一种提高伪码跟踪精度的主峰锁定法

考虑BOC调制信号主峰锁定的不确定性以及采用DLL环的不足与缺陷,提出了一种提高伪码跟踪精度的主峰锁定法。通过多峰去除处理达到了去除副载波的目的,从而去除副峰引发的模糊性,恢复单峰值特性;通过变采样率处理,结合NVELP伪码跟踪处理对提炼的主峰进行相位锁定。从有效性、信噪比容限角度进行仿真与评估,得出结论:主峰锁定法不但可以达到对BOC调制信号主峰提取及相位锁定的目的,而且可以正确输出导航电文信息。

A Main Peak Locked Method of Improving Code Tracking Precision

A main peak locking method for improving code tracking precision was proposed, considering the main peak uncertainty of BOC modulation signal and the inadequateness of DLL loop. The purpose of subcarrier removal was achieved by the multi-peak removal processing of this method, and the ambiguity of triggered sub-peak was removed, the characteristic of single peak was restituted. Furthermore, the phase of extracted main peak was locked by variable sampling processing and NVELP processing. In addition, from validity, SNR margin, the method was simulated and evaluated. The conclusion is that not only the purpose of main peak extracted and phase-locked is achieved, but also the navigation message is accurately outputted by this method.