Indoor localization with LTE carrier phase measurements and synthetic aperture antenna array
AssigneeThe Regents of the University of California
InventorsZak Kassas, Ali Abdallah
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Abstract
A spatial approach is provided to mitigate multipath error for an indoor pedestrian localization system using broadband communication signals, such as cellular long-term evolution (LTE) carrier phase measurements. Motion of a receiver may be used to synthesize an antenna array from time-separated elements. Received data may then be combined for synthetic aperture navigation that allows for suppressing multipath error based on determination of direction-of-arrival (DOA) of the incoming communication (e.g., LTE) signals. In one embodiment, navigation observables may be determined based on determined direction of arrival.
Claims20
A method for carrier phase measurement and synthetic aperture navigation for an indoor localization system, the method comprising:
- receiving, by a device, a broadband communication signal from an antenna for a first position of the device;
- receiving, by the device, a broadband communication signal from the antenna for a second position of the device;
- processing, by the device, received broadband communication signals by performing a carrier phase measurements for each position of the device;
- determining, by the device, a direction of arrival (DOA) of received broadband communication signals relative to the antenna based on the processing and measurements for each position, wherein multipath error is suppressed based on determined (DOA) of received broadband communication signals, wherein determining direction of arrival (DOA) of received broadband communication signals includes estimating all paths from the receiver including line of sight and non-line of sight, selecting line of sight path, performing a beam forming operation to combine line of sight contributions and suppress multipath error and processing a beamformed signal to determine the navigation observable;
- and
- outputting, by the device, a navigation observable based on determined direction of arrival.
A device configured for carrier phase measurement and synthetic aperture navigation for an indoor localization system, the device comprising:
- a communications module configured to
- receive a broadband communication signal from an antenna for a first position of the device, and
- receive a broadband communication signal from the antenna for a second position of the device;
- and
- a controller coupled to the communications module, wherein the controller is configured to
- process received broadband communication signals by performing a carrier phase measurements for each position of the device;
- determine a direction of arrival (DOA) of received broadband communication signals relative to the antenna based on the processing and measurements for each position, wherein multipath error is suppressed based on determined (DOA) of received broadband communication signals, wherein determining direction of arrival (DOA) of received broadband communication signals includes estimating all paths from the receiver including line of sight and non-line of sight, selecting line of sight path, performing a beam forming operation to combine line of sight contributions and suppress multipath error and processing the beamformed signal to determine the navigation observable;
- and
- output a navigation observable based on determined direction of arrival.
Dependencies are inferred from the claim text.