Method and apparatus for optimizing GNSS search with wireless wide area networks
AssigneeQUALCOMM Incorporated
InventorRayman Pon
Life of this patent
Estimating the term…
Abstract
Disclosed are a system, apparatus, and method for optimizing GNSS search. A first radio signal is received from a terrestrial base station and a coarse location of the mobile device is estimated. A first time offset of the terrestrial base station to a timing signal of a target satellite is determined for locating a position of the target satellite. A distance from the position of the target satellite to the estimated coarse location of the mobile device is determined. A GNSS search is performed based on the distance from the target satellite and the first time offset of the first radio signal from the first terrestrial base station.
Claims28
A method to reduce a GNSS search area by a mobile device, the method comprising:
- receiving a first radio signal from a first terrestrial base station;
- estimating, from the first radio signal, a coarse location of the mobile device;
- determining a first time offset of the first radio signal to a timing signal of a target satellite;
- locating a position of the target satellite;
- determining a distance from the position of the target satellite to the estimated coarse location of the mobile device;
- and
- performing a GNSS search based on the distance from the target satellite and the first time offset of the first radio signal from the first terrestrial base station.
A mobile device to reduce GNSS search area for positioning, the mobile device comprising:
- memory;
- and
- an radio transceiver for receiving radio signals;
- and
- a processor coupled to the memory and to the radio transceiver and the processor configured to:
- receive a first radio signal from a first terrestrial base station;
- estimate, from the first radio signal, a coarse location of the mobile device;
- determine a first time offset of the first radio signal to a timing signal of a target satellite;
- locate a position of the target satellite;
- determine a distance from the position of the target satellite to the estimated coarse location of the mobile device;
- and
- perform a GNSS search based on the distance from the target satellite and the first time offset of the first radio signal from the first terrestrial base station.
A machine readable non-transitory storage medium having stored therein program instructions that are executable by one or more processors, the program instructions including instructions for the one or more processors to:
- receive a first radio signal from a first terrestrial base station;
- estimate, from the first radio signal, a coarse location of the mobile device;
- determine a first time offset of the first radio signal to a timing signal of a target satellite;
- locate a position of the target satellite;
- determine a distance from the position of the target satellite to the estimated coarse location of the mobile device;
- and
- perform a GNSS search based on the distance from the target satellite and the first time offset of the first radio signal from the first terrestrial base station.
An apparatus to reduce GNSS search area by a mobile device, the apparatus comprising:
- means for receiving a first radio signal from a first terrestrial base station;
- means for estimating, from the first radio signal, a coarse location of the mobile device;
- means for determining a first time offset of the first radio signal to a timing signal of a target satellite;
- means for locating a position of the target satellite;
- means for determining a distance from the position of the target satellite to the estimated coarse location of the mobile device;
- and
- means for performing a GNSS search based on the distance from the target satellite and the first time offset of the first radio signal from the first terrestrial base station.
Dependencies are inferred from the claim text.