| 资源三号国产星敏感器事后定姿方案设计与系统实现 |
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| 引用本文： | 谢俊峰,唐新明,莫凡,刘志龙.资源三号国产星敏感器事后定姿方案设计与系统实现[J].武汉大学学报(信息科学版),2017,42(4):434-440. |
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| 作者姓名： | 谢俊峰 唐新明 莫凡 刘志龙 |
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| 作者单位： | 1.国家测绘地理信息局卫星测绘应用中心, 北京, 101300 |
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| 基金项目： | 国家青-自然科学基金Nos. 41301525, 41571440测绘地理信息公益性行业科研专项No. 201512012基础测绘青-科技项目No.1461501900202国家测绘地理信息局青-学术带头人基金No.201607 |
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| 摘 要： | 作为绝对姿态测量精度最高的仪器，星敏感器已广泛应用在当前大多遥感卫星上，其定姿精度直接影响光学测绘遥感卫星的几何定位能力。针对资源三号卫星首次下传的国产APS原始星图数据，设计并实现了一套基于国产星图的地面事后定姿方案。该方案充分利用地面事后定姿时间充足、计算资源丰富的特点，重点对星图预处理、星表重构、星图识别、恒星相机在轨检校等关键技术进行优化和改进，实现了一套资源三号国产星敏感器事后定姿系统，并将其应用于基于国产星图的绝对姿态确定中。利用资源三号卫星下传原始星图对该系统进行全面试验验证，结果分析表明，事后定姿系统不仅可靠性高，而且定姿精度达到1.82角秒（1σ，光轴指向精度），优于星上处理2.18 角秒（1σ），为资源三号卫星原始星图业务化处理提供了技术保障。
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| 关 键 词： | 资源三号卫星 事后定姿方案 星图预处理 星表重构 星图识别 在轨检校 定姿精度 |
| 收稿时间： | 2015-08-23 |
Domestic Stellar Image Post-processing Project Design and System Implementation for ZY-3 Satellite |
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| Affiliation: | 1.Satellite Surveying and Mapping Application Center, SBSM, Beijing 101300, China2.School of Geomatics, Liaoning Technical University, Fuxin 123000, China3.Department of Geo-informatics, Information Engineering University, Zhengzhou 450000, China |
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| Abstract: | As the attitude sensor with the highest absolute accuracy, the star tracker was widely applied in the most remote sensing satellites recently, and its performance is an important element to influence geometric loacation accuracy of the remote sensing satellite image. A raw stellar image processing project is firstly designed for the domestic APS star tracker loaded on the first civilian high-resolution stereo mapping satellite-ZY-3. The raw stellar images captured by the domestic APS star tracker were downlinked to the ground for post-processing. This attitude post-processing project has taken full advantage of all observed data in a period of time and sufficient computing resource on the ground, compared to the on-orbit real-time processing. And the key technologies such as the stellar image pre-processing, guide stars selection, star identification, and on-orbit calibration of the stellar camera et.al had been improved and optimized. On this basis, the post-processing system for the APS star tracker of ZY-3 satellite was implemented and applied for the absolute attitude determination based on the raw stellar images. The real-time stellar images from the APS star tracker were downloaded for test verification. The experiment result indicates that the post-processing system based on the stellar images has the characteristics of high automation and reliability. The random pointing error of optical axis was regarded as the attitude accuracy of the APS star tracker. The post-processed attitude accuracy achieves 1.82 arc seconds(1σ), which is better than that of real-time processed 2.18 arc second(1σ). This attitude post-processing system will provide technical support for the daily operational running for the raw stellar images of ZY-3 satellite. |
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