[1] Zhu Xuefen, Chen Xiyuan, Li Zigang,. Architecture design of GPS software receiver and implementationof its acquisition algorithm with fine frequency estimation [J]. Journal of Southeast University (English Edition), 2008, 24 (1): 38-41. [doi:10.3969/j.issn.1003-7985.2008.01.009]
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Architecture design of GPS software receiver and implementationof its acquisition algorithm with fine frequency estimation(
)
GPS软件接收机的构建及其精频捕获算法的实现
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 24
- Issue:
- 2008 1
- Page:
- 38-41
- Research Field:
- Instrument Science and Technology
- Publishing date:
- 2008-03-30
Info
- Title:
- Architecture design of GPS software receiver and implementationof its acquisition algorithm with fine frequency estimation
- GPS软件接收机的构建及其精频捕获算法的实现
- Author(s):
- Zhu Xuefen; Chen Xiyuan; Li Zigang
- School of Instrument Science and Engineering, Southeast University, Nanjing 210096, China
- Keywords:
- GPS software receiver; acquisition algorithm; circular correlation; fine frequency estimation
- PACS:
- U666.1
- DOI:
- 10.3969/j.issn.1003-7985.2008.01.009
- Abstract:
- The design of a global positioning system(GPS)software receiver is introduced.This design uses the concept of software radio, and it consists of the following parts:front-end, acquisition, tracking, synchronization, navigation solution and some assisting modules.In the acquisition module, the acquisition algorithm based on circular correlation is utilized.The input data and the local code are converted into the frequency domain by means of the fast Fourier transform(FFT).After performing circular correlation, the initial phase of the C/A code can be obtained and the carrier frequency can be found in 1 kHz frequency resolution, which is too coarse to use for the tracking loop.In order to improve the frequency resolution, the fine frequency estimation through a phase relationship is then achieved, by which, the frequency resolution is improved dramatically.Experiments show that the inaccuracy of the carrier frequency can be estimated within a few hertz by the fine frequency estimation method, and the fine frequency attained can be directly used for the tracking loop.
- 介绍了一种GPS软件接收机的设计方法.该设计采用软件无线电设计理念, 主要包括前端模块、捕获模块、跟踪模块、同步模块、导航解算模块以及其他辅助模块.捕获模块采用基于圆周相关的捕获算法, 通过FFT(快速傅立叶变换)分别作用于输入信号和本地码信号将运算变换到频域内处理.该算法可得到C/A码起始相位和分辨率为1 kHz的载波频率信号, 但此载波频率精细度差, 不能直接用于跟踪环路.为提高载波频率分辨率, 采用基于相位关系计算的精频估计算法.实验表明应用精频捕获算法得到的载波精频估计误差在几赫兹以内, 可直接用于后续跟踪环路.
References:
[1] Tsui James Bao-Yen.Fundamentals of global positioning system receivers:a software approach [M].New York:John Wiley & Sons, Inc, 2000:133-165.
[2] Rinder P, Bertelsen N.Design of a single frequency GPS software receiver [D].Alborg:Alborg University, 2004.
[3] Lei Dong.IF GPS signal simulator development and verification [D].Alberta:University of Calgary, 2003.
[4] Krasner N, Norman F.GPS receiver and method for processing GPS signals:US, 5884214[P].1999-03-16.
[5] Zhang Shouxin, Huang Xuede.GPS technique and applica-tion [M].Beijing:National Defence Industry Press, 2004:1-23.(in Chinese)
[6] Kaplan Elliott, Hegarty Christopher.Understanding GPS:principles and applications[M].2nd ed.London:Artech House Press, 2006:153-241.
[7] Yang Jun, Wu Qisheng.GPS principles and its Matlab simulation [M].Xi’an:Xidian University Press, 2006:105-181.(in Chinese)
[8] Zhang Yong, Lin Baojun, Xu Zhihan.Study on simulation of signal search and acquisition in GPS software receiver [J].Journal of System Simulation, 2006, 18(9):2646-2649.(in Chinese)
[9] Dai Zhijun, Liu Lintao, Xu Houze, et al.On acquisition algorithm for GPS software receiver [J].Journal of Geodesy and Geodynamics, 2006, 26(3):106-110.(in Chinese)
[10] Misra P, Enge P.Global positioning system:signals, measurements, and performance[M].2nd ed.Lincoln:Ganga-Jamuna Press, 2006:431-549.
Memo
- Memo:
-
Biographies: Zhu Xuefen(1983—), female, graduate; Chen Xiyuan(corresponding author), male, doctor, associate professor, chxiyuan@seu.edu.cn.
Foundation items: Program for New Century Excellent Talents in University(No.NCET-06-0462), Excellent Young Teacher Foundation of Southeast University(No.4022001002).
Citation: Zhu Xuefen, Chen Xiyuan, Li Zigang.Architecture design of GPS software receiver and implementation of its acquisition algorithm with fine frequency estimation[J].Journal of Southeast University(English Edition), 2008, 24(1):38-41.