Crowd sourcing based on dead reckoning

摘要

An identification is made as to when a device is at an anchor location, which can be a proximity zone along an edge of a dead zone or a location where a signal from a beacon is detected. In response to the device being at an anchor location, recording of crowd sourcing data based on dead reckoning starts. Recording crowd sourcing data based on dead reckoning includes identifying one or more signals received by a device while the device is at each of multiple positions. For each of the multiple positions, both an indication of the position determined based at least in part on dead reckoning and an indication of the one or more signals received while the device is at that position are recorded.

主权项

1. A method implemented by one or more processing units on a device, the method comprising:
identifying that the device is at an anchor location; in response to the device being at the anchor location, starting recording in a data store of the device:
intermediate device positions determined by dead reckoning,observation data received at the intermediate device positions, andindications of accuracy of the intermediate device positions; sending a first portion of the observation data and first corresponding intermediate device positions to a crowd sourcing data service, wherein the first corresponding intermediate device positions have an acceptable level of accuracy; not sending a second portion of the observation data and second corresponding intermediate device positions to the crowd sourcing data service, wherein the second corresponding intermediate device positions do not have the acceptable level of accuracy; identifying an updated device position that has the acceptable level of accuracy; in response to the identifying the updated device position, using backtracking to modify at least one of the second corresponding intermediate device positions, producing a modified position; and sending the modified position and corresponding observation data to the crowd sourcing data service.