Patent ID: 11913809
Assignee: NEXTNAV, LLC
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 21:
22. The method of claim 15, wherein the pressure pattern includes a set of isobars, and wherein determining a reference-level pressure value for the estimated position of the mobile device comprises:
selecting a first isobar of the set of isobars that passes through the coverage area of the network and that is the closest isobar to the estimated position of the mobile device;
at each location of a plurality of different locations on the first isobar inside the coverage area of the network, determining an estimated reference-level pressure at that location on the first isobar using first reference-level pressures that are generated based on one or more of the reference-level pressures determined for the reference pressure sensors from the network of reference pressure sensors;
identifying a first maximum estimated reference-level pressure and a first minimum estimated reference-level pressure from the estimated reference-level pressures;
determining if the first maximum estimated reference-level pressure and the first minimum estimated reference-level pressure are within a predefined amount of pressure; and
if the first maximum estimated reference-level pressure and the first minimum estimated reference-level pressure are within the predefined amount of pressure, determining a first mean reference-level pressure value using the estimated reference-level pressures that are at the plurality of different locations on the first isobar, and using the first mean reference-level pressure value as the reference-level pressure value for the estimated position of the mobile device.