Simulation of Code Tracking Error Variance With Early Late Dll for Galileo/GPS Bandlimited Receivers
Both, the modernized GPS and Galileo, the new European Global Navigation Satellite System (GNSS), plan to incorporate in their signal schemes the Binary Offset Carrier (BOC) modulation. This modulation provides several advantages with respect to the Binary Phase Shift Keying (BPSK) modulation. Among others, it provides a significant reduction of the code tracking error. Code tracking accuracy is an important aspect of the GPS/Galileo navigation services. Errors in the code tracking affect the pseudorange computation and thus the GNSS based position performance. To support the design of future GPS/Galileo receivers, this paper provides analytical and numerical analysis of the code tracking accuracy for GPS/Galileo signals utilizing BOC modulation as a function of key parameters like Carrier-to NOise density (C/N0), receiver bandwidth, and Early-Late correlator spacing.