摘要
针对新一代卫星导航系统-Galileo系统,提出了一种应用数字无线电(Digital Radio)技术和直接数字综合(DirectDigital Synthesis,DDS)技术的Galileo用户接收机原理架构。详细阐述了射频前端模块设计和基带信号处理模块设计,给出了射频/中频链路的频点规划、A/D采样方法,基带处理模块的信号捕获、伪码跟踪及载波跟踪算法;并采用结构仿真对系统架构和信号的捕获与跟踪算法进行了严格的仿真验证。仿真系统实现了E5波段Galileo信号的初始捕获,并成功跟踪了200Hz/s的多普勒一次变化和1000Hz/s2的多普勒二次变化。
The paper presents a prototype design of the Galileo user receiver architecture based upon Digital Radio and Direct Digital Synthesis （DDS） techniques. After outlining a generic GNSS user receiver system architecture, we focus on the design of the RF front-end module and base-band signal processing module of the Galileo user receiver. The frequency plan, A/D sampling, and radio frequency design criteria are presented; and the spread spectrum signal acquisition and tracking algorithms are proposed in details. A very precise simulation by digital circuit structure was performed to verify the operability of the design. The simulation system realized acquisition of E5 band Galileo signals, and successfully tracked the carrier Doppler acceleration of 200Hz/s and the change of Doppler acceleration of 1000Hz/s^2.
出处
《电子测量与仪器学报》
CSCD
2007年第4期112-116,共5页
Journal of Electronic Measurement and Instrumentation
