软件GNSS中频信号模拟器

由于具有结构灵活、开放性强以及成本低的优势,软件GNSS(Global Navigation Satellite System)信号模拟器可成为GNSS接收机设计验证的高效平台。面向GPS/Galileo组合系统,阐述了软件GNSS中频信号模拟器的架构与实现,主要功能模块包括卫星星座仿真、接收机轨迹生成、传播通道特性仿真(包括电离层模型、对流层模型、多径模型、干扰模型)、数字中频信号生成。最后,对这一信号模拟器所产生的GNSS信号(包括GPS L1 C/A,GalileoE1 CBOC)进行了验证。

A Software Based IF GNSS Signal Simulator

Software-based GNSS signal simulator would be a highly effective platform for the efficient development of GNSS receivers,due to its flexible structure,the possibility of easy updates and modifications,and low cost.The architecture and implementation of a software-based GNSS signal simulator are described in this paper.This hybrid IF signal simulator consists of several functional modules including GPS/Galileo satellite constellation simulation,receiver trajectory generation,propagation and disturbance channel simulation(including the ionosphere and troposphere models and multi-path model etc.),and GPS/Galileo digital IF signal generation.Finally,the power spectral density(PSD) curves for the IF signals obtained through the hybrid signal simulator are given,based on which the implementation of the hybrid signal simulator is validated.