Patent ID: 11940294
Assignee: AT&T INTELLECTUAL PROPERTY I, L.P.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 9:
10. A device comprising:
a processing system including a processor; and
a memory that stores executable instructions that, when executed by the processing system, facilitate performance of operations, the operations comprising:
determining that a plurality of mobile devices is at ground level;
obtaining, for the plurality of mobile devices, positions and barometric pressure readings;
for each mobile device of the plurality of mobile devices:
comparing a speed of the mobile device to a speed threshold to obtain a comparison result; and
inferring a mode of transportation according to the comparison result;

determining, for the plurality of mobile devices, ground heights with respect to a common reference height to obtain determined ground heights, wherein for each mobile device of the plurality of mobile devices, the determined ground height comprises a sum of a ground elevation above the common reference height corresponding to a position of the mobile device and an offset elevation based at least in part on the mode of transportation of the mobile device;
combining, for the plurality of mobile devices, reference barometric pressures at the common reference height according to the barometric pressure readings and the determined ground heights, to obtain a combined reference pressure; and
determining a height of a target device above a local ground position of the target device in accordance with a reported barometric pressure at the target device and the combined reference pressure.