Patent ID: 11940306
Assignee: nan
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 5:
6. A method of estimating the location of a wireless terminal, the method comprising:
receiving, by a data processing system, a measurement of a location-dependent trait of a radio signal as received by a wireless terminal;
receiving, by the data processing system, a sample of barometric pressure measured by the wireless terminal;
generating, by the data-processing system, a characterization of a pressure wave in the vicinity of the wireless terminal based on the sample of barometric pressure measured by the wireless terminal;
designating at least one of a plurality of possible locations of the wireless terminal as improbable based on:
whether a predetermined feature is present in the characterization of the pressure wave; and
estimating the location of the wireless terminal to be one of the plurality of possible locations of the wireless terminal not designated as improbable based on:
the measurement of the location-dependent trait of the radio signal, and
a propagation characteristic of the pressure wave, wherein the propagation characteristic of the pressure wave is its speed of propagation.