Patent ID: 11960018
Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
Field: Measurement (Instruments)
Classification: CPC G | IPC G  H

Claim 10:
11. A device configured to determine position based on low Earth orbit (LEO) satellite signals, the device comprising:
a communications module configured to receive one or more low earth orbit (LEO) satellite signals, wherein the LEO satellite signals include direct quadrature phase shift keying (QPSK) signals; and
a controller, coupled to the communications module, wherein the controller is configured to
perform a Doppler frequency measurement for the quadrature phase shift keying (QPSK) signals for each downlink channel received, wherein the Doppler frequency measurement includes
filter each received downlink channel, and
performing a channel tracking operation for each filtered downlink channel, the channel tracking operation including an independent phase-lock loop to track each filtered downlink signal, wherein each phase-lock loop determines a Doppler shift measurement; and

perform a navigation filter operation to determine clock drift based on each Doppler shift measurement from each channel tracking loop; and
determine a position of the device, wherein the device determines position based on clock drift determined by the navigation filter operation and tracking data for each LEO satellite signal source.