Method and system for determining time synchronization errors in time difference of arrival (TDOA) measurements

摘要

A mobile device may obtain time difference of arrival (TDOA) measurements from wireless signals transmitted by a plurality of nodes. The plurality of nodes may include synchronized nodes that are synchronized to a time reference and an unsynchronized node that has a time synchronization error relative to the time reference. An estimated location of the mobile device can be determined based on the TDOA measurements. Another estimated location of the mobile device can be determined based on other data, such as the mobile device scanning an object having a known location. The time synchronization error can then be determined based on a distance between these estimated locations. Once the time synchronization error has been determined, it can be used to correct subsequent TDOA measurements involving the unsynchronized node.