Derek C Glass, 41161 Stone Oaks Dr, Hartsdale, NY 10530

2019029, Sep 26, 2019

Mar 18, 2019

16/356720

- Denver CO, US
Eric Derbez - Vancouver, CA
Derek Glass - Lafayette CO, US

G01S 19/21

Approaches for detecting and/or rejecting fraudulent positioning system signals at one or more positioning system receivers. The receivers may establish a time search window that may be maintained beyond a time in which a fraudulent signal is expected to move away from an authentic signal a sufficient amount so as to fall outside the time search window. Various approaches are described for updating the time signal at the receiver to maintain accuracy without acquiescing to the introduced bias of a fraudulent signal. Also, an approach for evaluation of candidate signals for consistency at one or more stationary receivers is described. Also, approaches for collective evaluation of signals provided from networked receivers are described to provide sentry receivers operative to detect and alert the presence of a fraudulent signal.

2018034, Dec 6, 2018

May 11, 2018

15/977734

- Dublin CO, US
Christopher Neil Kurby - Streamwood IL, US
Derek Glass - Longmont CO, US

G01S 19/25
G01S 19/23
G01S 19/27
H04W 56/00
H04B 17/364
H04B 7/26

Determination of one or more timing (phase) and/or frequency corrections to be made to a local time base of a receiver device to synchronize the local time base with the time of GPS or other highly accurate time base. Timing packets from one or more grandmaster devices whose time bases are substantially the same as that of GPS or the like and/or positioning system signals (e.g., GPS signals) directly from a positioning system are received and manipulated to determine the timing and/or frequency corrections. The corrected time base may be used to assist in acquiring such positioning signals to allow for higher accuracy correction and/or for downstream communication operation. The present utilities are advantageous such as when a sufficient number of channels (e.g., four) from the receiver device to positioning system satellites are unavailable to synchronize the local time base to the GPS or other accurate time base.