Repeater identification in position determination system
AssigneeQUALCOMM Incorporated
InventorSamir S. Soliman
Life of this patent
Estimating the term…
Abstract
A method of identifying whether a first signal received at a subscriber station has been relayed by a repeater. The method involves measuring at the subscriber station a time difference of arrival between the first signal and a second signal. A hyperboloid or other potential solution surface is then formed from the measured time difference of arrival. A determination is then made whether or not the first signal was relayed by a repeater based on information derived from the potential solution surface.
Claims25
A method of identifying whether a first signal received at a subscriber station has been relayed by a repeater comprising:
- measuring at the subscriber station a time difference of arrival between the first signal and a second signal;
- forming from the measured time difference of arrival a potential solution surface indicating possible positions of the subscriber station;
- and
- identifying whether or not the first signal was relayed by a repeater based on information derived from the potential solution surface.
In a synchronous position determination system, a method of identifying whether a first signal received at a subscriber station has been relayed by a repeater comprising:
- measuring at the subscriber station a time difference of arrival between the first signal and a second signal, the first signal originating from a base station having a location, and the second signal originating from a GPS satellite having a location;
- forming a hyperboloid from the measured time difference of arrival, the location of the originating base station for the first signal, and the location of the originating GPS satellite for the second signal;
- and
- identifying whether or not the first signal was relayed by a repeater based on information derived from the hyperboloid.
A memory tangibly embodying a method of identifying whether a first signal received at a subscriber station has been relayed by a repeater comprising:
- measuring at the subscriber station a time difference of arrival between the first signal and a second signal;
- forming a potential solution surface from the measured time difference of arrival;
- and
- identifying whether or not the first signal was relayed by a repeater based on information derived from the potential solution surface.
A system for identifying whether a first signal received at a subscriber station has been relayed by a repeater comprising:
- means for measuring at the subscriber station a time difference of arrival between the first signal and a second signal;
- and
- logic for (1) forming a potential solution surface from the measured time difference of arrival;
- and (2) identifying whether or not the first signal was relayed by a repeater based on information derived from the potential solution surface.
A method of identifying whether a first signal received at a subscriber station has been relayed by a repeater comprising:
- a step for measuring at the subscriber station a time difference of arrival between the first signal and a second signal;
- a step for forming a potential solution surface from the measured time difference of arrival;
- and
- a step for identifying whether or not the first signal was relayed by a repeater based on information derived from the potential solution surface.
Dependencies are inferred from the claim text.