Patent ID: 9100107
Filing Date: 2015-08-04
Classification: G01S,H04B

Abstract:
1. A Global Navigation Satellite System (GNSS) receiver tracking system, the system comprising: a carrier demodulator configured to receive a GNSS navigation signal that includes a pilot signal component and a data signal component; a correlator block coupled to the carrier demodulator, where the correlator block implements an early correlator, a prompt correlator, and a late correlator, wherein the correlator block generates prompt values by processing the pilot signal component with the prompt correlator, and generates early and late values by processing the data signal component with the early correlator and the late correlator; a carrier tracking loop coupled to the carrier demodulator and the correlator block, wherein the carrier tracking loop generates a local carrier reference signal using the prompt values generated from the pilot signal component, and wherein the carrier tracking loop outputs the local carrier reference signal to the carrier demodulator; a code tracking loop coupled to the early correlator and the late correlator, wherein the code tracking loop outputs a pilot signal local replica pseudo-code sequence to the prompt correlator and a data signal local replica pseudo-code sequence to the early correlator and the late correlator, wherein a chip rate for both the pilot signal local replica pseudo-code sequence and the data signal local replica pseudo-code sequence is adjusted by the code tracking loop as a function of the early and late values generated from the data signal; and a symbol demodulator coupled to the early correlator and the late correlator, wherein the symbol demodulator extracts navigation data from the data signal component using the early and late values.