Method for coherently combining pilot and data signals in a GNSS receiver and GNSS receiver

Abstract

A method for coherently combining pilot and data signals in a GNSS receiver and a GNSS receiver are disclosed for coherently combining pilot and data signals in a global navigation satellite system (GNSS) receiver to improve sensitivity and tracking performance. A pilot signal and corresponding data signal from a common GNSS source are received, and the data bits in the data signal are demodulated using the pilot as a phase reference. The demodulated bits are cancelled or re-modulated for alignment, enabling coherent combination of the pilot and data signals into a single combined signal. The system may remove constant phase offsets via a phase rotator, perform secondary code cancelling, and dynamically adjust combining gain based on estimated bit error rate. Engagement control enables or disables combining based on carrier-to-noise density ratio and signal power thresholds.

Images