US 12,007,472 B2
Adaptive hybrid tracking algorithms for radio signal parameters estimations
Yang Wang, Boulder, CO (US); and Yu T. Morton, Boulder, CO (US)
Assigned to The Regents of the University of Colorado, Denver, CO (US)
Filed by The Regents of the University of Colorado, Denver, CO (US)
Filed on Jun. 21, 2023, as Appl. No. 18/338,662.
Application 18/338,662 is a continuation of application No. 17/141,450, filed on Jan. 5, 2021, granted, now 11,726,200.
Claims priority of provisional application 62/963,713, filed on Jan. 21, 2020.
Prior Publication US 2023/0333245 A1, Oct. 19, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G01S 13/89 (2006.01); G01S 13/00 (2006.01); G01S 19/22 (2010.01)
CPC G01S 13/89 (2013.01) [G01S 13/003 (2013.01); G01S 19/22 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for tracking a carrier-to-noise ratio (C/N0) and a phase correction (Δϕ) of a reflected radio frequency (RF) carrier signal, comprising:
one or more processors that
receive a digital direct line-of-sight (DLOS) intermediate frequency (IF) signal of a DLOS component of an RF carrier signal transmitted by a transmitter located above the surface of the earth and a digital reflected IF signal of a reflected component of the carrier signal that is reflected from a specular point (SP) on the surface of the earth,
generate modeled reference signal parameters using the digital DLOS IF signal and known locations of one or more receiving antennas, the transmitter, and the SP,
generate a reference signal based on the modeled reference signal parameters and feedback of a previously estimated Δϕ,
correlate the reference signal with the digital reflected IF signal to produce in-phase (I) and quadrature-phase (Q) correlation results, and
calculate an estimated C/N0 and an estimated Δϕ for the digital reflected IF signal from the correlation results.