| 应用于分布式空间网络的脉冲超宽带测距技术* |
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| 作者姓名： | 于秀丽 王婧舒 史磊 |
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| 作者单位： | 北京宇航系统工程研究所 北京 100076;首都航天机械公司 北京 100076 |
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| 基金项目： | 国家自然科学基金（51505036） |
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| 摘 要： | 针对分布式空间网络中航天器间的高精度测距需求,讨论加性高斯白噪声信道下脉冲超宽带测距技术的均方根误差克拉美罗下界,分析高斯导数脉冲参数对克拉美罗下界的影响,并比较最大似然距离估计算法的性能限。通过分析星间链路的链路预算,得到脉冲超宽带测距的测距精度在航天器间距离为10km时,其测距均方根误差下限值可达毫米级。
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| 关 键 词： | 脉冲超宽带 测距 分布式空间网络 |
Using impulse radio ultra-wideband (IR-UWB) ranging technique in distributed space networks |
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| Authors: | Yu Xiuli Wang Jingshu Shi Lei |
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| Affiliation: | Beijing Institute of Astronautical Systems Engineering, Beijing 100076 , China; Capital Aerospace Engineering Machinery Company, Beijing 100076 , China |
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| Abstract: | This paper discusses using impulse radio ultra-wideband (IR-UWB) ranging technique to realize high-accuracy inter-spacecraft ranging in future distributed space networks. First, it gives the Cramér-Rao lower bound (CRLB) on root mean square error (RMSE) of IR-UWB-based ranging under inter-spacecraft channels. It also discusses the effects of pulse parameters on CRLB and gives the asymptotic optimum maximum likelihood (ML) range estimation algorithm. Second, it analyzes the IR-UWB-based inter-spacecraft link budget and illustrates its feasibility and high-accuracy ranging performance. In addition, it analyzes and summaries the technical challenges on using IR-UWB technique to future distributed space networks missions. |
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