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US 7,257,412 B2Granted
Methods and systems for location estimation
AssigneeMediatek Inc.
InventorsChao-Lin Chen, Kai-Ten Feng
Life of this patent
Estimating the term…
Abstract
Methods and systems for location estimation. Signals are received from a plurality of satellites and a plurality of base stations by a mobile station. The location of the mobile station is estimated according to TOA (Time-Of-Arrival) and TDOA (Time Difference-Of-Arrival) measurements calculated based on the signals.
Claims8
A method for location estimation of a mobile device, comprising:
- performing TOA (Time-Of-Arrival) measurements according to signals from a plurality of satellites;
- estimating a first position using an expansion method based on the TOA measurements;
- performing TDOA (Time Difference-Of-Arrival) measurements according to signals from a plurality of base stations;
- performing an AOA (Angle-Of-Arrival) measurement by a specific base station;
- estimating a second position using the expansion method based on the TDOA and AOA measurements;
- determining whether the distance between the mobile device and the specific base station is above a threshold;
- and
- incorporating the first and second positions to estimate the location of the mobile station.
5 more elements
Dependencies are inferred from the claim text.