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复合二进制偏移载波(CBOC)信号的子载波是四电平的扩频符号,增大了接收机相关基带码的处理难度.针对此问题,本文分析了CBOC(6,1,1/11)信号的跟踪性能,并根据其子载波的特性,改进了TM61跟踪算法.该方法在跟踪的初始阶段利用BOC(1,1)进行同步,实现稳定跟踪后改用BOC(6,1)以提高跟踪精度.最后在自主研发的硬件平台上对该算法进行了验证.结果表明在保证跟踪精度的前提下,该方法有效的解决了由BOC(6,1)多峰现象引起的错锁问题,并且降低了对捕获精度的要求.
The subcarriers of the complex binary offset carrier (CBOC) signal are four-level spreading symbols, which increases the difficulty of processing the receiver-related baseband code.In this paper, we analyze the CBOC (6,1,1 / 11) Signal tracking performance, and according to the characteristics of its subcarriers, the TM61 tracking algorithm is improved. This method uses BOC (1,1) to synchronize in the initial stage of tracking, and then uses BOC (6,1) to improve tracking after stable tracking Tracking accuracy.At last, the algorithm is validated on an independently developed hardware platform.The results show that the proposed method effectively solves the problem of mis-lock caused by multi-peak BOC (6,1) under the premise of ensuring tracking accuracy, And reduce the requirements for capture accuracy.