US 12,066,551 B2
Multi-constellation, multi-frequency GNSS system for interference mitigation
Wei Yu, Torrance, CA (US); Richard G. Keegan, Irvine, CA (US); Mark P. Kaplan, Culver City, CA (US); Brian C. Goodrich, Torrance, CA (US); and David M. Li, Harbor City, CA (US)
Assigned to DEERE & COMPANY, Moline, IL (US)
Filed by Deere & Company, Moline, IL (US)
Filed on Apr. 20, 2022, as Appl. No. 17/659,976.
Claims priority of provisional application 63/363,277, filed on Apr. 20, 2022.
Claims priority of provisional application 63/268,221, filed on Feb. 18, 2022.
Prior Publication US 2023/0266475 A1, Aug. 24, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G01S 19/21 (2010.01)
CPC G01S 19/21 (2013.01) 17 Claims
OG exemplary drawing
 
1. A receiver system with interference rejection, the receiver system comprising:
an antenna for receiving an electromagnetic signal that comprises a desired GNSS signal;
a primary downconverter configured to convert the electromagnetic signal to an intermediate frequency signal;
an analog-to-digital converter configured to convert the received electromagnetic signal or the intermediate frequency signal to a digital intermediate frequency signal;
a wideband interference mitigation module coupled to an output of the primary downconverter to process or filter the digital intermediate frequency signal;
a secondary downconverter comprising a digital harmonic-resistant translator for converting the processed or filtered digital intermediate frequency signal to a processed digital baseband signal;
a selective filtering module for filtering of the processed digital baseband signal, the selective filtering module comprising a low-pass filter configured as an anti-aliasing digital filter consistent with a target receive bandwidth to suppress aliasing in digital signal processing of the processed digital baseband signal; and
a narrow band rejection filter is coupled to the selective filtering module, the narrow band rejection filter is configured to filter the digital baseband signal to reduce or mitigate electromagnetic interference, where the narrow band rejection filter is configured for adaptive control responsive to detection by the wideband interference mitigation module of certain electromagnetic interference in the received radio frequency signal, where the certain electromagnetic interference comprises narrowband interference (NBI), wideband interference (WBI), or NBI and WBI together, where the NBI comprises in-GNSS-band NBI or a continuous wave interference signal of a bandwidth that is relatively narrower than a bandwidth of the desired GNSS signal, and where the WBI comprises adjacent-GNSS-band interference or a pulse-like interference signal.