Patent ID: 9578459
Date: 2017-02-21
CPC Classifications: G01S,H04W

Claim:
1. A method for location determination at a mobile device comprising: determining a location of said mobile device based, at least in part, on a measurement of a round-trip time (RTT) of a message exchange with one or more stationary transponder devices; estimating a bias between a first clock maintained at said mobile device and a second clock maintained at said one or more stationary transponder devices based, at least in part, on a difference between said determined location and locations of said one or more stationary transponder devices, and a timing reference detected in one or more first signals acquired from said one or more stationary transponder devices; and computing a range to said one or more stationary transponder devices based, at least in part, on a time of flight-related measurement acquired from said one or more first signals and on said estimated bias.