LOCATION FINGERPRINTING USING MULTIPLE SENSORS

摘要

Methods, program products, and systems for using multiple sensors to determine a location fingerprint are described. A sampling device can measure RF signals detected at a train station of a transit system or a route of the transit system. The sampling device, or a location server receiving the measurements, can filter RF signal measurements using one or more readings from sensors coupled to the sampling device and that are different from RF receivers. The readings can be taken concurrently with the RF signal measurements. These readings, designated as motion cues, can include motion sensor readings, barometer readings, or magnetometer readings. Using the motion cues, the sampling device or location server can distinguish different platforms of a station of the transit system and different levels of the station, or filter out RF signal measurements that may have been inaccurate, e.g., as caused by disturbances from a train entering or leaving a station.

主权项

1. A method comprising:
obtaining, by one or more computer processors, a signal profile of a station of a transit system, the signal profile comprising a plurality of signal measurements, each of the signal measurements being taken by a sampling mobile device and corresponding to a signal source detected at the station; receiving, from one or more sensors that are different from radio frequency (RF) receivers, motion cues, the motion cues indicating a motion state of the sampling mobile device within the station, each motion cue being associated with a signal measurement in the signal profile; filtering the signal profile using the motion cues, including differentiating platforms located at the station or adjusting; and providing the filtered signal profile as input for determining a signal fingerprint of the station, the signal fingerprint usable by a user mobile device to determine a location of the user device relative to the transit system.