Research on Unambiguous Capture Based on BOC Modulation Signals

With the development of GNSS(Global Navigation Satellite System), the frequency band of navigation signals will become more and more crowded and mutual interference will occur between the signals. To solve this problem, both the GPS modernization signal and the Galileo signal will use BOC modulation. The BOC modulation shifts the signal originally at the carrier frequency to the left and right sides, so that signals with the same carrier frequency can successfully implement spectrum separation, fully utilize the frequency band resources, and effectively solve the compatibility problem of multi-system navigation signals. However, the autocorrelation function of BOC signal has a multi-peak characteristic, which leads to the occurrence of false capture. This paper first studies the speed and accuracy of BOC in order to improve the capture of BOC modulated signals. This paper discusses and analyzes the non-ambiguous capture based on BOC signals step by step from the theoretical basis, and gives a preliminary design proposal for GNSS reception.