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基于時頻融合的長碼直接捕獲優(yōu)化算法研究

曾芳玲,  歐陽曉鳳,  徐浩,  呂大千

曾芳玲, 歐陽曉鳳, 徐浩, 呂大千. 基于時頻融合的長碼直接捕獲優(yōu)化算法研究[J]. 電子與信息學報, 2019, 41(2): 309-316. doi: 10.11999/JEIT180119
引用本文: 曾芳玲, 歐陽曉鳳, 徐浩, 呂大千. 基于時頻融合的長碼直接捕獲優(yōu)化算法研究[J]. 電子與信息學報, 2019, 41(2): 309-316. doi: 10.11999/JEIT180119
Fangling ZENG, Xiaofeng OUYANG, Hao XU, Daqian Lü. Improved Long-code Direct Acquisition Algorithm Based on Time-frequency Fusion[J]. Journal of Electronics & Information Technology, 2019, 41(2): 309-316. doi: 10.11999/JEIT180119
Citation: Fangling ZENG, Xiaofeng OUYANG, Hao XU, Daqian Lü. Improved Long-code Direct Acquisition Algorithm Based on Time-frequency Fusion[J]. Journal of Electronics & Information Technology, 2019, 41(2): 309-316. doi: 10.11999/JEIT180119

基于時頻融合的長碼直接捕獲優(yōu)化算法研究

doi: 10.11999/JEIT180119 cstr: 32379.14.JEIT180119

  • 國防科技大學電子對抗學院 ??合肥 ??230037

基金項目: 安徽省自然科學基金(1408085MF129)
詳細信息
    作者簡介:

    曾芳玲：女，1970年生，教授，主要從事導航與時頻方面的研究

    歐陽曉鳳：女，1989年生，博士生，研究方向為衛(wèi)星導航與導航對抗

    徐浩：男，1992年生，碩士生，研究方向為導航與定位和衛(wèi)星信號捕獲

    呂大千：男，1990年生，博士生，研究方向為導航與時間頻率技術

    通訊作者:

    歐陽曉鳳　xfouyang@sina.com

  • 中圖分類號: TN967.1

Improved Long-code Direct Acquisition Algorithm Based on Time-frequency Fusion

  • Institute of Electronic Countermeasures, National University of Defense Technology, Hefei 230037, China

Funds: The Anhui Provincial Natural Science Foundation (1408085MF129)
  • 摘要:

    長碼因其碼率高、周期長的特點，是現(xiàn)有導航系統(tǒng)廣泛采用的軍用信號體制。該文針對長碼間接捕獲方法的不足，以及擴展復制重疊捕獲算法和均值捕獲算法的局限性，提出一種以優(yōu)化復雜度和搜索速度為目標的，基于擴展復制重疊捕獲(XFAST)和均值算法相融合的時頻捕獲改進方法，給出了該算法的基本原理和捕獲結果。對該算法的信噪比條件和復雜度進行了分析仿真，進一步論證了該算法應用于長碼直接捕獲的可行性和優(yōu)良性。

    Abstract:

    At present, long-code with the characteristic of high bit rate and long period is widely used in satellite navigation system as military signal. To overcome the shortcomings of the indirect acquisition method for long-code, the limitations of the extended replication overlay acquisition algorithm and the mean acquisition algorithm, an improved time-frequency capture method based on the Extended replica Folding Acquisition Search Technique (XFAST) and the mean algorithm is proposed. The feasibility of the algorithm is simulated and the performance of the algorithm is analyzed. The simulation experiment shows the superiority of the proposed algorithm.

    • HTML全文

  • 圖  1  擴展復制原理

    圖  2  擴展復制重疊捕獲過程

    圖  3  擴展復制重疊捕獲結果仿真

    圖  4  均值算法原理

    圖  5  均值捕獲過程

    圖  6  均值捕獲方法的仿真結果

    圖  7  改進算法的基本原理

    圖  8  優(yōu)化算法的粗捕獲處理過程

    圖  9  優(yōu)化算法的精捕獲過程

    圖  10  改進算法的捕獲仿真結果

    圖  11  改進算法的工作信噪比分析

    圖  12  改進算法與擴展復制重疊算法和均值算法時間復雜度對比圖

    表  1  各算法在同等參數(shù)下的捕獲結果對比

    算法參數(shù)G1T1(s)Doppler誤差(Hz)
    G2T2(s)
    XFASTM=4150.6533.02526
    55.56508.35
    均值法i=8151.018.88526
    107.25234.65
    改進算法M=4165.3327.10210
    i=853.65687.56
    下載: 導出CSV

    表  2  各算法在各自最優(yōu)參數(shù)下的比較結果

    算法參數(shù)G1T1(s)Doppler誤差(Hz)
    G2T2(s)
    XFASTM=6165.2445.40526
    45.68360.075
    均值法i=12152.148.18626
    92.651178.68
    改進算法M=4165.3327.10210
    i=853.65687.56
    下載: 導出CSV
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出版歷程
  • 收稿日期:  2018-01-29
  • 修回日期:  2018-11-20
  • 網(wǎng)絡出版日期:  2018-11-29
  • 刊出日期:  2019-02-01

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