Binary offset carrier (BOC) modulations are widely used in the modernized satellite navigation systems. But we find an interesting phenomenon that the signal composed of different BOC modulations suffers larger phase bias than the case that all the components have the same modulation due to the nonideal group delay of the channel. This issue is more obvious in navigation satellites for the use of a narrowband filter to suppress the out‐of‐band part. The general form of analytic expression that reveals the impact of the nonideal channel on phase bias is presented and validated with simulations. Further, by simplifying the spectrums for the signals like B1 of BeiDou and E1 of Galileo navigation systems, we obtain the concise expression of phase bias and find that the bias is mainly derived from the phase difference between the subcarrier frequencies caused by the odd order terms of group delay.

中文翻译：

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非理想群时延引起的GNSS信号分量之间的相位偏差分析

二进制偏移载波（BOC）调制广泛用于现代化的卫星导航系统中。但是我们发现一个有趣的现象，即由于信道的非理想群时延，与所有分量具有相同调制的情况相比，由不同BOC调制组成的信号遭受更大的相位偏置。在使用窄带滤波器抑制带外部分的导航卫星中，此问题更加明显。呈现并揭示了非理想通道对相位偏差影响的解析表达式的一般形式，并通过仿真进行了验证。此外，通过简化北斗B1和伽利略导航系统E1等信号的频谱，