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传统的GPS L1C/A码信号和新型L1C信号同处于L1频段(1575.42MHz),充分利用了有限的频带资源。基于此特点,针对GPS L1C/A和L1C信号联合捕获中多相关峰引起的误捕问题,提出一种新的单元相关的方法。将本地L1C/A和L1C码序列分别拆分为奇、偶两个单元信号,对单元信号与接收信号的单元相关函数进行重组,完全消除L1C/A码信号引起的9个次峰,提高主峰峰值,得到尖锐的窄相关峰。仿真结果表明,该方法得到的相关峰跨度为0.5个码片,大大提高捕获精度,且捕获灵敏度比单通道联捕提高约2d BHz,同时算法复杂度低,可应用于工程实际。
The traditional GPS L1C / A code signal and the new L1C signal are in L1 band (1575.42MHz), making full use of the limited frequency band resources. Based on this feature, a new unit-related method is proposed for the accidental catch caused by multi-correlation peaks in the joint acquisition of GPS L1C / A and L1C signals. The local L1C / A and L1C code sequences are respectively split into odd and even two unit signals, and the unit correlation functions of the unit signals and the received signals are reorganized to completely eliminate the 9 sub-peaks caused by L1C / A code signals and improve the main peak Peak, get a sharp narrow correlation peak. The simulation results show that the correlation peak span obtained by this method is 0.5 chips, which greatly improves the acquisition accuracy and increases the acquisition sensitivity by about 2d BHz compared with single-channel acquisition. At the same time, the algorithm has low complexity and can be applied to engineering practice.