| 微弱GPS信号精捕获算法 |
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| 引用本文： | 王勇松,赵民建.微弱GPS信号精捕获算法[J].宇航学报,2010,31(12). |
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| 作者姓名： | 王勇松 赵民建 |
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| 作者单位： | 浙江大学信电系,杭州,310027 |
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| 摘 要： | 为了解决微弱GPS信号比特/二次编码(Neumann-Hoffman码)的同步以及频偏精细估计等问题,本文提出了对相关器输出数据进行精捕获的算法。通过对相关器输出数据进行二次变频,对不同频点的信号进行比特/二次编码位置的搜索,从而实现弱信号条件下比特/NH码的同步以及频偏的精捕获。精捕获后,使用频偏补偿后的数据进行频偏的再次精细估计。经过理论推导和仿真验证,在C/N0不低于20dB/Hz时,用1299个相关器输出数据进行精捕获时就有95%以上的检测概率,说明本方法适用于微弱GPS信号条件下比特/NH码的同步和频偏精细估计问题。
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| 关 键 词： | 微弱导航信号 精捕获 比特/NH码同步 频偏精估计 |
Fine Acquisition for Weak GPS Signal |
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| WANG Yong-song,ZHAO Min-jian.Fine Acquisition for Weak GPS Signal[J].Journal of Astronautics,2010,31(12). |
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| Authors: | WANG Yong-song ZHAO Min-jian |
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| Institution: | WANG Yong-song,ZHAO Min-jian(Department of Information Science & Electronic Engineering,Zhejiang University,Hangzhou 310027,China) |
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| Abstract: | In order to achieve bit/NH(Nenmann-Hoffman)synchronization,second code synchronization and frequency fine acquisition,a new method named second acquisition using outputs of correlator is proposed.Outputs from correlator are down converted,and then used to perform bit/NH code synchronization.After second acquisition,frequency-compensated data is used to realize fine frequency estimation.Analysis and computer simulation show that this method could realize bit/NH code synchronization and fine frequency acquisi... |
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| Keywords: | Weak GPS signals Fine acquisition Bit/NH code synchronization Fine frequency estimation |
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