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针对全球导航卫星系统(GNSS)所使用的二进制偏移载波(BOC)调制信号存在跟踪模糊的问题,提出了一种能够应用于多种BOC类型信号的通用无模糊跟踪方法。首先基于调制形状码向量的概念提出了BOC信号通用表示方式。然后,推导了BOC信号互相关函数的调制形状码向量表达式。最后,在BOC通用模型的基础上,基于合成相关函数思想,设计了一种通用无模糊跟踪方法。仿真结果表明,该方法可以适用于各种相位和阶数以及复合和包含复信号的BOC调制信号,得到无模糊的窄单峰相关函数。通过分析该方法的抗噪声性能和多径抑制性能,证明其相对于传统的BOC无模糊跟踪方法具有更好的抗噪声性能。
In order to solve the problem of tracking ambiguity for binary offset carrier (BOC) modulated signals used by Global Navigation Satellite System (GNSS), a general unambiguous tracking method which can be applied to many kinds of BOC signals is proposed. First, based on the concept of modulation shape code vector, a general representation of BOC signal is proposed. Then, we derive the modulation shape code vector expression of cross-correlation function of BOC signal. Finally, based on the general model of BOC, a universal fuzzy-less tracking method is designed based on the idea of synthetic correlation function. The simulation results show that this method can be applied to all kinds of phase and order, complex and BOC modulated signal containing complex signal, and get unambiguous narrow unimodal correlation function. By analyzing the anti-noise performance and multi-path rejection performance of this method, it is proved that it has better anti-noise performance than the traditional BOC fuzzy-less tracking method.