Crowd sourcing with robust device position determination

摘要

A device records observation data including positions of the device. The position of the device can be determined based on a difference between the timing of receipt, from a wireless source, of repetitive data at a trusted position and the timing of receipt of the repetitive data at a new position. The difference is used to determine a distance the new position is away from the wireless source relative to the trusted position, and this distance is used to determine an identification of the new position. The position of the device can also be determined by recording inertial data even though no position of the device is known. When a trusted position of the device is subsequently identified, the inertial data is used to backtrack along a path that the device moved to identify trusted positions of the device along the path.

主权项

1. A method implemented in a device, the method comprising:
identifying a trusted position of the device; receiving repetitive data from a wireless source; determining a first timing of receipt of the repetitive data at the trusted position; determining, after the device has moved from the trusted position to a new position, a second timing of receipt of the repetitive data at the new position; determining, based on both the first timing and the second timing, a distance away from the wireless source that the new position is relative to the trusted position; determining, based on the distance away from the wireless source that the new position is relative to the trusted position, an identification of the new position; and recording observation data associating the new position with signals detected by the device at the new position.