Use of global positioning system in locating a radio transmitter
First Claim
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1. An apparatus for determining radio signal timing relationships in a radio communication network, comprising:
- an input for receiving first and second signal timing measurements of at least one radio signal transmitted in the radio communication network and for receiving clock skew information about a timing discrepancy between first and second satellite-based clock signals respectively used to make the first and second signal timing measurements;
a timing relationship determiner coupled to said input for comparing the first and second signal timing measurements to obtain signal timing difference information and for using the clock skew information to compensate for an effect of said timing discrepancy in the signal timing difference information, the signal timing difference information being adjusted to account for a contribution of said timing discrepancy to the signal timing difference information; and
an output for outputting the adjusted signal timing difference information to a location determiner, the location determiner operable to determine the position of a radio transmitter in the radio communication network.
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Abstract
In locating the position of a radio transmitter in a radio communication network, signal timing measurements of a radio signal transmitted by the radio transmitter are obtained using respective satellite-based clocks. Clock discrepancy information about timing discrepancies between the satellite-based clocks is also obtained. The signal timing measurements are compared to obtain signal timing difference information, and the clock discrepancy information is used to eliminate effects of the timing discrepancies from the signal timing difference information.
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Citations
26 Claims
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1. An apparatus for determining radio signal timing relationships in a radio communication network, comprising:
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an input for receiving first and second signal timing measurements of at least one radio signal transmitted in the radio communication network and for receiving clock skew information about a timing discrepancy between first and second satellite-based clock signals respectively used to make the first and second signal timing measurements;
a timing relationship determiner coupled to said input for comparing the first and second signal timing measurements to obtain signal timing difference information and for using the clock skew information to compensate for an effect of said timing discrepancy in the signal timing difference information, the signal timing difference information being adjusted to account for a contribution of said timing discrepancy to the signal timing difference information; and
an output for outputting the adjusted signal timing difference information to a location determiner, the location determiner operable to determine the position of a radio transmitter in the radio communication network. - View Dependent Claims (2, 3, 4)
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5. A method of measuring radio signal timing relationships in a radio communication network, comprising:
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obtaining first and second signal timing measurements of at least one radio signal transmitted in the radio communication network, including using first and second satellite-based clocks respectively derived from first and second satellite timing references to make the respective first and second signal timing measurements;
providing the first and second satellite-based clocks at a first location;
obtaining, in response to the first and second satellite-based clocks provided at the first location, clock discrepancy information about a timing discrepancy between the first and second satellite-based clocks caused by a discrepancy between the first and second satellite timing references from which the first and second satellite-based clocks are derived;
comparing the first and second signal timing measurements to obtain signal timing difference information;
using the clock discrepancy information to compensate for an effect of the timing discrepancy in the signal timing difference information;
adjusting the signal timing difference information to account for a contribution of the timing discrepancy to the signal timing difference information; and
outputting the adjusted signal timing difference information to a location determiner, the location determiner operable to determine the position of a radio transmitter in the radio communication network. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An apparatus for making radio signal timing measurements in a radio communication network, comprising:
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an input for receiving a radio signal transmitted in the radio communication network;
in input for providing at a first location a plurality of satellite-based clock signals respectively derived from a plurality of satellite timing references;
a signal timing determiner coupled to said inputs for using at least one of said satellite-based clock signals to produce a signal timing measurement of the received radio signal;
a clock skew determiner coupled to said clock signal input and responsive to first and second ones of said satellite-based clock signals for providing clock skew information indicative of a timing discrepancy between the first and second satellite-based clock signals caused by a discrepancy between the respective satellite timing references from which the first and second satellite-based clock signals are derived; and
an output for outputting said signal timing measurement and said clock skew information. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification