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

Claim 8:
9. The method of claim 8, wherein if the first maximum estimated reference-level pressure and the first minimum estimated reference-level pressure are not within the predefined amount of pressure:
selecting a second isobar of the set of isobars that passes through the coverage area of the network and that is the second closest isobar to the estimated position of the mobile device;
at each location of a plurality of different locations on the second isobar inside the coverage area of the network, determining an estimated reference-level pressure at that location on the second isobar using second reference-level pressures that are generated based on one or more of the reference-level pressures determined for the reference pressure sensors of the network of reference pressure sensors;
identifying a second maximum estimated reference-level pressure and a second minimum estimated reference-level pressure from the estimated reference-level pressures at the locations on the second isobar;
determining if the second maximum estimated reference-level pressure and the second minimum estimated reference-level pressure are within the predefined amount of pressure; and
if the second maximum estimated reference-level pressure and the second minimum estimated reference-level pressure are within the predefined amount of pressure, determining a second mean reference-level pressure value using the estimated reference-level pressures that are at the plurality of different locations on the second isobar, and using the second mean reference-level pressure value as the reference-level pressure value for the estimated position of the mobile device.