, we carried out a simulation orbit determination analysis aimed at 133P/Elst-Pizarro to discuss the orbit determination accuracy from ground-based optical data. Results After the fitting process, the residual distribution of 133P ground-based optical data is consistent between our results and the results from OrbFit. The measurement statistical residual root mean square (RMS) is less than 0.01″, and the internal coincidence accuracy of orbit determination is also consistent with each other. In our simulation experiments, we used 20-year simulation optical observation data measured once a month from Yunnan station and Chile station. The data were also added with Gaussian white noise which is close to the current actual observation level. The results of our simulation experiments reflected that the optical orbit determination accuracy of the asteroid was at 50 km level. Conclusions The processing results of 133P optical data suggests the reliability of our software. Further simulation analysis 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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