Determining the geographic location of a portable electronic device
First Claim
1. A method, performed in a radio communications network, of determining the geographic location of a portable electronic device, comprising the steps of:
- transmitting a radio signal from a first network transmitter;
receiving, in the network, a measurement signal from the portable electronic device, which measurement signal comprises, for the transmitted radio signal, i) a plurality of data samples obtained in the electronic device from the transmitted signal at different time points during a measurement period during which movement of the portable electronic device occurs, the data samples are taken with a sample period controlled to target a predetermined distance between locations of measurement points at which the data samples are obtained based on a determined speed of movement of the portable electronic device during the measurement period and ii) local position data associated to each data sample obtained from a local positioning unit in the electronic device, the data samples and local position data comprising a synthetic antenna array;
determining, in the network, a direction measurement between the electronic device and the first network transmitter from the synthetic antenna array;
obtaining geographic location data for the first network transmitter;
identifying geographic location data of the portable electronic device based on the direction measurement and the geographic location data for the first network transmitter; and
wherein the predetermined distance is selected to be less than one wavelength of the transmitted radio signal.
3 Assignments
0 Petitions
Accused Products
Abstract
Determining the geographic location of a portable electronic device (100) in a radio communications network, by transmitting radio signals from a plurality of first network transmitters (200, 300, 400); receiving, in the network, a measurement signal from the portable electronic device, which measurement signal comprises, for each transmitted radio signal, a plurality of data samples obtained in the electronic device from the respective transmitted signal at different time points during a measurement period with movement of the portable electronic device (100), and local position data associated to each data sample obtained from a local positioning unit in the electronic device, so as to form a synthetic antenna array; obtaining, a direction measurement between the electronic device and the first network transmitter from the synthetic antenna array; obtaining geographic location data for the first network transmitter; and identifying geographic location data of the portable electronic device based on the direction measurement and the geographic location data for the first network transmitter.
10 Citations
18 Claims
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1. A method, performed in a radio communications network, of determining the geographic location of a portable electronic device, comprising the steps of:
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transmitting a radio signal from a first network transmitter; receiving, in the network, a measurement signal from the portable electronic device, which measurement signal comprises, for the transmitted radio signal, i) a plurality of data samples obtained in the electronic device from the transmitted signal at different time points during a measurement period during which movement of the portable electronic device occurs, the data samples are taken with a sample period controlled to target a predetermined distance between locations of measurement points at which the data samples are obtained based on a determined speed of movement of the portable electronic device during the measurement period and ii) local position data associated to each data sample obtained from a local positioning unit in the electronic device, the data samples and local position data comprising a synthetic antenna array; determining, in the network, a direction measurement between the electronic device and the first network transmitter from the synthetic antenna array; obtaining geographic location data for the first network transmitter;
identifying geographic location data of the portable electronic device based on the direction measurement and the geographic location data for the first network transmitter; andwherein the predetermined distance is selected to be less than one wavelength of the transmitted radio signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A portable electronic device, comprising:
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a signal receiving unit including an antenna configured to receive a signal from at least one remote transmitter; a local positioning unit for determining a local position of the portable electronic device; and a processor, configured to obtain a plurality of data samples from the signal at different time points during a measurement period during which arbitrary movement of the portable electronic device occurs, associate each data sample with a local position obtained from the local positioning unit, the data samples and local position data comprising a synthetic antenna array, obtain an array response of the synthetic antenna array, and identify the geographic location of the portable electronic device by processing the synthetic antenna array as a function of the array response to determine a direction measurement between the electronic device and the at least one remote transmitter and by using knowledge about the geographic location of the at least one remote transmitter, wherein the data samples are taken with a sample period controlled to target a predetermined distance between locations of measurement points at which the data samples are obtained based on a determined speed of movement of the portable electronic device during the measurement period; and wherein the predetermined distance is selected to be less than one wavelength of the signal. - View Dependent Claims (18)
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Specification