基于软件无线电技术的GPS电离层闪烁仿真系统.pdf

杭州电子科技大学
硕士学位论文
基于软件无线电技术的GPS电离层闪烁仿真系统
姓名:张风国
申请学位级别:硕士
专业:无线电物理
指导教师:甄卫民
20100501
摘要
卫星导航系统的应用已经广泛渗透到各个领域,然而,各种空间环境因素都
会对导航系统产生不同程度的影响,电离层闪烁是影响接收机性能和定位精度的
一个关键性因素。
目前,开展电离层闪烁研究主要是利用专用硬件 GPS 闪烁接收机接收空间
的真实 GPS 信号,但由于真实卫星信号不可重现,这给实际研究带来许多限制。
为了深入并灵活方便地研究电离层闪烁对导航定位系统的影响效应,本文提出了
利用由软件 GPS 信号模拟器和软件 GPS 接收机组成的电离层闪烁闭环仿真系统
开展深入的电离层闪烁仿真研究的方法。
本文在国内率先研究并实现了具有模拟电离层闪烁功能的软件 GPS 信号模
拟器,此信号模拟器能够人为可控地产生符合电离层闪烁概率模型的闪烁信号,
并首次实现了具有电离层闪烁数据处理功能的软件 GPS 接收机。然后,利用上
述由软件 GPS 信号模拟器和软件 GPS 接收机组成的电离层闪烁仿真系统开展了
电离层闪烁效应分析,并得到了初步的结果。
本文完成的基于软件无线电的电离层闪烁仿真系统为深入研究电离层闪烁
对卫星导航系统的影响奠定良好基础。

关键词:电离层闪烁,闪烁指数,软件信号模拟器,软件 GPS 接收机,仿真系
统
I
GPS Ionospheric Scintillation Simulation System
Based on SDR Technology
Fengguo Zhang (Radio Physics)
Directed by Prof. Weimin Zhen
ABSTRACT
Nowadays the Global Navigation Satellite Systems (GNSS) have been widely
used in various fields. Unfortunately, the navigation systems are often affected by all
kinds of spatial environmental factors, among which ionospheric scintillation is a key
factor to influence the receiver performances and positioning accuracy.
Directly receiving GPS signals by using specific hardware GPS receiver is the
mostly used method of studying ionospheric scintillation, but raw signals can’t be
restored once more. A closed-loop Ionospheric Scintillation Simulation System, which
posed of software GPS signal simulator and software GPS receiver based on
SDR(software defined radio) technology, is constructed to study ionospheric
scintillation and its effects in detail.
Firstly, a software GPS signal simulator with ionospheric scintillation simulation
function is realized for the first time. And the controllable signal simulator can
generate GPS signals affected by scintillation, whose probability distributions are
consistent with ionospheric scintillation probability distribution models. Then, a
software GPS receiver which can extract scintillation indices in real time is also