Patent ID: 11726200

Abstract:
A direct line-of-sight (DLOS) radio frequency (RF) signal component and a reflected RF signal component of an RF carrier signal are received from a transmitter. The reflected component is reflected from a point on the surface of the earth. The DLOS component is converted to a digital DLOS intermediate frequency (IF) signal and the reflected component that is converted to a digital reflected IF signal. Modeled reference signal parameters are generated using the digital DLOS IF signal and known locations of the one or more antennas, the transmitter, and the point. A reference signal is generated based on the modeled reference signal parameters and feedback of a previously estimated phase correction (Δϕ). The reference signal is correlated with the digital reflected IF signal to produce in-phase and quadrature-phase correlation results. Estimated carrier-to-noise ratio (C/N0) and Δϕ values are calculated for the digital reflected IF signal from the correlation results.