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基于MEDLL的分级搜索抗多径算法

叶锦宇 寇艳红

叶锦宇, 寇艳红. 基于MEDLL的分级搜索抗多径算法[J]. 北京航空航天大学学报, 2016, 42(6): 1228-1235. doi: 10.13700/j.bh.1001-5965.2015.0419
引用本文: 叶锦宇, 寇艳红. 基于MEDLL的分级搜索抗多径算法[J]. 北京航空航天大学学报, 2016, 42(6): 1228-1235. doi: 10.13700/j.bh.1001-5965.2015.0419
YE Jinyu, KOU Yanhong. Multipath mitigation algorithm with hierarchical search based on MEDLL[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(6): 1228-1235. doi: 10.13700/j.bh.1001-5965.2015.0419(in Chinese)
Citation: YE Jinyu, KOU Yanhong. Multipath mitigation algorithm with hierarchical search based on MEDLL[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(6): 1228-1235. doi: 10.13700/j.bh.1001-5965.2015.0419(in Chinese)

基于MEDLL的分级搜索抗多径算法

doi: 10.13700/j.bh.1001-5965.2015.0419
基金项目: 国家自然科学基金(61271197)
详细信息
    作者简介:

    叶锦宇 男,硕士研究生。主要研究方向:GNSS抗多径算法。Tel.:010-82317237 E-mail:yejinyu003@163.com;寇艳红 女,博士,副教授,硕士生导师。主要研究方向:卫星导航。Tel.:010-82317237 E-mail:kouy@buaa.edu.cn

    通讯作者:

    寇艳红,Tel.:010-82317237 E-mail:kouy@buaa.edu.cn

  • 中图分类号: TN967.1

Multipath mitigation algorithm with hierarchical search based on MEDLL

  • 摘要: 以多径估计延迟锁定环路(MEDLL)为代表的参量式基带抗多径算法以其能够同时估计直达信号和多径信号各参数而受到广泛关注,然而该类算法估计精度的提高是以计算复杂度的增加为代价的。为了在保证估计精度的同时降低资源消耗并加快搜索速度,提出了一种MEDLL最大似然(ML)估计搜索方法,将粗搜索后得到的参数估计值作为下一级搜索的先验信息,缩小搜索范围后减小搜索步进,完成逐级精细的参数估计。推导了原始MEDLL及树状分级结构的MEDLL(T-MEDLL)算法计算复杂度表达式;其中在存在一路多径信号的情况下,对于0.01 chip的多径延迟分辨率,复杂度可以降低为传统盲搜索的30%~50%。进一步基于自研的数字中频(IF)GPS信号模拟器和软件GPS接收机平台对不同多径情况下盲搜索法与分级搜索算法的参数估计精度及码伪距多径误差等性能进行了对比,验证了更低计算复杂度的T-MEDLL可以达到与传统MEDLL算法同样的跟踪精度。

     

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出版历程
  • 收稿日期:  2015-06-23
  • 网络出版日期:  2016-06-20

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