Method for carrier-to-noise ratio estimation in GNSS receivers

A method for determining an indicator of an amount of noise comprised within a received signal of a plurality of received satellite signals received by a Global Navigation Satellite System (GNSS) receiver, the method comprising

• extracting, by the GNSS receiver, a received modulating signal from the received signal, wherein the received signal has incurred a transmission delay, wherein the received signal is indicative of a carrier signal modulated with a modulating signal, and wherein the modulating signal comprises an in-phase component and a quadrature component;
• determining, by the GNSS receiver, an estimate of the transmission delay based on an in-phase component of the received modulating signal;
• generating, by the GNSS receiver, a prompt replica of the modulating signal using the estimate of the transmission delay;
• determining, by the GNSS receiver, a prompt quadrature correlation of a quadrature component of the received modulating signal and of a quadrature component of the prompt replica;
• determining, by the GNSS receiver, the indicator of the amount of noise comprised within the received signal based on the prompt quadrature correlation;
• and
• selecting, by the GNSS receiver, a subset of the plurality of received satellite signals based at least in part on the indicator.