| 一种基于TDDM调制信号的3SDA算法 |
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| 引用本文： | 刘芳.一种基于TDDM调制信号的3SDA算法[J].宇航学报,2011(9). |
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| 作者姓名： | 刘芳 |
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| 作者单位： | 沈阳理工大学装备工程学院;南京理工大学; |
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| 基金项目： | 国家自然科学基金(60802031) |
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| 摘 要： | 针对TDDM技术而引发的卫星导航信号捕获难的问题,在深入研究与分析现有方法的不足与缺陷的基础上,提出了一种3SDA算法。在3SDA算法的合路快捕阶段,可以快速搜索误差,而且可以弥补TDDM引发的漏捕现象;在正负并行精捕阶段,可以缩小数据信息反转位的判决误差;在χ-λ模糊判决阶段,通过χ系数判决、λ分块调整等处理手段,可以精确地判断数据信息反转位置。进一步从捕获精度、处理复杂度角度进行了验证与分析,从而验证了3SDA算法的有效性,不但可以合理高效地达到捕获的目的,而且可以使数据信息反转位的判决精度可达99%,相关处理效率的提高率大于90%。
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| 关 键 词： | TDDM 3SDA 捕获 模糊判决 |
3SDA Algorithm Based on TDDM Signal |
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| LIU Fang.3SDA Algorithm Based on TDDM Signal[J].Journal of Astronautics,2011(9). |
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| Authors: | LIU Fang |
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| Institution: | LIU Fang1,2 (1.School of Equipment and Engineering,Shenyang Li Gong University,Shenyang 110168,China,2.Nanjing University of Science and Technology,Nanjing 210094,China) |
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| Abstract: | In light of the difficulty of satellite navigation signal acquisition processing raised by the TDDM technique,a new 3SDA algorithm based on TDDM signal is proposed on the basis of analysis for the shortage of existing algorithms.The error is quickly searched by united-channels-based fast acquisition of 3SDA algorithm,and the phenomenon of leaked acquisition caused by TDDM is remedied.The error output of data is reduced through positive and negative parallel precise acquisition.The precise reversed position ... |
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| Keywords: | TDDM 3SDA Acquisition Illegible-judge |
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