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US 2018/0003827 A1Published application
TODA-Based positioning system using terrestrial wireless signal sources
AssigneeEtherwhere Corporation
InventorsFarrokh Farrokhi, Dickson T. Wong
Life of this patent
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Abstract
A positioning system is provided in which a client device samples a transmission from any suitable terrestrial wireless source. The resulting samples are correlated with replica samples to determine a position of the client device using time-difference-of-arrival-based calculations.
Claims16
A method, comprising:
- in a first receiver, sampling a transmission from a terrestrial wireless source to provide a series of first samples;
- based upon a time of receipt for the first samples at the first receiver and a distance between the first receiver and the terrestrial wireless source, determining a time of the transmission from the wireless source;
- sampling the transmission from the terrestrial wireless source at a second receiver to provide a series of second samples;
- correlating the first samples with the second samples to determine a correlation peak;
- and
- based upon the time difference between the correlation peak and the time of transmission from the wireless source, determining a first pseudorange between second receiver and the terrestrial wireless source.
3 more elements
The method of claim 4, further comprising determining a position for the second receiver based upon the first pseudorange and the plurality of additional pseudorange.
A method, comprising:
- in a client device, sampling a transmission of a terrestrial wireless source to provide a series of first samples;
- in a sniffer device, sampling the transmission of the terrestrial wireless source to provide a series of second samples, and
- determining a pseudorange between the client device and the terrestrial wireless source using the series of first samples and the series of second samples.
A method, comprising:
- in a cloud-based system, receiving from a client device a series of first samples of a transmission from a terrestrial wireless source;
- in the cloud-based system, receiving from the terrestrial wireless a series of second samples of the transmission and a time of the transmission;
- correlating the first samples with the second samples to determine a correlation peak;
- and
- based upon the time difference between the correlation peak and the time of the transmission, determining a first pseudorange between client device and the terrestrial wireless source.
2 more elements
Dependencies are inferred from the claim text.