METHOD AND SYSTEM FOR INTEGRATED TIMING MEASUREMENTS
First Claim
1. A method of determining the location of a mobile appliance in a communications system having a plurality of nodes comprising the steps of:
- (a) tasking a plurality of nodes to collect multiple frames of data from one or more signals transmitted by the mobile appliance;
(b) deriving time of arrival (TOA) measurement data from ones of the multiple frames of data; and
(c) determining a location estimate of the mobile appliance as a function of the derived TOA measurement data,wherein the derived TOA measurement data is non-coherently integrated across the ones of the multiple frames of data.
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Abstract
A method and system for determining the location of a mobile appliance in a communications system having a plurality of nodes. The plurality of nodes are tasked to measurement the time of arrival (TOA) of the signal transmitted by the mobile appliance in an assigned time slot across multiple frames of data. TOA measurement data may be derived from ones of the multiple frames of data where the derived TOA measurement data is non-coherently integrated across the ones of the multiple frames of data. A location estimate of the mobile appliance may then be determined as a function of the derived TOA measurement data.
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Citations
34 Claims
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1. A method of determining the location of a mobile appliance in a communications system having a plurality of nodes comprising the steps of:
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(a) tasking a plurality of nodes to collect multiple frames of data from one or more signals transmitted by the mobile appliance; (b) deriving time of arrival (TOA) measurement data from ones of the multiple frames of data; and (c) determining a location estimate of the mobile appliance as a function of the derived TOA measurement data, wherein the derived TOA measurement data is non-coherently integrated across the ones of the multiple frames of data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of determining the location of a mobile appliance in a communications system having a plurality of nodes comprising the steps of:
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(a) collecting multiple frames of signal data transmitted by the mobile appliance; (b) determining time of arrival (TOA) measurements for ones of the multiple frames using an ambiguity function; (c) determining a TOA quality metric for the ones of the multiple frames; and (d) determining a location of the mobile appliance as a function of the determined TOA measurements and TOA quality metric, wherein the TOA quality metric is used to filter or weight one or more of the determined TOA measurements. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of determining the location of a mobile appliance comprising the steps of:
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(a) collecting multiple time slots of signal data transmitted by the mobile appliance; (b) determining time of arrival (TOA) measurements for each of the collected multiple slots using an ambiguity function; (c) determining a TOA quality metric; (d) filtering TOA measurements as a function of the quality metric; (e) combining filtered TOA measurements into a composite TOA measurement as a function of a sum of corresponding ambiguity function magnitudes; and (f) determining a location estimate of the mobile appliance as a function of the composite TOA measurement. - View Dependent Claims (25, 26, 27, 28)
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29. In a communications system having a plurality of nodes, a method of determining the location of a mobile device as a function of time of arrival (TOA) measurement data derived from signals received from the device at the nodes, the improvement comprising the step of determining a non-coherently integrated TOA measurement from multiple individual TOA measurements.
- 30. In a communications system having a plurality of nodes, a method of determining the location of a mobile device as a function of time of arrival (TOA) measurement data derived from signals received from the device, the improvement comprising the step of using a non-coherently integrated TOA measurement at a particular node in the determination of the location estimate if there is insufficient individual time slot TOA measurement data from the particular node that exceeds a predetermined TOA measurement quality threshold.
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33. A method of determining the location of a mobile appliance in a communications system having a plurality of nodes comprising the steps of:
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(a) tasking one or more of the plural nodes to synchronously collect data transmitted by the mobile appliance; (b) creating a reference signal for data collected by a first node in a first time slot; (c) correlating the reference signal with data collected by a second node in the same time slot using an ambiguity function; (d) determining a quality metric as a function of a degree of correlation between the reference signal and data collected by the second node; and (e) determining a location estimate of the mobile appliance as a function of the data collected by the first and second nodes and the determined quality metric. - View Dependent Claims (34)
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Specification