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针对在交替二进制偏移载波(AltBOC)调制方式中,由于自相关函数存在多个相关峰值,会导致接收机在码同步过程中产生跟踪模糊,造成很大的跟踪误差的问题,提出了一种基于双重估计技术的AltBOC无模糊跟踪方法.该方法使用双跟踪环路结构,并采用易于硬件实现的组合伪随机扩频码和余弦信号来设计双跟踪环路.推导出了AltBOC二维相关函数,并根据相关函数得到了信号延时的估计值.仿真结果表明:该方法能够实现AltBOC的无模糊跟踪,相对于传统的AltBOC无模糊跟踪方法,该方法具有更好的抗噪声和抗多径性能.
Aiming at the problem that the receiver generates many tracking errors during the code synchronization due to the existence of multiple correlation peaks in the alternate binary offset carrier (AltBOC) modulation scheme, a problem of tracking error is proposed AltBOC ambiguous tracking method based on double estimation technique, which uses double tracking loop structure and designs dual tracking loops by combining pseudo-random spreading code and cosine signal which are easy to implement by hardware.A two-dimensional AltBOC correlation function , And estimated the signal delay based on the correlation function.The simulation results show that this method can achieve AltBOC without ambiguity tracking, compared with the traditional AltBOC without ambiguity tracking method, this method has better anti-noise and anti-multipath performance.