GPS-assisted source and receiver location estimation
First Claim
1. A mobile communication device comprising:
- a first wireless receiver adapted to determine, as it travels along a first path, a first plurality of positions of the mobile communication device using signals received from a primary positioning source;
a second wireless receiver adapted to receive signals from one or more ambient wireless sources as the mobile communication device travels along the first path;
a positioning module adapted to use the determined first plurality of positions of the mobile communication device and the received ambient wireless signals to estimate positions of the ambient sources;
said positioning module being further adapted to determine a second plurality of positions of the mobile communication device using the estimated positions of the ambient sources as the mobile communication device travels along a second path, wherein said positioning module estimates positions of the ambient sources using a time of arrival of a marker in the frequency domain carried by signals transmitted by the ambient sources; and
a database operative to store the estimated positions and corresponding time references of the signals of the one or more ambient sources.
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Accused Products
Abstract
A mobile communication device includes, in part, a first wireless receiver adapted to determine, as it travels along a path, a multitude of positions of the mobile communication device using signals received from a primary positioning source, a second wireless receiver adapted to receive signals from one or more ambient wireless sources as the mobile communication device travels along the path, and a positioning module. An internal or external memory stores estimated positions and corresponding time references of the signals of the one or more ambient sources. The positioning module uses the data stored in the database to estimate the position of the mobile communication device when no primary positioning source signal is available. The positioning module optionally uses the data stored in the database to improve estimates of the position of the mobile communication device when primary positioning signal is available.
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Citations
22 Claims
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1. A mobile communication device comprising:
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a first wireless receiver adapted to determine, as it travels along a first path, a first plurality of positions of the mobile communication device using signals received from a primary positioning source; a second wireless receiver adapted to receive signals from one or more ambient wireless sources as the mobile communication device travels along the first path; a positioning module adapted to use the determined first plurality of positions of the mobile communication device and the received ambient wireless signals to estimate positions of the ambient sources;
said positioning module being further adapted to determine a second plurality of positions of the mobile communication device using the estimated positions of the ambient sources as the mobile communication device travels along a second path, wherein said positioning module estimates positions of the ambient sources using a time of arrival of a marker in the frequency domain carried by signals transmitted by the ambient sources; anda database operative to store the estimated positions and corresponding time references of the signals of the one or more ambient sources. - View Dependent Claims (2, 3, 4, 5, 6, 7, 16, 17, 18)
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8. A system comprising:
an external database accessible to a plurality of communication devices and adapted to store estimated positions of a plurality of ambient sources and associated time references of signals generated by the plurality of ambient sources, said external database further adapted to receive and store updates of the estimated positions and the associated time reference of the signals as the estimates are generated, said external database being further adapted to supply estimates of the positions of the ambient sources as well as the associated time references to the plurality of communication devices in order to enable the plurality of communication devices to estimate their positions using said supplied estimates of the positions and the associated time references, wherein the estimated positions of a plurality of ambient sources are provided by the plurality of communication devices, wherein a positioning module in each of the plurality of communication devices estimates positions of the plurality of ambient sources using a time of arrival of a marker in the frequency domain carried by signals transmitted by the ambient sources. - View Dependent Claims (9, 19, 20)
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10. A method comprising:
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determining a first plurality of positions of a mobile communication device using signals received from one or more primary positioning sources as the mobile communication device travels along a first path; receiving signals from one or more ambient wireless sources as the mobile communication device travels along the first path; estimating positions of the ambient sources using the determined first plurality of positions, the received ambient wireless signals, and a time of arrival of a marker in the frequency domain carried by signals transmitted by the one or more ambient sources; estimating a second plurality of positions of the mobile communication device using the estimated positions of the ambient sources as the mobile communication device travels along a second path; and storing estimated positions and corresponding time references of the one or more ambient sources in an internal database. - View Dependent Claims (11, 12, 13, 14, 15, 21, 22)
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Specification