Carrier Phase Multipath Error Elimination Method for GNSS Signals Based on an APCRW Correlator

Carrier phase multipath effects are sources of error for high-precision applications of Global Navigation Satellite Systems (GNSS). In this work, we propose a correlator based on the Auxiliary Punctual Code Reference Waveform (APCRW), which is composed of an Auxiliary Code Reference Waveform (ACRW) correlator and a Punctual Reference Waveform (PCRW) correlator. In the carrier tracking loop, both lossless carrier tracking and carrier multipath error estimation can be achieved by combining the ACRW and the PCRW correlators. Simulation results show that when the gate width of the code reference waveform is 1/8 chip, the carrier tracking loop based on the APCRW correlator improves the carrier phase multipath suppression capability by approximately 73.8% without any loss to the received power of the signal. In addition, the effectiveness of the algorithm is verified by experimental results using both simulator-generated and real-world satellite signals.