摘要
In order to improve the performance of multipath mitigation in tracking Galileo signals, a new multipath mitigation method named early-late strobe correlator （ELSC） is proposed. By applying the strobe correlator used widely in global positioning system （GPS） scenarios to Galileo E1 signals, it can be found that the strobe correlator has an undesirable level of performance when the delay of multipath signals is about 0. 5 chip. Combining several strobe correlators, the ELSC can effectively mitigate the multipath effect especially for the multipath signals with the 0. 5 chip delay. The multipath error envelopes between the strobe correlator and the ELSC are compared for Galileo E1 signals. The simulation results indicate that the ELSC performs excellently on multipath mitigation, and can be applied in both Galileo scenarios and GPS scenarios.
针对伽利略信号调制的特点,提出了一种基于滤波相关器法的多路径消除方法ELSC(early-late strobe correlator).通过对滤波相关器法应用于伽利略E1信号的跟踪情况进行分析,发现滤波相关器法不能消除延迟为0.5个码片附近的多路径信号影响.ELSC方法通过对几个滤波相关器的叠加,能有效消除0.5个码片附近的多路径信号影响.通过仿真比较了ELSC方法和滤波相关器法对于伽利略信号的多路径误差包络.结果表明ELSC方法优于传统的滤波相关器法,不仅适用于伽利略信号的跟踪,同时也适用于GPS信号的跟踪.
基金
The National Key Technology R&D Program of China during the 11th Five-Year Plan Period(No.2008BAJ11B05)
