公开(公告)号：US09173183B1

公开(公告)日：2015-10-27

申请号：US13896113

申请日：2013-05-16

Applicant: Sprint Spectrum L.P.

Inventor： Amar Nath Ray ,  Warren B. Cope ,  Lyle Paczkowski

IPC: H04W4/02 ,  H04W56/00

CPC classification number: H04W56/0065

Abstract: 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.

Abstract translation: 移动设备可以从多个节点发送的无线信号获得到达时间差（TDOA）测量值。 多个节点可以包括与时间参考同步的同步节点和相对于时间参考具有时间同步误差的非同步节点。 可以基于TDOA测量来确定移动设备的估计位置。 可以基于诸如移动设备扫描具有已知位置的对象的其他数据来确定移动设备的另一估计位置。 然后可以基于这些估计位置之间的距离来确定时间同步误差。 一旦确定了时间同步错误，它可以用于纠正涉及非同步节点的后续TDOA测量。