Galileo卫星导航系统中的BOC调制与接收技术

介绍了二进制偏移副载波(BOC)调制的原理、性能及其扩频信号相关特性。在分析E5波段Galileo导航信号的接收和捕获技术的基础上,提出了改进的数字化基带处理模型和信号捕获方法。用结构仿真对基带信号处理模型和信号捕获算法进行仿真验证。仿真系统实现了标准E5波段Galileo导航信号的发生、数字化中频接收和基带信号处理,以及信号捕获。结果表明该信号处理方法能消除BOC调制扩频信号自相关函数多峰特性导致的捕获性能下降,可显著提高伪码顺序搜索速度,并大幅缩减跟踪环路的硬件规模。

Study on BOC Modulation and Acquisition Technique for Galileo GNSS Signals

The principle,performance of binary offset carrier modulation(BOC) and the correlation characteristic of BOC-modulated DSSS(BOC-DSSS) signals were introduced in this paper.The modified digital receiver's base-band processing and signal acquisition technique were put forward based on the analysis of the receiving and acquisition of AltBOC-modulated E5 band Galileo signals.The algorithm was proposed by the simulation using digital circuit structure.The simulation system implemented the standard E5 band Galileo signal generation,digital IF and base-band processing,and acquired the target signal.The results showed that this signal processing method could avoid the performance degradation caused by the conventional BOC-DSSS signals' multi-peak autocorrelation characteristic,greatly increase the sequential code searching speed and minimize the tracking loop hardware.