| 导航星座星间链路信号捕获搜索策略研究 |
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| 引用本文： | 李献斌,王跃科,陈建云.导航星座星间链路信号捕获搜索策略研究[J].宇航学报,2014,35(8):946-952. |
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| 作者姓名： | 李献斌 王跃科 陈建云 |
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| 作者单位： | 国防科学技术大学机电工程与自动化学院，长沙 410073 |
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| 基金项目： | 国家863发展计划（2012AA121804） |
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| 摘 要： | 针对导航星座星间链路信号动态范围大、捕获性能要求高之间的矛盾，利用星历信息辅助信号捕获。在此基础上，分析了信号捕获串行搜索、码并行搜索和频率并行搜索的计算代价，给出了不同信号体制和星历误差下各搜索策略对应的运算量表达式，并结合典型的应用场景进行了算例分析。分析结果表明星间信号捕获在星历误差较小时采用串行搜索策略具有最少的计算量，在星历误差较大时采用码并行搜索策略计算量最少。
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| 关 键 词： | 导航星座 星间链路 星历 信号捕获 搜索策略 |
| 收稿时间： | 2013-05-13 |
Research on the Acquisition Search Strategy of Navigation ConstellationInter Satellite Link |
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| LI Xian bin,WANG Yue ke,CHEN Jian yun.Research on the Acquisition Search Strategy of Navigation ConstellationInter Satellite Link[J].Journal of Astronautics,2014,35(8):946-952. |
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| Authors: | LI Xian bin WANG Yue ke CHEN Jian yun |
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| Institution: | College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha 410073, China |
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| Abstract: | In view of the large dynamic and fast acquisition requirement of inter satellite link (ISL) signal in navigation constellation, signal acquisition is aided with ephemeris. The computational costs of serial search, code parallel search and frequency parallel search are analyzed. Calculation expressions of the corresponding search strategies are given according to different signal systems and ephemeris errors and for typical applications of the example analysis. Results show that the serial search strategy has the least amount of calculation when the ephemeris error is small and the code parallel search strategy has the least amount of calculation when the ephemeris error is large. |
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| Keywords: | Navigation constellation Inter satellite link Ephemeris Signal acquisition Search strategy |
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