METHOD FOR CARRIER-TO-NOISE RATIO ESTIMATION IN GNSS RECEIVERS

摘要

The present document relates to the reception of Binary Phase Shift Keying (BPSK) signals, as well as subcarrier modulated signals, such as Binary Offset Carrier (BOC) modulated signals. In particular, the present document relates to the determination of a Carrier-to-Noise ratio (or a Signal-to-Noise Ratio) of signals in a Global Navigation Satellite System (GNSS). A method (400) for determining an indicator of an amount of noise comprised within a received signal within a satellite communication network or a GNSS is described. The received signal has incurred a transmission delay, and is indicative of a carrier signal modulated with a modulating signal (101). The modulating signal (101) comprises an in-phase component and possibly a quadrature component. The method (400) comprises extracting (401) a received modulating signal from the received signal; determining (402) an estimate of the transmission delay based on the in-phase component of the modulating signal (101); generating (403) a prompt replica of the modulating signal using the estimate of the transmission delay; determining (404) a correlation, referred to as a prompt quadrature correlation, of the quadrature component of the received modulating signal and of the quadrature component of the prompt replica; and determining (405) the indicator of the amount of noise comprised within the received signal based on the prompt quadrature correlation.