Repeater identification in position determination system
First Claim
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1. 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.
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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.
14 Citations
25 Claims
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1. A method of identifying whether a first signal received at a subscriber station has been relayed by a repeater comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. 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:
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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. - View Dependent Claims (17, 18, 19)
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20. A memory tangibly embodying a method of identifying whether a first signal received at a subscriber station has been relayed by a repeater comprising:
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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. - View Dependent Claims (21)
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22. A system for identifying whether a first signal received at a subscriber station has been relayed by a repeater comprising:
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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. - View Dependent Claims (23)
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24. A method of identifying whether a first signal received at a subscriber station has been relayed by a repeater comprising:
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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. - View Dependent Claims (25)
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Specification