【摘要】 Galileo系统通过E6B/C信号提供精密单点定位服务和身份验证服务。2019年1月欧盟公布了Galileo系统E6B/C信号的扩频码,参考欧盟发布文件,对E6B/C信号的载波频率、调制方式、主码、二级码、数据编码方案和电文结构进行了描述。设计了E6B/C信号捕获跟踪方案,通过短时相关结合FFT的方案对天空中的Galileo卫星E6B/C信号进行捕获,并用窄带宽带功率比方法和矩方法估计E6C和E6B的载噪比。同时对当前卫星播发的E6B电文信息进行了分析,分析结果表明当前Galileo的E6B信号还未开始提供PPP服务。更多还原

【Abstract】 Galileo system provides commercial services including precise point positioning and authentication through E6 B/C signals.In January 2019, the European Union announced the spreading code of the Galileo system ′ s E6 B/C signal. This article refers to the European Union ′ s published document of the E6 B/C signal and describes the carrier frequency, modulation scheme, primary codes, secondary codes, data coding scheme, and message structure. This article introduces the scheme of acquisition and tracking of the E6 B/C signal, which acquires the E6 B/C signals in the sky through the short-time correlation and FFT scheme, then uses the narrowband-wideband power ratio method and moments method to estimate the CNR of E6 C and E6 B. At the same time, this paper analyzes the current E6 B message information that transmitted by current satellites. It shows that Galileo ′ s E6 B signal has not yet started to provide PPP services.更多还原