中文摘要：

针对电离层分离效应使Galileo系统E5 AltBOC信号上下2个边带码相位不同步的问题,提出了一种基于电离层延迟估计的AltBOC联合跟踪的方法。该方法根据双频电离层延迟差估计结果调整AltBOC信号上下2个边带信号的通道时延,使2个频点信号码相位同步。通过组合上下边带各自的伪随机码,实现AltBOC信号的双边带联合跟踪。理论分析得出该算法可以有效补偿由电离层导致的AltBOC信号上下边带信号码相位分离,仿真结果表明,该方法能够有效利用AltBOC信号尖锐的自相关函数,改善了信号接收的抗多径性能,尤其是在高信噪比下的抗多径性能。

英文摘要：

The code phase of the two side lobes of Galileo E5 alternative binary offset carrier（ AltBOC） is dispersed by the ionosphere. Therefore,an ionospheric delay estimation based AltBOC union tracking method is proposed. In this method,the ionospheric delay of two side lobes is estimated based on the dual frequency measuring results which are utilized to adjust the channel delay of two side lobes,so as to synchronize the code phases of the two side lobes. By coupling the pseudorandom code of the two side lobes,the union tracking of the dual lobes AltBOC signal is realized. The theoretical analysis indicates that the method is able to effectively compensate the dispersion of the dual bands brought by the ionosphere for the AltBOC signal. The simulation result showed that the proposed method makes full use of the AltBOC sharp autocorrelation function and the performance of the multipath mitigation is improved,especially when the signal to noise ratio is high.