Low Complexity Carrier-to-Noise Ratio Estimators for GNSS Digital Receivers

摘要: In a GNSS receiver the measure of C/N0 is not only supplementary information provided to user together with PVT (position, velocity, time), but it also fundamental determine status tracking subsystems and control in critical environments. A classic approach estimate navigation known as narrowband-wideband power ratio method (NWPR). We investigate suitability different estimation methods, properly adapted from digital communications world where wide range literature available on problem estimating signal-to-noise (SNR) M-PSK modulations additive white Gaussian noise (AWGN). The objective here identify subset candidate algorithms for SNR estimation, previously proposed receivers. These methods are compared specific situations interest, such weak signals or high conditions obtained high-gain antennas, considering software defined radio implementations. Simulation campaigns set real GPS-L1 used test compare performance selected broad values (from 20 70 dBHz), NWPR an authoritative benchmark. conclude that number low-complexity based simple communication signal model, can be tailored comparable respect approach, complexity reduced possible improvements foreseen using tested algorithms.