GNSS接收机采样率的选择及对相关器输出的影响 -- 西北工业大学,2014,32(1):75-80
论文:2014,Vol:32,Issue(1):75-80
引用本文:
宋玉龙, 廉保旺. GNSS接收机采样率的选择及对相关器输出的影响[J]. 西北工业大学
Song Yulong, Lian Baowang. GNSS Receiver's Sampling Rate Selection and Its Impact on Correlator's Output[J]. Northwestern polytechnical university

GNSS接收机采样率的选择及对相关器输出的影响
宋玉龙, 廉保旺
西北工业大学 电子信息学院, 陕西 西安 710072
摘要:
卫星导航系统数字接收机的开发首先要考虑采样率的设计,采样率的选择对接收机的运行、跟踪精度以及基带数字处理速度有着重要影响。首先研究了外差式和低中频2种射频前端结构下输出的中频信号的形式和中频频率选取原则,接着针对这2种中频信号分别设计了实/复数信号的抗混叠带通采样率;通过仿真讨论分别得到了采样率的选取与伪码速率、相关器间隔的关系,及其对相关器输出与跟踪性能的影响;最后综合各种因素给出了采样率的选取策略。
关键词:    卫星导航系统    采样率    射频前端结构    带通采样    伪码速率    相关器间隔   
GNSS Receiver's Sampling Rate Selection and Its Impact on Correlator's Output
Song Yulong, Lian Baowang
Department of Electronics Engineering, Northwestern Polytechnical University, Xi'an, 710072, China
Abstract:
The development of the digital receiver of global navigation satellite system(GNSS) should take into account the design of the sampling rate because its selection has an important impact on the operation and tracking accuracy of the receiver and on the digital processing speed of baseband signal. This paper studies the forms and frequency selection principles of intermediate frequency(IF) signal output by heterodyne and low-IF radio frequency(RF) front-end structure. It then designs the anti-aliasing bandpass sampling rates of real/complex signals for the two forms of IF signals respectively. Finally,it presents the sampling rate selection strategy by taking various factors into account. The simulation results,given in Fig.6 through 8,and their discussion show preliminarily that sampling rate,PN code rate and correlator spacing do have impact on the output of the correlator and the tracking performance of the GNSS.
Key words:    global navigation satellite systems    sampling rate    radio frequency front-end structure    bandpass sampling    PN code rate    correlator spacing   
收稿日期: 2013-05-04     修回日期:
DOI:
基金项目: 国家自然科学基金(61301094);西北工业大学基础研究基金(NPU-FFR-JCY20130135)资助
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作者简介: 宋玉龙(1989-),西北工业大学博士研究生,主要从事GNSS数字基带接收机及软件无线电的研究。
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