Binary Offset Carrier (BOC) signals with high subcarrier rate such as AltBOC(15,10) and cos-BOC(15,2.5) have been adopted for the next generation of Global Navigation Satellite System (GNSS) to make full use of the allocated spectrum. However, the two main lobes of the BOC signals are tremendously separated in the frequency spectrum and the group delay of the two lobes are greatly dispersed due to ionospheric dispersion. The signals will suffer extremely severe distortion caused by the group delay dispersion including waveform ripples, power losses and correlation function asymmetries. In this paper, a novel time domain sinc interpolation based ionospheric dispersion compensation method is proposed to eliminate the distortion to the BOC signals. Firstly, the time domain model of BOC signal under the dispersive ionosphere is developed. Afterwards, based on the model, the two signal main lobes are aligned by sinc interpolation so that the ionospheric dispersion effects are almost mitigated. Taking Galileo E5 AltBOC(15,10) signal as an example, the performance of the proposed method is evaluated by simulation and test. The results show that the proposed method is able to more effectively compensate the ionospheric dispersion with fewer computational loads versus existing methods.
在下一代全球卫星导航系统中使用的高速率子载波BOC信号具有两个分离的频率主瓣。电离层色散效应使这两个主瓣的群延迟发生 了较大的分离, 导致卫星导航信号发生畸变。本文提出一种基于时域sinc插值的电离层色散效应补偿方法。根据文中设计的电离层色散效 应下BOC信号时域模型, 该方法利用sinc插值运算实现BOC信号两个主瓣群延迟同步, 消除电离层色散对BOC信号接收的影响。以伽利略E5 AltBOC(15,10)信号为例, 本文通过仿真和实测对该方法进行了评估。结果表明该方法相比于目前存在的方法计算量更小且可以更加有效地 补偿电离层色散效应。
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Ruan, H., Zhang, L. & Long, T. Sinc interpolation based method for compensation of ionospheric dispersion effects on BOC signals with high subcarrier rate. Sci. China Inf. Sci. 59, 102311 (2016). https://doi.org/10.1007/s11432-016-5555-3
- ionospheric dispersion
- sinc interpolation
- code tracking bias
- high subcarrier rate
- sinc 插值