Cross-Band Correlator and Detector Design for Robust GNSS Multifrequency Combined Acquisition

This article proposes a cross-band (CB) correlator and detector for the multifrequency (MF) global navigation satellite system (GNSS) receiver to facilitate the development of robust acquisition in challenging environments. The CB correlator is designed with the projection and weighting operations to combine the multiple signals on different bands in an artificial reference domain. Based on the generalized likelihood ratio test (GLRT), the corresponding decision variable is derived to construct the CB detector considering the combination coefficients and detection threshold. The effectiveness of the proposed design is verified by Monte Carlo simulation and field test. The theoretical results show the improved performance of CB combinations when the signals suffer attenuations or frequency selective fading. The realistic results show the enhanced robustness of GPS and BeiDou Navigation Satellite System (BDS) CB detections in the presence of possible signal blockages and multipath interferences in the urban canyon.